screw thread

An internal screw thread is cut with a "tap", while external screw threads are cut with a "die".

(engineering) A helical ridge formed around a cylinder, or a helical groove formed around the inner wall of a bore, used mostly on fasteners and their connection points.


centerline

centerlines (plural)
centreline (alternative)
centre line (alternative)

(engineering, trades) A line, either demarcated or imagined, representing the precise center (middle) of something (such that what lies on one side of it is precisely equal in size to what lies on the other side); the central axis represented by this line.


four-wheeled

(automotive, engineering) Having four wheels.


IFR

Integral Fast Reactor
w:Integral Fast Reactor

(nuclear physics, engineering) Initialism of Integral Fast Reactor.


IAW

Log note: 2005-09-03: Inspected IAW section 14.2.1; no violations found.

in accordance with
in accordance with#English

(engineering, business) Initialism of in accordance with.


shifter

LL-Q1860 (eng)-Flame, not lame-shifter.wav

(engineering) A control device (usually a lever or button) for shifting gears in a gearbox, or an arrangement for shifting a belt sidewise from one pulley to another.

(engineering, textiles) A wire for changing a loop from one needle to another, as in narrowing, etc.


TAN

(engineering) Initialism of total acid number, the measure of a lubricant's or crude oil's acidity. See Total acid number on Wikipedia.


parameterization

en-noun

parameterization (countable and uncountable, plural parameterizations)

parameterizations (plural)
parametrization (alternative)
parameterisation (alternative)
parametrisation (alternative)

(design, engineering) The representation of physical characteristics or properties by parameters rather than as sui generis instances; usually and especially:

(computing) Such parameterized representation in a computer model.


acre foot

(US, engineering, agriculture) A unit of measure, used for volumes of water, equal to one acre times one foot (that is, to the amount of water required to cover one acre of land to a depth of one foot), which is 43,560 cubic feet, 325,851 gallons, 1,233 cubic meters.


let-off

(engineering) A device for letting off, releasing, or giving forth, as the warp from the cylinder of a loom.


trussing

1849-1850, John Weale, Rudimentary Dictionary of Terms used in Architecture, Building, and Engineering
Beds (Trussing) were beds which packed into chests , for travelling ; and , considering the frequent removals , these must have been the most convenient kind .

(architecture, engineering) The timbers, etc., that form a truss.


polyspast

From Latin polyspaston (“hoisting-tackle with many pulleys”), from Ancient Greek πολύσπαστον (polúspaston, “compound pulley”).

der

The Bishop of Chrysopolis, his Majesty's former tutor, consecrated the foundation-stone, which was suspended from two elegant polyspasts; the Emperor himself laid it.

1849, Adalbert, Travels of His Royal Highness Prince Adalbert of Prussia, page 275:

(mechanics) A windlass with many pulleys and truckles


faller

(engineering) A part which acts by falling, such as a stamp in a fulling mill, or the device in a spinning machine to arrest motion when a thread breaks.


second moment of inertia

en-noun

second moment of inertia (plural second moments of inertia)

second moment of area
second moment of area

(engineering) A measure of a body's resistance to bending; second moment of area.

polar moment of inertia for torsional strength


second moment of area

second moment of area (plural second moments of area)

(engineering) A measure of a body's resistance to bending.


polar moment of inertia

polar moment of inertia (plural polar moments of inertia)

(engineering) A measure of a body's resistance to twisting; a measure of torsional strength.

second moment of area for resistance to bending


use case

use cases (plural)
use-case (alternative)

(engineering, generally) A usage scenario for a product, such as a piece of equipment or a tool.


penetration test

penetration test (plural penetration tests)

penetration tests (plural)
pen test (alternative clipping)

(engineering) Either a static or dynamic test of the relative density of sand, silt, etc. using a penetrometer.


waterfalling

If the film folds over on itself as a result of turbulent flow or "waterfalling," the effects can be particularly damaging.

2003, George E. Totten, D. Scott MacKenzie, Handbook of Aluminum: Physical metallurgy and processes:

If the casting is poorly designed, waterfalling will result.

2009, ASM International, Casting design and performance:

(engineering) Turbulent flow, or the damage caused by such turbulence (such as spalling).

(engineering) Applying a waterfall model of design and project management to any particular project or phase thereof (in contrast with applying an agile model).


signal-to-noise ratio

signal-to-noise ratio (plural signal-to-noise ratios)

(engineering) A figure of merit that compares the strength of a signal carrying information to the level of noise interfering with it.


closed system

(physics, physical chemistry, engineering) A physical system whose interaction with its environment is limited to particular types of transfer, so that certain quantities are conserved within the system.


flooder

LL-Q1860 (eng)-Flame, not lame-flooder.wav

This has lead ^([sic]) to the development of another type of flooder used in the eastern fields. The bottom collar on the pump is tapped for a1/4-inch street ell just below the standing valve seat, so that the standing valve will not seal the hole.

1931, Harold Coulter George, Oil Well Completion and Operation, page 202:

The flooder pipes are connected through cocks to a supply header on the aisle side of the dehumidifier.

1934, Industrial air conditioning practice, page 202:

Fresh water was added through the last bank of flooder sprays.

1958, Southern Pulp and Paper Manufacturer - Volume 20, page 58:

(engineering) A device for controlling or maintaining the flow of liquid.


acoustic emission

acoustic emission (plural acoustic emissions)

(uncountable, engineering, acoustics) A phenomenon wherein external stimuli such as mechanical loading generate physical vibrations.

Acoustic emissions are only generated when some abrupt and permanent change takes place somewhere in the material.

1990, Adrian A. Pollock, “Acoustic Emission Inspection”, in ASM Handbook, 17th edition, →ISBN, page 287:

(countable, engineering) A physical vibration caused by sudden movement within a material subjected to physical stress, often symptomatic of a defect.


educt

en-verb

educt (third-person singular simple present educts, present participle educting, simple past and past participle educted)

educts (present singular third-person)
educting (participle present)
educted (participle past)
educted (past)

Compare educe, induct, Latin eductor (“tutor”).

1878, W. J. Macquorn Rankine, Morton's Jet Condenser, John Bourne (author & editor), Examples of Steam, Air, & Gas Engines of the Most Recent Approved Types, Longmans, Green and Co., Appendix, page xlix,
In my 'Hand Book of the Steam Engine,' published in 1865, I pointed out that a feat more difficult than that of forcing the waste water out of the condenser might be performed by the educted steam, whether proceeding to the atmosphere or the condenser.

1960, Engineering Extension Series, Issue 145, Purdue University, Department of Engineering Extension, page 260,
From this tank the carbon is educted with high pressure water to the dewatering screw above the regeneration furnace.

1980, Marshall Sittig, Metal and Inorganic Waste Reclaiming Encyclopedia, Noyes Data Corporation, page 271,
To accomplish this, a preferred means is to provide an eductor 27 which has the line 28 communicating therewith and the educting fluid preferably is the vaporized hydrocarbon discharged […] .


failure rate

(sciences, engineering) The frequency with which an engineered system or component fails, expressed for example in failures per hour.


traverse

traverse (third-person singular simple present traverses, present participle traversing, simple past and past participle traversed)

traverses (present singular third-person)
traversing (participle present)
traversed (participle past)
traversed (past)

From Middle English traversen, from Old French traverser, from Latin trans (“across”) + versus (“turned”), perfect passive participle of Latin vertere (“to turn”).

the road traversed the face of the ridge as the right-of-way climbed the mountain

The last run, weary, I traversed the descents in no hurry to reach the lodge.

(engineering, skiing) To (make a cutting, an incline) across the gradients of a sloped face at safe rate.


detune

detune (third-person singular simple present detunes, present participle detuning, simple past and past participle detuned)

detunes (present singular third-person)
detuning (participle present)
detuned (participle past)
detuned (past)
de-tune (alternative)

(engineering) To alter the resonant frequency of a tuned system so that it is slightly different from a specified target frequency.


skidder

(engineering) a vehicle for pulling trees out of a forest.


wallower

At each end of the water-wheel is a vertical shaft with wallowers[…]

1847, Edward Cresy, An Encyclopaedia of Civil Engineering, Historical, Theoretical, and Practical:

(dated, engineering) A lantern wheel; a trundle.


(automotive, engineering) Alternative form of V-twin.


gashing

(engineering) The roughing operation for worm gears.


broken in

en-adj

broken in (not generally comparable, comparative more broken in, superlative broken in)

more broken in (comparative)
broken in (superlative)

The engine should be well broken in before its heavy working life begins.

(participial adjective; mechanical, engineering) (sometimes comparative) Having been broken in to seat the parts.


squirrel cage

squirrel cages (plural)
squirrel's cage (alternative)

A blower, in the shape of a drum fan (also called a "squirrel cage"), pulls the warm humid air from the room across the coils.

1996 May 19, Edward R. Lipinski, “Home Clinic: Time to Inspect Air-Conditioners”, in New York Times, retrieved 2014-02-13:

(engineering) Any other device, such as a fan or rotor, that resembles a squirrel cage in form.


pinch point

(engineering) A point in between moving and stationary parts of a machine where an individual's body part may become caught, leading to injury


inoculant

(engineering) An alloyant used to refine grains in a cast microstructure.


bilinear

bilinear isotropic hardening

Möbius transformation
Möbius transformation

(complex analysis, physics, engineering) Of or pertaining to a Möbius transformation (type of conformal map representable as the ratio of two linear functions).


trip out

en-verb

trip out (third-person singular simple present trips out, present participle tripping out, simple past and past participle tripped out)

trips out (present singular third-person)
tripping out (participle present)
tripped out (participle past)
tripped out (past)

Work carefully through high overpulls when tripping out, it may add a couple of hours to the trip, but you should not get into trouble.

1998, Steve Devereux, Practical Well Planning and Drilling Manual, →ISBN, page 15:

It is more common, for instance, for a drill string to become stuck when tripping out with the bit off bottom and the critical information pertinent to such a stuck pipe event will not be present in the traditional on-bottom depth-referenced data.

2011, Philippe Theys, Gerald Brace, Quest for Quality Data, →ISBN, page 213:

(engineering) To pull the drill stem and bit out of the hole of an oil well drill, in order to access the borehole.


micropattern

micropattern (third-person singular simple present micropatterns, present participle micropatterning, simple past and past participle micropatterned)

micropatterns (present singular third-person)
micropatterning (participle present)
micropatterned (participle past)
micropatterned (past)

These modified substrates are utilized to pattern a single cell type, or to micropattern two cell types to control their level of interaction.

1999, Sangeeta N. Bhatia, “Micropatterning cells in tissue engineering”, in Morgan & Yarmush, editors, Tissue Engineering Methods and Protocols, →ISBN, page 352:

(engineering) To control the spatial arrangement of objects at the microscopic level


anelastic

(engineering, materials science) Showing no obvious relation between stress and strain.

anelástico

showing no relation between stress and strain


Earthscape

Earthscapes (plural)
earthscape (alternative)

From Earth + -scape, modelled after landscape.

A view of the earth rising above the lunar horizon as seen from the moon or from a spacecraft.


nonunidirectional

These particles are large enough to settle from air in areas of nonunidirectional flow.

1999, Thomas A. Barber, Control of Particulate Matter Contamination in Healthcare Manufacturing, →ISBN, page 473:


exoskeletal

(engineering, of a turbine) Having rotor blades extending inwards from the inner surface of a rotating drum, rather than outwards from a central shaft.


reseat

reseat (third-person singular simple present reseats, present participle reseating, simple past and past participle reseated)

reseats (present singular third-person)
reseating (participle present)
reseated (participle past)
reseated (past)

To ensure that there are no leaks, clean the surfaces before you reseat the valve.

In 1946, several of the heavy flagstones, which form the decking of the viaduct, were replaced or reseated, and manholes were provided in the decking, to facilitate access to the inner walls.

1949 May and June, “Notes and News: First Repairs in a Century”, in Railway Magazine, page 202:

(transitive, engineering) To fit (something, especially a valve) back into its place.


turndown

(engineering) The operational range of a device.


obturator

From Latin obtūrō (“to stop, block up”).

Obturators, held down by compressed air, close the pipe giving direct access from the h.p. exhaust to the l.p. steam chest, and so prevent compound working; […].

1952 December, 'Mercury', “Modern French Locomotive Performance”, in Railway Magazine, page 803:

(engineering) A valve closure member (disk, gate, plug, etc.).


microgripper

(engineering) A microscopic device used to grasp and manipulate microscale objects safely


MPD

en-noun

MPD (countable and uncountable, plural MPDs)

(physics, engineering, space science, astronautics) Initialism of magnetoplasmadynamics.


MPD

(physics, engineering, space science, astronautics) Initialism of magnetoplasmadynamic.

MPD thruster — magnetoplasmadymanic thruster


reflow

en-verb

reflow (third-person singular simple present reflows, present participle reflowing, simple past and past participle reflowed)

reflows (present singular third-person)
reflowing (participle present)
reflowed (participle past)
reflowed (past)

Reflowing solder is a common form of rework in the manufacture of printed circuit boards: you heat up the solder and it flows where it should have flowed the first time.

(transitive, chiefly engineering) To cause to flow again, to remelt.


boost

boost (third-person singular simple present boosts, present participle boosting, simple past and past participle boosted)

boosts (present singular third-person)
boosting (participle present)
boosted (participle past)
boosted (past)

Unknown. The verb is first recorded 1815; the noun, 1825. Compare Scots boost (“to move; drive off; shoo away”), bost, boast (“to threaten; scold”), Middle English boosten, bosten (“to threaten”). Possible doublet of boast.

cog

(transitive, engineering) To amplify; to signal boost.


kilopound

(US, engineering, architecture) A non-SI unit of force equal to 1000 pounds-force.


primage

en-noun

primage (countable and uncountable, plural primages)

Of these temperatures, only one, the second, indicates primage; all others exhibit a slight superheat.

1883, Emory Edwards, Modern American Locomotive Engines: Their Design, Construction and Management, page 75:

(engineering, rare) Droplets of water suspended in steam (especially in the cylinder of a steam engine).


cap screw

A screw that has a cap which is intended to rest against the side of the outermost material being screwed together when the screw has been screwed in to its maximum extent.


TBM

Four other TBMs are currently in the ground, digging twin bore tunnels under the Chilterns and in Greater London.

2022 December 14, Paul Stephen, “HS2's Dorothy starts to dig second tunnel bore”, in RAIL, number 972, page 23:

tunnel boring machine
tunnel boring machine#English

(engineering) Initialism of tunnel boring machine.


slapdown

slapdowns (plural)
slap down (alternative)
slap-down (alternative)

(engineering) The period after the initial impact of an object with a surface through the subsequent impact of the object on that surface, as an aircraft landing or a container falling.


terraformation

terraformation (countable and uncountable, plural terraformations)


homokinetic

en-adj

homokinetic (comparative more homokinetic, superlative most homokinetic)

more homokinetic (comparative)
most homokinetic (superlative)

homokinetic joint

constant velocity
constant velocity#English

(engineering) Synonym of constant velocity.


tribotest

(engineering) A physical test of friction, lubrication, and wear.


tribometry

(physics, engineering) The measurement of friction on a surface, as carried out with a tribometer.


thrust load

en-noun

thrust load (usually uncountable, plural thrust loads)

(engineering) A force that is applied along a bearing's axis.


datum plane

(engineering) A plane which serves as a reference or base for the measurement of other quantities.


ovality

ovality (countable and uncountable, plural ovalities)

(engineering) a measurement of deviation from circularity of an oval or approximately elliptical shape.


barnacle

Uncertain, with long-debated origin. From Middle English barnakille, from earlier bernake, bernekke, most likely from Old Northern French bernaque (“barnacle”) (compare French barnache), probably from Medieval Latin barneca (“limpet”), probably from Gaulish (compare Welsh brennig, Irish bairneach), from Proto-Celtic *barinākos, from *barinā (“rock, rocky ground”) (compare Old Irish barenn (“boulder”)), from Proto-Indo-European *gʷr̥H- (“hill, mountain”) + Proto-Celtic *-ākos, from Proto-Indo-European *-kos, *-ḱos; for sense development, compare Ancient Greek λέπας (lépas, “rock”) which gave λεπάς (lepás, “limpet”).
First attestations referred to the goose, with corresponding folklore (q.v.).

der

electrical engineering
electrical engineering

(engineering, slang) In electrical engineering, a change made to a product on the manufacturing floor that was not part of the original product design.

fiksaus

engineering: change made on the manufacturing floor


demoldable

(engineering) Able to be removed from a mold.


catadrome

Ancient Greek κατάδρομος (katádromos) from κατά (katá, “down”) + δρόμος (drómos, “course, running”).

(engineering) A machine for raising or lowering heavy weights.


pulsator

Model washing-machines containing a large tank with a realistic pulsator, and a wringer with independently sprung rubber rollers.

1971, Gwen White, Antique Toys And Their Background, page 201:

(engineering, dated) That which beats or throbs in working.


point of interest

en-noun

point of interest (plural points of interest)

points of interest (plural)
POI (alternative)

(engineering) A point on an engineering drawing that has been added to make the layout of the part easier. It is usually the intersection of the tangent lines of a curve.


P.O.I.

point of interest
point of interest#English

(engineering) Initialism of point of interest.


nonrotating

(engineering, astrophysics) That does not rotate.


turboencabulator

A fanciful construction from turbo-, en-, cab, -ule, -ate, and -or.

(humorous) A fictional machine whose name is used to illustrate the perils of excessive jargon in technical writing.


brinelling

From the Brinell scale devised by Johan August Brinell, + -ing.

Few serious problems have been encountered with the six prototypes so far; one of which was foreseen, the brinelling of crankshaft bearings which spend much of their time at rest but under continuous vibration, has been overcome by ensuring that the diesel engines are run up to speed at least once per shift.

1963 April, “News and Comment: Electro-Diesel economics”, in Modern Railways, page 227:

(engineering) A material surface failure caused by contact stress that exceeds the material limit.

Brinell scale
Johan August Brinell
brinelling


datum circle

(engineering) A circle which serves as a reference or base for the measurement of other quantities.


datum surface

(engineering) A surface on a workpiece that establishes a datum.


endspan

(structural engineering) The end of the structural element which is under shear loading.


grain refiner

(engineering) An alloyant used to refine grains in a cast macrostructure


Bailey bridge

Invented by Donald Bailey, British civil servant.

■ More than 1,200 Bailey Bridges, a system developed by the British but also used by the Americans, were constructed, principally for use by the railways.

2023 June 28, Christian Wolmar, “The railway's crucial role in the Normandy invasion”, in RAIL, number 986, page 45:

(engineering, military) A portable, prefabricated truss bridge, designed for use by military engineering units.


Mabey bridge

From the name of the manufacturer, from its founder Bevil Mabey.

(engineering, military) A portable, prefabricated truss bridge, designed for use by military engineering units. A recent development from the older Bailey bridge.


MMC

MMC (countable and uncountable, plural MMCs)

Coordinate term: LMC

(engineering) Initialism of maximum material condition.


CMM

coordinate-measuring machine
w:coordinate-measuring machine

(engineering) Initialism of coordinate-measuring machine.


center mark

center marks (plural)
centre mark (alternative)

(engineering) A symbol used to mark the center of a circle or partial circle on an engineering drawing.


square wave

(calculus, engineering, signal processing) A function or waveform that alternates regularly and instantaneously between two levels.


specific thrust

specific thrust (plural specific thrusts)

(engineering) The thrust per unit weight of a vehicle or engine.


gas generator

(engineering, US) An electrical generator that runs on gasoline.


interoperation

interoperation (countable and uncountable, plural interoperations)

(engineering) The interaction and simultaneous functioning of multiple products having multiple architectures etc


blind hole

(engineering) A hole that does not extend completely through the wall; a dead end hole.


Stillson wrench

Stillson wrench (plural Stillson wrenches)

From the American inventor Daniel Chapman Stillson.


tommy bar

pin spanner

tool involving an analogous male cylindrical portion

(engineering, machining) A cylindrical iron or steel bar used as a lever.

A short bar put through the hole in a socket spanner or box spanner to provide leverage.

A set of two tommy bars is the standard tooling for the spindle nose threads of some minilathes and minimills.

A bar used to loosen or tighten some types of chucks and tool holders on machine tools such as lathes or milling machines.

crowbar

hooked bars, differentiated from tommy bars


flaskless

(engineering) Without a flask (container for holding a casting mold).


prehard

(engineering) Bar stock that has been hardened prior to delivery.


preharden

en-verb

preharden (third-person singular simple present prehardens, present participle prehardening, simple past and past participle prehardened)

prehardens (present singular third-person)
prehardening (participle present)
prehardened (participle past)
prehardened (past)

(engineering) To harden before machining.


not invented here

(business, engineering, idiomatic) Invented outside one's own organization (referring to the knee-jerk dismissal of products, technologies, etc. that come from third parties).


platin

(engineering) Alternative form of platen.


regenerator

(engineering) A type of heat exchanger where heat from the hot fluid is intermittently stored in a thermal storage medium before it is transferred to the cold fluid.


throw-out

(paper engineering) A folded paper in a publication, such as a book or a greeting card, that is intended to be unfolded for use outside the normal form factor of the publication.


TMD

en-noun

TMD (countable and uncountable, plural TMDs)

TMDs (plural)
temporomandibular joint disorder (alternative)
temporomandibular disorder (alternative)
TMJD (alternative)

tuned-mass damper
tuned-mass damper#English

(engineering, architecture) Initialism of tuned-mass damper.


dwell time

dwell time (usually uncountable, plural dwell times)

The drone has a dwell time of about six hours when operating from an in-theater airfield.

The part needs a total dwell time in the autoclave of 95 minutes.

Mr Thomas also confirmed that dwell times at New Street [Birmingham] are being examined to assess whether lengthening these would give the service more resilience, ...

2019 October, “Chase Line service to be split next May”, in Modern Railways, page 17:

The length of time that a thing or person remains in a given state.

(chiefly engineering) The period of time that a system or element of a system remains in a given state.


dry hole

(engineering) A hole drilled into the ground for oil or gas exploration which fails to yield enough oil or gas to justify the establishment of a well.


I-beam

Since it resembles a capital letter I with serifs.

(engineering) A beam with cross-section shaped like a capital letter I (with serifs top and bottom), used in construction.


crossplay

LL-Q1860 (eng)-Flame, not lame-crossplay.wav

The problem with the crossplay of plastic-based (Mylar) tape is that it's pliable; any difference in temperature or mechanical stress, induced by various transports, will distort track patterns recorded on the compliant tape.

1993, Airborne Reconnaissance, volume 16, Society of Photo-Optical Instrumentation Engineers, →ISBN, page 52:

(engineering) The ability to record data with one device and play back the data on a different, compatible device.


linish

en-verb

linish (third-person singular simple present linishes, present participle linishing, simple past and past participle linished)

linishes (present singular third-person)
linishing (participle present)
linished (participle past)
linished (past)

(transitive, engineering) To improve the flatness of a surface by means of grinding or belt-sanding techniques.


foreflow

(engineering) A channel or conduit which permits gases or liquids to foreflow.


multiflighted

en-adj

multiflighted (comparative more multiflighted, superlative most multiflighted)

more multiflighted (comparative)
most multiflighted (superlative)

(engineering, of a screw) Having more than one flight, or screw thread pattern.


eyebar

(engineering, construction) A straight bar, usually of metal, with a hole or "eye" at each end to allow it to be fixed to other components.


xyloplastic

(dated, engineering) Made from wood pulp shaped in a mould.


antiearthquake

The earthquake sent tremors down to Tokyo, 190 miles south, where high-rise buildings with the most advanced antiearthquake technology swayed for a couple of minutes.

2008 June 14, Norimitsu Onishi, “Northern Japan Quake Kills 2 and Injures Dozens”, in New York Times:

(engineering) Preventing damage from earthquakes.


yieldable

yieldable (comparative more yieldable, superlative most yieldable)

more yieldable (comparative)
most yieldable (superlative)

(engineering) Capable of yielding under pressure, rather than being bent or snapped.


hydroforming

(engineering) A cost-effective way of shaping malleable metals into lightweight, stiff pieces by means of high-pressure hydraulic fluid


overpull

en-noun

overpull (usually uncountable, plural overpulls)

/ˈəʊvə(ɹ)ˌpʊl/

/ˌəʊvə(ɹ)ˈpʊl/

(engineering) The driver for a pump that has the eccentrics above or beside the gear wheel.


abstract model

(engineering, logic, mathematics) A model that contains an abstraction or abstractions of the reality.


reactivator

(chemistry, engineering) A device that removes hydrogen sulfide from a solution.


bolt circle

(engineering) A theoretical circle passing through the center points of bolt holes positioned with equal spacing.


undercutter

The undercutter produces a rabbetlike recess on the back of the panel. This allows you to use W'-thick stock for panels without having to cut excessively deep with the panel-raising bit. An undercut panel ends up being flush with both the face and the back of a standard frame. An undercutter can be purchased as a separate bit. After raising the panels, use the undercutter to relieve that panel back as necessary to size the tongue.

2005, Bill Hylton's Frame & Panel Magic, page 63:


MTTF

mean time to failure
mean time to failure#English

(engineering) Initialism of mean time to failure.


MTBF

mean time between failures
w:mean time between failures

(engineering) Initialism of mean time between failures.


mean time to failure

(engineering) The predicted mean average time taken for a part or system to fail for the first time.


flushness

flushness (usually uncountable, plural flushnesses)

(engineering) The state of being flush: smoothly aligned, not sticking out.


underpull

LL-Q1860 (eng)-Flame, not lame-underpull.wav

Am therefore suggesting, that when you have a prospective customer, not to be so exacting, not to require a concrete foundation, neither the underpull and a vent spout leading to the roof .

1914, Joseph F. Mueller, The Operative Miller - Volume 19, page 396:

Our underpull pumping power is designed to pump wells in any direction.

1918 June, “No. 2 Geared Durnell”, in The Employer: Official Journal of the Oklahoma Employers, volume 3, number 1, page 30:

Fig. 5 —Two-well hook-up in which the Universal Pumping Unit is pumping one of the wells while the second well, equipped with an underpull jack, is being pumped through a pull-rod attached to the Universal Unit walking beam.

1943, The Composite Catalog of Oil Field and Pipe Line Equipment, page 2299:

(engineering) A driver for pumping that has the eccentrics under the gear wheel.


whisket

(engineering) A small lathe for turning wooden pins.


underhead

LL-Q1860 (eng)-Flame, not lame-underhead.wav

In preparation for reactor pressure vessel head lift, an underhead radiation survey was performed on Dec. 16 , 1982 , to determine radiation levels in the area between the top of the plenum assembly and the reactor vessel head .

1984 January-February, G. Kalman, R. Weller, “Progress in the Recovery Operations at Three Mile Island Unit 2”, in Nuclear Safety, volume 25, number 1, page 102:

With large underhead radius shown to be optimum in a given case, the judgment must be made as to whether the valve weight increase is justified in improved engine performance.

1995, Joseph Harralson, Design of Racing and High Performance Engines, page 158:

The underhead shape on valves can come in all angles which are grouped into nailhead (almost flat) and tulip.

2008, Larry Shepard, The Mopar Six-Pack Engine Handbook HP1528, page 94:

To prevent a bolt from breaking at its underhead area, an underhead radius must be provided.

2008, Tomotsugu Sakai, Bolted Joint Engineering, page 108:

(engineering) Beneath the head of a mechanical component.


Mahovos

For this purpose, on the axes of the friction wheels which sustain the Mahovos, there is a second pair of wheels somewhat smaller, and nearer the middle, which ordinarily run out of contact with anything.

1869, Frederick Augustus Porter Barnard, Machinery and Processes of the Industrial Arts, page 160:

Among other important novelties in mechanical science exhibited at the Paris Exposition of 1867, and brought to our notice by the admirable report of Dr. Barnard, of Columbia College, is one called the "mahovos," the invention of a Russian engineer, which, it is though, contains the germ of an important improvement.

1870, Harper's New Monthly Magazine, volume 40, page 933:

The Mahovo is the name given by the inventor, Captain C. Von Schubersky, of Russia, to an adaptation of the fly-wheel to accumulate a reserve of force to be used at intervals when a greater power is needed.

1884, Knight's American Mechanical Dictionary, volume 1:

(engineering, archaic) A device for saving power in stopping and starting a railroad car, by means of a heavy flywheel.


kneejoint

(engineering) A toggle joint; so called because it consists of two pieces jointed to each other end to end, making an angle like the knee when bent.


whirtle

(obsolete, engineering) A perforated steel die through which wires or tubes are drawn to form them.


trippet

(engineering) A cam, wiper, or projecting piece which strikes another piece repeatedly.


draglink

(engineering) A link connecting the cranks of two shafts.


BDC

(engineering) Initialism of bottom dead centre/bottom dead center.


wharfing

wharfing (countable and uncountable, plural wharfings)

With respect to the wharfing between the Pier and the second lock, called the Sea Lock, what is the expense of wharfing alone, the plank to wharf it, and the piles to support the planks?

(engineering) A technique of facing seawalls and embankments with planks driven as piles and secured by ties.


link motion

(engineering, dated) A valve gear consisting of two eccentrics with their rods, giving motion to a slide valve by an adjustable connecting bar (the link) in such a way that the motion of the engine can be reversed, or the cut-off varied.


gulleting

(archaic, engineering) A system of excavating by means of gullets or channels.


counterbrace

en-verb

counterbrace (third-person singular simple present counterbraces, present participle counterbracing, simple past and past participle counterbraced)

counterbraces (present singular third-person)
counterbracing (participle present)
counterbraced (participle past)
counterbraced (past)

Here a, b, and c are the great ribs whose thrusts, in the direction of the arrows, are concentrated upon the pier, d, and are counterbraced by the flying buttress, e. In other words, the section through the vaulting conoid at half its vertical height gives the triangle, a, b, c, in A, and not the square, a, b, c, d, in B in the same figure.

1890, Charles Herbert Moore, Development and Character of Gothic Architecture, Chapter 2:

(engineering, transitive) To brace in such a way that opposite strains are resisted.


hourglassing

(engineering) Physical deformation into an hourglass shape.


hourglassed

en-adj

hourglassed (comparative more hourglassed, superlative most hourglassed)

more hourglassed (comparative)
most hourglassed (superlative)

(engineering) Physically deformed into an hourglass shape.


rundle

He invented a pneumatic engine, and a peculiar instrument of use in gnomonics to solve this problem: known plane, in a known elevation, to describe such lines with the expedite turning of rundles to certain divisions, as by the shadow of the stile may shew the equal hours of the day.'

1781, William Preston, Illustrations of Masonry, page 213:

(engineering, obsolete) One of the pins or trundles of a lantern wheel.


manifolded

manifolded (comparative more manifolded, superlative most manifolded)

more manifolded (comparative)
most manifolded (superlative)

a manifolded coil

a manifolded cylinder

(engineering, not comparable) Arranged in a manifold.


Hindley's screw

(engineering) A screw cut on a solid whose sides are arcs of the periphery of a wheel into whose teeth the screw is intended to work.


backstress

(engineering) A long-range internal stress.


sway-bracing

(engineering) The horizontal bracing of a bridge, which prevents it from swaying.


cockeye

cockeyes (plural)
cock-eye (alternative)
cock eye (alternative)

From cock + eye. See cock (“to turn up”).

(engineering) The socket in the ball of a millstone, which sits on the cockhead.


momental

momental (comparative more momental, superlative most momental)

more momental (comparative)
most momental (superlative)

From moment + -al. Compare Old French momental.

momental ellipsoid

1877, Edward John Routh, An Elementary Treatise on the Dynamics of a System of Rigid Bodies:

(obsolete, engineering) Of or relating to moment or momentum.


cut and cover

(construction, engineering) A method of building a tunnel by digging a trench, constructing tunnel walls therein, and refilling the trench with earth.


CPE

en-noun

CPE (countable and uncountable, plural CPEs)

(engineering) Abbreviation of chartered professional engineer.


UNC

(engineering) Initialism of Unified Coarse (formerly an initialism of Unified National Coarse), a screw thread classification within the Unified Thread Standard.


Hooke's gearing

Hooke's gearing (plural Hooke's gearings)

(engineering) A spur gearing having teeth slanting across the face of the wheel, sometimes slanting in opposite directions from the middle.


OOS

(engineering) Initialism of out of specification.


single-acting

(engineering) Having simplicity of action; especially acting or exerting force during strokes in one direction only.


FDM

fused deposition modeling
fused deposition modeling#English

(engineering) Initialism of fused deposition modeling: a type of additive manufacturing.


drivingly

en-adv

drivingly (comparative more drivingly, superlative most drivingly)

more drivingly (comparative)
most drivingly (superlative)


scarcement

(architecture, engineering) An offset where a wall or bank of earth, etc., retreats, leaving a shelf or footing.


bambooing

en-noun

bambooing (countable and uncountable, plural bambooings)

Bambooing at low temperatures is apparently due to the formation of an unstable hydrodynamic film.

1972, Journal of the Institute of Metals, volume 100, page 81:

(engineering) A ridged surface texture, like that of bamboo, caused by manufacturing problems.


steam table

(engineering) A data table containing the properties of steam under various conditions.


U-tube

(sciences, engineering) A tube in the shape of a capital U, in certain applications having a semipermeable membrane in the middle.


Archimedes' screw

Archimedes' screw (plural Archimedes' screws)

Archimedes' screws (plural)
Archimedean screw (alternative)
Archimedes screw (alternative)

(engineering) A screwlike device invented by Greek mathematician Archimedes, ca. 200 B.C.E., which when twisted inside a cylinder, raises water from a lower level to a higher level, allowing irrigation of fields.


homodromous

(engineering) Moving in the same direction (said of a lever or pulley in which the resistance and the actuating force are both on the same side of the fulcrum or axis).


breast up

en-verb

breast up (third-person singular simple present breasts up, present participle breasting up, simple past and past participle breasted up)

breasts up (present singular third-person)
breasting up (participle present)
breasted up (participle past)
breasted up (past)

This process is continued, removing each set in succession, and removing also the roof laths as they are left free, until arriving within 9 feet of the air level, when the end is securely breasted up; and after all the stripping levels have been worked out to the same extent, the air level itself, if no longer required to be kept open, is also stripped back in the same manner.

1873, Charles D. Taylor, “Description o fthe Stream Works in Restronguet Creek Near Truro”, in Proceedings of the Institution of Mechanical Engineers, page 159:

After the room is boarded up and the timbers drilled and charged, the drift is breasted up (see plan and elevation Fig. 22).

1912, Charles E. van Barneveld, Iron Mining in Minnesota, page 53:

If at any point the old road is considered too low, instead of furrowing out, the grade should be breasted up and sufficient dirt brought up from the gutters to build retaining shoulders and the gravel deposited be- tween will raise the grade to any desired height .

1917, “Method of Resurfacing Gravel Roads in Rock County, Wisconsin”, in Engineering & Contracting, page 130:

(engineering, dated) To reinforce or stabilize; to shore up.


castable

en-adj

castable (comparative more castable, superlative most castable)

more castable (comparative)
most castable (superlative)

(engineering) Capable of being cast, as in a mould.

Able to be cast. In particular:
Capable of being cast, as in a mould.


castable

(engineering) Any substance that can be cast, as in a mould.


succula

From Latin sucula (“a winch, windlass, capstan”).

uder

(engineering) A bare axis or cylinder with staves or levers in it to turn it round, but without any drum.


danaide

From the mythical Danaides, who were condemned to fill a hole-filled vessel with water.

(engineering) A water wheel having a vertical axis and an inner and outer tapering shell, between which are vanes or floats attached usually to both shells, but sometimes only to one.


slotter

(agent noun) Someone or something that slots (that is, makes slots).

(engineering, manufacturing) A tool used to make a mortise, or to shape the sides of an aperture.

(engineering, manufacturing) Such a tool that is much like a shaper but with a smaller ram, vertically mounted.


sawtooth wave

From sawtooth + wave, named for its resemblance to the jagged teeth of a saw when graphed.

(mathematics, engineering) A function or waveform that repeatedly ramps upwards (usually linearly) and then sharply drops.

鋸齒波 /锯齿波

function or waveform that ramps upwards and then sharply drops


triangle wave

From triangle + wave, named for its triangular shape when graphed.

(mathematics, engineering) A function or waveform that alternately ramps linearly upwards and then downwards.


drop tower

(physics, engineering) A tower, containing a long evacuated tube, within which objects can be dropped experimentally.


bedplate

(engineering) The foundation framing or piece, by which the other parts are supported and held in place; the bed.


puppet valve

(engineering) A simple type of valve, consisting of one or more circular plates held down by a spring.


double-threaded

(engineering) Consisting of two threads twisted together; using two threads.

A multiple-threaded product is one having two or more threads cut beside each other (imagine two or more strings wound side by side around a pencil). Standardized products such as screws, bolts, and nuts all have single threads; a double-threaded screw has a lead equal to twice the pitch, a triple-threaded screw has a lead equal to 3 times the pitch, and so on.

2021, Richard G. Budynas and J. Keith Nisbett, “Screws, Fasteners, and the Design of Nonpermanent Joints”, in Shigley's Mechanical Engineering Design, eleventh edition in SI units, page 423:

(engineering) Having two screw threads instead of one; said of a screw in which the pitch is equal to twice the distance between the centers of adjacent threads.


pilot vehicle

(production, engineering) A prototype vehicle, initial production vehicle, lead vehicle in a new manufacturing process, first vehicle produced in a new manufactory.


ultimate tensile strength

en-noun

ultimate tensile strength (countable and uncountable, plural ultimate tensile strengths)

ultimate tensile strengths (plural)
tensile strength (alternative)

(engineering) The greatest tensile engineering stress a material can withstand before it fractures.


engineering stress

engineering stress (plural engineering stresses)

engineering stresses (plural)
nominal stress (alternative)

(engineering) In a tensile test, the ratio of the applied force to the initial cross-sectional area of the tensile specimen (ignoring the gradual decrease in area resulting from Poisson's ratio).


true strain

true strain (countable and uncountable, plural true strains)

(engineering) A dimensionless measure of object deformation; the natural logarithm of the ratio of the object's deformed length to its initial length, along some axis.


engineering strain

engineering strain (countable and uncountable, plural engineering strains)

engineering strains (plural)
nominal strain (alternative)

(engineering) A dimensionless measure of object deformation; the ratio of the object's deformed length to its initial length, along some axis.


stuffing box

stuffing boxes (plural)
stuffing-box (alternative)

Packing in the stuffing-boxes, through which the piston-rods pass at the end of the cylinder, and so arranged to keep the cylinders steam-tight, at times become loose or displaced, and in such conditions steam may pass with considerable violence out of the cylinder by way of the stuffing-box, giving an acoustic effect somewhat resembling that of an engine with cylinder-cocks open, except that the noise heard is intermittent and not practically continuous, as when the cylinder cocks are open.

1943 September and October, “The Why and the Wherefore: Locomotive Cylinder Drain Cocks”, in Railway Magazine, page 319:

The regulator in the dome is of the vertical grid type, operated by an external pull rod connected to a transverse shaft which works through a stuffing box on the second barrel plate.

1951 June, “British Railways Standard Class "5" 4-6-0 Locomotives”, in Railway Magazine, page 399:

(engineering) An assembly containing a seal, or sealing material, around a shaft.


antihunt

(engineering) Preventing hunting, or fluctuating around a central value without stabilizing.


mechatronics engineering

(engineering) The subfield of engineering concerned with designing and building electromechanical systems.


control engineering

(engineering) The subfield of engineering concerned with designing and building controllers and control systems.


holophony

wave field synthesis
wave field synthesis

(engineering) The reproduction of three-dimensional sound information in a manner analogous to the way holography reproduces light information; wave field synthesis


postyield

(engineering, materials science) Occurring after material yielding.


closed feedwater heater

closed feedwater heater (plural closed feedwater heaters)

(engineering, thermodynamics) A feedwater heater in which the two fluid streams do not mix.


open feedwater heater

open feedwater heater (plural open feedwater heaters)

(engineering, thermodynamics) A feedwater heater in which the two fluid streams mix together.


surface finish

surface finish (plural surface finishes)

If the surface finish is rougher that the polished surface of a typical smooth test specimen, the long-life fatigue strength is reduced.

2013, N. Dowling, Mechanical Behaviour of Materials, page 485:

(engineering) The quality of a surface, in terms of its roughness, microscopic pattern (lay) and macroscopic pattern (waviness).


S plane

(mathematics, engineering) The complex plane on which Laplace transforms are graphed; a mathematical domain where processes are viewed in the frequency domain rather than the time domain; used as a graphical analysis tool in engineering and physics.


guidably

(engineering) In such a way that its movement can be guided.


RUD

(explosion): Abbreviation of rapid unplanned disassembly as an initialism and an acronym

abbreviation of

Private spaceflight company SpaceX has released new pictures of its Falcon 9 rocket attempting to land on a floating platform in the Atlantic Ocean before undergoing what its chief executive, Elon Musk, euphemistically referred to as "RUD" – that’s "Rapid Unscheduled Disassembly". In other words, it blew up.

2015 January 16, Alex Hern, “This is what a 'rapid unscheduled disassembly' looks like”, in The Guardian:

“Fuel header tank pressure was low during landing burn, causing touchdown velocity to be high & RUD, but we got all the data we needed!” he said in a tweet.

2020 December 13, Eliott C. McLaughlin and Melissa Alonso, “SpaceX Falcon 9 launches and deploys satellite, days after another rocket crashed in Texas”, in CNN:

rapid unplanned disassembly
rapid unplanned disassembly#English

(acronym, initialism): (engineering, euphemistic) Synonym of rapid unplanned disassembly: An unexpected explosion or breakup


RUD

(engineering, euphemistic) To produce a RUD (rapid unplanned disassembly)


rapid unplanned disassembly

en-noun

rapid unplanned disassembly (countable and uncountable, plural rapid unplanned disassemblies)

(engineering, euphemistic) An explosion or breakup of a vehicle, usually an airplane or a rocket.


clearance space

clearance space (countable and uncountable, plural clearance spaces)

(engineering) In a steam engine, the space enclosed in one end of the cylinder, between the valve and the piston, at the beginning of a stroke, including the space caused by the piston's clearance and the space in ports, passageways, etc.


camwheel

(engineering) A wheel with one or more projections (cams) or depressions upon its periphery or upon its face, one which is set or shaped eccentrically, so that its revolutions impart a varied, reciprocating, or intermittent motion.


troll plate

(engineering) A rotary disk with spiral ribs or grooves, by which several pieces, such as the jaws of a chuck, can be brought together or spread radially.


lighter screw

(engineering, dated) A screw for adjusting the distance between the stones in a grinding mill by raising or lowering the bridgetree.


occupation bridge

occupation bridge (plural occupation bridges)

Ittig, Conrad, for building an occupation bridge, across the canal, on his farm, in the town of Frankfort

1825, Laws of the State of New York, in Relation to the Erie and Champlain Canals, page 431:

(engineering) A bridge connecting the parts of an estate or property separated by a road, railway, or canal.


double-geared

double-geared drill press

(engineering, of a machine) Driven through twofold compound gearing, to increase the force or speed.


post hanger

(engineering) A bearing for a revolving shaft, adapted to be fastened to a post.


rule joint

(engineering) A knuckle joint having shoulders that abut when the connected pieces come into line with each other, and thus permit folding in one direction only.


clack valve

The connecting pipe between a locomotive injector and the boiler, through which the water is forced into the boiler against the steam pressure within, is provided with a "clack-valve," which allows the water to pass in the inward direction only and not the outward; this is housed in a "clack-box". No question of "advantages or disadvantages" attaches to the use of a clack-box; it is a necessary part of locomotive equipment.

1946 March and April, “The Why and The Wherefore: Clack-Boxes”, in Railway Magazine, page 129:

The feed water enters the back and cool end of the preheater and passes forward to the front and hot end, after which it enters the boiler through a clack valve.

1959 September, P. Ransome-Wallis, “The British Railways Class "9" 2-10-0s”, in Trains Illustrated, page 420:

(engineering) A valve; especially one hinged at one edge, which, when raised from its seat, falls with a clacking sound.


change wheel

(engineering) One of a set of wheels of different sizes and number of teeth, that may be changed or substituted for one another in machinery, to produce a different but definite rate of angular velocity in an axis, as in cutting screws, gear, etc.


heart wheel

(engineering) A form of cam shaped like a heart, used to convert uniform rotary motion into uniform reciprocating motion.


DFI

(engineering) Initialism of developmental flight instrumentation.


segment gear

(engineering) A piece for receiving or communicating reciprocating motion from or to a cogwheel, consisting of a sector of a circular gear, or ring, having cogs on the periphery, or face.


octoid

(engineering) Being a form of gear or tooth that resembles the involute, but whose complete path of contact on the surface of a sphere is in the form of a figure eight.


check nut

(engineering) A secondary nut, screwing down upon the primary nut to secure it.


lost motion

(engineering) Synonym of lash (“play within a mechanism”).


dead plate

(engineering) A solid covering over a part of a fire grate, to prevent the entrance of air through that part.

(engineering) A fixed solid piece between two moving conveyors, to span the gap created by the roll over ends of the conveyors, allowing for the smooth transfer of products from one conveyor to another.


European Engineer

European Engineer (plural European Engineers)

European qualification for engineers granted by the European Federation of National Engineering Associations (FEANI).


aerospace engineering

(engineering) The primary branch of engineering concerned with the research, design, development, construction, testing, science, and technology of aircraft and spacecraft.

航空宇宙工学

こうくううちゅうこうがく


slidably

(engineering) So as to be movable by sliding.


rotatably

(engineering) So as to be movable by rotation.


chuckable

(engineering) Suitable for being secured in a chuck.


input arm

(engineering) The side of a lever on which force is applied.


output arm

(engineering) The side of a lever that does useful work.


upshifter

(engineering) A process, algorithm, etc. that shifts something to a higher level or frequency.


Triger process

Named after M. Triger, a French engineer.

(engineering, mining) A method of sinking through water-bearing ground, in which the shaft is lined with tubbing and provided with an airlock, work being proceeded with under air pressure.


autostability

(engineering) Ability to keep a stable poise, either by virtue of shape and proportions, or by some mechanism.


two-throw

a two-throw crank; a two-throw switch

(engineering) Capable of being thrown or cranked in two directions, usually opposite to one another.

a two-throw crankshaft

(engineering) Having two cranks set near together and opposite to one another.


chatter mark

(engineering) One of the fine undulations or ripples formed on the surface of work by a cutting tool which chatters.


split key

A split pin is also a split key, because both are used to lock or fasten pieces of machinery together.

1869, Cameron Knight, The Mechanician and Constructor for Engineers:

In a rail-stay, the combination of a bar, with rail-clamping means associated with the bar at each end, a spilt key to hold said means in engagement with the rail flange, and a fixed projection to force the leaves of the split key apart.

1907, Official Gazette of the United States Patent Office, page 1292:

I am of the opinion, upon the evidence, that, although provision was made in the bolt for the split key, as a matter of fact no split key had ever been inserted.

1914, Dominion Law Reports - Volume 14, page 703:

(engineering) A key split at one end like a split pin, for the same purpose.


ovalling

(engineering) distortion into an oval shape


ovaling

(engineering) Alternative form of ovalling.


top rake

(engineering) The angle that the front edge of the point of a tool is set back from the normal to the surface being cut.


comminutor

First, underground pipes carry used water away from the hotels and offices and into a king-size garbage grinder (comminutor), two parallel screws whose threads are knife blades big enough and strong enough to mince any solids into tiny pieces.

1988 February 12, Harold Henderson, “A Better Glass of Water”, in Chicago Reader, archived from the original on 2016-03-05:

(engineering) A type of machine that grinds up solid materials, especially in waste treatment


TP

TP (countable and uncountable, plural TPs)

(engineering) Initialism of true position.


bipetal

(engineering) Having two petal-shaped flaps, as in a bipetal check valve.


feedhole

Approximately three chambers are periodically fed with fuel by lifting the metal lid from the feedhole, charging fine coal with a small hand shovel and then replacing the lid.

1978, Albert Parker, Industrial air pollution handbook, page 564:

(engineering) A hole through or into which something is fed.


holddown

holddowns (plural)
hold-down (alternative)

(engineering) A clamping device that holds another structural element in place.


thumbnut

(engineering) A nut with a knurled rim which can be turned with thumb and forefinger.


nondimensionalization

nondimensionalization (countable and uncountable, plural nondimensionalizations)

nondimensionalizations (plural)
nondimensionalisation (alternative)

This appendix outlines the role of several key dimensional and nondimensional parameters in micro- and nanoscale fluid mechanics that come from nondimensionalization of governing equations. A key advantage of nondimensionalization is that it leads to a compact description of flow parameters (i.e., Re) and thus leads to generalization. Nondimensionalization can be a powerful tool, but it is useful only if implemented with insight into the physics of the problems.

2010, Brian J. Kirby, Micro- and Nanoscale Fluid Mechanics, Cambridge University Press, page 440:

Each computer code will have a set of reference nondimensionalizations similar to these; a specific example is given in Section 3.5.3.

2015, Russell M. Cummings, William H. Mason, Scott A. Morton, David R. McDaniel, Applied Computational Aerodynamics, Cambridge University Press, page 118:

We show how our Python interface outperforms the existing text-file-based configuration mechanism, providing features like automatic nondimensionalization of physical quantities and handling of complex parameter dependencies.

2015, Martin Bauer, Florian Schornbaum, Christian Godenschwager, Matthias Markl, Daniela Anderl, Harald Köstler, Ulrich Rüde, “A Python Extension for the Massively Parallel Multiphysics Simulation Framework waLBerla”, in arXiv:

(physics, engineering) The partial or full removal of units from an equation involving physical quantities by a suitable substitution of variables, in order, for example, to simplify and parameterize problems where measured units are involved.

Entdimensionalisierung

partial or complete removal of units from an equation


matchmark

(engineering) A mark inscribed on a component to aid alignment with the rest of an assembly.


stackup

stackup (countable and uncountable, plural stackups)

tolerance stackup

They failed to account for the tolerance stackup, which cost us a ton of scrap and weeks of lead time.

(engineering) A diagram used to calculate the effects of accumulated variation in dimensions and tolerances; the effects thus diagrammed.


coremaker

(engineering) A manufacturer of the cores used to produce the hollow parts of castings.


coremaking

(engineering) The manufacture of the cores used to produce the hollow parts of castings.


brushwheel

(engineering) One of a set of wheels that move each other without cogs or teeth, having the rubbing surfaces covered with stiff hairs, cloth, or leather instead.


hydraulic engineering

A sub-discipline of civil engineering concerned with the flow and conveyance of fluids, principally water and sewage.

هندسة هيدروليكية

sub-discipline of civil engineering concerned with water and sewage


box standard

en-adj

box standard (comparative more box standard, superlative most box standard)

more box standard (comparative)
most box standard (superlative)
box-standard (alternative)
boxed standard (alternative)

Originally in reference to the hollow-tube frames used as cases or mounting in various machines but now usually understood in reference to factory packaging and default standards.

(UK colloquial, used especially in automotive, motorcycling, engineering and technical contexts) Synonym of standard, especially with connotations of plainness and lack of modification.


planet gear

(engineering) An epicyclic gear; the middle gears in a planetary gear system, spun by the central sun gear


feedzone

(engineering) Alternative form of feed zone.


bimaterial

(engineering) Consisting of two different materials.


trimaterial

(engineering) Consisting of three different materials.


energetic event

en-noun

energetic event (plural energetic events)

(euphemistic, astronautics, engineering) An explosion.


overmold

en-verb

overmold (third-person singular simple present overmolds, present participle overmolding, simple past and past participle overmolded)

overmolds (present singular third-person)
overmolding (participle present)
overmolded (participle past)
overmolded (past)
overmould (alternative)

(engineering, transitive) To mold (part of an object) over and around another part.


overmold

overmolds (plural)
overmould (alternative)

(engineering) The part or material that is molded over and around another part.


injection molding

en-noun

injection molding (countable and uncountable, plural injection moldings)

injection moldings (plural)
injection moulding (alternative)

(engineering) A manufacturing process for producing parts by injecting material into a mold.


magnetoplasmadynamics

(physics, electromagnetism, engineering, space science, astronautics) The scientific study of the motion of plasma in the presence of a magnetic field.


straight-eight

straight-eights (plural)
straight eight (alternative)

(engineering, automotive) An engine with eight cylinders in one line or row.


rodwork

(engineering) Any assembly made from rods.


internal combustion engine
internal combustion engine#English

piston cylinders
piston cylinder#English

(automotive, engineering) An internal combustion engine with four piston cylinders arranged in two rows of two, arranged in a V-shape.


sidecast

en-verb

sidecast (third-person singular simple present sidecasts, present participle sidecasting, simple past sidecasted, past participle sidecast)

sidecasts (present singular third-person)
sidecasting (participle present)
sidecasted (past)
sidecast (participle past)
side-cast (alternative)
side cast (alternative)

LL-Q1860 (eng)-Flame, not lame-sidecast.wav

The dragline sidecasts material into a 'wet' stockpile located on-shore, immediately adjacent to the excavation.

1976, Barbers Point Harbor, Oahu: Environmental Impact Statement:

Areas where sidecasting would be done are typically steep.

1997, Juneau Access Improvements: Environmental Impact Statement:

According to the record, this piece of equipment rides on tracks (similar to a bulldozer) rather than on wheels, and it sidecasts excavated material directly into a dump truck.

2005, United States Environmental Protection Agency: Environmental Appeals Board, Environmental administrative decisions:

(engineering) To eject waste material that has been excavated or dredged to the side, rather than hauling it away.


sidecast

en-noun

sidecast (countable and uncountable, plural sidecasts)

sidecasts (plural)
side-cast (alternative)
side cast (alternative)

In areas of moderate slopes, recontouring can be accomplished by salvaging sidecast deposited during road construction.

1994, Lamefoot Mine Environmental Impact Statement, Supplement to the Kettle River Key Project Expansion:

The site does not conflict with the proposed road right-of-way, but could be indirectly impacted by sidecast or disturbance of hydrologic flow. Sidecast would impact the site by permanently disturbing habitat and/or eliminating plants.

1997, Final Environmental Impact Statement: Umpqua National Forest (N.F.), Stewart Mining Operation:

In contrast, tree growth has been found to be higher on displaced material such as berms and sidecasts compared with the harvested undisturbed soils.

2006, Rattan Lal, Encyclopedia of Soil Science - Volume 2, →ISBN, page 1380:

Removing the sidecast barrier material also could facilitate passage of rainbow trout through the reach to access spawning and rearing habitat and the portion of the spring-water fed thermal refugia that are upstream of the sidecast barrier.

2007, Klamath Hydroelectric Project, FERC Project No. 2080-027, Oregon and California:

(engineering) Debris left next to a construction site from sidecasting.

Accordingly, alternative dredge plants were analyzed, including pipeline, hopper, and the conventional sidecast dredge.

1979, Lockwoods Folly Inlet: Environmental Impact Statement, page 35:

(engineering) A mode of using a suction dredge that sidecasts the material that is dredged up using a pipeline to the bank or by jetting.


master cylinder

master cylinder (plural master cylinders)

(engineering) A control device that converts nonhydraulic pressure into hydraulic pressure.


slave cylinder

(engineering) A small cylinder, dependent on a master cylinder, that contains a piston.


bench bleed

en-verb

bench bleed (third-person singular simple present bench bleeds, present participle bench bleeding, simple past and past participle bench bled or bench bleeded)

bench bleeds (present singular third-person)
bench bleeding (participle present)
bench bled (participle past)
bench bled (past)
bench bleeded (participle past)
bench bleeded (past)

This process is usually done while sitting on a bench.

(engineering) To bleed a master cylinder.


bench bleeder

(engineering, rare) A device that removes air from the system to assist with bench bleeding.


corner case

2001, Faisal I. Haque, Khizar A. Khan, Jonathan Erik Michelson, The Art of Verification with Vera, Verification Central LLC
The smallest and largest legal packet sizes are examples of the first type of corner case. This type of boundary condition is usually specified by or easily inferred from the externally published feature set of the design.

Using assumptions, however, our goal is to prove correctness while finding complex corner-case bugs.

2006, Harry D. Foster, Adam C. Krolnik, David J. Lacey, Assertion-Based Design, Springer Science & Business Media, →ISBN, page 58:

(chiefly engineering) A problem or situation that occurs only when two or more operating parameters are at extreme values, or when two or more unusual operating circumstances happen to coincide.


planetary engineering

Near-synonyms: geoengineering, terraforming

The manipulation of a planet's environment to create a new environment.


Smith chart

Invented by Phillip H. Smith (1905–1987).

A nomogram displaying impedances, admittances, etc., used by engineers to assist in solving problems with transmission lines and matching circuits.


true stress

(engineering) The instantaneous stress caused by a load acting on a unit cross section


air hammer

(engineering, construction) A hammer powered by compressed air.


journal bearing

en-noun

journal bearing (plural journal bearings)

(engineering) A simple bearing in which part of the outer surface of a cylindrical shaft, the “journal”, slides on the inner surface of a cylindrical hole, with no rolling elements.


Martindale

(textiles, engineering) A unit for quantifying the abrasion resistance of textiles, especially when used for upholstery.


Nyquist

(mathematics, engineering) The Nyquist frequency of a system.


decommit

en-verb

decommit (third-person singular simple present decommits, present participle decommitting, simple past and past participle decommitted)

decommits (present singular third-person)
decommitting (participle present)
decommitted (participle past)
decommitted (past)

(computing theory, engineering) To deactivate or decommission.


OME

order of magnitude
order of magnitude#English

(engineering) Initialism of order of magnitude estimate.


self-oiling

(engineering) Automatically lubricating itself with oil while in operation.


fishbolt

(engineering) A bolt used to fasten fishplates.


cuphead

(engineering) A hemispherical head on a rivet.


signal boost

Taking advantage of acoustical resonances results in a signal boost and enables highly sensitive analyzers with low detection limits.

2012, M. Wolff with B. Kost and B. Baumann, “Shape-Optimized Photoacoustic Cell: Numerical Consolidation and Experimental Confirmation”, in International Journal of Thermophysics, volume 33, numbers 10-11, →DOI, page 1953:

(engineering) an increase in the capacity, strength, or range of a signal


post-tension

post-tension (third-person singular simple present post-tensions, present participle post-tensioning, simple past and past participle post-tensioned)

post-tensions (present singular third-person)
post-tensioning (participle present)
post-tensioned (participle past)
post-tensioned (past)

This minimum amount and location of post-tensioning force should be noted on the structural drawings.

1977, Post-Tensioning Institute, Design of Post-tensioned Slabs, page 37:

Slab post-tensioned and/or reinforced with active pre-stress: These slabs are designed following the Post-Tension Institute's procedures using active prestress, which permits thinner slabs. They are reinforced with post-tensioning tendons and mild steel reinforcement

2007, American Institute of Architects, edited by Andy Pressman, Architectural Graphic Standards, page 37:

(construction, engineering) To apply tension (to reinforcing tendons) after casting concrete.


post-tensioning

(engineering) Application of tension to a structure after it has gained a specified strength or age, especially to steel tendons in concrete to reinforce the structure.

μετατάνυση

engineering; concrete structure technique


paraterraforming

A variation of the hypothetical process of terraforming in which a transparent dome is built over most or all of the sterile planet, moon or similar body to work as a giant greenhouse or "worldhouse".


paraterraformation

en-noun

paraterraformation (countable and uncountable, plural paraterraformations)


Moody chart

Introduced by Lewis Ferry Moody in 1944.

(engineering) A kind of graph that relates various properties of a circular pipe, used to predict pressure drop or flow rate.


preblow

en-verb

preblow (third-person singular simple present preblows, present participle preblowing, simple past preblew, past participle preblown)

preblows (present singular third-person)
preblowing (participle present)
preblew (past)
preblown (participle past)

(transitive, engineering) To blow (glass, plastics, etc.) in advance.


cut sheet

(engineering) A document summarizing the performance and other technical characteristics of a product.


tractive effort

en-noun

tractive effort (plural tractive efforts)

Consequently, they developed articulateds capable of exerting 7500 drawbar horsepower or a starting tractive effort of 170,000 pounds.

1959, David P. Morgan, editor, Steam's Finest Hour, Kalmbach Publishing Co.:

(engineering, rail transport) the tractive force that can be generated by a prime mover to pull a load; cardinal examples are a locomotive pulling a train, a semi-tractor pulling a trailer or a tractor pulling a plow.

thrust

the analogue for aircraft engines, rocket engines, and watercraft propulsion

torque

moment of force; the analogue in rotational reference


flare-nut wrench

flare-nut wrench (plural flare-nut wrenches)

flare-nut wrenches (plural)
flare nut wrench (alternative)

(engineering) An open spanner (wrench) to tighten fragile nuts, such as flare nuts, not accessible to a ring spanner (box end wrench) or box spanner (tube spanner).


gyradius

1966, Bruce Jennings Muga, Experimental and Theoretical Study of Motion of a Barge as Moored in Ocean Waves, Department of Civil Engineering, University of Illinois, page 17,
It should be noted that the vertical center of gravity (VCG), the longitudinal gyradius, and the natural pitch period do not agree with those required to simulate the full-scale prototype.

The roll, pitch and yaw gyradii (k₄₄, k₅₅ and k₆₆) were determined using the pendulum method by swinging the model in the air.

1999, J. de Kat, W. Thomas III, “Extreme Broaching, Rolling and Capsizing-Model Tests and Simulations of a Steered Ship in Waves”, in Twenty-Second Symposium on Naval Hydrodynamics, National Academy Press, page 363:

Weight distribution may be considered in any desired plane, usually in longitudinal and transverse senses. It is measured by the moment of inertia and is usually expressed as the gyradius which relates the moment of inertia to displacement.[…]Thus a large gyradius, longitudinal or transverse, tends towards easy motion and is desirable in terms of comfort. In passing it might be observed that the need for a very minimum longitudinal gyradius has become an article of faith among racing sailors.

2008, Peter Bruce, Adlard Coles' Heavy Weather Sailing, 6th edition, McGraw-Hill, page 8:

(physics, engineering) Radius of gyration.


microplane

6.7.2 Microplane Models: The framework of anisotropic damage models allows for the incorporation of models that are based on the microplane concept. The microplane concept was originally conceived for metals, where well-defined planes exist in the crystal lattice, along which slip occurs preferentially. This theory, originated by Batdorf and Budiansky (1949), was originally named the slip theory and is now commonly referred to as crystal plasticity (Miehe and Schotte 2004). Later, the concept of preferential slip planes was adapted to damage and fracture in quasi-brittle materials such as concrete and rock and was renamed the microplane model (Bazant and Gambarova 1984) or multilaminate model (Zienkiewicz and Pande 1977). Obviously, the physical basis is now less obvious in the sense that preferential fracture planes cannot be distinguished, but by defining a sufficiently large number of potential fracture planes the damage evolution can be described accurately. Two major classes of microplane models can be distinguished, namely those based on the kinematic constraint and those based on a static constraint.

2012, René de Borst, Mike A. Crisfield, Joris J. C. Remmers, Clemens V. Verhoosel, Nonlinear Finite Element Analysis of Solids and Structures (Wiley Series in Computational Mechanics), 2nd edition, Wiley, →ISBN:

(engineering) One of a set of planes, variously oriented and microscopically bounded, within a material, used in modelling stresses etc.


double-acting

(engineering, mechanics) Applying power in two directions.


rockable

(engineering) Able to rock back and forth.


retooth

en-verb

retooth (third-person singular simple present retooths, present participle retoothing, simple past and past participle retoothed)

retooths (present singular third-person)
retoothing (participle present)
retoothed (participle past)
retoothed (past)

(transitive, engineering) To fit with new teeth.


knuckle joint

(engineering) A joint where the forked end of a connecting rod is joined by a bolt to another piece of the machinery.


differential screw

en-noun

differential screw (plural differential screws)

(engineering) A mechanism that uses two screw threads to make small, precise adjustments to the spacing between two objects, as in focusing a microscope or moving the anvils of a micrometer.


idle wheel

(engineering) A wheel placed between two others to transfer motion from one to the other without changing the direction.


MPC

model predictive control
w:model predictive control

(engineering) Initialism of model predictive control.


wrist pin

(engineering) Any pin connecting a pitman to a crosshead.


rock cam

(engineering) A cam keyed to a rock shaft.


parallel motion

(engineering) Any linkage by which circular motion may be changed into motion in a straight line.


solar thermal collector

solar thermal collector (plural solar thermal collectors)

A panel that is used to collect heat from solar radiation, typically in order to produce domestic hot water


neck bearing

(engineering) The part of a shaft that rotates in the bearing proper; a journal.


spur-wheel

(engineering) A wheel with the cogs on the face of the edge like a spur.


countrate

(physics, engineering) The rate at which something is counted, measured as how many times it is observed in a unit of time.


double flash

Dipippo, in 2008, reported that the double-flash plant increased power output by 15-25% compared to a single flash plant under the same geothermal fluid conditions [9, 10].

2018, A Rachmat, Nasruddin, A S Wibowo, A Surachman, “Exergoeconomic analysis and optimization of a combined double flash–binary cycle for Ulubelu geothermal power plant in Indonesia”, in IOP Conference Series: Earth and Environmental Science, volume 105 (PDF), IOP Publishing Ltd, →DOI, →ISSN:

(engineering) A system using two flash separators to separate phases of a working fluid.


drivehead

Stating that the circumstances of this accident disclosed a number of features which ought to be borne in mind in working shearer loader faces, Mr. Nussey points out that the drivehead of the conveyor was not securely stelled before the accident and the extra pull on the haulage rope pulled it towards the centre of the face.

1963, Steel & Coal, volume 187, page 450:

One end of the sleeve is bolted to the drive spring and the other end of the drive spring is bolted to the drivehead. The drivehead is keyed and bolted to the armature shaft by the shank of the same bolt that holds the drivespring to the drivehead.

1989, Larry D. Duggins, Aviation Support Equipment Technician 2, pages 6–10:

(engineering) A cap or similar end-piece that fits over or into the end of a moving mechanical part to protect the end from driving of that part.


K truss

(engineering) A kind of truss shaped like the capital letter K.


Warren truss

Named after one of its designers, James Warren.

equilateral triangle
equilateral triangle

(engineering) A truss employing a weight-saving design based on equilateral triangles.


X truss

(engineering) A kind of truss shaped like the letter X.


squawk book

Remember, for pilots it is very important to keep detailed notes in your squawk book and set aside some time to discuss the problem with your technician.

2001, Edward R. Maher, Avionics Troubleshooting and Repair, page xvi:

(aviation) An aircraft engineer's notebook listing the faults that need attention.


live steam

(engineering) Steam under pressure from a boiler.


EEE

(geology, engineering) Initialism of earthquake environmental effect(s).


effective compression

Effective compression has been well understood as a potential hazard in other oil and gas industry applications, including the design and operation of pipelines, well casing and well tubing, and of marine risers in deepwater drilling service such as those on the Deepwater Horizon.

2014 June 5, “Explosion and Fire at the Macondo Well”, in Investigation Report, US Chemical Safety and Hazard Investigation Board:

(engineering) A phenomenon where high pressure inside a pipe causes it to buckle.


Cape Cod berm

We installed 45,000 square feet (overlay) of hot mix asphalt (HMA) at a depth of 2 inches as well as installed new cape cod berm around the perimeter of the entire parking lot.

2015, U.S. Pavement Services, (Please provide the book title or journal name):

The Cape Cod berm is more popular and has a slope from the street up.

2020, Auburn, Massachusetts Highway Division:

(engineering) A low asphalt berm with sloped face at the edge of a paved area.


add in quadrature

en-verb

add in quadrature (third-person singular simple present adds in quadrature, present participle adding in quadrature, simple past and past participle added in quadrature)

adds in quadrature (present singular third-person)
adding in quadrature (participle present)
added in quadrature (participle past)
added in quadrature (past)

The derived expression for the g‐r noise consists of a thermal component and a background component which add in quadrature.

1982, “Theory of generation‐recombination noise in intrinsic photoconductors”, in Journal of Applied Physics, volume 53, →DOI:

(sciences, engineering) To combine the magnitude of two uncorrelated signals, usually noise or errors, by taking the square root of the sum of the squares.


tunnel boring machine

en-noun

tunnel boring machine (plural tunnel boring machines)

Images of the first two Tunnel Boring Machines (TBMs) under construction for HS2 were released on May 26.
Each TBM is 170 metres long and weighs around 2,000 tonnes. Once in use, they will run non-stop for three and a half years, stopping only for Christmas and Bank Holidays.

2020 June 3, “Network News: Vote now to choose names of HS2 Tunnel Boring Machines”, in Rail, page 11:

(engineering) A large machine used to excavate tunnels with a circular cross section.

টানেল বোরিং মেশিন

a large machine used to excavate tunnels with a circular cross section

全断面トンネル掘進機

ぜんだんめんトンネルくっしんき


nanogripper

(engineering) A nanoscale device used to grasp and manipulate nanoscale objects.


deadcenter

(engineering) Alternative form of dead center.


dead-center

dead-centers (plural)
dead center (alternative)
deadcenter (alternative)


midplate

(engineering) A plate positioned between other components.


monostrand

Formwork was removed after 24 hours, as the compressive strength of the RPC reached 50 MPa. It was then possible to prestress the diagonals' monostrands and to lift the segment. A 48-hours heat treatment was then applied by injecting 90 C water vapor under a plastic enclosure (Fig. 6).

1998, Pierre-Claude Aïtcin, Mohamed Lachemi, Regis Adeline, Pierre Richard, “The Sherbrooke Reactive Powder Concrete Footbridge”, in Structural Engineering International, volume 8, number 2, →DOI:

(engineering, often attributive) An tendon that is composed of a single wire or bar.


crankwalk

From crank + walk. From crankshaft drifting around alignment.

(automotive, engineering) The condition of having excessive play in the crankshaft alignment, letting it drift back and forth, allowing off-alignment interaction with the rest of the engine.

crankwalking

The action of off-alignment activity due to the condition


V-

(automotive, engineering) Referring to an internal combustion engine piston cylinder configuration, where the cylinders are aligned in a V-like shape, in which there is an acute angle between the cylinders, and the bottom of the cylinder, where the crank is, is the bottom of the V, and the top of the cylinder is where the fuel, intake and exhaust ports are located.

W-

like the V-, but with an additional cylinder row up the centre

Y-

like the V-, but with an additional cylinder row down the centre

T-

like the H-, but with an additional cylinder row up the centre


radius of gyration

radius of gyration (plural radii of gyration)

Since the radius of gyration depends on the manner in which the mass is arranged round the axis, it follows that for different axes in the same body there will be different radii of gyration.

1852, [1831], Henry Kater, Dionysius Lardner, A Treatise on Mechanics, page 137:

The radii of gyration parallel and perpendicular to the director are obtained from macroscopically aligned samples by using a two-dimensional detection method.

1989, Christine Boeffel, Hans Wolfgang Spiess, “8: NMR methods for studying molecular order and motion in liquid crystalline side group polymers”, in C. B. McArdle, editor, Side Chain Liquid Crystal Polymers, Blackie and Son, page 251:

As it^([sic]) was already mentioned earlier, the radius of gyration represents the size of a scattering object. The average radius of gyration involves the ratio of the eighth power of the radius of gyration of the individual particles R#95;i, to the sixth power of R#95;i; this means that with the broad pore size distribution of the cement paste, the average is dominated by the large pores and the small pores have virtually no impact upon the radius of gyration.

2006, Kalliopi K. Aligizaki, Pore Structure of Cement-Based Materials, Taylor & Francis, page 270:

(physics, engineering) Given a body B, the distance from a given axis of rotation at which a point mass of the same mass as B would have the same moment of inertia about said axis.

Streumassenradius

distance from a given axis at which a point mass of the same mass as a given body would have the same moment of inertia


subrationalization

From sub- + rationalization, in reference to Heaviside's call for a more "rational" system.

(engineering, historical) A proposed change to the centimeter-gram-second (CGS) system of units to make them easier to work with.


subrationalized

(engineering, historical) Having undergone subrationalization.


poppit

(engineering) Alternative form of poppet.


fast reactor

highly-enriched uranium
highly-enriched uranium

(nuclear physics, engineering) A nuclear reactor with no moderator, using fast neutrons directly in a controlled fission chain reaction without slowing them down, allowing for a much more compact reactor which uses fissile material much more efficiently and generates larger quantities of high-energy neutrons which can be used for breeding more fissile material or producing other useful radioactive nuclides, but requiring the use of highly-enriched uranium (at least 20% uranium-235) or other fuel containing a similarly high concentration of fissile material.


FEP

FEP (countable and uncountable, plural FEPs)

(organic chemistry, engineering, uncountable) Initialism of fluorinated ethylene/propylene (a type of fluoropolymer).


topping cycle

The very-high-temperature helium turbine, driven directly by the superheated coolant from the fission reactor, serves as the topping cycle for a mercury-vapor turbine powered by the heat given up by the helium; the mercury turbine itself serves as the topping cycle for the steam turbine that takes up most of the space of the turbine hall.

(engineering) The high-temperature power cycle of a combined cycle power plant.


Shabbat elevator

Shabbat elevator (plural Shabbat elevators)

Shabbat elevators (plural)
Sabbath elevator (alternative)
Shabbos elevator (alternative)

(engineering, Judaism) An elevator/lift (device for transport within a building) which operates automatically on Shabbat, generally by stopping and opening its doors at each floor of the building, allowing observant Jews to make use of the elevator without violating Jewish prohibitions against operating electrical machinery on Shabbat.


screwdriver operation

screwdriver operation (plural screwdriver operations)

(engineering) A mechanical task requiring relatively little skill.


AFRP

AFRP (usually uncountable, plural AFRPs)

The following is the modification status of the occurrence rudder: [...] Modification 5844 (Glass Intermediate Layer). The occurrence rudder was a post-modification 5844 (Service Bulletin [SB] A310-55-2012) design, which incorporated a GFRP layer between the honeycomb and the CFRP skin, rather than aramid fibre–reinforced plastic (AFRP) as used in ^([sic]) earlier design.

2007, Transportation Safety Board of Canada, “1.5.7 Rudder Modification Status”, in Aviation Investigation Report A05F0047, Loss of Rudder in Flight, Air Transat Airbus A310-308 C-GPAT, Miami, Florida, 90 nm S, 06 March 2005, archived from the original on 2021-05-01, page 10:

(engineering) Initialism of aramid-fiber/fibre-reinforced plastic/polymer.


disbond

(engineering) A delaminated area of a layered material.

(engineering) An occurrence of delamination.


disbond

en-verb

disbond (third-person singular simple present disbonds, present participle disbonding, simple past and past participle disbonded)

disbonds (present singular third-person)
disbonding (participle present)
disbonded (participle past)
disbonded (past)


self-locking

a self-locking nut

a hydraulic self-locking jack

(engineering) That remains safely in place after being moved or positioned, even in the absence of continued applied force.


iron ring

From being a finger ring made of wrought iron, traditionally explained as being extracted from the debris cleared from the collapse of the Quebec Bridge.

(Canada, engineering) The symbol of a Canadian engineer. A faceted stainless steel or iron ring worn on the little finger of the dominant hand, signifying a trained Canadian engineer, awarded in Canada after an accompanying oath of professional conduct, in a private ceremony with dramatic rites.


accelerated ageing

A test that uses aggravated conditions (e.g. heat, humidity etc.) to speed up the normal ageing process of an item to see the long-term effects on it within a shorter period of time.


international standard

en-noun

international standard (plural international standards)

A technical standard which is developed by one or more international standards organizations which is available for use worldwide.


technical standard

technical standard (plural technical standards)

A set of norms or requirements for a repeatable technical works where it uses common and repeated use of rules and guidelines for products, processes or management systems practices.


salt spray test

salt spray test (plural salt spray tests)

A corrosion test method to check on the corrosion resistance of a material or surface coating.


dozzle

The method of preventing the formation of shrinkage cavity within bottom cast ingots which consists introducing the metal into the mould through a dozzle and a plate having a plurality of inclined conduits, whereby the incoming metal is directed against the walls of the dozzle, this heating said walls to incandescence, then reversing the mould, said dozzle after the mould is reversed causing the metal in contact therewith to feed downwards into any shrinkage cavity within the ingot.

1913, James Rossiter Hoyle, Arthur William Brearley, “149,153 Ingot Casting Method”, in Canadian Patent Office Record, volume 41, page 2249:

When the metal has risen to within, say, 3 inches of the top of the mold, a “dozzle," which has been previously heated in one of the holes, is quickly dropped on top of the metal in the mold, and held in position whilst the few pounds of metal remaining in the crucible are poured through its center.

1918, Journal of the American Society of Naval Engineers, Inc, page 347:

They also adopted the dozzle, invented by R. F. Mushet in 1861, to eliminate piping in the steel ingots.

2020, Robert B. Gordon, American Iron, 1607-1900:

(engineering) A device, originally a heated sleave of fire clay, variously used to introduce molten metal to counter the formation of hollows in metal castings as they shrink while the mould cools. Now commonly called hot top or feeder head


grinding gear

(engineering) functional unit of an apparatus that breaks solid materials into smaller pieces


direct air capture

(engineering) Pertaining to direct air capture technology; the technology of directly extracting specific gases from the ambient atmosphere.

(geoengineering) Pertaining to the process of directly extracting carbon dioxide from the air.


keystrip

Figure 47 illustrates a type KS-1 keystrip and figure 48 shows a type KS-2 keystrip. Flat-nose pliers or a similar tool can be made to make the adjustments to the keystrips.

1947, United States. War Department, Technical Manual, page 127:

The wiring to each pushbutton of a keystrip is accomplished by a color-coded plug-socket arrangement.

1974, GTE Automatic Electric Technical Journal - Volume 14, page 219:


drawspan

(engineering) The operational span of a drawbridge.


tofu-dreg

Calque of Chinese 豆腐渣 (dòufuzhā, “tofu dreg; okara”), dòufuzhā as in 豆腐渣工程 (dòufuzhā gōngchéng) and similar phrases. Coined by Tan Zuoren in 2008.

calque

No one asks about the shoddy “tofu-dregs engineering”; instead, we blindly accuse “running teacher Fan.” Nationalism is only a fig leaf for the feeble-minded, a tricky maneuver that prevents everyone from seeing the complete picture.

2011, Ai Weiwei, Ai Weiwei's Blog: Writings, Interviews, and Digital Rants, 2006-2009, MIT Press, →ISBN, page 177:

In the 2008 Sichuan earthquake several thousand school buildings collapsed, killing thousands of children and bringing the world's attention to the shoddy “tofu-dregs” buildings and rampant corruption that had skimmed the public funds ...

2014, Catie Snow Bailard, Democracy's Double-Edged Sword: How Internet Use Changes Citizens' Views of Their Government, Johns Hopkins University Press+ORM, →ISBN:

Tan Zuoron, a writer who tried to document “shoddy tofu-dregs construction” that might have caused massive school-building collapses, was sentenced to prison.

2014, Yi Kang, Disaster Management in China in a Changing Era, Springer, →ISBN, page 56:

For example, the Kunming-Luquan highway in Kunming, Yunnan Province, had become a “tofu dreg project.”

2015, Rongji Zhu, Zhu Rongji on the Record: The Road to Reform: 1998-2003, Brookings Institution Press, →ISBN, page 98:

Individual Chinese citizens explicitly criticized the Ministry of Railway, describing it with such disparaging terms as ‘asshole’ and ‘bastard,’ and described the high-speed train project as one of the ‘tofu-dreg projects (豆腐渣工程 in Mandarin),’ which referred to projects with poor [quality].

2015, Y. Liu, “Tweeting, re-tweeting, and commenting: Microblogging and social movements in China”, in Asian Journal of Communication:

‘Tofu-dreg Projects’ during the Ming dynasty.

2016, S. Sun, “The Three Conditions for Behavior, and the Five Behavior Management Measures”, in Five Basic Institution Structures …:

The poor condition of tofu dregs schoolhouses was used to explain the high casualty rate, but the statistic did not fly. The ratio of young to old among the dead—roughly one to ten—ought to have been less stark.

2017, Paul Midler, What's Wrong with China, John Wiley & Sons, →ISBN:

(engineering, attributive) A poorly constructed building in China, or the shoddy material(s) used to construct it.


fuse plug

ACI's Hong Kong station manager was at a loss as to how best to proceed. Flight 103's brakes had been cooled with blowers, and the plane towed to its gate. It had three blown tires, one had burst on the runway when the aircraft's anti‑skid system failed and two had deflated when their red-hot brakes had overheated the tires and the fuse plugs had blown. The tire that had blown on the runway had disintegrated and punched two holes in the aircraft's undersurface. The holes were small, but they had to be fixed.

2018 February 8, Terry Liittschwager, chapter 30, in Wrongful Act, archived from the original on 2022-01-31:

(aviation) A component of an aircraft wheel held in place by a metal alloy with a low melting point, such that, if the wheel is severely overheated (for instance, by heavy braking), pressure is released from the wheel and tire/tyre in a controlled manner rather than risking an explosion of the wheel assembly.

(civil engineering) A collapsible dam or levee designed to give way in extreme flood conditions in order to divert water away from more important water-control structures.


horizontal standard

en-noun

horizontal standard (plural horizontal standards)

A technical standard which is applicable to all industries in general.


device under test

device under test (plural devices under test)

A manufactured product undergoing testing, either at first manufacture or later during its life cycle as part of ongoing functional testing and calibration checks, which can also include a test after reparation to establish that the product is performing in accordance with the original product specification.


shielded room

A room which has protection against various external interferences (e.g. electromagnetic signals) for critical application use.


lumped-element model

lumped-element model (plural lumped-element models)

A model that uses simplified description of behavior of spatially distributed physical system into a topology which consists of discrete entities that approximate the behavior of the distributed system under certain assumptions.


suck, squeeze, bang, blow

From the action of each stroke of the 4-stroke Otto cycle. The intake stroke, compression stroke, power stroke, exhaust stroke.

suck-squeeze-bang-blow (alternative)
suck squeeze bang blow (alternative)

internal combustion engine
internal combustion engine

(automotive, engineering) A reference to the Otto cycle and four-stroke internal combustion engines.


counterfaller

(engineering) A faller that opposes another faller, so that one rises while the other is descending.


raise steam

en-verb

raise steam (third-person singular simple present raises steam, present participle raising steam, simple past and past participle raised steam)

raises steam (present singular third-person)
raising steam (participle present)
raised steam (participle past)
raised steam (past)

[…] the fireman has to divide his time between getting up into the bunker to throw more turfs into the cab, and getting down on his hands and knees to get it into the firebox, and even then a reserve supply of turf must be carried on a truck behind the engine, and stops must be made on each steep ascent to raise more steam.

1945 January and February, “Notes and News: Locomotive Firing with Turf”, in Railway Magazine, page 46:

(engineering, nautical, rail transport) To build up a useful head (pressure level) of steam in a steam-engined vehicle's boiler.


rampable

en-adj

rampable (comparative more rampable, superlative most rampable)

more rampable (comparative)
most rampable (superlative)

(engineering) Able to be ramped, or made to change value at a steady rate.


keyseater

(engineering) An instrument for keyseating.


plain bearing

(engineering) A bearing with no rolling elements, consisting of a protective surface to reduce friction.


underfeeder

LL-Q1860 (eng)-Flame, not lame-underfeeder.wav

From under- + feeder or underfeed + -er.

He speaks well of Andrews' Helix Underfeeder, by which the fire is always fed from below.

1890, The Review of Reviews, volume 2, page 29:

(engineering) A device that feeds in material from below.


Fermi problem

Named after Enrico Fermi, known for his ability to deal with such problems.

dimensional analysis
dimensional analysis

(physics, engineering) Any estimation problem designed to teach dimensional analysis or the approximation of extreme scientific calculations: often a back-of-the-envelope problem with limited data.


Fermi estimate

(physics, engineering) An estimate of the kind that answers a Fermi problem.


first angle projection

en-noun

first angle projection (countable and uncountable, plural first angle projections)

(uncountable) A method of technical drawing where the front view of the object is placed in the first quadrant, the side view is to the left, and the top view is below it. (More common in Europe and Asia.)

(countable) A drawing produced in this style.


third angle projection

third angle projection (countable and uncountable, plural third angle projections)

(uncountable) A method of technical drawing where the front view of the object is placed in the third quadrant, the side view is to the right, and the top view is above it. (More common in North America.)


chuck key

(engineering) A wrench-like device used to tighten or loosen a chuck.