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1 fourth-place accuracy
Большой англо-русский и русско-английский словарь > fourth-place accuracy
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2 fourth-place accuracy
Англо-русский словарь технических терминов > fourth-place accuracy
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3 fourth place accuracy
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4 fourth-place accuracy
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5 accuracy
1) точность2) метр. погрешность3) правильность•accuracy better than —... погрешность менее...;to an accuracy of —... с погрешностью...;to any required degree of accuracy — с любой заданной степенью точности;to claim an accuracy — приписывать точность или погрешность;to impair accuracy — снижать точность;to improve ( to increase) accuracy — повышать точность;to restore rated accuracy — возвращать ( прибору) первоначальную номинальную точность ( при проверке или ремонте);to trace the accuracy to a standard — прослеживать путь передачи точности от эталона ( средству измерений);to transfer accuracy — 1. передавать размер единицы физической величины 2. передавать ( прибору) точность (от образцового средства измерений);to translate accuracy — передавать размер единицы физической величины;with an accuracy of... — с погрешностью...-
absolute accuracy
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absolute time base accuracy
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acceptable accuracy
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adequate accuracy
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alignment accuracy
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assigned accuracy
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attainable accuracy
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available accuracy
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azimuth accuracy
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calibrated accuracy
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calibration accuracy
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comparable accuracies
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comparison accuracy
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compensation accuracy
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composite accuracy
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continuing accuracy
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control accuracy
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design accuracy
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dimensional accuracy
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dynamic accuracy
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estimated accuracy
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experimental accuracy
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extreme accuracy
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fair accuracy
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finish accuracy
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flat surface accuracy
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form accuracy
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fourth-place accuracy
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fractional accuracy
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frequency accuracy
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full-scale accuracy
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functional accuracy
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high accuracy
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highest system accuracy
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inherent accuracy
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initial accuracy of oscillator
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instrument accuracy
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intrinsic accuracy
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lasting accuracy
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limited accuracy
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logging accuracy
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long-term accuracy
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low accuracy
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measurement accuracy
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modest accuracy
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module accuracy
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obtainable accuracy
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original accuracy
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overall accuracy
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overlay accuracy
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pinpoint accuracy
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playback accuracy
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poor accuracy
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positional accuracy
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positional playback accuracy
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positioning accuracy
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potential accuracy
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prescribed accuracy
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rated accuracy
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reasonable accuracy
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recognition accuracy
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registration accuracy
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relative accuracy
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repeatability accuracy
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roundness accuracy
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runout accuracy
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set-on accuracy
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split-hair accuracy
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standards laboratory accuracy
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static accuracy
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statistical accuracy
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sustained accuracy
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temperature accuracy
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transfer accuracy
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true accuracy
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volumetric accuracy
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working accuracy -
6 Harrison, John
[br]b. 24 March 1693 Foulby, Yorkshire, Englandd. 24 March 1776 London, England[br]English horologist who constructed the first timekeeper of sufficient accuracy to determine longitude at sea and invented the gridiron pendulum for temperature compensation.[br]John Harrison was the son of a carpenter and was brought up to that trade. He was largely self-taught and learned mechanics from a copy of Nicholas Saunderson's lectures that had been lent to him. With the assistance of his younger brother, James, he built a series of unconventional clocks, mainly of wood. He was always concerned to reduce friction, without using oil, and this influenced the design of his "grasshopper" escapement. He also invented the "gridiron" compensation pendulum, which depended on the differential expansion of brass and steel. The excellent performance of his regulator clocks, which incorporated these devices, convinced him that they could also be used in a sea dock to compete for the longitude prize. In 1714 the Government had offered a prize of £20,000 for a method of determining longitude at sea to within half a degree after a voyage to the West Indies. In theory the longitude could be found by carrying an accurate timepiece that would indicate the time at a known longitude, but the requirements of the Act were very exacting. The timepiece would have to have a cumulative error of no more than two minutes after a voyage lasting six weeks.In 1730 Harrison went to London with his proposal for a sea clock, supported by examples of his grasshopper escapement and his gridiron pendulum. His proposal received sufficient encouragement and financial support, from George Graham and others, to enable him to return to Barrow and construct his first sea clock, which he completed five years later. This was a large and complicated machine that was made out of brass but retained the wooden wheelwork and the grasshopper escapement of the regulator clocks. The two balances were interlinked to counteract the rolling of the vessel and were controlled by helical springs operating in tension. It was the first timepiece with a balance to have temperature compensation. The effect of temperature change on the timekeeping of a balance is more pronounced than it is for a pendulum, as two effects are involved: the change in the size of the balance; and the change in the elasticity of the balance spring. Harrison compensated for both effects by using a gridiron arrangement to alter the tension in the springs. This timekeeper performed creditably when it was tested on a voyage to Lisbon, and the Board of Longitude agreed to finance improved models. Harrison's second timekeeper dispensed with the use of wood and had the added refinement of a remontoire, but even before it was tested he had embarked on a third machine. The balance of this machine was controlled by a spiral spring whose effective length was altered by a bimetallic strip to compensate for changes in temperature. In 1753 Harrison commissioned a London watchmaker, John Jefferys, to make a watch for his own personal use, with a similar form of temperature compensation and a modified verge escapement that was intended to compensate for the lack of isochronism of the balance spring. The time-keeping of this watch was surprisingly good and Harrison proceeded to build a larger and more sophisticated version, with a remontoire. This timekeeper was completed in 1759 and its performance was so remarkable that Harrison decided to enter it for the longitude prize in place of his third machine. It was tested on two voyages to the West Indies and on both occasions it met the requirements of the Act, but the Board of Longitude withheld half the prize money until they had proof that the timekeeper could be duplicated. Copies were made by Harrison and by Larcum Kendall, but the Board still continued to prevaricate and Harrison received the full amount of the prize in 1773 only after George III had intervened on his behalf.Although Harrison had shown that it was possible to construct a timepiece of sufficient accuracy to determine longitude at sea, his solution was too complex and costly to be produced in quantity. It had, for example, taken Larcum Kendall two years to produce his copy of Harrison's fourth timekeeper, but Harrison had overcome the psychological barrier and opened the door for others to produce chronometers in quantity at an affordable price. This was achieved before the end of the century by Arnold and Earnshaw, but they used an entirely different design that owed more to Le Roy than it did to Harrison and which only retained Harrison's maintaining power.[br]Principal Honours and DistinctionsRoyal Society Copley Medal 1749.Bibliography1767, The Principles of Mr Harrison's Time-keeper, with Plates of the Same, London. 1767, Remarks on a Pamphlet Lately Published by the Rev. Mr Maskelyne Under theAuthority of the Board of Longitude, London.1775, A Description Concerning Such Mechanisms as Will Afford a Nice or True Mensuration of Time, London.Further ReadingR.T.Gould, 1923, The Marine Chronometer: Its History and Development, London; reprinted 1960, Holland Press.—1978, John Harrison and His Timekeepers, 4th edn, London: National Maritime Museum.H.Quill, 1966, John Harrison, the Man who Found Longitude, London. A.G.Randall, 1989, "The technology of John Harrison's portable timekeepers", Antiquarian Horology 18:145–60, 261–77.J.Betts, 1993, John Harrison London (a good short account of Harrison's work). S.Smiles, 1905, Men of Invention and Industry; London: John Murray, Chapter III. Dictionary of National Biography, Vol. IX, pp. 35–6.DV -
7 machining
обработка, механическая обработка, механообработка, обработка резанием, обработка на металлорежущем станкеmachining all surfaces at a set — обработка всех поверхностей ( заготовки) с одного установа
machining from solid — обработка ( детали) из целого, обработка ( детали) из целого куска
machining from the solid — обработка ( детали) из целого, обработка ( детали) из целого куска
in machining — в обработке, при обработке
machining through all angles — обработка под любым углом, обработка изделий под любым углом
- 2 1/2-dimensional machiningmachining to close limits — обработка с жёсткими допусками; точная обработка
- 3D cavity machining
- 3D machining
- abrasive belt machining
- abrasive flow machining
- abrasive machining
- abrasive-electrochemical machining
- abrasive-waterjet machining
- adaptive controlled machining
- adaptive machining
- all-over machining
- angular machining
- anode-mechanical machining
- around-the-part machining
- associative machining
- automated machining
- automotive machining
- back end machining
- back-face machining
- balanced machining
- batch machining
- batch-lot machining
- beam machining
- bore machining
- CAM machining
- C-axis machining
- center machining
- chemical machining
- chip-type machining
- close tolerance machining
- closed loop machining
- CNC horizontal machining
- CNC machining
- CNC screw machining
- composite machining
- computer-controlled machining
- consistent machining
- constant power machining
- contact-initiated discharge machining
- contact-initiated machining
- continuous path machining
- contour machining
- contouring machining
- controlled machining
- conventional machining
- copy machining
- datum machining
- deephole machining
- diamond machining
- dual-spindle machining
- duplex machining
- duplicate machining
- edge machining
- electrical discharge machining
- electrical machining
- electrical spark machining
- electrochemical machining
- electroerosion abrasive machining
- electroerosion machining
- electrolytic abrasive machining
- electrolytic machining
- electron beam machining
- electron discharge machining
- electronic erosion machining
- electrophysical machining
- electrospark machining
- etch machining
- false machining
- fast laser machining
- feature-based machining
- final machining
- final tolerance machining
- finish machining
- finished machining
- five-axis CNC machining
- five-axis machining
- five-face machining
- five-sided machining
- fixed-axis machining
- flat abrasive machining
- flexible machining
- flow-line machining
- flowthru machining
- flush fine machining
- form-feature machining
- front-end machining
- gear machining
- generative machining
- group machining
- hard-part machining
- heavy machining
- heavy-duty machining
- high-accuracy machining
- high-definition finish machining
- high-efficiency machining
- high-production machining
- high-speed machining
- high-volume machining
- horizontal machining
- horizontal mode machining
- hot machining
- hydrodynamic machining
- inclined-plane machining
- in-cycle machining
- industrial laser machining
- in-place machining
- interference-free machining
- intol/outtol machining
- ion beam machining
- jet-assisted machining
- job shop machining
- laser machining
- laser-assisted machining
- laser-beam machining
- lathe machining
- LH machining
- light-duty machining
- lights-out machining
- magnetic abrasive machining
- manual machining
- medium-duty machining
- minimum-manned machining
- mirror image machining
- multiaccess machining
- multiaxis machining
- multicell machining
- multiface machining
- multilateral machining
- multimachine machining
- multiple machining
- multiple setup machining
- multiple surface flow-line machining
- multiple-axis machining
- multiple-cutter machining
- multiple-electrode electrical discharge machining
- multiple-pass machining
- multiple-source laser machining
- multiple-workpiece machining
- multiplunge machining
- multipurpose machining
- multistage machining
- NC machining
- NF machining
- no-handwork machining
- nonturning machining
- numerical control machining
- numerically controlled machining
- off-center machining
- one-hit machining
- one-operation machining
- one-pass machining
- one-stop machining and grinding
- on-line machining
- parabolic machining
- parallel machining
- partially manned machining
- photochemical machining
- photon beam machining
- photonic machining
- pick feed traverse machining
- plasma-arc machining
- plasma-assisted machining
- plunge machining
- point-to-point machining
- post-process machining
- precision machining
- primary machining
- prismatic machining
- radial machining
- random flexible machining
- rapid machining
- rear-end machining
- RH machining
- rotary machining
- rotary transfer machining
- rotational machining
- rough machining
- roughing machining
- screw machining
- sculpture machining
- sculptured-surface machining
- secondary machining
- semifinish machining
- semi-fourth axis machining
- semiunmanned machining
- series machining
- side machining
- simultaneous fourth-axis machining
- single setup machining
- single-cutter machining
- single-pass machining
- single-point machining
- six-face machining
- six-sided machining
- slideway machining
- solids-based machining
- spark discharge machining
- spark erosion machining
- standalone machining
- straight production machining
- strip machining
- surface intersection machining
- Swiss machining
- Swiss-style machining
- tandem machining
- tapeless machining
- tapered machining
- templet-controlled machining
- test machining
- thermochemical machining
- three-axis curve machining
- three-axis machining
- three-dimensional machining
- tombstone machining
- toolroom machining
- torque-controlled machining
- total machining
- tracer machining
- transfer machining
- transfer-line machining
- trial machining
- turned part machining
- turning machining
- two-and-half axis machining
- two-at-a-time machining
- two-pass machining
- ultrafast machining
- ultrahigh speed machining
- ultrasonic abrasive machining
- ultrasonic machining
- ultrasonically assisted machining
- unattended machining
- unattended multiple-workpiece machining
- unmanned machining overnight
- unmanned machining
- unstable machining
- untended machining
- vertical machining
- vertical mode machining
- vibroabrasive machining
- waterjet machining
- waterjet-assisted machining
- wire electric discharge machining
- wire erosion machining
- wire machiningEnglish-Russian dictionary of mechanical engineering and automation > machining
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