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ID:50327950
大小:11.13 MB
页数:31页
时间:2020-03-08
《机电专业英语 教学课件 作者 杨寿智 刘水平 机电专业英语.Lesson 4.ppt》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、Lesson4DialIndicatingInstrumentsTextMachinistsandtoolmakersfrequentlyusedialindicators.Dialindicatorsmakeitpossibletoquicklycheckcorrectalignmentofonemachinecomponentwithanotherandtocorrectlypositionworkpiecesinmachinetoolspriortomachining.Dialindicatinggage
2、sprovidepartsinspectorswitharapidandaccuratewaytochecklargequantitiesofnearlyidenticalparts.DialIndicatorsAdialindicator,Fig.4.1,showsvisuallytheamountoferror,insizeoralignment,forapartbeingmeasuredorpositionedasinFig.4.2.Metricdialindicatorsarecalibratedinh
3、undredthsofamillimeter(0.01mm),orintwothousandthsofamillimeter(0.002mm)units.Mostinchdialindicatorsarecalibratedinthousandthsofaninch(0.001”),andten-thousandthsofaninch(0.0001”),butinstrumentswithcalibrationsasfineasfifty-millionthsofaninch(0.000050”)areavai
4、lable.Therearetwocommontypesofdialindicators.Thebalancedtypehasfiguresinbothdirectionsfromthezero,asinFig.4.3.Thecontinuousreadingtypeisnumberedcontinuously,asinFig.4.9.Thebalancedtypeisthemorewidelyused.Generally,smallerdialindicatorsaremadewithasmallerrang
5、eoftravelthanlargerdialindicators.Travelisfrequentlylimitedtoonerotationofthedialpointer.Extendedtraveldialindicatorsareequippedwithasecondpointerwhichcountsthenumberofrevolutionsofthemaindialpointer,Fig.4.1.Thedialreadingmaybesetatzeroattimesimplybyrotating
6、theentiredialface.DialTestIndicatorSetsDialtestindicatorssetsaremadeforuseinawidevarietyofsetupandinspectionwork.ThesetshowninFig.4.3hasasteelbasewithT-slots,andacolumnclampedtothebaseforholdingthedialindicator.Thedialindicatorisfirstsettothepropergauginghei
7、ght.Thegaugingheightisthebasicdimensionoftheparttobegaugedortested.Thegaugingheightmaybeestablishedwithgageblocks,withaplanergagewhichissettotheproperheight,orwithanyappropriategaugingdevice.Thedialshouldbesetatzero.Itshouldbeundersufficientspringtensiontoal
8、lowthedialtorotateineitherdirectionthroughthedesiredmeasuringrange.InFig.4.2,thegaugingheighthasbeenestablishedbetweenthecontactpointandthesurfaceofthemachinetable.Afterthecorrectgaugingheightha
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