机电一体化专业英语PPT

机电一体化专业英语（第2版）EnglishforElectromechanicalIntegration（II）ContentsUnit5Unit4Unit3Unit2Unit1Unit10Unit9Unit8Unit7Unit6Unit1LatheAccessories长春汽车工业高等专科学校PassageALatheAccessoriesBrassRoundStock(铜质圆料)Brassisanicematerialtoworkwith,thoughsomewhatexpensivecomparedwithaluminumorsteel.Itcanaddanicetouchofcontrastingcolortoaprojectthatwillbedisplayed.Thealloymostoftenusedforhomeshopworkis360.Unit1CenterDrills(中心钻)Centerdrillsarestiff,stubbylittledrillsusedtostartholesintheendofwork-piece.Ifyoutrytodrillaholeinawork-piecewithoutusingacenterdrill，youwillfindthatthedrillwillmostlikelywobbleoffcenterandnotdrillstraightintothework-piece.Standarddrillingpracticeistofirstmakeafacingcutontheendofthework-piece,thendrillastarterholeusingacenterdrillandthendrilltheholetotherequireddepthwithastandarddrill.PassageAUnit1ChipBrushes(清屑刷)Chipbrushesareinexpensivepaintbrushesthatarehandyforallkindsofusesaroundtheshop.We’renotsurewherethenameoriginated,butwedon‘tthinkithadanythingtodowithremovingchips;neverthelessthisisoneoftheusesthesebrushesexcelat.Theyarealsoidealtocleanthepackinggreaseoffanewlatheormill.Incidentally,experiencedmachinistswilltellyoualwaystouseabrush,ratherthancompressedair,tocleanthechipsfrommachinetoolsascompressedairwilldrivethechipsdeepintotherecessesofthemachine.Chipbrushesarethepreferredwaytocleanupchips.PassageAUnit1DigitalCaliper(数显卡尺)DigitalcalipersareusedjustlikedialcalipersformakinginsideandoutsidemeasurementsaccuratetoonethousandthofaninchbuthaveadirectLCDdigitalreadout.Onadialcaliperyoufirstreadthemajordimensiontothenearesttenthofaninchfromtheslideandmentallyaddtothattheminordimensionfromthedialtothenearestthousandth.Thisbecomessecondnatureafterawhile,butstillintroducesopportunitiestomakeamistake.Adigitalcaliperreadsoutthefulldimensiononthedisplay,soisprettyfoolproof,aslongasitisproperlyzeroed.Youcanalsoswitchbetweenmetricandinchmodesasneeded.DialCaliper(带表卡尺)DigitalCaliper(数显卡尺)PassageAUnit1PassageADrillRod(钻杆)Drillrodisasteelalloywithashinysilverycolorandgoodmachiningproperties.Unlikeotherrawmaterials,whichmayvaryfromthenominaldiameterby+.010ormore,drillrodissurfacegroundtowithinabout.001ofthenominaldiameter.Whilenotclassifiedasastainlesssteel,drillrodismoderatelyresistanttorust-more,atleast,thanordinarycarbonsteels.Itisgreatforapplicationssuchasshaftsandaxles.Ausefulpropertyofdrillrodisthatitcaneasilybehardenedbyheatingtoaredhotstateandthenquenchinginoilorwater.Thustreated,themetalishardenoughtousefortoolssuchaspunches.DrillSets(成套钻头)Drillingisoneofthemostcommonlyperformedoperationsonthelathe,soyouwillneedagoodcollectionofdecent-qualitydrills.Whenyoubuyyourlathe,don'tforgettoorderatailstockchuckandarbortoholdthedrills.Poorqualitydrillsareeasytofind,buttheyaretrulyawasteofmoney.That‘snottosaythatyouneedtobuytopqualityindustrialdrills.It’snotalwayseasytotellagooddrillbitfromapooronejustbylookingand,ofcourse,itsevenharderifallyouhaveisapictureonawebsiteorinacatalog.Generally,though,thelowestpriceddrillsetsaretheonestostayawayfrom.Unit1PassageAFaceplate(花盘)Afaceplateisahandyaccessoryforturningodd-shapedworkthatcannoteasilybeheldinachuck.Whileit'snottoodifficulttomakeyourownfaceplatefromsteeloraluminum,atthispriceit'shardlyworththeeffort.Aftermountingthefaceplateonthespindle,itisstandardpracticeforfaceplatestotakealightone-timefacingcuttoensurethatthefaceoftheplateissquarewiththelathe.Castirondustisveryharmfultobreathe,soIstronglyrecommendwearingadustmaskduringthisoperationanduntilyouhavevacuumeduptheresultingdust.Whenusingafaceplate,alwaysensurethattheworkissecurelyclampeddownandbalancedbysomeoffsettingpieceofmetal,ifnecessary.(Figure1-7)Unit1PassageAFeelerGages(塞尺)Feelergagesaresetsofthinsteelstripsofaccuratethicknesses,typicallyfrom.001uptoabout.040orso(Figure1-8).Therearetypicallyabout20to40separatestripsinaset,joinedtogetherbyaboltthatrunsthroughaholeintheendofeachgage.Eachgagehasthethicknessmarkedonit,inbothinchesandmmintheexamplebelow.Alloftheleavesfoldupintothehandletoprotectthemfrombendingwhenthey'renotinuse.Whiletheirintendedpurposeistomeasurethegapbetweentwosurfaces,suchastheelectrodesofsparkplug.Unit1PassageAFollowerRest(跟刀架)Afollowerrestissimilartoasteadyrest,butisattachedtoandtravelswiththecarriagetoprovideamovingsupportfortheworkbehindthecuttingtool.Thisisveryhandywhentryingtoturnlimberworkwhichwouldotherwisebowoutawayfromthetool.Ifyouhaveeverwonderedaboutthetwoscrewholesontheleftedgeofthecarriage,nowyouknowwhattheyarefor-theyarethemountingholesforthefollowerrest.Unit1Notes1.Centerdrillsarestiff,stubbylittledrillsusedtostartholesintheendofwork-piece.本句是个简单句。句中usedtostart…是后置定语，修饰stubbylittledrills。全句可译为：中心钻是坚硬的、粗而短的小型钻头，用于在工件端面开孔。2.DigitalcalipersareusedjustlikedialcalipersformakinginsideandoutsidemeasurementsaccuratetoonethousandthofaninchbuthaveadirectLCDdigitalreadout.本句稍长，但它是一个并列句。句中“but”为连词，译为“而且”。全句可译为：数显卡尺就像带表卡尺一样，被用来实现千分之一英寸的内外精确测量，而且带有一个液晶显示器。3.Aftermountingthefaceplateonthespindle,itisstandardpracticeforfaceplatestotakealightone-timefacingcuttoensurethatthefaceoftheplateissquarewith