机电一体化专业英语教学课件 作者 黄星 夏玉波 Unit 1.ppt

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1、BasicMechanicalTechnologyPartITechnicalandPracticalReadingBrassRoundStockBrassisanicematerialtoworkwith,thoughsomewhatexpensivecomparedwithaluminumorsteel.Itcanaddanicetouchofcontrastingcolortoaprojectthatwillbedisplayed.Thealloymostoftenusedforhomeshopworkis360PassageALatheAccessories(I)CenterD

2、rillsCenterdrillsarestiff,stubbylittledrillsusedtostartholesintheendofwork-piece.Ifyoutrytodrillaholeinawork-piecewithoutusingacenterdrillyouwillfindthatthedrillwillmostlikelywobbleoffcenterandnotdrillstraightintothework-piece.Standarddrillingpracticeistofirstmakeafacingcutontheendofthework-piec

3、e,thendrillastarterholeusingacenterdrillandthendrilltheholetotherequireddepthwithastandarddrillChipBrushesChipbrushesareinexpensivepaintbrushesthatarehandyforallkindsofusesaroundtheshop.We’renotsurewherethenameoriginated,butwedon'tthinkithadanythingtodowithremovingchips;neverthelessthisisoneofth

4、eusesthesebrushesexcelat.Theyarealsoidealtocleanthepackinggreaseoffanewlatheormill.Incidentally,experiencedmachinistswilltellyoualwaystouseabrush,ratherthancompressedair,tocleanthechipsfrommachinetoolsascompressedairwilldrivethechipsdeepintotherecessesofthemachine.Chipbrushesandashopvacarethepre

5、ferredwaytocleanupchips.DigitalCaliperDigitalcalipersareusedjustlikedialcalipersformakinginsideandoutsidemeasurementsaccuratetoonethousandthofaninchbuthaveadirectLCDdigitalreadout.Onadialcaliperyoufirstreadthemajordimensiontothenearesttenthofaninchfromtheslideandmentallyaddtothattheminordimensio

6、nfromthedialtothenearestthousandth.Thisbecomessecondnatureafterawhile,butstillintroducesopportunitiestomakeopportunitiestomakeamistake.Adigitalcaliperreadsoutthefulldimensiononthedisplay,soisprettyfoolproof,aslongasitisproperlyzeroed.Youcanalsoswitchbetweenmetricandinchmodesasneeded.DrillRodDril

7、lrodisasteelalloywithashinysilverycolorandgoodmachiningproperties.Unlikeotherrawmaterials,whichmayvaryfromthenominaldiameterby+.010ormore,drillrodissurfacegroundtowithinabout.001ofthenominaldiameter.Whilenotclassifiedasastai