surface grinding operations - m m robinson high school e ：表面研磨操作- m m鲁滨孙高中e

《surface grinding operations - m m robinson high school e ：表面研磨操作- m m鲁滨孙高中e》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、SurfaceGrindingOperationsUnit82ObjectivesSetupvariousworkpiecesforgrindingObservethesafetyrulestooperatethegrinderGrindflat,vertical,andangularsurfaces2SurfaceGrindingPrimarilyforgrindingflatsurfacesonhardenedorunhardenedworkpiecePerformoperationssuchasform,angular,

2、andverticalgrindingGoodresultsdependonseveralfactors:PropermountingProperwheelselectionforjob3MountingWorkpieceforGrindingFlatWorkorPlatesRemoveallburrsfromsurfaceofworkCleanchucksurfacewithcleanclothPlacepieceofpaperslightlylargerthanworkpieceincenterofmagneticchu

3、ckfacePlaceworkontopofpaper,andbesuretostraddleasmanymagneticinsertsaspossibleIfworkpiecewarped,shimworktopreventrockingTurnhandletoonpositionCheckworktoseeitisheldsecurely4ThinWorkpiecesTendtowarpbecauseofheatcreatedduringgrindingMinimizebymountingworkpieceatangle

4、of15ºto30ºfromsideofchuckReduceslengthoftimewheelincontactwithworkUseadapterifavailableandmountworkatanangle5ShortWorkpiecesWorkthatdoesnotstraddlethreemagneticpolesgenerallynotheldfirmlyenoughforgrindingAdvisabletostraddleasmanypolesaspossibleSetparallelsorsteelpie

5、cesaroundworktopreventitfrommovingParallelsshouldbeslightlythinnerthanworkpiece6GrinderSafetyBeforemountingagrindingwheel,ringtestwheeltocheckfordefectsBesuregrindingwheelproperlymountedonspindleSeewheelguardcoversatleastone-halfwheelMakesuremagneticchuckhasbeenturn

6、edonbytryingtoremovework7SeethatgrindingwheelclearsworkbeforestartinggrinderBesuregrinderoperatingatcorrectspeedforwheelbeingusedWhenstartinggrinder,alwaysstandtoonesideofwheelNeverattempttocleanmagneticchuckormountandremoveworkuntilwheelhasstoppedcompletelyAlwayswe

7、arsafetyglasseswhengrinding8ProceduretoGrindaFlat(Horizontal)SurfaceRemoveallburrsanddirtfromworkpieceandfaceofmagneticchuckMountworkonchuck,placingpieceofpaperbetweenchuckandworkpieceChecktoseethatworkheldfirmlySettablereversedogssocenterofgrindingwheelclearseachen

8、dofworkby1in.9Setcrossfeedfortypeofgrindingoperation–roughingcuts,.030to.050in.;finishingcuts,.005to.020in.Bringworkundergrindingwheelbyha