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1、ChapterSixREFERENCEELEMENTS64IfyourREFERENCEELEMENTStoolbarisnotinviewandnothidden,youcanretrieveitfromthetoolbarsmenuseenhere.65REFERENCEELEMENTSplayanimportantpartinanysolidmodeling.Withoutthem,youcanonlydoworktotheoutermostsurfacesofthepart,whichmaynotalwaysbepractic

2、alorinvolvealotofpre-drawplanning.66Tocarveastepintoyourpartwithoutsettingareferenceplane,youareverylimitedastowhereyoucanputit.Youmustfirstpickapartfacethatyouaregoingtoworkon.Thiswillunfortunatelybewhereyourstepwillbegin,likeitornot,withoutsettingaplane.67Onceyouhavee

3、nteredsketcher,youwilldrawtheshapeofthestepthatwillbeinyourpart.Noticeinthisexamplethatpartofthestepshapeextendsbeyondthepart.Thebitofshapethatisnotpartofthestepisofnoconsequenceatthispoint.Thismethodisthequickestandmostconvenientwayofcarvingoutastep…butkeepinmindthatif

4、ACCURACYisimportant,youmustconsiderhowmuchofthestepisoverhangingthepartinyouoverallcalculations.overhang68Oncebackin3Dmode,youcanseeSketch2inrelationtothepart.YoucannowPOCKEToutthisshapefromoneendtotheother,andanywhereinbetween.Wewillpocketit1inch.69Atthispointwehavehig

5、hlightedSketch2andpickedPocketfromtheDressUptoolbar.ThePocketDefinitiondialogboxpopsupforyoutoentertheinitialdepthofpocket.DepthofpocketNoticeinthedefinitionboxyoucanalso“mirror”thepocketforittogobothwaysor“reverse”it.Mirror(pick)70Herewehavethepartwiththepocketcutintoi

6、tmakingastep.Thisisconvenientifyouareonlyworkingonthefacesofthepart,butwhatifyouneedastepinthemiddleofoneedge?71Letstakethesameshapeandcarveastepintothemiddleofthefrontedge,leavingmaterialonbothsides.Forthiswearegoingtohavetodothesamethingsasbefore,onlyfirstwemustaddaRE

7、FERENCEELEMENT.72AReferenceElementisanotherplaneyoucanuseasareferenceforotherdrawingbitsonyourpart.Todothiswefirstpickthefacewewishtoreferencefrom,pickPLANEfromtheReferencetoolbar,andinthePlaneDefinitiondialogboxwewillenterhowfartheplaneshouldbefromthefaceweinitiallypic

8、ked.planeEnteroffset73Hereweseetheplanesetintoplaceandreadytobeusedasareferenceelement.74Tousethereferenceelem