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1、SimplePartingSurfaceClayGuideRev.4SimplePartingSurfaceWorkflow:Usingclayasaguidesurface.Thisdocumentsoutlinesanintriguingprocessforbuildingasimplepartingsurfaceformolduse,byusingclayastheconstructionmethod(withallitsflexibilityandlackofrules),butresultinginasimpletrimmedNUR
2、BSsurfaceforpreciselyedgedproductionuse.Thereareseveralwaystoimproveonthefollowingsteps,butthisisagoodfirststart.First,determineaninitialpartingsolutionwithPartingLineColorsandcreateaNURBScurveonthis.Itdoesn’tneedtobetooexact,asitisnotthefinalNURBSpartingcurveatthispoint,si
3、mplyaguide.Copyright2004SensAbleTechnologiesAllrightsreservedSimplePartingSurfaceClayGuideRev.4Next,useoffsetcurvetocreateaninnerandouterparallelcurvetothepartinglinecurves.Thiswillhelpcontrolthewidthoftheflatareaofthepartingsurfacealongtheedgeofthecavity.Itiscriticalatthis
4、stagetosimplifytheresultinginsideandoutsideoffsetcurves.Dothisbyreducingthenumberofpointsineachofthecurvesbyatleastathird(forexampleonacurvesegmentwith47,makeit12to15).Eachcurveloopshouldalsobejoinedtogetherfurtheriftheresultingoffsetcreatedlotsoflittlefragments.Sortthesefr
5、agmentsoutbyjoiningthemintotheloopordeletingthementirely.Remember,thesearesimplyboundariesforsurfaceswhichwillflowacrossthepartinglineandthesimplertheyare,thebeetertheresultingpatcheswillbe.Copyright2004SensAbleTechnologiesAllrightsreservedSimplePartingSurfaceClayGuideRev.4
6、FilltheareabetweenthecurvesandtheinteriorwithsimpleNURBSpatches.Itdoesn’thavetobetooprecise,itisjustbeingusedasaguide.Becarefulthoughtotryandmaintaintheflatarea,whichparallelsthepartingline.Copyright2004SensAbleTechnologiesAllrightsreservedSimplePartingSurfaceClayGuideRev.4
7、Next,exportthepatchesasIGES,andimportthemasanewpiece,usingthe“FilltoPlane”option.GiveitareasonabledepthinZ,butrememberthatweareonlygoingtousethefrontsurfaceofthispieceforourpartingsurfaceguide.(Note:ItisalsopossibletouseConvertPatchtoClayintheMGTtoolsofversionFFMP8.2forthis
8、methodofcreatingtheclayguidesurface.)Copyright2004SensAbleTechnologiesAllrightsres