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1、AboutFamilyTablesFamilyTablesarecollectionsofparts(orassembliesorfeatures)thatareessentiallysimilar,butdeviateslightlyinoneortwoaspects,suchassizeordetailfeatures.Forexample,woodscrewscomeinvarioussizes,buttheyalllookalikeandperformthesamefunction.Thus,itisusefultothinkofthemasafam
2、ilyofparts.PartsinFamilyTablesarealsoknownastable-drivenparts.Thefollowingfigureshowsafamilyofbolts.Thegenericisatthetopofthefigure,anditsinstancesareunderneath.Thegenericistheparent.UsingFamilyTables,youcan:·Createandstorelargenumbersofobjectssimplyandcompactly·Savetimeandeffortby
3、standardizingpartgeneration·Generatevariationsofapartfromonepartfilewithouthavingtore-createandgenerateeachone·Createslightvariationsinpartswithouthavingtouserelationstochangethemodel·CreateatableofpartsthatcanbesavedtoaprintfileandincludedinpartcatalogsFamilyTablespromotetheuseofs
4、tandardizedcomponents.TheyletyourepresentyouractualpartinventoryinPro/ENGINEER.Moreover,familiesmakeiteasytointerchangepartsandsubassembliesinanassembly,becauseinstancesfromthesamefamilyareautomaticallyinterchangeablewitheachother.FamilyTableStructureFamilyTablesareessentiallysprea
5、dsheets,consistingofcolumnsandrows.Theyconsistofthefollowingthreecomponents:1.Thebaseobject(genericobjectorgeneric)onwhichallmembersofthefamilyarebased.2.Dimensionsandparameters,featurenumbers,user-definedfeaturenames,andassemblymembernamesthatareselectedtobetable-driven(hereafterr
6、eferredtoasitems).3.Namesofallfamilymembers(instances)createdbythetableandthecorrespondingvaluesforeachofthetable-drivenitems.Rowscontaininstancesofpartsandtheircorrespondingvalues;columnsareusedforitems.Thecolumnheadingsincludetheinstancename,andthenamesofallofthedimensions,parame
7、ters,features,members,andgroupsthatwereselectedforthetable.Dimensionsarelistedbyname(forexample,d9)withtheassociatedsymbolname(ifany)onthelinebelowit(forexample,depth).Parametersarelistedbyname(dimsymbol).Featuresarelistedbyfeaturenumber(forexampleF107)withtheassociatedfeaturetype(
8、forexample[cut])orfeaturen
