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1、21_______________________DifferencesbetweenISOStandardsandotherStandards21.1ASMEY14.5M–1994,ANSIB89.3.1InthefollowingtheterminologyofASMEY14.5isused(seeTable21.3).21.1.1SymbolsTheNationalStandardoftheUnitedStatesofAmericaASMEY14.5M–1994specifiesinaddi
2、tiontoordeviatingfromISO1101thesymbolsanddrawingindicationsshowninTables21.1and21.2.Table21.1SymbolsaccordingtoASMEY14.5M*NotspecifiedinASMEY14.5MbutusualinUSpractice.327328GeometricalDimensioningandTolerancingforDesign,ManufacturingThesymbol“CZ”isnot
3、standardizedaccordingtoASMEY14.5.WhenitisusedindrawingsreferencedtoASMEY14.5thereferencetoISO1101shouldalsobeintro-ducedintothedrawingtitleblock,togetherwiththeremark:IncasesofcontradictionASMEY14.5applies.21.1.2RulesASMEY14.5Mdeviatesinsomerulesfromt
4、hespecificationsgivenintheISOStandards.ASMEY14.5Mspecifiesthefollowingrules:Rule#1:Whereonlyatoleranceofsizeisspecified,thelimitsofsizeofanindividualfeatureprescribetheextenttowhichvariationsinitsgeometricalform,aswellassize,areallowed.Inotherwords,fo
5、rindividualfeaturesofsizetheenveloperequirementapplieswith-outdrawingindication.Exceptionsareasfollows:●stockmaterials(suchasbars,sheets,tubing,structuralshapes)forwhichstraight-ness,flatnessorothergeometricaltolerancesarestandardizedandwhichremainint
6、he“as-furnished”conditiononthefinishedpart;Table21.2DrawingindicationsaccordingtoASMEY14.5MDifferencesbetweenISOstandardsandotherstandards329●(non-rigid)partssubjecttofreestatevariationintheunrestrainedcondition(see12);●featureswithastraightnesstolera
7、ncetotheaxisoraflatnesstolerancetothemedianface.Featureswithstraightnesstolerancestothegeneratorlinesarenotexceptions.Theenveloperequirementappliesaswellasthestraightnesstolerance.Bothrequirementshavetoberespected.Rule#1appliesonlytoindividualfeatures
8、ofsize.Theruledoesnotapplytodevia-tionsoforientationorlocationorrun-outofonefeaturerelatedtoanotherfeature.Rule#1issimilartothedrawingtitleboxindicationISO2768…EandtotheGermanStandardDIN7167.ThedifferenceisthatASME14.5Mrule#1excludesalsothosef
