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INTRODUCTIONTOENGINEERING.ppt

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IntroductiontoEngineeringTolerancing–1:ControlofVariability&ReadingConstructionandWorkingDrawingsToleranceisthetotalamountadimensionmayvaryandisthedifferencebetweenthemax.andmin.limits.DirectlimitsandtolerancevaluesGeometricToleranceSystemToleranceSpecificationsinTitleBlockNotesreferringtospecificconditionsImportantTermsImportantTerms–singlepartLimits–maximumandminimumsizesshownbytolerances(.502and.498–largervalueistheupperlimitandthesmallervalueisthelowerlimit,fortheslot) Tolerance–totalallowablevarianceindimensions(upperlimit–lowerlimit)–objectdimensioncouldbeasbigastheupperlimitorassmallasthelowerlimitoranywhereinbetween ImportantTerms–MultiplePartsFittingTwoPartsShaftandHole–ClearanceandInterferenceFitsShaftandHoleFits–TransitionFitBasicHoleSystemBasicHoleSystem–ExampleCheckingyourworkForExampleAssignment