gd&t tips - runout - vs concentricity

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Your Source for GD&T Training and Materials Back to GD&T Tips Runout vs Coaxiality (Concentricity) When in Doubt Use Runout! Avoid specifying concentricity. Concentricity requires deriving the median line of a feature. All of the features shown below are concentric. Usually, designs require that a feature be round as well as concentric like example A. A better geometric control is usually circular runout. Circular runout controls circularity (roundness) as well as concentricity. Back to GD&T Tips Home GD&T

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  • YourSourceforGD&TTrainingandMaterials

    BacktoGD&TTipsRunoutvsCoaxiality(Concentricity)WheninDoubtUseRunout!

    Avoidspecifyingconcentricity.Concentricityrequiresderivingthemedianlineofafeature.Allofthefeaturesshownbelowareconcentric.Usually,designsrequirethatafeatureberoundaswellasconcentriclikeexampleA.Abettergeometriccontrolisusuallycircularrunout.Circularrunoutcontrolscircularity(roundness)aswellasconcentricity.

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