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When Inspecting Cylindricity, There Is No Datum
(In accordance with Y14.5M-1994 standard)

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Cylindricity is one of the more challenging tolerances to inspect. It requires isolating the feature from the rest of the part since there can never be a datum referenced with cylindricity. In this example, the cylindricity has been applied to 5 features. Cylindricity is an individual control. Therefore, each feature is inspected independent of the others. An electronic probe gathers many points on the surface. A computer then evaluates the points to fit them between two concentric cylinders that may not have a radial separation greater than 0.02. The actual size, location and orientation of the feature are ignored. Cylindricity is a composite of circularity, surface straightness and taper.

Back to Tips Tip added Dec 2004