When
Inspecting Cylindricity, There Is No Datum
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.
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