Your Source for GD&T Training and Materials

Back to GD&T Tips

Cylindricity Inspection
   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.

Back to GD&T Tips