Circular And Total Runout

Definition

A runout tolerance specifies how far the actual surface or feature is permitted to deviate from the desired form given in a drawing when you do a full rotation of the part on a datum axis. There are two types of runout: circular and total runout.

Tolerance Zone

A total width zone bounded by two boundaries of revolution within which: 

– Circular Runout: all points of each circular element (cross-section) of the considered feature must lie regardless of the size of the considered feature.

- Total Runout: all points of the entire surface of the considered feature must lie

Circular Runout -

regardless of the size of the considered feature. cylinder.

Total Runout - Measured over the entire length of the measured cylinder.

In Total Runout all points of the entire surface of the measured feature must lie regardless of the size of the measured feature.

This is an excerpt from The CMM Handbook v7