Total Runout

Total runout is used to evaluate surfaces constructed around a datum axis it establishes a width variation normal to that surface. The evaluation zone is continuous providing a cumulative evaluation of deviations in circularity, straightness, coaxiality, taper, and profile relative to this axis.

Evaluation Process within SA:

  1. Measurements of the datum are fit to the datum feature to establish a nominal axis.

  2. These features are translated along the nominal axis as al- lowed by any additional datum constraints to minimize the maximum and minimum point deviations.

  3. The extent of the maximum point deviation relative to the surface normal is then doubled to define the diametric measured deviation and compared to the tolerance zone to report the result.