- [Instructor] Runout controls the tolerances
of cylindrical surfaces, as these
features are rotated around a given datum axis.
Basic runout controls how much
a particular circular element of a feature
varies with respect to a given datum
when the part is rotated around that datum's axis.
Runout controls the wobble of a rotating element.
It can be used to set limits on the cumulative effects
of circularity and coaxiality.
Total runout controls how much the entire
surface of a cylindrical feature varies
with respect to a given datum, when the part
is rotated around that datum's axis.
Total runout controls both wobble and flatness
of a rotating element.
It can be used to set limits on the cumulative effects
of cylindricity and coaxiality.