Answer / viswa

Runout is a composite control which results due to form,
orientation and location errors in a part. Runout is a
surface characteristic. It is always checked by rotating
the part about a datum axis and observing the full
indicator movement (FIM) of a dial indicator whcih is in
contact the the surface of the part. The tolerance zone of
runout error is a liner distance between two circles
concentric with the datum axis.

Concentricity, on the other hand, is only a locational
error of the axis of a feature with reference to the datum
axis. The tolerance zone is always cylindrical in case of
concentricity which is centered around the datum axis.
Concentricity in a plane is checked by finding the position
of the median points of the profile along different
orientations in that plane by using two dial indicators in
contact with the surface of the part and observing their
differential readings. All these readings should be less
than the specified concentricity tolerance.

Answer / sindhur

i am very confused with Runout & concentricity & total runout plz explain me with an example

Answer / prasanna

The difference between circular and total runout tolerances is that circular runout tolerances only apply to each cross-section separately while total runout is measured over the entire feature.
Runout tolerances are usually applied to parts that rotate around an axis of rotation which
constitutes datum and can generally be described as a tolerance for how much a surface may vary during one revolution.

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