GD&T Dimensions and Tolerances

Dimension tolerances provide both a means of checking simple dimensional aspects of a part and also provide the base of reference for other checks that use a material modifier.

To add dimensional annotations you must have first set the Tolerance type, whether that be Limit (which provides the option to enter the low limit and high limit values explicitly) or Nominal +/- (which provides the option to enter the nominal value and the low and high deviation values from that nominal). These settings are saved with the annotation and used in the evaluation. The tolerance definition can then be edited in the annotation properties later dialog if needed.