HEIDENHAIN IK 5394-3D - Manual (Page 378)

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Chapter 5 Tolerancing & Templates
Circularity/sphericity tolerance (circles, spheres)
Use circularity/sphericity as form tolerance for circles and spheres. This toler-
ance defaults to circularity when the selected feature is a circle and sphericity
when the selected feature is a sphere. A minimum of four points is required for
a circularity tolerance and five points for a sphericity tolerance. The more
points used in the tolerance the more accurate the final result.
To perform a circularity tolerance
Step 1
Highlight the desired feature in the features list.
NOTE
Use a circle only. Circularity tolerances do not apply to other
types of features.
Step 2
Click the circularity/sphericity button on the tolerance toolbar.
Step 3
Enter a value in the tolerance zone box as shown.
CAUTION
Enter tolerance values in the appropriate units of measurement.
For example, if you are measuring in metric (mm) enter tolerance
data in metric (mm).