HEIDENHAIN IK 5394-3D - Manual (Page 216)

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Chapter 3 Probes
Circle probe
Use the circle probe to find the diameter and center XY coordinates of a circle or
arc. The circle probe is also used in calibration procedures.
To create a circle probe
Step 1
Click on the new probe tool button on the VED toolbar.
Step 2
Click at two points along the circle edge as shown.