HEIDENHAIN IK 5394-3D - Manual (Page 234)

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Chapter 3 Probes
Step 5
Select the desired edge algorithm.
Step 6
Select the desired edge type.
NOTE
Set the desired minimum contrast by entering a value in the min
contrast text box if a specific level is desired. Otherwise click
the teach button after selecting algorithm and edge type.
Step 7
Click on the teach button.