HEIDENHAIN IK 5394-3D - Manual (Page 526)

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Chapter 6 System Setup
Moving the datum on alignments
Until a datum is created by the user, machine zero is the datum used to display
features in the part view window. This can exclude the datum from view during
primary plane measurement and secondary alignment, depending on the prox-
imity of the part to machine zero as shown in this example.
The system can be configured to automatically move the datum to the center of
the primary plane, and then to the center of the secondary line as the user
creates a datum.