HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 284)

284 Manual operation and setup
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11.4 Datum setting without a 3-D
touch probe
Note
You fix a datum by setting the TNC position display to the coordinates
of a known position on the workpiece.
Preparation
 Clamp and align the workpiece
 Insert the zero tool with known radius into the spindle
 Ensure that the TNC is showing the actual position values
Datum setting with a 3-D touch probe: (see "Datum
setting with a 3-D touch probe" on page 303).