Datum Soft Key - HEIDENHAIN ND 780 Handbuch

Datum Soft Key

See "Datum Soft Key" on page 44 for basic information. Datum
settings define the relationships between the axis positions and the
display values. For most lathe operations there is only one X-axis
datum, the center of the chuck, but it may be helpful to define
additional datums for the Z-axis. The table can hold up to 10 datum
points. The easiest way to set datum points is to touch a workpiece at
a known diameter or location, then enter that dimension as the value
that the display should be showing
Example: Setting a workpiece datum
Axis sequence in this example: X - Z
Preparation:
Call the tool data by selecting the tool which you are using to touch the
workpiece.
Press the DATUM soft key.
The cursor will be in the Datum Number field.
Enter the datum number and press the DOWN
ARROW key to go to the X Axis field.
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I Operating Instructions