Datum Hard Key; Example: Setting A Workpiece Datum; Preparation - HEIDENHAIN ND 522 - 2-2011 User Manual

Datum Hard key

See "Datum Hard key" on page 35 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 being used to touch the
workpiece.
Press the DATUM hard 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.
Touch the workpiece at point 1.
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