Setting the work part zero point is done with reference
to the machine zero point M of the CNC machine.
The machine zero point of a lathe is generally located
on the rotation axis of the main spindle on the plane
surface of the spindle flange on which the jaw chuck
is flanged (see figure 50).
Using the operation functions described below the
distance between the machine zero point M and the
work part zero point W is specified. This value zw,
also called the zero point shift, is then entered into the
CNC control.