The machine table with the clamped work part is
moved below the work spindle (in X and Y) in which
the reset tool is clamped.
Now the tool is recessed in Z direction to the work
part surface (X, Y plane), with the spindle switched on
(see figure 52), until a small marking is made on the
work part (touching the work part) surface.
After this the Z axis is reset and the Z value of the
work part zero point W is transferred and stored into
the CNC control using the IST key.