HEIDENHAIN ND 522 - Manual (Page 29)

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I - 2 Gener
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1/2 Hard key
The 1/2 hard key is used to find the half-way (or midpoint) between
two locations along a selected axis of a workpiece. This can be
performed in either Incremental, or Absolute mode.
Example: Finding the midpoint along a selected axis
X dimension: X = 100 mm
Midpoint: 50 mm
Move tool to first point.
SET ZERO soft key must be set to Zero.
Select the X axis key and
move to second point.
Press 1/2 hard key, then press the X axis key, and
move until zero is reached. This is the midpoint
location.
This feature will change datum locations when in Absolute
mode.
MOVE TO 1ST POINT
ZERO AXIS, AND MOVE TO 2ND POINT
PRESS 1/2, AND MOVE TO ZERO