Siemens SINUMERIK 808D Milling Programming And Operating Manual page 42

Setting-up
3.2 Setting up the workpiece
...
Rectangular workpiece measurement
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6. Traverse the tool, which has been measured previously, to approach
the workpiece in the X direction.
7. Switch to "HANDWHEEL" mode.
8. Select a suitable override feedrate, and then use the handwheel to
move the tool to scratch the required workpiece edge.
9. Select the offset plane to save in and the measuring direction (for
example, "G54" and "-").
10. Press this vertical softkey. The work offset of the X axis is calculated
automatically and displayed in the offset field.
11. Repeat the above operations to measure and set the work offsets in
the "Y" and "Z" axes respectively.
1. Select the desired operating area.
2. Switch to "JOG" mode.
3. Open the lower-level menu for workpiece measurement.
4. Press this vertical softkey to open the window for measurement of a
rectangular workpiece.
Programming and Operating Manual, 12/2012, 6FC5398-4DP10-0BA0
Milling Part 1: Operation