Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual page 24

See the following illustration for determining the length offsets using the example of a drill: Length 1/Z axis
See the following illustration for determining the length offsets using the example of a milling tool:
Operating sequence
Measuring the tool in the X direction
1.
2.
3.
4.
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Select the desired operating area.
Switch to "JOG" mode.
Open the manual tool measurement window.
Press this vertical softkey to measure the tool in the X direction.
Programming and Operating Manual (Turning)
6FC5398-5DP10-0BA2, 06/2015