Siemens SINUMERIK 840D, Operating Manual, Page: 77 / 610

Setting up the machine
2.6 Measuring the workpiece zero
Milling
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
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Press the "Select WO" softkey to select an adjustable work offset.
In the window "Work offset – G54 ... G599", select a work offset, in
which the zero point should be saved and press the "In manual"
softkey.
You return to the measurement window.
...
5. Use the softkeys to select in which axis direction you want to approach
the workpiece first.
6. Select the measuring direction (+ or -) you want to approach the
workpiece in.
For Z0, the workpiece is always approached in the Z minus direction.
7. In X0, Y0, or Z0, specify the setpoint position of the workpiece edge.
The setpoint position corresponds, e.g. to the dimension specifications
of the workpiece edge from the workpiece drawing.
8. Traverse the workpiece probe close to the workpiece edge that you
wish to measure and press the <CYCLE START> key in order to
measure the workpiece zero automatically.
Note
Settable work offsets
The labeling of the softkeys for the adjustable work offsets varies, i.e. the selectable work
offsets configured at the machine are displayed (examples: G54…G57, G54…G505,
G54…G599).
Please refer to the machine manufacturer's specifications.