Siemens sinumerik 840D sl Operating Manual page 100

Working in manual mode
3.3 Traversing axes
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3. Enter the desired value for the "Variable increment" parameter.
Example: Enter 500 for a desired increment of 500 μm (0.5 mm).
4. Press the <Inc VAR> key.
5. Select the axis to be traversed.
6. Press the <+> or <-> key.
Each time you press the key the selected axis is traversed by the set
increment.
Feedrate and rapid traverse override switches can be operative.
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
Turning