Siemens SINUMERIK 840D sl Programming Manual page 278

Tool radius compensation
10.1 Tool radius compensation (G40, G41, G42, OFFN)
Note
In the NC block with G40/G41/G42, G0 or G1 has to be active and at least one axis has to be
specified on the selected working plane.
If only one axis is specified on activation, the last position on the second axis is added
automatically and traversed with both axes.
The two axes must be active as geometry axes in the channel. This can be achieved by
means of GEOAX programming.
Examples
Example 1: Milling
Program code
N10 G0 X50 T1 D1
N20 G1 G41 Y50 F200
N30 Y100
...
278
Comment
; Only tool length compensation is activated. X50 is
approached without compensation.
; Radius compensation is activated, point X50/Y50 is
approached with compensation.
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals