Siemens SINUMERIK 802D sl Programming And Operating Manual page 268

Programming
10.6 Tool and tool offset
Starting the compensation
The tool approaches the contour on a straight line and positions itself vertically to the path
tangent in the starting point of the contour.
Select the start point so as to ensure collision-free traversing.
Figure 10-37 Start of the tool radius compensation with the example G42, tool point direction =3
Information
As a rule, the block with G41/G42 is followed by the block with the workpiece contour.
However, the contour description may be interrupted by an intervening block that does not
contain information for the contour path, e.g. only M command.
Programming example
N10 T... F...
N15 Y... Z...
N20 G1 G42 Y... Z...
N30 Y... Z... ;
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; P0 - starting point
; Selection right of contour, P1
; Starting contour, circle or straight line
Programming and Operating Manual, 11/2012, 6FC5398-5CP10-3BA0
Surface grinding