Siemens SINUMERIK 828D Programming Manual page 295

Machining direction (G41/G42)
From this information, the control detects the direction, in which the tool path is to be
displaced.
Note
A negative offset value has the same significance as a change of offset side (
Working plane (G17/G18/G19)
From this information, the control detects the plane and therefore the axis directions for
compensation.
Example: Milling cutter
Program code
...
N10 G17 G41 ...
...
Note
On 2-axis machines, tool radius compensation is only possible in "real" planes, usually with
G18
Fundamentals
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
.
10.1 Tool radius compensation (G40, G41, G42, OFFN)
Comment
; The tool radius compensation is performed in the X/Y
plane, the tool length compensation is performed in the
Z direction.
Tool radius compensation
↔ ).
G41 G42
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