Siemens SINUMERIK 840D sl Programming Manual page 166

Geometry settings
8.2 Selection of the working plane (G17/G18/G19)
Note
In the default setting, G17 (X/Y plane) is defined for milling and G18 (Z/X plane) is defined for
turning.
When calling the tool path correction G41/G42 (see Chapter "Tool radius compensation
[Page 277]"), the working plane must be defined so that the controller can correct the tool
length and radius.
Example
The "conventional" approach for milling is:
1. Define working plane (G17 default setting for milling).
2. Select tool type (T) and tool offset values (D).
3. Switch on path correction (G41).
4. Program traversing movements.
Program code
N10 G17 T5 D8
N20 G1 G41 X10 Y30 Z-5 F500
N30 G2 X22.5 Y40 I50 J40
Further information
General
It is recommended that the working plane G17 to G19 be selected at the start of the program.
In the default setting, the Z/X plane is preset for turning G18.
Turning:
166
Comment
; Selection of working plane X/Y, call tool. Tool
length compensation is performed in the Z
direction.
; Radius compensation is performed in the X/Y plane.
; Circular interpolation/tool radius compensation in
the X/Y plane.
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals