Siemens SINUMERIK 840D sl Programming Manual page 755

The actual activation is performed with G41 or G42 The tool radius compensation is
deactivated with G40.
Syntax
G41/G42 ORIC/ORID ISD=... CUT3DC/CUT3DCD CDOF2 X... Y... Z...
...
G40 X... Y... Z...
Meaning
CUT3DC:
CUT3DCD:
G41/G42 X... Y... Z... :
CDOF2:
ORIC/ORID:
ISD=<Value>:
G40 X... Y... Z... :
Note
The G commands for selecting the 3D TRC are evaluated in the approach block, i.e. typically
in the block that contains G41 or G42.
G41 or G42 can also be programmed in blocks without traversing movement in geometry axes
relevant for the compensation. In this case, the approach block is the first traversing block
following such a block.
A change of the 3D TRC variant with active tool radius compensation is ignored without alarm.
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
3D TRC for circumferential milling (only when 5-axis transforma‐
tion is active)
3D TRC in relation to a differential tool for circumferential milling
(only when 5-axis transformation is active)
The radius difference is specified by the tool parameter
$TC_DP15.
Activate tool radius compensation
Tool radius compensation left of the contour
G41:
Tool radius compensation right of the contour
G42:
Note:
The activation must be performed in a linear block (G0/G1).
Deactivate collision detection for 3D circumferential milling
The behavior for orientation changes at outside corners is speci‐
fied via the G commands ORIC and ORID.
Orientation changes at outside corners are superim‐
ORIC:
posed on the circle block to be inserted.
Orientation changes at outside corners are executed
ORID:
before the circle block to be inserted.
With the ISD address, the insertion depth of the tool can be
changed for circumferential milling and active 3D tool radius com‐
pensation.
Length of the insertion depth
<Value>:
Deactivate tool radius compensation
Note:
The deactivation must be performed in a linear block (G0/G1) with
geometry axis movements.
Work preparation
3.13 Tool offsets
755