Siemens SINUMERIK 840D sl Programming Manual page 803

The data is always modified with respect to the corresponding tool parameters
($TC_DP2[..., ...] etc.) when the "Modification of the offset data for rotatable tools" function was
activated with the CUTMOD or CUTMODK command and the tool was rotated by an orientable tool
carrier or a suitable orientation transformation.
Further function-relevant system variables
System variable
$P_CUTMOD_ANG /
$AC_CUTMOD_ANG
$P_CUTMOD /
$AC_CUTMOD
$P_CUTMODK /
$AC_CUTMODK
$P_CUT_INV /
$AC_CUT_INV
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
Meaning
Returns the angle through which a tool was rotated in the active machining
plane and the modified cutting edge data available for the CUTMOD and
CUTMODK functions.
Reads the currently valid value that was last programmed with the CUTMOD
command (number of the tool carrier for which the modification of the offset
data should be activated).
If the last programmed value was CUTMOD = -2 (activation with the currently
active orientable tool carrier), then the value "-2" is not returned in the system
variable, but rather the number of the orientable tool carrier active at the time
of programming.
Reads the name of the transformation under which the currently valid data set
for the "Modification of the offset data" was created.
Supplies the value TRUE if the tool is rotated so that the spindle direction of
rotation must be inverted. To do this, the following four conditions must be
fulfilled in the block to which the read operations refer:
1. If a turning or grinding tool is active
(tool types 400 to 599 and / or SD42950 $SC_TOOL_LENGTH_TYPE = 2).
2. The modification of the offset data was activated with the CUTMOD
or CUTMODK command.
3. An orientable tool carrier or an orientation transformation defined with kin‐
ematic chains is active, which was selected with the CUTMOD or CUT‐
MODK command.
4. The tool is rotated by the orientable tool carrier or the kinematic orientation
transformation so that the resulting normal of the tool cutting edge is rota‐
ted with respect to the initial position by more than 90° (typically 180°).
If at least one of the specified four conditions is not fulfilled, the variable returns
the value FALSE. For tools whose cutting edge position is not defined, the
value of the variable is always FALSE.
Work preparation
3.13 Tool offsets
803