Siemens SINUMERIK 840D sl Function Manual page 107

The parameter $TC_CARR5 is assigned to the fine offset $TC_CARR45.
Note
For the significance of the system variables $TC_CARR41 to $TC_CARR65 available for the
fine offset see:
Further information
Programming Manual Advanced; Tool offsets
Activation
The following setting adds the fine offset values to the basic values:
SD42974 $SC_TOCARR_FINE_CORRECTION = 1 (fine offset TCARR on/off)
Boundary conditions
The amount is limited to the permissible fine offset.
The maximum permissible value is defined:
Components
● Components of vectors l
● Offsets of the two rotary axes v
An impermissible fine offset value is only detected upon occurrence of the following conditions:
● A tool carrier capable of orientation which has such a value is activated
● The following setting data is applied at the same time:
SD42974 $SC_TOCARR_FINE_CORRECTION
Description of a rotation
A data block for describing a rotation comprises one vector v
rotation of the rotary axis in its initial state and an angle α1/α2. The angle of rotation is counted
positively for clockwise rotation facing the direction of the rotation vector.
The two tool carrier angles α1 and α2 are determined using a frame, independent of the active
plane currently selected (G17 - G19).
The tool orientation in the initial state (both angles α1 and α2 are zero) is (as in the default case):
● G17: Parallel to Z.
● G18: Parallel to Y.
● G19: Parallel to Z
Assigning data to the toolholder
Example of a machine with rotary tool carrier
Tools
Function Manual, 06/2019, A5E47435126B AA
Machine data
MD20188 $MC_TOCARR_FINE_LIM_LIN
to l :
1 4
MD20190 $MC_TOCARR_FINE_LIM_ROT
and v :
1 2
2.8 Tool carriers with orientation capability
/v to describe the direction of
1 2
W1: Tool offset
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