Siemens SINUMERIK 840D sl Programming Manual page 826

Work preparation
3.13 Tool offsets
G18 is active. Since <CorMode> = 3, the tool wear in the direction of the X axis of the WCS must
become zero once N100 has been executed.
The contents of the relevant tool parameters at the end of the program are thus:
$TC_DP3[1,1]: 21.830 ; geometry L1
$TC_DP4[1,1] : 21.830 ; geometry L2
$TC_DP12[1,1] : 2.500 ; wear L1
$TC_DP13[1,1] : -4.330 ; wear L2
The geometrical relationships are shown in the figure below: The total wear including
_CORVAL is mapped onto the X' direction in the WCS. This produces point P2. The
coordinates of this point (measured in X/Y coordinates) are entered in the geometry component
of the tool. The difference vector P
component in the direction of _CORVAL.
If the program example is continued after N110 with the following instructions, then the
remaining wear is included completely in the geometry because the compensation is now
effective in the Z' axis (parameter <GeoAx> = 0):
N120 _CORVAL[0]=0.0
N130 R1=SETTCOR(_CORVAL,"GW",0,3,0)
N140 T1 D1 X0 Y0 Z0 ; ==> MCS position X24.330 Y0.000 Z17.500
Since the new compensation value is "0", the total tool length and thus the position approached
in N140 may not change. If _CORVAL were not equal to "0" in N120, a new total tool length and
thus a new position in N140 would result, however, the wear component of the tool length would
always be zero, i.e. the total tool length is subsequently always contained in the geometry
component of the tool.
826
- P remains in the wear. The wear thus no longer has a
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Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming