Tool offsets
7.11 Cutting data modification for tools that can be rotated (CUTMOD)
Job planning
448 Programming Manual, 07/2010, 6FC5398-2BP40-0BA0
Explanations:
In block
N180, initially the tool is selected for CUTMOD=0 and non-rotated toolholders that can be
orientated. As all offset vectors of the toolholder that can be orientated are 0, the position
that corresponds to the tool lengths specified in
$TC_DP3[1,1] and $TC_DP4[1,1] is
approached.
The toolholder that can be orientated with a rotation of 30° around the B axis is activated in
block
N200. As the tool nose position is not modified due to CUTMOD=0, the old tool nose
reference point is decisive just as before. This is the reason that in block
N210 the position is
approached, which keeps the old tool nose reference point at the zero (i.e. the vector (1, 12)
is rotated through 30° in the Z/X plane).
In block
N260, contrary to block N200 CUTMOD=2 is effective. As a result of the rotation of the
toolholder that can be orientated, the modified tool nose position becomes 8. The
consequence of this is also the different axis positions.
The tool radius compensation (TRC) is activated in blocks
N220 and/or N270. The different
tool nose positions in both program sections has no effect on the end positions of the blocks
in which the TRC is active; the corresponding positions are therefore identical. The different
tool nose positions only become effective again in the deselect blocks
N260 and/or N300.
Further information
Effectiveness of the modified cutting data
The modified tool nose position and the modified tool nose reference point are immediately
effective when programming, even for a tool that is already active. A tool does not have to be
re-selected for this purpose.
Influence of the active machining plane
To determine modified tool nose position, cutting direction and holder or clearance angle, the
evaluation of the cutting edge in the active plane (
G17 - G19) is decisive.
However, if setting data SD42940 $SC_TOOL_LENGTH_CONST (change of the tool length
component when selecting the plane), a valid value not equal to zero (plus or minus 17, 18
or 19), then its contents define the plane in which the relevant quantities are evaluated.
System variables
The following system variables are available:
System variables Significance
$P_CUTMOD_ANG /
$AC_CUTMOD_ANG
Supplies the (non-rounded) angle in the active machining plane, that was
used as basis for the modification of the cutting data (tool nose position,
cut direction, clearance angle and holder angle) for the functions
activated using
CUTMOD and/or $SC_CUTDIRMOD.
$P_CUTMOD_ANG refers to the actual state in the preprocessing,
$AC_CUTMOD_ANG to the actual main run block.
$P_CUTMOD /
$AC_CUTMOD
Reads the currently valid value that was last programmed using the
command CUTMOD (number of the toolholder that should be activated for
the cutting data modification).
If the last programmed CUTMOD value = -2 (activation with the currently
active toolholder that can be orientated), then the value -2 is not returned
in $P_CUTMOD, but the number of the active toolholder that can be
orientated at the time of programming.
$P_CUTMOD refers to the actual state in the preprocessing,
$AC_CUTMOD to the actual main run block.
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