Wear Sign Evaluation - Siemens SINUMERIK 840DE Programming Manual

Tool offsets
8.17 Special handling of tool offsets
The wear values are not mirrored. If these are also to be mirrored, setting data
$SC_MIRROR_TOOL_WEAR must be enabled.
SD 42910 MIRROR_TOOL_WEAR
Setting data not equal to zero:
The wear values of the tool length components, whose associated axes are mirrored, are
also mirrored - by sign inversion.
8.17.2

Wear sign evaluation

Function
Set setting data SD 42920 WEAR_SIGN_CUTPOS und SD 42930 WEAR_SIGN not equal to
zero can be used to invert the sign evaluation of the wear components.
Parameters
SD 42920 WEAR_SIGN_CUTPOS
Setting data not equal to zero:
In the case of tools with a relevant tool point direction (turning and grinding tools, tool types
400), the sign evaluation of the wear components depends on the tool point direction in the
machining plane. This setting data has no effect with tool types, which do not have a relevant
tool point direction.
In the following table, the dimensions whose sign is inverted by SD 42920 (not equal to 0)
are marked with an X:
Length of cutting edge
1
2
3
4
5
6
7
8
9
Note
The sign settings of SD 42920 and 42910 are independent. For example, if the sign of a
dimensional parameter is changed by both setting data, the resulting sign is unchanged.
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Length 1
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X
X
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Length 2
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X
X
Fundamentals