Siemens SINUMERIK 840D sl Programming Manual page 459

In the following table, the dimensions, whose sign is inverted using SD42920 (not equal to
zero), are designed using an X:
Tool nose position
1
2
3
4
5
6
7
8
9
Note
The sign evaluation using SD42920 and SD42910 are independent of one another. If e.g.
the the sign of a dimension is changed using both setting data, then the resulting sign
remains unchanged.
SD42930 $SC_WEAR_SIGN
Setting data not equal to zero:
Inverts the sign of all wear dimensions. This affects both the tool length and other variables
such as tool radius, rounding radius, etc.
If a positive wear dimension is entered, the tool becomes "shorter" and "thinner", refer to
Chapter "tool offset, special handling", activating changed setting data".
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
Length 1
X
X
X
7.3 Special handling of tool offsets
Length 2
X
X
X
Tool offsets
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