In the following table, the dimensions, whose sign is inverted using SD42920 (not equal to
zero), are designed using an X:
Cutting edge position Length 1 Length 2
1
2 X
3 X X
4 X
5
6
7 X
8 X
9
Note
The sign evaluation using SD42920 and SD42910 are independent of one another. If, for
example, 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".
3.13.3.3 Coordinate system of the active machining operation (TOWSTD, TOWMCS, TOWWCS,
TOWBCS, TOWTCS, TOWKCS)
Depending on the kinematics of the machine or the availability of an orientable tool carrier, the
wear values measured in one of these coordinate systems are converted or transformed to a
suitable coordinate system.
Coordinate systems of active machining operation
The following coordinate systems produce tool length offsets which the tool length wear
component incorporates in an active tool via the corresponding G command of Group 56:
● Machine coordinate system (MCS)
● Basic coordinate system (BCS)
● Workpiece coordinate system (WCS)
● Tool coordinate system (TCS)
● Tool coordinate system of kinematic transformation (KCS)
Work preparation
3.13 Tool offsets
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0 747
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