Wear Sign Evaluation - Siemens Sinumerik 840D sl Programming Manual

7.3.2

Wear sign evaluation

Function
When setting data SD42920 $SC_WEAR_SIGN_CUTPOS and SD42930 $SC_WEAR_SIGN
are set not equal to zero, then you can invert the sign evaluation of the wear components.
SD42920 $SC_WEAR_SIGN_CUTPOS
Setting data not equal to zero:
For tools with the relevant tool nose position (turning and grinding tools, tool types 400), then
the sign evaluation of the wear components in the machining plane depends on the tool nose
position. This setting data is of no significance for tool types without relevant tool nose
position.
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, 02/2011, 6FC5398-2BP40-1BA0
Length 1
X
X
X
Tool offsets
7.3 Special handling of tool offsets
Length 2
X
X
X
411