Writing Traversing Programs
10-12
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Variants in tool offset
Tool offset is made up of two correction-value components:
S Tool length offset
The tool length offset is the actual tool length from tool zero to the tool tip.
S Tool length wear value
The tool length wear value allows the change in tool length due to wear to be
compensated in two ways:
Absolutely: by specifying a fixed wear value
Additively: by adding an “offset value” to the current tool length wear value
contents.
Tool new Tool wear a Tool wear b
Tool zero
D
L
D
Vabs
D
Vadd
D
V
Fig. 10-4 Tool offset
Notes to the figure:
The tool offset thus consists of the tool length compensation and the tool length
wear value:
D = D
L
− D
V
D
V
= D
Vabs
+ D
Vadd
D − Tool compensation
D
L
− Tool length compensation (positive or negative)
D
V
− Tool length wear value (positive or negative)
D
Vabs
− Wear, absolute (positive or negative)
D
Vadd
− Wear, additive (positive or negative)
If the additive wear is modified on-line, the FM computes the new absolute wear
and resets the additive wear to zero.
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