Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set User Manual
Page 489
Tool Control Functions
Chapter 20
20-5
G44
If the sum of the tool geometry and the tool wear is a negative offset
value, program G44.
For example:
If the values for tool offset no. 1 are:
Tool Geometry
-3.0000
Tool Wear
+0.1000
The tool offset is:
-2.9000
G49
To cancel the tool length offset function, program G49.
Figure 20.3
Tool Offset Data
Gauge line
L
TW
Current tool length
Initial tool length
L : Initial tool length
(Geometry offset)
TW : Amount of tool wear
(wear offset)
These G codes are modal, which means they are active from the program
block that they have been entered to either the end of the program or until
canceled. (They also belong to the same modal group.) However, the
system installer must select one of these G codes in AMP. This G code
would then be active during the entire program or until canceled. This
manual assumes that G49 has been selected in AMP.