Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 523)

Cutter Diameter Compensation
(G40, G41, G42)
Chapter 21
21-5
Example 21.2
Cutter Compensation Sample Paths
All of the following blocks result in the same tool path. Assume the
selected plane is the XY plane.
N1D1X0Y0;
N2G41X1Y1;
N3X2;
M30;
or
N1X0Y0F500;
N2G41X1Y1D1;
N3X2;
M30;
or
N1X0Y0F500;
N2G41;
N3X1Y1D1;
N4X2
M30;
Important: The cutter compensation feature is not available for any
motion blocks that are programmed in MDI mode (see section 21.6.5).
The cutter compensation mode may be altered by programming either G41,
G42, or G40; or the tool radius may be changed in an MDI program.
However, none of the tool paths executed in MDI is compensated. Any
changes made to cutter compensation are applied until the next block
executed in automatic mode.
The D--word calls the following data from the offset tables:
initial cutter radius data
cutter radius wear offset data
The sum of these two types of offset data is used by the control as the data
for the cutter compensation function.