Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 537)

Cutter Diameter Compensation
(G40, G41, G42)
Chapter 21
21-19
Figure 21.15
Exit Move Defined By An I, J, K Vector But Limited To Radius
Compensated path using I, J vector
Compensated path if no I, J in G40 block
Intercept line I, J
Programmed path
Compensated path
N10
N11
r
r
r
If the vector defined by I, J, and/or K is parallel to the programmed tool
path, the resulting exit move are offset in the opposite direction of the I, J,
K vector by one radius of the tool.
Figure 21.16
Exit Move When I, J, K Vector Parallel to Programmed Tool Path
Compensated path using I, J vector
Compensated path if no I, J in G40 block
Intercept line
I, J
Programmed path
Compensated path
r
r
r
Important: If one I, J, and/or K value is programmed without the second
one, the value of the second I, J, and/or K word defaults to 0.