Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 570)

Cutter Diameter Compensation
(G40, G41, G42)
Chapter 21
21-52
Figure 21.48
Typical Backwards Motion Error
Programmed
Path
A
Compensated
Path
Compensated path
motion opposite of
programmed path
C B
D
A’ D’
B’ C’
Circular Departure Too Small
This error is generated when the cutter radius is larger than the radius of
the programmed arc. Note this form of compensation error cannot be
disabled with an M-code. Programming this contour with tool tip radius
compensation on always generates an error.
Figure 21.49
Typical Circular Departure Error
Cutting Tool
This arc cannot be cut because
the radius of the programmed
arc is smaller than the radius of
the tool.
Programmed
path