Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 526)

Cutter Diameter Compensation
(G40, G41, G42)
Chapter 21
21-8
When which is: is active and is cutting:
G41 straight line to arc
(or arc to straight line)
greater than 90 degrees
but less than 180 degrees
G42 straight line to arc
(or arc to straight line)
greater than 180 degrees
but less than 270 degrees
Figure 21.6
Cutter Compensation Examples
G41
Programmed path
•
r
r
r
r
270
• • • • • •
•
G42
Programmed path
r
r
r
r
generated
Linear
block
•
G42
r
180
• • •
270
r
Programmed
path
Linear
generated
block
Programmed
path
+
Compensated path
necessary to cut arc
r
Compensated path
G41
•
90
• • •
180
Inside Angle
0
• • • • •
Outside Angle
Straight Line-to-Arc Straight Line-to-Arc
generated
Linear
block
generated
Linear
block