Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 530)

Cutter Diameter Compensation
(G40, G41, G42)
Chapter 21
21-12
If the next programmed move is circular (an arc), the tool is positioned at
right angles to a tangent line drawn from the start-point of that circular
move.
Figure 21.10
Tool Path for Entry Move Straight Line-to-Arc
0
• • •
90 90
• • •
180
270
• • •
360
180
• • •
270
G41
Programmed
path
G42
G41
Programmed
path
G42
G41
Programmed
path
G42
G41
Programmed
path
G42
Start-point
Start-point
Start-point
Start-point
•
•
•
•
r
r r
rr
r
r
r
r
There is no limit to the number of blocks that may follow the programming
of G41 or G42 before an entry move takes place. The entry move is
always the same regardless of the number of blocks that do not program
motion in the current plane for compensation.