Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 540)

Cutter Diameter Compensation
(G40, G41, G42)
Chapter 21
21-22
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 21.19
Tool Path For Entry Move Straight Line-to-Arc
0
• • •
90
90
• • •
180
Programmed path
G41
G42
Start-point
Start-point
Programmed path
G42 G41
180
• • •
270
270
• • •
360
Start-point
Start-point
Programmed
Path
G42 G41
•
•
•
•
Programmed path
G41
G42
r
r
r r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
G39 (Linear Generated Blocks)
G39 (Linear Generated Blocks)
G39.1 (Circular Generated Block)
0
• • •
90
Programmed path
G41
G42
Start-point
•
r
r
r
G39.1 (Circular Generated Block)
270
• • •
360
Start-point
•
Programmed path
G41
G42
r
r
r