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G41 Cutter radius comp left / Tool nose radius comp left
Mitsubishi M70 M80 G-code · Mill, Lathe
On mills: Cutter radius comp left
Offsets the tool to the left of the path by the radius in the D offset. Climb milling on an outside profile.
Format
G41 D X Y
Addresses
| Address | What it does |
|---|---|
D | Radius offset number |
X Y | Lead in move |
How it works
Modal, group 07. Cancel with G40.
Example program
G00 X-1. Y-1. (START OFF PART)
G41 D01 G01 X0. F20. (COMP ON)
Y2. (PROFILE SIDE)
G40 G00 X-1. (COMP OFF)
G41 D01 G01 X0. F20. (COMP ON)
Y2. (PROFILE SIDE)
G40 G00 X-1. (COMP OFF)
Example is in inch. Check offsets and clearances first.
Watch out for
- Start on a straight lead in move longer than the tool radius.
- Mitsubishi looks ahead several blocks. Too many non-move blocks in a row can cause gouges or alarms.
On lathes: Tool nose radius comp left
Offsets the tool nose to the left of the path. Usually used for boring toward the chuck.
Format
G41 G01 X Z
Addresses
| Address | What it does |
|---|---|
X Z | Lead in move |
How it works
Modal, group 07. Cancel with G40.
Example program
G00 X.9 Z.1 (BORE START)
G41 G01 Z0. F.006 (COMP ON)
Z-1. (BORE)
G40 G00 X.8 (CANCEL)
G41 G01 Z0. F.006 (COMP ON)
Z-1. (BORE)
G40 G00 X.8 (CANCEL)
Example is in inch. Check offsets and clearances first.
Watch out for
- Set the tool nose radius and tip direction on the offset page or comp is wrong.
Related codes
G41 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Cutter compensation left |
| Haas NGC | Cutter compensation left |
| Mazak (EIA) | Cutter radius compensation left |
| Okuma OSP | Cutter radius compensation left |
| Brother Speedio | Cutter compensation left |
| Siemens 840D 828D | Tool radius compensation left |
| Heidenhain TNC (ISO) | Radius compensation left |
| Fagor 8055 8065 | Tool radius compensation left |
| LinuxCNC Tormach | Cutter compensation left |
| Mach3 Mach4 | Cutter comp left |
| Centroid CNC12 Acorn | Cutter compensation left |
| Hurco WinMax (NC) | Cutter compensation left |
| Fadal | Cutter radius compensation left, climb |
| Swiss (Citizen Star) | Nose radius compensation left |
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