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G41 Cutter radius compensation left / Tool nose radius compensation left
Mazak (EIA) G-code · Mill, Lathe
On mills: Cutter radius compensation left
Offsets the tool to the left of the path by the radius in offset D. Left in the direction of travel gives climb milling with a right hand cutter on outside contours.
Format
Addresses
| Address | What it does |
|---|---|
X Y | Lead in move that applies the offset |
D | Offset number that holds the radius |
How it works
Modal, group 07. Cancel with G40.
Example program
G43 H06 Z.1 (LENGTH OFFSET)
G01 Z-.25 F15. (TO DEPTH)
G41 X0. D06 F25. (COMP LEFT ON LEAD IN)
…
The full 7-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Apply it on a straight lead in move longer than the tool radius.
- On Mazak the radius may come from Mazatrol TOOL DATA or the offset table. Check which one is active.
- Moves without X or Y in the plane can cause overcut warnings.
On lathes: Tool nose radius compensation left
Offsets the path for the tool nose radius, tool on the left of the path. Used for ID boring toward the chuck on a normal front turret lathe.
Format
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 (START INSIDE)
G41 G01 X1. Z0. F.005 (COMP ON)
Z-1. (BORE)
…
The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- The nose radius and tip direction must be set in the tool data or the tool offset. Without them the comp does nothing.
- Apply it on a move before the first cut.
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 |
| Okuma OSP | Cutter radius compensation left |
| Mitsubishi M70 M80 | Cutter radius comp 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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