CNC Machinist Calculator UltraG41 Cutter compensation left / Tool nose radius compensation left
Fanuc G-code · Mill, Lathe
On mills: Cutter compensation left
Offsets the tool to the left of the programmed path, looking in the direction of travel, by the radius in offset D. With a right hand tool this is climb milling.
Format
Addresses
| Address | What it does |
|---|---|
D | Offset number holding the tool radius |
X Y | Lead in move that starts compensation |
F | Feed rate |
How it works
Modal, group 07. Cancel with G40.
Example program
G43 H08 Z.1 M08 (CLEARANCE)
G01 Z-.25 F10. (DEPTH)
G41 D08 X0. F20. (COMP ON, LEAD IN TO LINE)
…
The full 8-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Start compensation on a G00 or G01 move longer than the tool radius. Starting on an arc gives an alarm.
- D is the radius, not the diameter, unless a parameter is set for diameter.
- Two or more blocks without XY motion in comp mode can cause gouges or an alarm.
On lathes: Tool nose radius compensation left
Offsets the path to the left of the direction of travel by the nose radius. Normal for ID boring toward the chuck. Radius and tip direction come from the offset called by T.
Format
Addresses
| Address | What it does |
|---|---|
X Z | First move, used to bring compensation in |
How it works
Modal, group 07. Cancel with G40.
Example program
G96 S400 M03 (CSS)
G00 X1.2 Z.1 M08 (APPROACH BORE)
G41 G01 Z0 F.005 (COMP ON)
…
The full 8-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Enter the nose radius R and tip direction T in the offset page. A boring bar is usually tip 2.
- Tip 0 or a wrong tip number gives a wrong size on tapers and arcs.
- Turn it on with a move longer than the nose radius before touching the part.
Related codes
G41 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Haas NGC | Cutter compensation left |
| Mazak (EIA) | Cutter radius 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 |
Every G-code for Fanuc in your pocket. The app has the full example programs, search by number or shop word, a line decoder and calculators for tapping, threading and drilling.
Open G41 in the app All Fanuc G-codes