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G91 Incremental mode
Mach3 Mach4 G-code · Mill
Axis values are distances from the current position.
Format
G91
Addresses
| Address | What it does |
|---|---|
G91 | No address words |
How it works
Modal, distance group.
Example program
G0 G20 G90 G54 G17 G40 G49 G80 (SAFE START, INCH)
G0 X0 Y0 (START)
G91 (INCREMENTAL)
G0 X1.0 Y-1.0 (HOLE 1)
…
G0 X0 Y0 (START)
G91 (INCREMENTAL)
G0 X1.0 Y-1.0 (HOLE 1)
…
The full 7-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Return to G90 right after use. Every later move is relative until you do.
- Canned cycle R and Z change meaning in G91.
Related codes
G91 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Incremental programming |
| Haas NGC | Incremental positioning |
| Mazak (EIA) | Incremental programming |
| Okuma OSP | Incremental programming |
| Mitsubishi M70 M80 | Incremental programming |
| Brother Speedio | Incremental programming |
| Siemens 840D 828D | Incremental dimensions |
| Heidenhain TNC (ISO) | Incremental dimensions |
| Fagor 8055 8065 | Incremental programming |
| LinuxCNC Tormach | Incremental distance mode |
| Centroid CNC12 Acorn | Incremental positioning |
| Hurco WinMax (NC) | Incremental mode |
| Fadal | Incremental positioning |
Every G-code for Mach3 Mach4 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 G91 in the app All Mach3 Mach4 G-codes