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G91 Incremental programming
Fagor 8055 8065 G-code · Mill and lathe
Coordinates are distances from the current position.
Format
G91
Addresses
| Address | What it does |
|---|---|
None | No addresses |
How it works
Modal. Replaced by G90.
Example program
G90 G00 X1.0 Y1.0 (ABSOLUTE START)
G91 G01 X0.5 F20.0 (MOVE 0.5 MORE IN X)
G90 (BACK TO ABSOLUTE)
G91 G01 X0.5 F20.0 (MOVE 0.5 MORE IN X)
G90 (BACK TO ABSOLUTE)
Example is in inch. Check offsets and clearances first.
Watch out for
- In canned cycles G91 also changes how Z and I are read.
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 |
| LinuxCNC Tormach | Incremental distance mode |
| Mach3 Mach4 | Incremental mode |
| Centroid CNC12 Acorn | Incremental positioning |
| Hurco WinMax (NC) | Incremental mode |
| Fadal | Incremental positioning |
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