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G91 Incremental programming
Brother Speedio G-code · Mill
Each position is a distance from the current point.
Format
G91
How it works
Modal, distance group.
Example program
G91 G28 Z0 (Z HOME)
G90 (BACK TO ABSOLUTE)
G00 X1. Y1. (ABSOLUTE MOVE)
G90 (BACK TO ABSOLUTE)
G00 X1. Y1. (ABSOLUTE MOVE)
Example is in inch. Check offsets and clearances first.
Watch out for
- Switch back to G90 right after an incremental move. A forgotten G91 is a classic crash.
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 |
| Siemens 840D 828D | Incremental dimensions |
| Heidenhain TNC (ISO) | Incremental dimensions |
| Fagor 8055 8065 | Incremental programming |
| 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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