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G91 Incremental programming
Mitsubishi M70 M80 G-code · Mill
Positions are distances from the current position.
Format
G91
How it works
Modal, group 03.
Example program
G91 G01 X.5 F20. (MOVE .5 PLUS X)
Y.5 (MOVE .5 PLUS Y)
G90 (BACK TO ABSOLUTE)
Y.5 (MOVE .5 PLUS Y)
G90 (BACK TO ABSOLUTE)
Example is in inch. Check offsets and clearances first.
Watch out for
- Go back to G90 right after G91 G28 lines. Forgetting it is a common 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 |
| Brother Speedio | 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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