CNC Machinist Calculator UltraHome › G-codes › Centroid CNC12 Acorn › G91
G91 Incremental positioning
Centroid CNC12 Acorn G-code · Mill
Positions are distances from the current position.
Format
G91
Addresses
| Address | What it does |
|---|---|
none | No words |
How it works
Modal.
Example program
G90 G54 G0 X0 Y0 ; ABSOLUTE START
G91 G1 X1. F20. ; MOVE 1 INCH IN X
G90 ; BACK TO ABSOLUTE
G91 G1 X1. F20. ; MOVE 1 INCH IN X
G90 ; BACK TO ABSOLUTE
Example is in inch. Check offsets and clearances first.
Watch out for
- Return to G90 right after an incremental move. A forgotten G91 is a classic crash.
- In canned cycles with G91, Z is measured from R.
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 |
| Mach3 Mach4 | Incremental mode |
| Hurco WinMax (NC) | Incremental mode |
| Fadal | Incremental positioning |
Every G-code for Centroid CNC12 Acorn 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 Centroid CNC12 Acorn G-codes