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G90 Absolute dimensions
Siemens 840D 828D G-code · Mill and lathe
End points are measured from the active work zero. G90 is the usual default. Single values can be made incremental with IC().
Format
G90
How it works
Modal, G group 14 (absolute or incremental).
Example program
G90 G54 ; ABSOLUTE
G0 X10 Y10 ; TO X10 Y10 FROM WORK ZERO
G1 X50 F300 ; TO X50
G0 X10 Y10 ; TO X10 Y10 FROM WORK ZERO
G1 X50 F300 ; TO X50
Example is in inch. Check offsets and clearances first.
Watch out for
- Arc centers I J K are still incremental from the start point in G90 unless written as I=AC().
- X=IC(5) moves 5 more in X while G90 stays active.
Related codes
G90 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Absolute programming |
| Haas NGC | Absolute positioning |
| Mazak (EIA) | Absolute programming |
| Okuma OSP | Absolute programming |
| Mitsubishi M70 M80 | Absolute programming |
| Brother Speedio | Absolute programming |
| Heidenhain TNC (ISO) | Absolute dimensions |
| Fagor 8055 8065 | Absolute programming |
| LinuxCNC Tormach | Absolute distance mode |
| Mach3 Mach4 | Absolute mode |
| Centroid CNC12 Acorn | Absolute positioning |
| Hurco WinMax (NC) | Absolute mode |
| Fadal | Absolute positioning |
| Swiss (Citizen Star) | OD turning cycle |
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