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G90 Absolute dimensions

Heidenhain TNC (ISO) G-code · Mill

Coordinates are measured from the active datum. Klartext has no code: a coordinate without I is absolute, for example X+50.

Format

G90 X Y Z

Addresses

Address	What it does
`X Y Z`	Absolute coordinates

How it works

Modal. Cancel with G91.

Example program

N20 G31 G90 X+100 Y+100 Z+0 *
N40 G00 G40 G90 Z+250 *
N50 X-10 Y-10 *

Example is in inch. Check offsets and clearances first.

Watch out for

G31 needs G90 or G91 to say whether the max point is absolute or relative to the min point.

Related codes

G91 · G31

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
Siemens 840D 828D	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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