# LinuxCNC G90

Instructions · `G90` · verification: source checked

G90 selects absolute distance mode in LinuxCNC. In this mode, axis numbers for X, Y, Z, A, B, C, U, V, and W usually represent positions in the currently active coordinate system rather than increments from the current position. Exceptions are described in the canned cycle section.

## Specification

| Property | Value |
|---|---|
| Language | gcode |
| Code | G90 |
| Group | distance mode |
| Syntax | G90 |
| Dialect | LinuxCNC |

## Study notes

- G91 selects incremental distance mode, where axis numbers usually represent increments from the current coordinate.
- In G80-G89 canned cycles, absolute distance mode interprets X, Y, R, and Z numbers as absolute positions in the current coordinate system.
- G90.1 sets absolute distance mode for I, J, and K offsets; G91.1 sets incremental distance mode for I, J, and K offsets.

## Sources

1. [G-Codes](https://linuxcnc.org/docs/html/gcode/g-code.html#gcode:g90-g91) (accessed 2026-10-26)

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Source page: https://machineschema.com/instruction/gcode-g90  
JSON: https://machineschema.com/instruction/gcode-g90.json  
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite Machine Schema and the original sources.