LinuxCNC G90

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.

Source checked3/3 values · 2026-10-26

Specification

1 source

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.