LinuxCNC G43.1 Dynamic Tool Length Offset

G43.1 is a LinuxCNC G-code that dynamically replaces the current tool length offset values for the specified axes. It does not cause motion; the next move of a compensated axis uses the new offset. The change is not written to the tool table.

Source checked5/5 values · 2026-10-26

Specification

1 source

Language	gcode
Code	G43.1
Syntax	G43.1 axes
Dialect	LinuxCNC

Parameters

Name	Description
axes	Axes whose current offset(s) are replaced.

Study notes

G43.1 does not cause any motion; it changes subsequent motions by replacing the current offset(s) of axes.
The next time a compensated axis is moved, that axis’s endpoint is the compensated location.
G43.1 does not write to the tool table.
Example: after T1 M6 G43 leaves the DRO showing Z1.500, G43.1 Z0.250 replaces the current tool offset with 0.250 and the DRO shows Z0.250.
The documented prototype is G43.1 axes.
The section cross-references G90, T, M6 and G43; no matching reference ids are available.

Safety

Programming motion on the same line as G43.1 is an error.