LinuxCNC G42.1 Dynamic Cutter Compensation Right

G42.1 is a LinuxCNC G-code that turns on dynamic cutter compensation to the right of the programmed path, with the cutter diameter given by the D word. It works like G42 but also lets the program specify the tool diameter directly; the optional L word sets tool orientation and defaults to 0.

Source checked7/7 values · 2026-10-26

Specification

1 source

Language	gcode
Code	G42.1
Group	cutter compensation
Syntax	G42.1 D- <L-> (right of programmed path)
Dialect	LinuxCNC

Parameters

Name	Description
D	Cutter diameter.
L	Tool orientation; defaults to 0 if unspecified.

Study notes

G41.1 is the left-of-path counterpart to G42.1 in the same section.
G41.1 and G42.1 behave the same as G41 and G42 but add direct programming of the tool diameter.

Safety

It is an error if the YZ plane is active.
The L number must be in the range 0 to 9 inclusive.
Using the L number is an error when the XZ plane is not active.
It is an error to command cutter compensation on when it is already on.