LinuxCNC M49

M49 is a LinuxCNC M-code that disables both the spindle speed and feed rate override controls. It is paired with M48, which enables those controls. An optional $ parameter can select which spindle the command applies to.

Source checked4/4 values · 2026-10-26

Specification

1 source

Language	gcode
Code	M49
Group	Speed and Feed Override Control
Dialect	LinuxCNC

Parameters

Name	Description
$	Optional parameter to determine which spindle the command operates on.

Study notes

M48 enables the spindle speed and feed rate override controls; M49 disables both.
The command accepts an optional $ parameter to determine which spindle it operates on.
M50 and M51 can enable or disable the feed override and spindle speed override controls individually.