LinuxCNC G30

G30 is a LinuxCNC G-code that makes a rapid move from the current position to a predefined absolute position stored in parameters 5181-5189. Optionally, axis words given with G30 first move those axes to the programmed point (including offsets), then the specified axes rapid to the stored position; axes not named do not move. It functions like G28 but uses the second set of stored parameters.

Source checked5/5 values · 2026-10-26

Specification

1 source

Language	gcode
Code	G30
Group	Go/Set Predefined Position
Syntax	G30 axes
Dialect	LinuxCNC

Parameters

Name	Description
axes	Optional axis words (X Y Z A B C U V W). The axes move rapidly to the given position including any offsets, then rapidly to the absolute position stored in parameters 5181-5189. Any axis not specified will not move.

Study notes

The final point is taken from parameters 5181-5189; the values are absolute machine coordinates in the native machine units specified in the INI file.
All axes defined in the INI file are moved when a G30 is issued.
If no positions are stored with G30.1, all axes go to the machine origin.
G30.1 stores the current absolute position into parameters 5181-5186.
G30 parameters are used to move the tool when an M6 is programmed if TOOL_CHANGE_AT_G30=1 is set in the [EMCIO] section of the INI file.
Example line: G30 Z2.5 (rapid to Z2.5 then to the Z location specified in #5183).

Safety

Only use G30 when the machine is homed to a repeatable position and the desired G30 position has been stored with G30.1.
It is an error if cutter compensation is turned on.