LinuxCNC G30.1

G30.1 is a LinuxCNC G-code that stores the current absolute position into parameters 5181-5186. The stored values form the predefined position used by the G30 command, which makes a rapid move to the values held in parameters 5181-5189 for all axes defined in the INI file. If no position has been stored with G30.1, a G30 move sends all axes to the machine origin.

Source checked3/3 values · 2026-10-26

Specification

1 source

Language	gcode
Code	G30.1
Group	Go/Set Predefined Position
Syntax	G30.1
Dialect	LinuxCNC

Study notes

G30 functions the same as G28 but uses the values stored in parameters 5181-5189 as the X Y Z A B C U V W final point to move to.
Parameter values used by G30 are absolute machine coordinates in the native machine units as specified in the INI file.
All axes defined in the INI file will be moved when a G30 is issued; with G30 axes, any axis not specified will not move.
G30.1 stores the current absolute position into parameters 5181-5186.
If TOOL_CHANGE_AT_G30=1 is set in the [EMCIO] section of the INI file, G30 parameters are used to move the tool when an M6 is programmed.

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 when G30/G30.1 is used.