LinuxCNC G4 Dwell

G4 is a dwell command in LinuxCNC G-code. It pauses all axis motion for the time given by the P word in seconds. It does not affect spindle, coolant, or I/O.

Source checked6/6 values · 2026-10-26

Specification

1 source

Language	gcode
Code	G4
Syntax	G4 P-
Dialect	LinuxCNC

Parameters

Name	Data type	Description
P	floating point	Seconds to dwell; all axes remain unmoving. Fractions of a second may be used.

Study notes

Dwell time is a floating point value, so fractions of a second are allowed.
Example: G4 P0.5 waits for 0.5 seconds before proceeding.
G4 does not affect spindle, coolant, or any I/O.

Safety

Operating limit: the P number must be specified and must not be negative.