M04 – Spindle ON (Counter Clockwise)

This command starts the spindle in counter clockwise direction at the RPM set by the S command


Syntax & Parameters


  • M04 - Clockwise command followed with or without S value.
  • M4 - The same as M04
  • S - The S value defines the required RPM. If the S value is not given then the last S value is automatically used.


Example program


N10 S1200 M04


In this example the spindle is started in counter clockwise direction at 1200 RPM.