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M00: Stop whatever program is currently operating — axes, coolant flooding or spindle.

M01: This command indicates an optional stop for the program.

M02: End of the currently running program.

M03: Begin to move the spindle clockwise.

M04: Start moving the spindle counterclockwise or in reverse.

M05: Stop moving the spindle.

M06: Load on a different tool. Typically, this command comes with the T value. For example, you may see “T1 M06.”

M08: Start flooding the system with coolant.

M09: Stop the coolant flow.

 

M00: Program Stop

The M00 command will terminate the current program, allowing you to switch equipment or run troubleshooting tasks.

 

M02: End of Program

The M02 command ends the program entirely. Ending your machine’s current program is the first step to beginning another.

 

M03: Spindle Start

The M03 command moves the spindle forward in a clockwise rotation. This command might seem similar to the function of the G02 command, but G codes move only the machine.

 

M04: Spindle Start

The M04 command moves the spindle in the reverse direction of the M03 command, taking it in a counterclockwise rotation. This is a necessary maneuver in many computer-aided manufacturing tasks.

 

M05: Spindle Stop

The M05 command stops the spindle so you can examine the current state of your work.

 

M06: Tool Change

The M06 command allows you to switch out your tools without damaging the equipment.