Most Used M Codes for CNC Machinist

M00: Program stop

Stop the program where ever placed

M01: Optional stop

Stop the program were ever placed. Toggled on and off on the control panel.

M02: End of program

M03: Spindle clockwise

Turn spindle on clockwise accompanied with an S value for the speed

M04: Spindle counterclockwise

Turn spindle on counterclockwise accompanied with an S value for the speed

M05: Spindle stop

Stops spindle

M06: Tool change

Mainly used on the mill to change to the desired tool T value.

M07: Spindle coolant on

Through tool spindle, coolant activation can be toggled on the control panel

M08: Flood coolant on

Flood coolant activation can be toggled on the control panel

M09: Coolant off

Turns coolant off can be toggled on the control panel

M19: Spindle lock

Lock spindle in the home position. You won't be able to turn the spindle by hand.

M30: End of program

Ending of the program and return to the top of the program

M98: Sub-program activate

Move to subprogram accompanied by P-value indicating the program number.

M99: Return from sub-program

Go back to main program