Most Common Turning M Codes for CNC Programming

Most Common Turning M Codes 

The following is a list of Comming CNC Programming M Codes for turning applications.  These are excerpts from 7 Easy Steps to CNC Programming Book II, Beyond the Beginning.

For the list of CNC Programming G codes for turning applications see previous post.

CNC M Code	CNC M Code Group	What CNC M Code does / How to Use the CNC M Code
M0 / M00	04	Program  Stop.  Suspends program execution.
M1 / M01	04	Optional Stop.  Only suspends program execution if the optional stop button on the machine’s operator panel is toggled to optional stop mode.
M2 / M02	04	Program End.  Tells the control it is at the end of the program and resets all the modal commands to the machine.
M3 / M03	07	Modal. Clockwise Spindle Rotation. Starts spindle rotation in a clockwise direction.
M3 / M04	07	Modal. Counter-Clockwise Spindle Rotation. Starts spindle rotation in a counter-clockwise direction.
M5 / M05	07	Spindle Stop.  Stops rotation of spindle.
M8 / M08	08	Flood Coolant On.
M9 / M09	08	Coolant Off.
M10	02	Clamp Chuck.
M11	02	Chuck Un-Clamp.
M30	04	Program End and Rewind.  This command tells the control it has reached the end of the program and resets the cursor to the first line of the program.  Back in the “old days,” the M30 would cause the NC tape to rewind back to the beginning.
M98		Sub-Program call. (See page 29)
M99		Return to Main Program. (See page 29)
M99		Loop program.  When used in a program that was not called as a subprogram, the M99 returns the cursor to the start of the program and continues execution.  This can be handy when running jobs with a bar feeder.  Instead of programming an M30, you can program the last two lines to read:               M01;               M99;  The M01 will allow the operator to stop the program for taking breaks, shift change, changing bar stock, or whatever reason.  Until the Optional Stop switch is toggled ON, the machine will keep looping through the program.   Once the Optional Stop button is toggled ON, the machine will stop just prior to reading the M99.  The operator can do what ever needs doing, then hit the Cycle Start button. The program will resume operations from the beginning.

Watch for future posts that will feature G and M code lists excerpted from 7 Easy Steps to Cnc Programming . . . Beyond the Beginning