CNC M - CODES

OFTEN USED MISCELLANEOUS “M” CODES

M00 The M00 code is used for a Program Stop command on the machine.

It stops the spindle, turns off coolant and stops lookahead processing.

Pressing CYCLE START again will continue the program on the next

block of the program.

M01 The M01 code is used for an Optional Program Stop command.

Pressing the OPT STOP key on the control panel signasl the machine

to perform a stop command when the control reads an M01 command. It will

then perform like an M00.

M03 Starts the Spindle FORWARD. Must have a spindle speed defined.

M04 Starts the Spindle REVERSE. Must have a spindle speed defined.

M05 STOPS the Spindle

M08 Coolant ON command

M09 Coolant OFF command

M30 Program End and Reset to the beginning of program.

M97 Local Subroutine Call

M98 Subprogram Call

M99 Subprogram Return (M98) or Subroutine Return (M97), or a Program Loop.