Heidenhain M Code List – TNC 426

Heidenhain M Code list for CNC machinists who work on CNC machines with Heidenhain TNC 426 and similar CNC controls.

Heidenhain M Code List - TNC 426

Heidenhain M Code List – TNC 426

Heidenhain M Code List

M Code  Function
M0         Program stop
M1         Optional stop (program stop only with opt. stop)
M2         Program end
M3         Spindle ON clockwise
M4         Spindle ON counterclockwise
M5         Spindle Stop
M6         Tool change
M8         Coolant ON
M9         Coolant OFF
M10       Dividing head, clamping ON
M11       Dividing head, clamping OFF
M17       End of subprogram
M25       OPEN clamp/ machine vice
M26       CLOSE clamp/ machine vice
M27       Swivel dividing head
M30       Main program end
M71       Puff blowing device ON
M72       Puff blowing device OFF
M99       Cycle call