List of M-codes , Fanuc Control M codes List

List of M-codes commonly found on Fanuc and similarly designed controls

Code  
Description
Milling
( M )
Turning
( T )
Corollary info
M00
Compulsory stop
M
T
Non-optional—machine will always stop upon reaching M00 in the program execution.
M01
Optional stop
M
T
Machine will only stop at M01 if operator has pushed the optional stop button.
M02
End of program
M
T
No return to program top; may or may not reset register values.
M03
Spindle on (clockwise rotation)
M
T
M04
Spindle on (counterclockwise rotation)
M
T
M05
Spindle stop
M
T
M06
Automatic tool change (ATC)
M
T (some-times)
Many lathes do not use M06 because the T address itself indexes the turret.
To understand how the T address works and how it interacts (or not) with M06, one must study the various methods, such as lathe turret programming, ATC fixed tool selection, ATC random memory tool selection, the concept of "next tool waiting", and empty tools. Programming on any particular machine tool requires knowing which method that machine uses.
M07
Coolant on (mist)
M
T
M08
Coolant on (flood)
M
T
M09
Coolant off
M
T
M10
Pallet clamp on
M
For machining centers with pallet changers
M11
Pallet clamp off
M
For machining centers with pallet changers
M13
Spindle on (clockwise rotation) and coolant on (flood)
M
This one M-code does the work of both M03 and M08. It is not unusual for specific machine models to have such combined commands, which make for shorter, more quickly written programs.
M19
Spindle orientation
M
T
Spindle orientation is more often called within cycles (automatically) or during setup (manually), but it is also available under program control via M19. The abbreviation OSS (oriented spindle stop) may be seen in reference to an oriented stop within cycles.
M21
Mirror, X-axis
M
M21
Tailstock forward
T
M22
Mirror, Y-axis
M
M22
Tailstock backward
T
M23
Mirror OFF
M
M23
Thread gradual pullout ON
T
M24
Thread gradual pullout OFF
T
M30
End of program with return to program top
M
T
M41
Gear select - gear 1
T
M42
Gear select - gear 2
T
M43
Gear select - gear 3
T
M44
Gear select - gear 4
T
M48
Feedrate override allowed
M
T
M49
Feedrate override NOT allowed
M
T
This rule is also called (automatically) within tapping cycles or single-point threading cycles, where feed is precisely correlated to speed. Same with spindle speed override and feed hold button.
M60
Automatic pallet change (APC)
M
For machining centers with pallet changers
M98
Subprogram call
M
T
Takes an address P to specify which subprogram to call, for example, "M98 P8979" calls subprogram O8979.
M99
Subprogram end
M
T
Usually placed at end of subprogram, where it returns execution control to the main program. The default is that control returns to the block following the M98 call in the main program. Return to a different block number can be specified by a P address. M99 can also be used in main program with block skip for endless loop of main program on bar work on lathes (until operator toggles block skip).

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