G-Code and M-Code Reference List for CNC Mills

G-Code and M-Code Reference List for Milling

A list of g-codes and m-codes for milling in the Fanuc, LinuxCNC, GRBL, and Haas dialects.  We give a quick definition of each g-code along with a link to tutorials and examples of how to use it.  Click the g-code link (if any) to visit a tutorial from our popuplar Online Free G-Code Training that shows examples and teaches how to program the g-code.

 
 
Code
Category
Function

Notes

 
  G00
Motion
Move in a straight line at rapids speed. XYZ of endpoint  
  G01
Motion
Move in a straight line at last speed commanded by a (F)eedrate XYZ of endpoint  
  G02
Motion
Clockwise circular arc at (F)eedrate XYZ of endpoint IJK relative to center R for radius  
  G03
Motion
Counter-clockwise circular arc at (F)eedrate XYZ of endpoint IJK relative to center R for radius  
  G04
Motion
Dwell: Stop for a specified time. P for milliseconds X for seconds  
  G05
Motion
FADAL Non-Modal Rapids    
  G09
Motion
Exact stop check    
           
  G10
Compensation
Programmable parameter input    
  G15
Coordinate
Turn Polar Coordinates OFF, return to Cartesian Coordinates    
  G16
Coordinate
Turn Polar Coordinates ON    
  G17
Coordinate
Select X-Y plane    
  G18
Coordinate
Select X-Z plane    
  G19
Coordinate
Select Y-Z plane    
  G20
Coordinate
Program coordinates are inches    
  G21
Coordinate
Program coordinates are mm    
  G27
Motion
Reference point return check    
  G28
Motion
Return to home position    
  G29
Motion
Return from the reference position    
  G30
Motion
Return to the 2nd, 3rd, and 4th reference point    
  G32
Canned
Constant lead threading (like G01 synchronized with spindle)    
  G40
Compensation
Tool cutter compensation off (radius comp.)    
  G41
Compensation
Tool cutter compensation left (radius comp.)    
  G42
Compensation
Tool cutter compensation right (radius comp.)    
  G43
Compensation
Apply tool length compensation (plus)    
  G44
Compensation
Apply tool length compensation (minus)    
  G49
Compensation
Tool length compensation cancel    
  G50
Compensation
Reset all scale factors to 1.0    
  G51
Compensation
Turn on scale factors    
  G52
Coordinate
Local workshift for all coordinate systems: add XYZ offsets    
  G53
Coordinate
Machine coordinate system (cancel work offsets)    
  G54
Coordinate
Work coordinate system (1st Workpiece)    
  G55
Coordinate
Work coordinate system (2nd Workpiece)    
  G56
Coordinate
Work coordinate system (3rd Workpiece)    
  G57
Coordinate
Work coordinate system (4th Workpiece)    
  G58
Coordinate
Work coordinate system (5th Workpiece)    
  G59
Coordinate
Work coordinate system (6th Workpiece)    
  G61
Other
Exact stop check mode    
  G62
Other
Automatic corner override    
  G63
Other
Tapping mode    
  G64
Other
Best speed path    
  G65
Other
Custom macro simple call    
  G68
Coordinate
Coordinate System Rotation    
  G69
Coordinate
Cancel Coordinate System Rotation    
  G73
Canned
High speed drilling cycle (small retract)    
  G74
Canned
Left hand tapping cycle    
  G76
Canned
Fine boring cyle    
  G80
Canned
Cancel canned cycle    
  G81
Canned
Simple drilling cycle    
  G82
Canned
Drilling cycle with dwell (counterboring)    
  G83
Canned
Peck drilling cycle (full retract)    
  G84
Canned
Tapping cycle    
  G85
Canned
Boring canned cycle, no dwell, feed out    
  G86
Canned
Boring canned cycle, spindle stop, rapid out    
  G87
Canned
Back boring canned cycle    
  G88
Canned
Boring canned cycle, spindle stop, manual out    
  G89
Canned
Boring canned cycle, dwell, feed out    
 
  G90
Coordinate
Absolute programming of XYZ (type B and C systems)    
  G90.1
Coordinate
Absolute programming IJK (type B and C systems)    
  G91
Coordinate
Incremental programming of XYZ (type B and C systems)    
  G91.1
Coordinate
Incremental programming IJK (type B and C systems)    
  G92
Coordinate
Offset coordinate system and save parameters    
  G92 (alternate)
Motion
Clamp of maximum spindle speed S  
  G92.1
Coordinate
Cancel offset and zero parameters    
  G92.2
Coordinate
Cancel offset and retain parameters    
  G92.3
Coordinate
Offset coordinate system with saved parameters    
  G94
Motion
Units per minute feed mode. Units in inches or mm.    
  G95
Motion
Units per revolution feed mode. Units in inches or mm.    
  G96
Motion
Constant surface speed    
  G97
Motion
Cancel constant surface speed    
  G98
Canned
Return to initial Z plane after canned cycle    
  G99
Canned
Return to initial R plane after canned cycle    
           
 
M-Codes
 
 
Code
Category
Function

Notes

 
  M00
M-Code
Program Stop (non-optional)    
  M01
M-Code
Optional Stop: Operator Selected to Enable    
  M02
M-Code
End of Program    
  M03
M-Code
Spindle ON (CW Rotation)    
  M04
M-Code
Spindle ON (CCW Rotation)    
  M05
M-Code
Spindle Stop    
  M06
M-Code
Tool Change    
  M07
M-Code
Mist Coolant ON    
  M08
M-Code
Flood Coolant ON    
  M09
M-Code
Coolant OFF    
           
  M17
M-Code
FADAL subroutine return    
  M29
M-Code
Rigid Tapping Mode on Fanuc Controls    
  M30
M-Code
End of Program, Rewind and Reset Modes    
           
  M97
M-Code
Haas-Style Subprogram Call    
  M98
M-Code
Subprogram Call    
  M99
M-Code
Return from Subprogram    

 

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G-Code and M-Code Reference List for CNC Mills
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