CNC G Codes (Preparatory Functions) and CNC M-codes (Miscellaneous Functions)

INTUWIZ Intuitive Wizard

CNC G Codes and CNC M-codes

CNC G-Code and CNC M-code are instructions to the varius CNC machine tools (CNC Mills, CNC Lathes, CNC Routers etc).

G-code (also RS-274) is used in computer-aided manufacturing (CAM-systems) to control CNC equipment.

G-code and M-codes instructions are provided to a computer numerical control machine controller (pre-read in the interpreter) that controls the stepper motors or servo motors..

These are the common G-codes and M-codes for machining.

G-codes (Preparatory Functions)

G00	Rapid positioning.Move in a straight line at rapids speed. Read more.
G01	Linear interpolation.Move in a straight line at last speed commanded by a feedrate. Read more.
G02	Clockwise circular interpolation. Read more.
G03	Counter-clockwise circular interpolation. Read more.
G04	Dwell.Stop for a specified period (may be X, U, or P). Read more.
G09	Exact Stop. Read more.
G12	Circular interpolation clockwise using the current coordinates of the machine as the center of the circle. Read more.
G13	Counterclockwise circular interpolation using the current coordinates as the center of the circle. Read more.
G17	Set XY plane. Read more.
G18	Set XZ plane. Read more.
G19	Set YZ plane. Read more.
G20	Inch units. Programming in inches (in). Read more.
G21	Metric units. Programming in millimeters (mm). Read more.
G28	Home all axes.Return to home position (go to CNC machine zero). Read more.
G30	Home all axes(secondary).Return to secondary home position (go to CNC machine zero (secondary)).
G31	Probe move.
G33	Single pass threading.
G40	Tool radius compensation off. Read more.
G41	Tool radius compensation left. Read more.
G42	Tool radius compensation right. Read more.
G43	Tool height offset compensation positive. Read more.
G44	Tool height offset compensation negative. Read more.
G49	Cancel tool offset.Cancels tool offset set by G43 or G44. Read more.
G50	Cancels scaling/mirroiring. Read more.
G51	Scaling/Mirroring Mode. Read more.
G53	Machine coordinate system. Move in Machine Coordinates. Read more.
G54-G59	Work Coordinate Systems.
G61	Exact Stop Mode Command. Read more.
G68	Coordinate System Rotation. Read more.
G69	Coordinate System Rotation Cancel. Read more.
G70	Bolt Hole Circle. Read more.
G71	Bolt Hole Arc. Read more.
G72	Bolt Holes Along an Angle. Read more.
G80	Cancel canned cycle (Motion mode cancel ).
G81	Drilling cycle. Read more.
G82	Counter Boring Cycle (Drilling Cycle with dwel). Read more.
G83	Drill cycle with peck (full retraction from pecks). Read more.
G84	Tapping Cycle. Read more.
G85	Boring Cycle. Read more.
G86	Boring Cycle for rough holes. Read more.
G90	Absolute coordinate (Absolute CNC programming).
G91	Incremental coordinate (Incremental CNC programming).
G94	Feedrate per minute (Inches/millimeters per minute). Read more.
G95	Feedrate per revolution (Inches/millimeters per revolution). Read more.
G97	(G97 S) Set spindle rev/min (rpm).

M-codes (Miscellaneous Functions)

M00
Automatic stop (CNC program end).
Read more.

M01
Optional stop (Sleep).
Read more.

M02
End of CNC program.
Read more.

M03
Spindle on clockwise.
Read more.

M04
Spindle on counterclockwise.
Read more.

M05
Spindle off.

M06
Tool change.

M07
Coolant A on (mist).

M08
Coolant B on (flood).

M09
All coolant off.

M10
Pallet clamp (Vacuum) on.

M11
Pallet clamp (Vacuum) off.

M30
End of tape (End of CNC program, with return to CNC program top).
Read more.

Useful links:

1. Free online G-code generators for a various geometric shapes.
2. Free online G-code generators for facing.
3. Free online G-code generators for drilling.
4. Free online G-code generators for engraving.
5. Offline Windows program - Intuwiz G-code Generator.

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