G-Code
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G-Code (also known as the RS-274 standard) is the numerical control language that is used to program most CNC Machines. There are several variations to the code used and not all G-code is created equally. Please check with the CNC control software (Mach3, LinuxCNC, UCCNC, Grbl) for specific reference and setup with CNC processors.
| G-Code | Code Description |
|---|---|
| G00 | Rapid Positioning |
| G01 | Linear Interpolation |
| G02 | Circular Interpolation, Clockwise |
| G03 | Circular Interpolation, Counterclockwise |
| G04 | Dwell |
| G10 | Coordinate System Origin Setting |
| G17 | XY Plane Selection |
| G18 | XZ Plane Selection |
| G19 | YZ Plane Selection |
| G20 | Unit Selection: Inch |
| G21 | Unit Selection: MM |
| G27 | Verify Home |
| G28 | Home Return (Soft Home) |
| G30 | Home |
| G33 | Lathe Thread Cycle |
| G40 | Cancel Cutter Compensation |
| G41 | Cutter Compensation Left |
| G42 | Cutter Compensation Right |
| G43 | Tool Length Offset |
| G49 | Cancel Tool Length Offset |
| G53 | Motion in Machine Coordinate System |
| G54 | Select Coordinate System 1 |
| G55 | Select Coordinate System 2 |
| G56 | Select Coordinate System 3 |
| G57 | Select Coordinate System 4 |
| G58 | Select Coordinate System 5 |
| G59 | Select Coordinate System 6 |
| G59.1 | Select Coordinate System 7 |
| G59.2 | Select Coordinate System 8 |
| G59.3 | Select Coordinate System 9 |
| G65 | Subroutine |
| G80 | Cancel Motion Modes |
| G81 | Drilling Cycle |
| G82 | Drilling Cycle with Dwell |
| G83 | Drilling Cycle with Peck |
| G85 | Boring Cycle, No Dwell, Feed Out |
| G86 | Boring Cycle, Stop, Rapid Out |
| G87 | Back Boring Cycle |
| G88 | Boring Cycle, Stop, Manual Out |
| G89 | Boring Cycle, Dwell, Feed Out |
| G90 | Absolute Distance Mode |
| G91 | Incremental Distance Mode |
| G92 | Coordinate System Offset |
| G92.2 | Cancel Coordinate System Offsets |
| G92.3 | Restore Axis Offsets |
| G93 | Inverse Time Feed Mode |
| G94 | Feed per Minute Mode |
| G95 | Feed per Revolution Mode |
| G96 | Constant Surface Speed |
| G97 | RPM Mode |
| G98 | Initial Level Return in Canned Cycles |
| G99 | R-Point Level Return in Canned Cycles |
M-Commands
The following is a list of the most typical M-Commands that are supported by every major CNC motion controller program. Beyond M09, most software will allow the creation of custom M-Commands. Consult the documentation for your specific commands associated with your software and machine. Not all commands will be available.
| M-Command | Code Description |
|---|---|
| M00 | Program Stop |
| M01 | Optional Stop |
| M02 | Program End |
| M03 | Spindle On, Clockwise |
| M04 | Spindle On, Counter-Clockwise |
| M05 | Spindle Off |
| M06 | Tool change |
| M07 | Mist Coolant On |
| M08 | Flood Coolant On |
| M09 | Coolant Off |