| Code | Parameters | Description |
|---|---|---|
| Motion | (X- Y- Z- A- B- C- apply to all motions) | |
| G0 | Rapid motion | |
| G1 | Coordinated motion ("Straight feed") | |
| G2, G3 | I- J- K- or R- | Coordinated helical motion ("Arc feed") |
| G38.2 | Straight Probe | |
| G80 | Cancel motion mode | |
| G81 | R- L- P- | Drilling Cycle |
| G82…G89 | R- L- P- Q- | Other canned cycles |
| G33 | K- | Spindle-synchronized motion |
| G76 | P- Z- I- J- R- K- Q- H- | Multipass lathe threading cycle |
| Plane Selection (affects G2, G3, G81…G89, G40…G42) | ||
| G17 | Select XY plane | |
| G18 | Select XZ plane | |
| G19 | Select YZ plane | |
| Distance Mode | ||
| G90 | Absolute distance mode | |
| G91 | Incremental distance mode | |
| Feed Rate Mode | ||
| G93 | Inverse time feed rate | |
| G94 | Units per minute feed rate | |
| Units | ||
| G20 | Inches | |
| G21 | Millimeters | |
| Cutter Radius Compensation | ||
| G41, G42 | D- | Start cutter radius compensation left or right |
| G40 | Cancel cutter radius compensation | |
| Tool Length Offset | ||
| G43 | H- | Use tool length offset |
| G49 | Cancel tool length offset | |
| Return Mode in Canned Cycles | ||
| G98 | Retract to R- position | |
| G99 | Retract to prior position | |
| Path Control Mode | ||
| G61 | Exact Path mode | |
| G61.1 | Exact Stop mode | |
| G64 | P- | Continuous mode with optional path tolerance |
| Stopping | ||
| M0 | Pause Program | |
| M2 | End Program | |
| M1, M30, M60 | Other stop codes | |
| Spindle Control | ||
| M3, M4 | S- | Turn spindle clockwise or counterclockwise |
| M5 | Stop spindle | |
| Coolant | ||
| M7 | Turn mist on | |
| M8 | Turn flood on | |
| M9 | Turn all coolant off | |
| Other Input Codes | ||
| F- | Set Feed Rate | |
| S- | Set Spindle Speed | |
| T- | Select Tool | |
| M50…M53 | P0 (off) or P1 (on) | Feed Override, Spindle Override, Adaptive Feed, Feed Hold |
| G54…G59, G59.1…G59.3 | Select coordinate system | |
| Flow-control Codes | ||
| O- | sub/endsub, while/endwhile, if/else/endif, do/while, call, break/continue/return | |
| Non-modal Codes | ||
| M6 | T- | Change tool |
| G4 | P- | Dwell (seconds) |
| G10 | L2 P- X- Y- Z- A- B- C- | Coordinate system origin setting |
| G28 | Return to home | |
| G30 | Return to secondary home | |
| G53 | Motion in machine coordinate system | |
| G92 | X- Y- Z- A- B- C- | Offset coordinate systems and set parameters |
| G92.1 | Cancel offset coordinate systems and set parameters to zero | |
| G92.2 | Cancel offset coordinate systems but do not reset parameters | |
| G92.3 | Apply parameters to offset coordinate systems | |
| M101…M199 | P- Q- | User-defined M-codes |
| (MSG,…) | Display the message "…" to the user | |