Introduction to G Codes and M Codes
Fanuc M-Code G-Code, G codes (preparatory commands) and M codes (auxiliary commands) are essential instructions used to control machine tools.
- G codes govern motion, positioning, and machining operations (e.g., linear interpolation, circular movements, tool compensation).
- M codes manage auxiliary functions (e.g., spindle control, coolant activation, tool changes).
These Fanuc M-Code G-Code vary slightly depending on the machine type (lathe, mill, etc.) and Fanuc control version. Always consult your machine’s manual for specifics.
Common Fanuc G Codes
| Code | Description |
|---|---|
| G00 | Rapid positioning (fast traverse) |
| G01 | Linear interpolation (straight-line motion) |
| G02 | Circular interpolation (clockwise) |
| G03 | Circular interpolation (counterclockwise) |
| G04 | Dwell (pause) |
| G05 | non standard g-code |
| G17 | XY plane selection |
| G18 | XZ plane selection |
| G19 | YZ plane selection |
| G20 | Programming in inches |
| G21 | Programming in millimeters |
| G28 | Return to reference position (home) |
| G30 | Return to secondary reference position |
| G40 | Cancel tool radius compensation |
| G41 | Tool radius compensation left |
| G42 | Tool radius compensation right |
| G43 | Tool length compensation (positive) |
| G44 | Tool length compensation (negative) |
| G49 | Cancel tool length compensation |
| G54–G59 | Work coordinate system (WCS) selection |
| G61 | Exact stop check (precision mode) |
| G90 | Absolute programming |
| G91 | Incremental programming |
| G92 | Set position by programming |
| G94 | Per-minute feedrate mode |
| G95 | Per-revolution feedrate mode |
| G100–G199 | Macro programs (varies by configuration) |
Common Fanuc M Codes
| Code | Description |
|---|---|
| M00 | Program stop |
| M01 | Optional stop |
| M02 | Program end |
| M03 | Spindle on (clockwise) |
| M04 | Spindle on (counterclockwise) |
| M05 | Spindle stop |
| M06 | Tool change |
| M07 | Mist coolant on |
| M08 | Flood coolant on |
| M09 | Coolant off |
| M10 | Chuck close |
| M11 | Chuck open |
| M19 | Spindle orientation |
| M20 | Open tool magazine door |
| M21 | Close tool magazine door |
| M28 | Enable external data input |
| M29 | Disable external data input |
| M30 | Program end and return to start |
| M41–M49 | Tool changer preparation |
| M61–M69 | Tool selection (machine-specific) |
| M98 | Subprogram call |
| M99 | Subprogram return |
| M100–M199 | Customizable codes (user-defined) |
Notes
- Variations: Codes may differ by machine manufacturer or Fanuc control version.
- Documentation: Always refer to your machine’s manual for exact code definitions.
- Compatibility: Codes depend on the machine type (e.g., lathe vs. mill).
For exhaustive lists of Fanuc M-Code G-Code, consult Fanuc technical manuals or your machine’s programming guide.
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