G code Quick Reference

• G0, G1: Linear Motions

• G2, G3: Arc and Helical Motions

  • Multiple full circle arcs with G2 and G3 arcs with a P word is not supported.

• G4: Dwell

• G10 L2, G10 L20: Set Work Coordinate Offsets

• G17, G18, G19: Plane Selection

• G20, G21: Units

• G28, G30: Go to Pre-Defined Position

• G28.1, G30.1: Set Pre-Defined Position

• G38.2, G38.3, G38.4, G38.5: Probing

• G40: Cutter Radius Compensation Modes OFF (Only)

• G43.1, G49: Dynamic Tool Length Offsets

• G53: Move in Absolute Coordinates

• G54, G55, G56, G57, G58, G59: Work Coordinate Systems

• G61: Path Control Modes

• G80: Motion Mode Cancel

• G90, G91: Distance Modes

• G91.1: Arc IJK Distance Modes

• G92: Coordinate Offset

• G92.1: Clear Coordinate System Offsets

• G93, G94: Feedrate Modes

• M0, M2, M30: Program Pause and End

• M3, M4, M5: Spindle Control

  • Laser mode alters the operation of M3, M4, and spindle speed S word changes. See Laser Mode.

• M7* , M8, M9: Coolant Control

• M56* : Parking Motion Override Control

  • Grbl-specific parking motion override control with an M56 command, where M56 P0temporarily disables parking motions and M56/M56 Px with x greater than zero re-enables them.

• M62, M63, M64, M65: Digital outputs

  (*) denotes commands not enabled in config.h by default.