GRBL G-Code Definitions

Both Shapeoko and Nomad 883 use the GRBL G-code interpreter which implements a subset of the NIST RS274/NGC standard. You can read more about the standard here:

http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.15.7813

Supported G-Codes and definitions

  • G38.3, G38.4, G38.5: Probing
  • G40: Cutter Radius Compensation Modes
  • G61: Path Control Modes
  • G91.1: Arc IJK Distance Modes
  • Supported G-Codes in v0.9h
  • G38.2: Probing
  • G43.1, G49: Dynamic Tool Length Offsets
  • Supported G-Codes in v0.8 (and v0.9)
  • G0, G1: Linear Motions
  • G2, G3: Arc and Helical Motions
  • 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
  • G53: Move in Absolute Coordinates
  • G54, G55, G56, G57, G58, G59: Work Coordinate Systems
  • G80: Motion Mode Cancel
  • G90, G91: 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
  • M8, M9: Coolant Control

Note that Carbide Motion only supports a limited subset of these as noted at:

http://carbide3d.com/docs/list-of-supported-gcodes/ (and will manually handle some G-codes so as to facilitate tool changes)

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