LinuxCNC "G-code" Quick Reference
Code | Parameters | Description
--- | --- | ---
Motion | (X Y Z A B C U V W apply to all motions)
G0 |  | Rapid Move
G1 |  | Linear Move
G2, G3 | I J K or R P | Arc Move
G4 | P | Dwell
G5 | I J P Q | Cubic Spline
G5.1 | I J | Quadratic Spline
G5.2 | P L | NURBS
G38.2 - G38.5 |  | Straight Probe
G33 | K ($) | Spindle Synchronized Motion
G33.1 | K ($) | Rigid Tapping
G80 |  | Cancel Canned Cycle
Canned cycles | (X Y Z or U V W apply to canned cycles, depending on active plane)
G70 | Q (X) (Z) (D) (E) (P) | Lathe finishing cycle
G71 G72 | Q (X) (Z) (D) (E) (P) | Lathe roughing cycle
G73 | R L Q | Drilling Cycle, Chip Breaking
G74 | R L (P) ($) | Left-hand Tapping Cycle, Dwell
G76 | P Z I J R K Q H L E ($) | Threading Cycle
G81 | R L (P) | Drilling Cycle
G82 | R L (P) | Drilling Cycle, Dwell
G83 | R L Q | Drilling Cycle, Peck
G84 | R L (P) ($) | Right-hand Tapping Cycle, Dwell
G85 | R L (P) | Boring Cycle, Feed Out
G89 | R L (P) | Boring Cycle, Dwell, Feed Out
Distance Mode
G90, G91 |  | Distance Mode
G90.1, G91.1 |  | Arc Distance Mode
G7 |  | Lathe Diameter Mode
G8 |  | Lathe Radius Mode
Feed Rate Mode
G93, G94, G95 | S ($) | Feed Rate Mode
Spindle Control
M3, M4, M5 | S ($) | Spindle Control
M19 | R Q (P) ($) | Orient Spindle
G96, G97 | S D ($) | Spindle Control Mode
Coolant
M7, M8, M9 |  | Coolant Control
Tool Length Offset
G43 | H | Tool Length Offset
G43.1 |  | Dynamic Tool Length Offset
G43.2 | H | Apply additional Tool Length Offset
G49 |  | Cancel Tool Length Compensation
Stopping
M0, M1 |  | Program Pause
M2, M30 |  | Program End
M60 |  | Pallet Change Pause
Units
G20, G21 |  | Units (inch, mm)
Plane Selection | (affects G2, G3, G81…G89, G40…G42)
G17 - G19.1 |  | Plane Select
Cutter Radius Compensation
G40 |  | Compensation Off
G41,G42 | D | Cutter Compensation
G41.1, G42.1 | D L | Dynamic Cutter Compensation
Path Control Mode
G61 G61.1 |  | Exact Path Mode
G61.1 |  | Exact Stop Mode
G64 | P Q | Path Blending
Return Mode in Canned Cycles
G98, G99 |  | Canned Cycle Return Level
Other Modal Codes
F |  | Set Feed Rate
S | ($) | Set Spindle Speed
T |  | Select Tool
M48, M49 |  | Speed and Feed Override Control
M50 | P0 (off) or P1 (on) | Feed Override Control
M51 | P0 (off) or P1 (on) ($) | Spindle Speed Override Control
M52 | P0 (off) or P1 (on) | Adaptive Feed Control
M53 | P0 (off) or P1 (on) | Feed Stop Control
G54-G59.3 |  | Select Coordinate System
Flow-control Codes
o sub |  | Subroutines, sub/endsub call
o while |  | Looping, while/endwhile do/while
o if |  | Conditional, if/else/endif
o repeat |  | Repeat a loop of code
[] |  | Indirection
o call |  | Call named file
M70 |  | Save modal state
M71 |  | Invalidate stored state
M72 |  | Restore modal state
M73 |  | Save and Auto-restore modal state
Input/Output Codes
M62 - M65 | P | Digital Output Control
M66 | P E L Q | Wait on Input
M67 | T | Analog Output, Synchronized
M68 | T | Analog Output, Immediate
Non-modal Codes
M6 | T | Tool Change
M61 | Q | Set Current Tool
G10 L0 |  | Reload Tool Table Data
G10 L1 | P Q R | Set Tool Table
G10 L10 | P | Set Tool Table
G10 L11 | P | Set Tool Table
G10 L2 | P R | Set Coordinate System
G10 L20 | P | Set Coordinate System
G28, G28.1 |  | Go/Set Predefined Position
G30, G30.1 |  | Go/Set Predefined Position
G53 |  | Move in Machine Coordinates
G52, G92 |  | Coordinate System Offset
G92.1, G92.2 |  | Reset G92 Offsets
G92.3 |  | Restore G92 Offsets
M101 - M199 | P Q | User Defined Commands
Comments & Messages
; (…) |  | Comments
(MSG,…) |  | Messages
(DEBUG,…) |  | Debug Messages
(PRINT,…) |  | Print Messages