G-Code Cheatsheet

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Printable Cheatsheet

G Codes

G Code Description
G0 Rapid Linear Motion
G1 Linear Feed
G2 CW Arc Feed
G3 CCW Arc Feed
G4 Dwell
G5.1 Quadratic B-Spline
G5.2 G5.3 NURBs Block
G7 Diameter Mode (lathe)
G8 Radius Mode (lathe)
G10 L1 Set Tool Table Entry
G10 L10 Set Tool Table, Calculated, Workpiece
G10 L11 Set Tool Table, Calculated, Fixture
G10 L2 Coordinate System Origin Setting
G10 L20 Coordinate System Origin Setting Calculated
G17 XY Plane
G18 ZX Plane
G19 YZ Plane
G17.1 UV Plane
G18.1 WU Plane
G19.1 VW Plan
G20 Inch Units
G21 Millimeter Units
G28 Go to Predefined Position
G28.1 Store Current Absolute Position for G28
G30 Go to Predefined Position
G30.1 Store Current Absolute Position for G30
G33 Spindle Synchronized Motion
G33.1 Rigid Tapping
G38.2 – G38.5 Probing
G38.2 Probe toward workpiece, stop on contact, signal error if failure
G38.3 Probe toward workpiece, stop on contact
G38.4 Probe away from workpiece, stop on loss of contact, signal error if failure
G38.5 Probe away from workpiece, stop on loss of contact
G40 Cutter Compensation Cancel
G41 Cutter Compensation Left of Path
G42 Cutter Compensation Right of Path
G41.1 Dynamic Cutter Compensation Left of Path
G42.1 Dynamic Cutter Compensation Right of Path
G43 Tool Length Offset
G43.1 Dynamic Tool Length Offset
G49 Cancel Tool Length Offset
G53 Motion in Machine Coordinate System
G54 Select Coordinate System 1
G55 Select Coordinate System 2
G56 Select Coordinate System 3
G57 Select Coordinate System 4
G58 Select Coordinate System 5
G59 Select Coordinate System 6
G59.1 Select Coordinate System 7
G59.2 Select Coordinate System 8
G59.3 Select Coordinate System 9
G61 Exact Path Mode (Path Control Mode)
G61.1 Exact Path Mode (Path Control Mode)
G64 Path Control Mode with Optional Tolerance
G73 Drilling Cycle with Chip Breaking
G76 Multi-pass Threading Cycle (Lathe)
G80 Cancel Canned Cycle
G81 Drilling Cycle
G82 Drilling Cycle with Dwell
G83 Peck Drilling Cycle
G85 Boring Cycle, Feed Out
G86 Boring Cycle, Spindle Stop, Rapid Out
G89 Boring Cycle, Dwell, Feed Out
G90 Absolute Distance Mode
G91 Incremental Distance Mode
G90.1 Absolute Distance Mode for Arc (I, J & K offsets)
G91.1 Incremental Distance Mode for Arc (I, J & K offsets)
G92 Coordinate System Offset
G92.1 Cancel Coordinate System Offsets
G92.2 Cancel Coordinate System Offsets
G92.3 Restore Axis Offsets
G93 Inverse Time Mode
G94 Units per Minute Mode
G95 Units per Revolution Mode
G96 Constant Surface Speed
G97 RPM Mode
G98 Retract to Start Position (Canned Cycle Z Retract Mode)
G99 Retract to R Position (Canned Cycle Z Retract Mode)

M Codes

M Code Description
M0 M1 Program Pause
M2 M30 Program End
M60 Pallet Change Pause
M3 M4 M5 Spindle Control
M6 Tool Change
M7 M8 M9 Coolant Control
M48 M49 Feed / Spindle Overrides Enable/Disable
M50 Feed Override Control
M51 Spindle Override Control
M52 Adaptive Feed Control
M53 Feed Stop Control
M61 Set Current Tool Number
M62-M65 Output Control
M66 Input Control
M67 Analog Output Control
M68 Analog Output Control
M100-M199 User Defined M codes

Binary Operators

Operator Description
* Multiplication
/ Division
OR Non-exclusive or
XOR Exclusive or
AND Logical and
MOD Modulus operation
** Power operation
EQ Equality (EQ)
NE Inequality (NE)
GT Strictly greater than
GE Greater than or equal to
LT Strictly less than
LE Less than or equal to


Function Name Function Result
ATAN[Y]/[X] Four quadrant inverse tangent
ABS[arg] Absolute value
ACOS[arg] Inverse cosine
ASIN[arg] Inverse sine
COS[arg] Cosine
EXP[arg] e raised to the given power
FIX[arg] Round down to integer
FUP[arg] Round up to integer
ROUND[arg] Round to nearest integer
LN[arg] Base-e logarithm
SIN[arg] Sine
SQRT[arg] Square Root
TAN[arg] Tangent
EXISTS[arg] Check named Parameter

Words Letters

Letter Meaning
A A axis of machine
B B axis of machine
C C axis of machine
D Tool radius compensation number
F Feed rate
G General function (See table Modal Groups)
H Tool length offset index
I X offset for arcs and G87 canned cycles
J Y offset for arcs and G87 canned cycles
K Z offset for arcs and G87 canned cycles.
             Spindle-Motion Ratio for G33 synchronized movements.
M Miscellaneous function (See table Modal Groups)
N Line number
P Dwell time in canned cycles and with G4.
             Key used with G10.
Q Feed increment in G73, G83 canned cycles
R Arc radius or canned cycle plane
S Spindle speed
T Tool selection
U U axis of machine
V V axis of machine
W W axis of machine
X X axis of machine
Y Y axis of machine
Z Z axis of machine
/ Block delete
() Comments
; Comments
MSG, Messages

Common Error Messages

G code out of range

A G code greater than G99 was used, the scope of G codes in LinuxCNC is 0 – 99. Not every number between 0 and 99 is a valid G code.

Unknown g code used

A G code was used that is not part of the LinuxCNC G code language.

i,j,k word with no Gx to use it

i, j and k words must be used on the same line as the G code.

Cannot use axis values without a g code that uses them

Axis values can not be used on a line without either a modal G code in effect or a G code on the same line.

File ended with no percent sign or program end

Every G code file must end in a M2 or M30 or be wrapped with the percent sign %.