G-Codes

Full List Of G Codes For Milling And Turning

* Press the G-Code to read the full explanation

Code What it Does Milling Turning
Rapid positioning ✔ ✔
Linear interpolation ✔ ✔
Circular interpolation, clockwise ✔ ✔
Circular interpolation, counterclockwise ✔ ✔
Dwell ✔ ✔
High-precision contour control (HPCC) ✔ ✖
AI Advanced Preview Control ✔ ✖
Non-uniform rational B-spline (NURBS) Machining ✔ ✖
Imaginary axis designation ✔ ✖
Exact stop check, non-modal ✔ ✔
Programmable data input ✔ ✔
G11 Data write cancel ✔ ✔
XY plane selection ✔ ✖
ZX plane selection ✔ ✔
YZ plane selection ✔ ✖
Programming in inches ✔ ✔
Programming in millimeters (mm) ✔ ✔
Return to home position (machine zero, aka machine reference point) ✔ ✔
Return to secondary home position (machine zero, aka machine reference point) ✔ ✔
Feed until skip function ✔ ✔
Single-point threading, longhand style (if not using a cycle, e.g., G76) ✔ ✔
G33 Constant-pitch threading ✔ ✖
Single-point threading, longhand style (if not using a cycle, e.g., G76) ✖ ✔
G34 Variable-pitch threading ✔ ✖
Tool radius compensation off ✔ ✔
Tool radius compensation left ✔ ✔
Tool radius compensation right ✔ ✔
Tool height offset compensation negative ✔ ✖
Tool height offset compensation positive ✔ ✖
G45 Axis offset single increase ✔ ✖
G46 Axis offset single decrease ✔ ✖
G47 Axis offset double increase ✔ ✖
G48 Axis offset double decrease ✔ ✖
Tool length offset compensation cancel ✔ ✖
Define the maximum spindle speed ✖ ✔
Scaling function cancel ✔ ✖
Position register (programming of vector from part zero to tooltips) ✖ ✔
Local coordinate system (LCS) ✔ ✖
Machine coordinate system ✔ ✔
Work coordinate systems (WCSs) ✔ ✔
Extended work coordinate systems ✔ ✔
Exact stop check, modal ✔ ✔
G62 Automatic corner override ✔ ✔
Default cutting mode (cancel exact stop check mode) ✔ ✔
Rotate coordinate system ✔ ✖
Turn off coordinate system rotation ✔ ✖
Fixed cycle, multiple repetitive cycle, for finishing (including contours) ✖ ✔
Fixed cycle, multiple repetitive cycle, for roughing (Z-axis emphasis) ✖ ✔
Fixed cycle, multiple repetitive cycle, for roughing (X-axis emphasis) ✖ ✔
Fixed cycle, multiple repetitive cycle, for roughing, with pattern repetition ✖ ✔
Peck drilling cycle for milling – high-speed (NO full retraction from pecks) ✔ ✖
G74 Peck drilling cycle for turning ✖ ✔
G74 Tapping cycle for milling, lefthand thread, M04 spindle direction ✔ ✖
G75 Peck grooving cycle for turning ✖ ✔
Fine boring cycle for milling ✔ ✖
G76 Threading cycle for turning, multiple repetitive cycle ✖ ✔
Cancel canned cycle ✔ ✔
Simple drilling cycle ✔ ✖
Drilling cycle with dwell ✔ ✖
Peck drilling cycle (full retraction from pecks) ✔ ✖
Peck drilling cycle (full retraction from pecks) ✔ ✖
Tapping cycle, righthand thread, M03 spindle direction, rigid toolholder ✔ ✖
Tapping cycle, lefthand thread, M04 spindle direction, rigid toolholder ✔ ✖
boring cycle, feed in/feed out ✔ ✖
boring cycle, feed in/spindle stop/rapid out ✔ ✖
boring cycle, backboring ✔ ✖
G88 boring cycle, feed in/spindle stop/manual operation ✔ ✖
boring cycle, feed in/dwell/feed out ✔ ✖
Absolute programming ✔ ✔
Fixed cycle, simple cycle, for roughing (Z-axis emphasis) ✖ ✔
Absolute arc programming ✔ ✖
Incremental programming ✔ ✔
Incremental arc programming ✔ ✖
Position register (programming of vector from part zero to tool tip) ✔ ✔
Threading cycle, simple cycle ✖ ✔
Feedrate per minute ✔ ✔
Fixed cycle, simple cycle, for roughing (X-axis emphasis) ✖ ✔
Feedrate per revolution ✔ ✔
Constant surface speed (CSS) ✖ ✔
Constant spindle speed ✔ ✔
Return to initial Z level in canned cycle ✔ ✖
Feedrate per minute (group type A) ✖ ✔
Return to R level in canned cycle ✔ ✖
Feedrate per revolution (group type A) ✖ ✔
Tool length measurement ✔ ✖

What Is G-Code?

G-codes and CNC (Computerized Numerical Control) are two different types of programming that machines use to create a shape. In its most simplistic terms, G-codes are sets of instructions that program a machine to create a shape but require a true beginning and endpoint to work correctly. On the other hand, CNC codes are created by a computer to create different shapes without much precision.

The G-codes are commands that provide a range of motion and control functions, depending on the tool being used and the system running it. The G-codes also identify what tool is being used, along with the axis of rotation, travel limits, and electrical system voltages.

G-Code Syntax

Sample short program
N10   O1000;
N20   T05;
N30   G01   A10   X40   Z60   F1.0   S1000;
N40   M05;
LETTER ROLE
X,Y,Z,A,B,C Coordinates for Movement
F Feedrate - At what speed to move to the next coordinate.
S Spindle Speed - At speed the spindle should be rotating.
I,J,K Arc center for G02/G03
O Program Number
N Line (Block) Number
M Miscellaneous function - See separate List
T Select a tool from Magazine / Turret
P Parameter Number