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G-Code Guru puts controller-specific G-codes, M-codes and machining know-how in your pocket. Ready at the machine. Even offline.

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ALUMINIUM / POCKET FINISHINGISOMETRIC VIEW
G01 / G02CONTOUR FINISHING

MILLING / TURNING / 3D PRINTINGIllustrative toolpath

YOUR MACHINE. YOUR LANGUAGE.7 CONTROLLER FAMILIES

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THE RIGHT REFERENCE

Different controller.
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One code can mean different things on different machines. Get the context for the control in front of you, without another browser search.

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Browse all 140 codes on this site Put the full reference in your pocket
Try a code lookup107 CODES
G81Fanuc / Milling

Drilling Cycle

Simple drilling cycle. Rapids to R-plane, feeds to Z depth, then rapids out. No dwelling or pecking.

SYNTAXG81 X_ Y_ Z_ R_ F_

Use for shallow holes (typically less than 3x diameter). For deeper holes, use G73 or G83.

Read the full G81 page
ALSO

Every entry is the one-line reference from the app. Check your machine’s documentation before running code.

MOST-READ REFERENCESFREE ON THIS SITE
G41, G42 & G40Cutter Radius CompensationRead the reference G81 & G82Drilling CyclesRead the reference G43, G44 & G49Tool Length CompensationRead the reference G54 to G59Work OffsetsRead the reference G27, G28, G29 & G30Reference Point ReturnRead the reference M06Tool ChangeRead the reference M07, M08 & M09Coolant On and OffRead the reference G73 & G83Peck Drilling CyclesRead the reference G80Canned Cycle CancelRead the reference
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From the first question to the next setup, keep your everyday tools together.

G-Code Guru Find the code app screen

All 142 G & M codes, free forever. Find what a code does and check the notes for your controller.

142 G & M codes, always free7 controller families
CNC milling tool working on a metal component

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Photo · Daniel Smyth
G-Code Guru lesson What is G-Code, with an example program and a quiz
G-Code Guru lesson Work Offsets G54 to G59
G-Code Guru code challenge Cut an Arc, with starter code, hints and a check button
GO BEYOND THE CHEAT SHEET

Learn the code.
Understand the cut.

New to CNC? Changing machines? Work through 55 lessons in 11 modules, from motion and coordinates to macros and multi-axis work, and build knowledge that stays with you after you put your phone away.

Understand motion, coordinates and the structure of a G-code program.

55lessons
11modules
163quiz questions
15code challenges
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All 142 codes.
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Every G-code and M-code in the reference is free, always, along with the editor, speeds and feeds and the first two learning modules. Pro unlocks the rest, and you choose how to pay for it.

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EVERYTHING IN PROBOTH PLANS
55 lessons, 163 quizzes & a knowledge base11 modules with code challenges, plus 43 articles on chip load, tool materials and best practice.
600+ handbook specsDrills, inserts, holders, threads, taps and clearance holes, derived from the published standards.
164 controller alarm codesFanuc, Haas, Siemens, Mazak, Okuma, Grbl and Marlin. Likely causes and what to check, offline.
Speeds, feeds, trig & holemakingRPM, chip load with radial chip thinning, tapping and thread milling.
Fits, hardness & surface finishISO 286 limits for any diameter from 1 to 500 mm, Rockwell to Brinell to Vickers, Ra and Rz.
GD&T reference14 characteristics and 7 modifiers, with the feature control frame explained.
Code editor with safety checksCheck your program. Scan and analyse code straight from the machine.
Unlimited saves & exportsKeep useful work. Export .nc files for the controller.
3D toolpath visualisationSimulation and collision detection, shown as it takes shape.COMING SOON
STRAIGHT ANSWERS

Frequently
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The things machinists ask before they download. If yours is not here, write to [email protected].

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