G-Codes
70Welcome to G-Codes Hubpage!
What is a G-Code?
G-Code is the common name for the programming language of CNC Machines. Somewhat of a generic, catch-all type of term for CNC programming language. Very few machines adhere to this standard today. There are as many variations as there are manufacturers.
This is how I think of G-Code. It is a simple language built off of the Cartesian Coordinate System for motion control. That is a mouthful. I don't know if that is exactly right, but you will get my meaning in a second when we go through some code line by line. You will remember your High School Geometry soon enough. For the real pros out there, you know there is much more to G-Code then that, but it is a good place to start thinking about it.
You will see many variations of the G-Code name like:
Gcode
gcode
G-Code
g-code
G Code
G-Code
Are there other "Codes?"
In a word, Yes. We will get to that in a moment. G-code is also the name of any command in a CNC program that begins with the letter G. G-Codes generally tell the machine to perform an action. G-Codes can tell machines to move a certain distance in the X-Axis for example. Or, make a rapid move to another location. Or, move in an arcing fashion while milling. An on and on and on.
Here are some examples of G-Codes
Remember these codes change to a certain degree between CAM Software packages and CNC Machine Manufacturers.
G00 Rapid positioning
G01 Linear interpolation
G02 CW circular interpolation
G03 CCW circular interpolation
G04 Dwell
G20 Programming in inches
G21 Programming in mm
G28 Return to home position
G40 Tool radius compensation off
G41 Tool radius compensation left
G42 Tool radius compensation right
G43 Tool offset compensation positive
G44 Tool offset compensation negative
Why does G-Code Change?
We humans like flexibility. We also like standards. G-Codes are standardized in a certain sense. Once you start to be able to read it, you can read just about any flavor of it. That is the standardized part.
All machines are not created alike. Even identical machines are different to a certain degree. They may not have the same tools loaded or they have been slightly modified to produce a certain type of part. Interesting how people like to customize.
That is why G-Codes are not the same. You need some flexibility in the programming to accommodate all situations. Couple that with the fact that every manufacturer thinks their version is the best and you get a myriad of G-Codes out there.
Many manufacturers also try to force you to only use their code. For example, they give you a design interface to make parts and a CAM interface to produce code. They lock you into their "Black Box" so you can't go elsewhere for service and support. They lock you in their "Family." Sometimes they make up a completely different kind of G-Code language that no one can understand but them. They do that to keep your hands tied up.
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G-Code Links
- G-Codes Information
This link will help you answer the question, What is G-Code? and help you find a lot of information on CNC. - G-Code Definition
Learn the definition of G-code! - ASK.COM
Find several links to g-code information here.
G-Codes in Yahoo News
- G-code - Wikipedia, the free encyclopedia
The G-codes are the codes that position the tool and do the actual work, as ... But in actuality, G-codes are only a part of the NC-programming language that ...
- GCODES
- G-Codes - Milling
G-Codes - Milling. G00. G01. G02. G03. Linear Rapid ... Return To Initial Point In Canned Cycle. Return To Ref Point In Canned Cycle. G-Codes - Turning ...
G-Codes in Google Blog News
- Download CNC Syntax Editor, CNC Syntax Editor Download - Getabest.com
The application is capable of all types of ASCII CNC files and G codes, ensuring optimum performance even on larger files. CNC Syntax Editor can highlight program syntax and visually split commands and coordinates into groups, ...
- What Do U Mean By Cnc Machine In Electrical / Technical Terms?
A more recent advancement in CNC interpreters is support of logical commands, known as parametric programming. Parametric programs incorporate both G-code and these logical constructs to create a programming language and syntax similar ...
- CNC Milling Machine Buying Tips
This specially coded program that is used by CNC Milling machines is written in a notation called G-code. G-codes represent specific CNC Milling functions in alphanumeric format. CNC Milling was developed in the late 1940's and early ...
CNC Programming in Google News
- Clemson engineering program receives state-of-the-art machining software - Clemson University
Clemson engineering program receives state-of-the-art machining software Clemson University It is with this expectation that we are pleased to partner with Clemson University, by providing them a world class CNC programming system for their ... and more » - 6 days ago
- MANUFACTURING ENGINEER - Hartford Courant
MANUFACTURING ENGINEER Hartford Courant Must be knowledgeable of CNC programming, equipment & tooling applications as well as application process control (ie SPC). BS Degree in Engineering or ... - 3 weeks ago
- GibbsCAM Adds High-Speed Rough Machining Option - American Machinist
GibbsCAM Adds High-Speed Rough Machining Option American Machinist Celeritive Technologies' VoluMill high-speed rough machining software is available now for GibbsCAM CNC programming software, according to Gibbs and ... and more » - 5 days ago
G-Codes on Amazon
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CNC Programming Handbook, Third Edition
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7 Easy Steps to CNC Programming. . .A Beginner's Guide
Price: $24.50
List Price: $24.50 |
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Student Workbook for Programming of CNC Machines, Second edition
Price: $18.87
List Price: $21.50 |
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Hello Khalid,
Good to have you here. Glad you liked it.
Ivan
hey you should reference my site because you are pulling images from my page, and info as well. thanks.









khalid says:
2 years ago
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