(Tool length offset command and Z pre-position line) Cnc program Footer T1 M06 (Tool call and tool change commands) G17 G20 G40 G49 G80 G90 (safety line establishing important G codes) I keep a selection of basic programs that I can copy and edit, it makes the process of writing a new program really quick. You can use these for every program you write, just copy and paste whenever you need to write a new program. In my article “ G28 G code demystified” I explain program headers and footers. G03 = counter clockwise arc or circle movement*.G02 = clockwise arc or circle movement*.
The G-codes that are marked with an * are used in conjunction with coordinates. I have listed the codes you will most likely need below. There are a lot of G and M codes, but running a hobby machine you will only need to learn a handful of them. Some of these commands are used in conjunction with coordinates to tell the machine to travel to the given points. Each code will tell the machine to execute a different process. G-code programming uses set codes with letter prefixes before numbers. It will also enable you to analyse and edit programs that have been created by CAM software.
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It is definitely an advantage to know how to read and write G code as it will make improving your cnc programs so much quicker and easier. This will depend on how much practice you have had and whether you even enjoy writing them. I say “basic” because you will need to decide when it will be easier or quicker to create a Cnc Project in a cad/cam program than it will be to write your own cnc G code. A hobbyist Cnc operator should not have any difficulty in learning how to write simple G code programs.
Basic cnc programs are not too difficult to do.
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