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In CNC machining, G codes and M codes work together to manufacture parts and components:
Both technologies exist to achieve similar results, however depending on the scale of your project, desired level of accuracy and your budget one will typically be a better choice than the other. In some cases a combination of the two can produce the most desirable outcome.
G-codes, also called preparatory codes, are any word in a CNC program that begins with the letter G. Generally it is a code telling the machine tool what type of action to perform, such as:
There are also other codes like for example the M-code.
List of M-codes commonly found on FANUC and similarly designed controls for milling and turning.
3D printing, also known as Additive Manufacturing, it is a term that refers to the wide range of technologies, where an item is built up in layers starting from a digital 3D file.
3D printing is the opposite of subtractive manufacturing which is cutting out / hollowing out a piece of metal or plastic with for instance a milling machine.