The two most common situations are that, within a machine tool such as a lathe or mill, a cutting tool is moved according to these instructions through a toolpath cutting away material to leave only the finished workpiece and/or an unfinished workpiece is precisely positioned in any of up to nine axes around the three dimensions relative to a toolpath and, either or both can move relative to each other. G-code instructions are provided to a machine controller (industrial computer) that tells the motors where to move, how fast to move, and what path to follow. It is used mainly in computer-aided manufacturing to control automated machine tools, and has many variants. G-code (also RS-274) is the most widely used computer numerical control (CNC) programming language. Generally there is one international standard- ISO 6983. Many, mainly Siemens Sinumerik, FANUC, Haas, Heidenhain, Mazak. For the photoplotter format, see Gerber format.
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