APT or Automatically Programmed Tool is a computer language developed underthe leadership of Douglas T. Ross of MIT in 1956. It and its derivatives are still in use today. The language defines the path a cutting tool must follow using sets of coordinates (see listing 1). The program output is converted into a CL or Cutter Location file, which controls the machine. This latter control code is often produced in a standardised set of instructions defined by RS-274, known as G-code.
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机译：APT或自动编程的工具是在1956年在Douglas T. Ross的领导下开发的计算机语言。它及其衍生品仍在今天仍在使用中。 该语言定义了使用坐标组必须遵循切割工具的路径（参见清单1）。 程序输出被转换为CL或Cutter位置文件，该文件控制机器。 后一种控制代码通常是由RS-274定义的标准化指令集，称为G代码。
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