CNC machining relies heavily on programming. Human programmers have to type in the correct codes and make sure they work. Without code, there is no CNC machining.
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The language behind CNC machining is also known as G-code. Most manufacturing machines have codes to dictate one or both functions. G-code is much more complicated than that.
G-code will control many different behaviors in a CNC machine. These include speed, feed rate, and coordination.
Once the G-code is written and fed into the machine, little human intervention is required. The code does most, if not all, of the work for them.