The cnc machining process is the use of computer software to control the motion of machine tools such as lathes, milling machines, and lasers to produce precision parts using a variety of materials, including metals, plastics, and composites. The cnc machining process involves several steps, starting with the The design of the parts begins. This usually involves creating a computer-aided design (CAD) model of the desired part and then using that model to create a detailed drawing of the part, including its dimensions and features.