Most Common Types of Precision CNC Machining Precision CNC Machining is a practice where machines function by trimming or cutting excess raw materials and shape work pieces according to its planned design. The objects produced are precise and achieve the specified measurement programmed to the CNC machines. The most common processes are milling, turning, cutting, and electrical discharge. These machines are applied to industries, such as: Industrial, Firearms, Aerospace, Hydraulics, and Oil and Gas. They work well with a variety of materials, from plastics, wood, composites, metal, and glass to bronze, steel, graphite, and aluminum, to produce parts and other work pieces.