CNC Machining vs. Die-Casting: Which is Right for You? CNC machining parts and die-casting parts are two of the most common manufacturing processes used to produce metal parts. CNC machining is a computer-controlled process that uses a variety of cutting tools to remove material from a work piece. Die-casting is a process that forces molten metal into a mold to create a desired shape. Read more: http://www.die-casting-china.com/