CNC machining Copper typically involves the use of a highly specialized and accurate CNC machine tool that is able to cut complex shapes and features into pieces of copper. Depending on the application, this process will usually require cutting tools that are made from carbide or diamond tipped material in order to make a precise cut. Commonly used processes for CNC machining copper include drilling, tapping, milling, turning, boring and reaming. The accuracy achieved by these machines makes them ideal for producing intricate parts with high precision levels.