CNC Wire erosion:

CNC wire erosion or EDM (Electronic Discharge Machine) works on the principle of spark generation and metal removed by spark erosion. It is a very accurate process which uses a wire strand to cut through the material. While also being highly accurate wire erosion is also cost effective. Detailed shapes and designs can be made from quite difficult materials making it even more useful. The benefits of using wire erosion include being useful on harder materials while keeping accuracy and size.