Wire EDM (electrical discharge machining) is a process whereby a wire typically .006 inch to .008 inch in diameter is electrically charged at a very high voltage and used to cut precision shapes in prismatic components.  The wire passes from one spool to another and is guided by an upper and lower guide as it cuts.  There are numerous advantages to wire EDM machining such as the ability to cut very precisely, cut nearly square internal corners and cut tapers that would be virtually impossible to cut otherwise.

Plunge EDM         

Plunge EDM utilizes a charged electrode to drill microfine homes and create cavities and complex shapes in hard-to-machine metals.