EDM drilling machine is one kind of electronic discharge machine. The hole dimension it can cut from 0.3mm to 3mm. The maximum depth to diameter ratio can reach more than 200:1.
The processing speed is up to 5-60mm/min, can be directly from the workpiece surface, surface penetration, the hardness and toughness restricted material, in addition to the conductive material can be processed in general, but also the smoothprocessing of stainless steel, hardened steel, hard alloy, high temperature resistant materials,titanium alloy and other difficult to cut materials.     http://www.fhedm.com