EDM Drilling (Small Hole EDM) is a specialized type of Electrical Discharge Machining (EDM). Its operating principle is based on applying a pulsed electrical voltage between a conductive metal electrode and the workpiece, which generates dense, high-temperature electrical sparks in the gap between them.
These electrical discharges locally melt and vaporize the workpiece material. The eroded metal particles are then flushed away from the machining area by the dielectric fluid, gradually forming the required micro-sized holes ...