What is electrical discharge machining (EDM)?

Electrical Discharge Machining (EDM) is a non-contact, electro-thermal manufacturing process that shapes electrically conductive materials through high-frequency electrical spark discharges. Controlled electrical pulses jump across a microscopic spark gap between an electrode tool and the workpiece, both submerged in an insulating dielectric fluid. Each spark generates localized heat exceeding 8,000°C, melting and vaporizing microscopic metal particles that the circulating dielectric fluid flushes away. Because the process produces zero direct mechanical cutting force, EDM machines hardened tool steels, carbide, and heat-treated superalloys without tool chatter, physical deflection, or internal part stress.

The three primary types of EDM are Die-Sinking EDM, Wire EDM WEDM, and Hole Drilling EDM