EDM Adds Spark to Metalcutting
Electrical discharge machining (EDM), also known as spark erosion machining, is a nontraditional method of removing metal by a series of rapidly recurring electrical discharges (that are the equivalent of tiny lightning bolts) between an electrode (the cutting tool) and the workpiece in the presence of dielectric fluid.
Electrical discharge machining (EDM), also known as spark erosion machining, is a nontraditional method of removing metal by a series of rapidly recurring electrical discharges (that are the equivalent of tiny lightning bolts) between an electrode (the cutting tool) and the workpiece in the presence of dielectric fluid. Minute particles of metal or chips, generally in the form of hollow spheres, are removed by melting (at 10,000°C) and vaporization. The process occurs on such a tiny scale that the resulting metal removal can be precisely controlled.
The electrode in EDM takes different forms. Wire EDM machines use a process similar in configuration to bandsawing, except in the case of the wire EDM, the “saw” is a small diameter wire electrode.