Electric discharge machining (EDM), sometimes colloquially also referred to as spark machining, spark eroding, burning, die sinking, wire burning or wire erosion, is a manufacturing process whereby a desired shape is obtained using electrical discharges (sparks). Material is removed from the workpiece by a series of rapidly recurring current disch...
Found on
http://en.wikipedia.org/wiki/Electrical_discharge_machining
(from the article `machine tool`) EDM involves the direction of high-frequency electrical spark discharges from a graphite or soft metal tool, which serves as an electrode, to ... ...uses the principle of metal plating in reverse, as the workpiece, instead of being built up by the plating process, is eaten away in a controlled ... [2...
Found on
http://www.britannica.com/eb/a-z/e/18
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