electron discharge machining
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electron discharge machining[i′lek‚trän ′dis‚chärj mə‚shēn·iŋ]
A process by which materials that conduct electricity can be removed from a metal by an electric spark; used to form holes of varied shapes in materials of poor machinability. Abbreviated EDM. Also known as electrical discharge machining; electric spark machining; electroerosive machining; electrospark machining.