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Metal Forming Co: Quality and Dependability. Material is removed from the workpiece by a series of rapidly recurring current discharges between two electrodes, … Following this, in 1969, the first numerically controlled EDM machine was built. Mirror like finish machining, surface … Electrical discharge machining (EDM), also known as spark machining, spark eroding, die sinking, wire burning or wire erosion, is a metal fabrication process whereby a desired shape is obtained by using electrical discharges (sparks). In their efforts to exploit the destructive effects of an electrical discharge, they developed a controlled process for machining of metals. Electrical Discharge Machining Used on hard metals works with electrically conductive materials HISTORY OF EDM In1770s, discovered by Joseph Priestly. However, Electrical Discharge Machining was not fully taken advantage of until 1943 when Russian scientists learned how the erosive effects of the technique could be controlled and used for machining purposes. Using computer programming the whole process can be plugged in to provide accuracy and prevent human error from occurring. Furthering Priestley's research, the EDM process was invented by two Russian scientists, Dr. B. R. Lazarenko and Dr. N. I. Lazarenko, in 1943. Electrical discharge machining Last updated December 28, 2020 An electrical discharge machine. The main limitation of Electrical Discharge Machining is that it can only cut materials that are electrically conductive. The tool and workpiece is immersed in a dielectric medium (kerosene or deionized water). At its beginning, it was developed as a precision machining method for hard materials. Introduction to Electric Discharge Machining 1. In Electrical discharge machining; a potential difference is applied across the tool and w/p in pulse form. As the potential difference is applied, electrons from the tool start to move towards the workpiece. He noticed that electrical discharges had removed material from the electrodes in his experiments. Electric discharge machining (EDM) is sometimes called spark machining and uses a spark discharge to remove material from a workpiece. The erosive effect of electrical discharges was first noted in 1770 by English physicist Joseph Priestley. Their initial process … When a spark is ignited in the liquid, the metal struck by the spark is melted. In 1770, an English scientist, theologian, chemist, philosopher and political theorist named Joseph Priestley made many discoveries; he is perhaps best known for discovering oxygen. 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