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Electrical Discharge Machining is a non-contact machining method that removes metal using electrical sparks generated at regular intervals to create a succession of craters in a workpiece. Any material that conducts electricity (metals, alloys, carbides, graphite) is suitable for EDM. As long as the diameter of a hair, the electrical discharge creates carefully targeted, highly precise recesses in metal regulated by highly developed electronic and mechanical systems. Depending on the intensity, frequency, duration, length and polarity of the discharges, the results are very varied. Each EDM spark produces a temperature between 8,000 and 12,000° C. The size of the crater depends on the controlled energy turned out by the spark generator. The range of the sparks varies from a few microns to 1 mm and material removal rates range from 1 to several thousand cubic millimeters per minute.