Electrical discharge #machining, also called spark erosion, uses electrical discharge to make the required cuts on the workpiece. #EDM can be used with workpieces made of conductive materials. This uses sparks transmitted from the electrode to the surface of the conductive workpiece through the dielectric fluid. By this method, very fine features can be processed, including small diameter holes, mold cavities, etc., without the need for heat treatment to soften them.
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