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Electric discharge machining using forming tool electrodes to perform simple feed motion relative to the workpiece; Using axially moving metal wires as tool electrodes, the workpiece moves in a trajectory according to the required shape and size to cut conductive materials through wire cutting; Electric discharge grinding using metal wires or formed conductive grinding wheels as tool electrodes for small hole grinding or forming grinding; Used for machining thread ring gauges, thread plug gauges, gears, etc. with electric discharge conjugate rotary machining; Other types of processing such as small hole machining, surface alloying, and surface strengthening.