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EDM is

EDM stands for Electrical Discharge Machine, there are two types of EDM’s
one is the plunge methode which uses the electricity pulsed through
graphite, or copper electrodes cut into the shape desired, it burn’s this
shape in to the steel. The other type is Wire EDM, this methode uses a
thin wire as small as 3x the diameter or a hair and again burn’s a
programed shape into the steel. In the machine trade plunge EDM is more
commonly associated with mold work, wire EDM with die work. Kevin Willis
Advantage Tool & Microweld