Below is a list of Conventional EDM manufacturers from Chicago, Illinois. Conventional EDM, which is also referred to as plunge EDM, sinker EDM and ram EDM, manufactures metal parts by eroding the surface in the path of a brass electrode using electrical discharges in the form of sparks that can generate heat anywhere from 8 to 20 thousand degrees. One of the 2 major types of EDM, conventional EDM differs from its counterpart wire EDM in terms of the type of electrode used. Also, conventional EDM has 3D capacities while wire EDM can only produce 2D parts.