Electrical Discharge Machining (EDM), often referred to as Wire, RAM, Sinker or Conventional EDM, is a manufacturing process whereby a desired shape is obtained using electrical discharges. Material is removed from the workpiece by a series of rapidly recurring current discharges between two electrodes, which are separated by an EDM dielectric oil while being subjected to electrical voltage.
Conventional EDM is ideal for machining parts with blind holes like the hex head on allen bolts, blind keyways, and internal splines that might be used in driveshafts or pulleys or gears.
Conventional EDM is also an excellent choice for cutting the molds used for plastic injection molding. From miniature toys to automobile parts.
Tolerances to .001 of an inch are common. Depending on the hardness of the metal being machined and the current applied, mirrored finishes can be obtained. This can eliminate or cut down on the polishing process.
Used for sharp corners, fine finishes, blind cavities, and intricate details.
Workpiece hardness has no effect on the EDM cutting process. Therefore hardened parts can be easily machined using EDM.