How Does Electrical Discharge Machining Work?
It Is So Small Electrical discharge machining, or EDM, works on the molecular level of removing metal. A high voltage is passed across a probe into the work piece, and material is removed. The work piece and probe are immersed in a fluid, generally kerosene. The fluid is passed through a series of filters and cleaned to remove the particles. The Probe The probe can be machined conventionally, on a mill or lathe. This probe, once machined, is attached to a movable head piece so it can be manipulated into the work piece. An electrical current is passed through this probe, and whatever it comes in contact with, that shape will be made–a negative image of the probe. The Current A high-voltage source with a minimum current is required for the work to be accomplished. This electrical source can also be made to change its frequency so more material can be removed at an efficient rate. The higher the frequency or pulses of electrical current, the faster the material removal and the more finit
