Electrical Discharge Machine (EDM) Types, Advantages and disadvantages

Electrical discharge machine is stated as a spark eroding, burning, spark machining, wire burning and die sinking equipment. This machine is used to get the desired shapes of materials by using the electrical discharges or sparks. The discharge is made between two electrodes which are separated by a dielectric liquid subject to the electric voltage. The electrodes are named the tool-electrode and the work piece electrode. The electric discharge becomes greater when the distance between the two electrodes reduces. Thus, the material gets removed from the electrodes. Fresh dielectric liquid is introduced in the inter-electrode volume. This process is also called flushing. When the current flows again the difference of potential present between the electrodes is restored before the breakdown.