EDM Electrical discharge machining (EDM) is one of the most extensively used nonconventional, thermo electric metal removal process which encodes material from the work place by a series of discrete spark between a work and a tool electrode immersed in a liquid dielectric medium. Electrical discharge machining is basically a non-conventional material removal process which iswidely used to precision tools. This process can be successfully employed to machineelectrically conductive parts irrespective of their hardness, shape and toughness.[1-3][1] Kansal, H.K., Singh, P, Kumar, P., 2007, Technology and research developments inpowder mixed electric discharge machining (PMEDM), Journal of Materials ProcessingTechnology, 184, 3241.[2] Abu Zeid, O.A., 1997, On the effect of electro-discharge machining parameters on thefatigue life of AISI D6 tool steel. Journal of Materials Processing Technology, 68 (1),2732.[3] Ramasawmy, H., Blunt L., 2004 Effect of EDM process parameters on 3D surfacetopography, Journal of Materials Processing Technology, 148,155164.