Machining of EN-31 is supposed to be very difficult by conventional machining methods. A rotational electrical discharge machine (REDM) has been developed with concentration of abrasive particles in oil. Investigations have been carried out for machining EN-31 material by REDM with graphite electrodes (Ge). Analysis of REDM process parameter has made to carry out on EN-31 for Surface Roughness (R a ) with graphite electrode (G e ). The experiments have been performed with three parameters: Peak current (P c ), tool rotation (T rpm ) and abrasive concentration (A c ). The variable concentration of silicon carbide (SiC) has been used to analyse the R a at various concentration such as 60, 80 & 100 g/L. Optimal results have been obtained for process parameters, Pc – 12 amp, Trpm – 1800 rpm and Ge – 80 g/L.
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