Aluminium, Magnesium and its alloys are preferred wheneverweight reduction is needed without compromising its strength. Both alloys have been used in numerous fields like in aerospace, defence field, automobile wheeling parts and also, they have been used in Medical field because of their biodegradability. In this study, Statistical investigation on surface roughness in Electric discharge machining of aluminium and Magnesium using Taguchi optimization Technique has been reported. Electric discharge machining was carried out under the condition of Current (5, 10, 15 A), Voltage (50, 55, 60 V), Pulse On time (10, 20, 30 µs) and constant flushing pressure of 0.50 Kg/sq.cm. Twenty-seven Experiments are carried out based on L27 orthogonal array. After machining the surface roughness (Ra, Rq, Rz) of the machined surface is measured using SURFTESTSJ-210. Optimizations of the results were done by Taguchi technique and the optimal parameters for the machining operation of aluminium and magnesium are determined. It is found that for Ra, Rq and Rz the most influencing factor is Current followed by the pulse on time, pressure and voltage.
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