An investigation was done on composites containing AA6061-T6 as matrix and 15wt.% of SiC as reinforcement, where an AA6061-T6/15% SiC alloy was fabricated by stir casting methodology to achieve optimal conditions for machinability analysis utilizing electrical discharge machining (EDM). Taguchi-based L27 orthogonal array-based design of experiments was employed for experimentation to investigate the effect of process parameters like peak current (IP), pulse on time (Ton) and gap voltage (V) on material removal rate (MRR), tool wear rate (TWR), circularity (CIR), cylindricity (CYL) and perpendicularity (PP). An entropy method weights incorporated with the additive ratio assessment (ARAS) approach was used to estimate the best optimum level of input parameters. The weights were 0.087, 0.264, 0.244, 0.147 and 0.259 for MRR, TWR, CIR, CYL and PP. From the ARAS method of utility degree, the optimal conditions are obtained in the fourth experiment having the 12 A, 50 μs and 40 V with the utility degree of 0.8883. By using an scanning electron microscope, the machined surface is analysed for the microstructural examination, at higher peak current (IP) micro-voids and craters with a poor surface finish were achieved.