Abstract
The need for machining hard and high strength materials is ever increasing to meet the demands of today requirements. Electrical discharge machining (EDM) is one of these tools used in recent years to cope with these demands. Particular emphasis on the potential of this process was given to surface modification. The influence of EDM parameters on the surface finish of EDMed material was explored. Moreover, this work adopted L9 orthogonal array based on Taguchi method to conduct a series of experiments to optimize the EDM parameters. Experimental data were evaluated statistically by analysis of variance (ANOVA). The EDM parameters are Pulse current (Ip), Pulse –on- time (Ton), Pulse –off- time (Toff), and the Gap voltage (Vg) , while the machining responses in concern are the surface roughness of the machined surface and the over-cut. The experimental results have given optimal combination of input parameters which give the optimum surface finish of the EDMed surface.