Abstract
ABSTRACT: Electric Discharge Drill Machine (EDDM) is a spark erosion machining process to generate micro holes in hard to machine and conductive materials. This process is used in space and aerospace, medical and automobile industries. In present research work a brass rod 2 mm diameter was used as a tool electrode. The best parameters such as pulse on-time, Pulse off-time and water pressure were studied for best surface quality. This investigation presents the use of Taguchi approach for better SR in drilling of AA-7075. L27 Taguchi design method was selected for planning of experiments. The optimal levels and the significant drilling parameters on SR were obtained. The optimization results showed that the combination of minimum pulse ontime and maximum pulse offtime gives best SR.
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