Abstract
The purpose of this research is to develop a micro electrical discharge machining using electrostatic induction feeding. This method can reduce the minimum discharge energy per pulse eliminating the influence of the stray capacitance in the circuit. Since non contact electric feeding is possible, this method enables EDM using a high speed rotating spindle or air bearing spindle. Gap voltage calculated from the equivalent circuit of this method agreed with the experimental results. It was thus found that the electric discharge energy per pulse can be decreased by shortening the feeding electrode length. Surface roughness of Rz 0.24μm and micro wall thickness of 1.0μm were obtained using a normal electrical discharge machine, which is difficult even with EDM machines specially designed for micro machining.
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