Two objectives were demonstrated in this study. One was the development of a complete processing technique to generate numerous small-diameter holes using electrical discharge machining (EDM) for Co-Cr-Mo alloy needles, for which processing conditions are unknown. Another objective was to develop a precise control technique to elute a chosen quantity of medicine. Results show that many advantageous effects on EDM were produced through precision processing: σ 0.9 μm (hole diameter variance (mm)) and low reduction of electrode wear ratio, 32% (tool consumption length (mm) / processing hole depth (mm)). The processing efficiency was high: 6 min 46 s per hole.
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