Exceeded Slender Micro-Shaft Machined by Micro-EDM Process

In this study, a micro-EDM process of exceeded slender micro-shaft is proposed. It could be divided into two parts, rough machining and finish processing. In rough machining procedure, the micro-shaft feeds along the radial and motions periodically along axial direction. High machining voltage is adopted to improve machining efficiency. In finish machining procedure, the micro-shaft feeds along radial and motions along tangential direction. Low open voltage is adopted to improve surface quality and reduce explosive force. By combining rough machining and finish machining, a high surface-quality micro-shaft with a diameter of 25μm and high aspect ratio of 120:1 was fabricated.