3392 Runout Compensation of Rotary Electrode in Hole Electrical Discharge Machining

Abstract

In small/micro hole electrical discharge machining (EDM), rotation of a cylindrical electrode is effective in improving the circularity and machining speed. However, runout of the rotary electrode due to a tool setting error decreases the accuracy of the machined holes. In this study, a method for compensating the runout of the electrode by using a five-degrees-of freedom (5-DOF) controlled magnetically levitated (maglev) actuator was proposed. In order to evaluate the effectiveness of the proposed method, small holes were machined. The experimental results showed the diameters of the machined holes were reduced from 745μm to 668μm.