Abstract
This paper describes the machining characteristics of electrolysis free micro EDM in water using the electrostatic induction feeding method. With the electrostatic induction feeding method, since a bipolar voltage is applied to the working gap, electrolysis can be prevented when deionized water is used for the working liquid. Results of micro-holes drilling showed that the material removal rate with deionized water is higher than that with oil, and the oversize of holes machined in deionized water is smaller. Moreover, micro-holes were drilled successfully even in a tap water with the oversize of several micrometers using this method.
