Abstract
The electrolyte descharge system where an electrolyte is provided from a nozzle and the machining is performed by a tool at the center of the nozzle is prepared. In this system, an onset of the machining under a thin fluid depth is possible, although a higher voltage than that in the previous system with an electrolytic cell is necessary. In the drilling of glass, a high voltage is obtained for a positive polarity compared with that for a negative one. Therefore, the removal rate is high and the taper of the machined hole is small. The supply of square wave DC brings an increase in the voltage and a noticeable improvement of the removal rate.
