抄録
Electrical discharge machining (EDM) was not available for the YBCO superconductor (YBa_2Cu_3O_<7-δ>) because of the anomalous electrical characteristics. We tried to machine the sintered YBCO by the sinker EDM with an assisting electrode method, and we have successfully processed a hole drilling of 3mm in diameter -3mm in depth. The EDM characteristics of YBCO superconductor indicate anomalous machining behaviors and conditions such that the significant low duty factor of the pulse was required on the stable machining condition.
