Electrical discharge boring apparatus.

摘要

An electrical discharge boring apparatus for boring a small hole in a workpiece (31) at high speeds comprising a working fluid jet nozzle means (40) for spouting the working fluid toward the peripheral edge (31b) of the inlet-side opening of the machined hole and a working fluid supply means (50) for supplying the working fluid to the jet nozzle means under pressure so that the working fluid at a pressure of at least 20 kg/cm<2> is flushed from the jet nozzle means. The machined chips are effectively prevented from being adhered to the peripheral edge without failing high speed machining performance. <IMAGE>