Patent ID: 6310313
Filing Date: 2001-10-30
Classification: B23H

Abstract:
An electrical discharge apparatus for machining a workpiece, the electrical discharge apparatus comprising:an electrode;means for supplying working electric power to a gap between the workpiece and the electrode provided in a working fluid;first electrode jumping means for causing said electrode to jump with respect to the workpiece, in which an amount of rise during a first electrode jump is set as one machining condition;second electrode jumping means for causing said electrode to jump with respect to the workpiece, in which an amount of rise during a second electrode jump is set such that balls or rollers used on a sliding portion of a mechanically driven part of said electrical discharge apparatus undergo one revolution or more; anda unit for making a comparison between the amount of rise during the first electrode jump and the amount of rise during the second electrode jump,wherein, when the amount of rise during the first electrode jump is smaller than the amount of rise during the second electrode jump, the second electrode jumping operation is effected in addition to the first electrode jumping operation.