METHOD AND APPARATUS FOR ELECTRICAL DISCHARGE MACHINING OF AN ELECTRICALLY CONDUCTIVE WORKPIECE.

摘要

The method of electrical discharge machining of an electrically conductive workpiece by providing a series of machining power pulses thereto across a dielectric filled gap in the workpiece comprising the steps of : (a) providing a group of machining power pul ses across the machining gap at a predetermined on and off time; (b) periodically extending the off time between groups of said pulses to provide an off time which is substantially greater than the normal -predetermined off time; and (c) subsequently returning the pulses of  said groups to their predetermined on and off time.