METHOD AND APPARATUS FOR CONTROLLING AN ELECTRIC DISCHARGE MACHINE

摘要

Disclosed is a method of controlling backward movement in an electric discharge machine wherein a workpiece is subjected to electric discharge machining by moving an electrode and the workpiece across which a voltage is applied, relative to one another. The method comprises a step of detecting a state of the electric discharge machining in response to a retraction command, a step of selecting a class corresponding to the electric discharge machining state from among a plurality of stored classes of retraction control information items indicating retraction control conditions different from one another, and a step of relatively moving and controlling the electrode and the workpiece in the backward direction in accordance with the selected class of retraction control information items.