Wire-cut, electric discharge machining method for automatically measuring a required offset value

摘要

During machining of a workpiece, the feed of the wire electrode and the discharge for the machining are stopped and the wire electrode is moved in a direction perpendicular to the machining path until it contacts the wall of the workpiece. The size of the spark gap is then detected from the position where the wire electrode contacts the workpiece. A desired offset value is calculated from the detected size of the spark gap and the known wire diameter. The machining path is corrected so that the center of the wire electrode lies at a position offset by the desired offset value relative to a desired profile.