Method and instrument for determining position wire electrode is in contact with workpiece

摘要

PCT No. PCT/JP96/03309 Sec. 371 Date Jul. 28, 1997 Sec. 102(e) Date Jul. 28, 1997 PCT Filed Nov. 11, 1996 PCT Pub. No. WO97/18052 PCT Pub. Date May 22, 1997A contact position measurement method including moving either a wire-shaped tool electrode or a workpiece relative to the other within a plane, and causing the wire to approach a reference position on the workpiece; applying a voltage between the wire and the workpiece with the wire oriented perpendicular to the plane; detecting contact between the workpiece reference position and the wire; placing the workpiece reference position generally at the center of vibration of the wire, determined in accordance with the number of occurrences of detected contact; generating coordinate data indicating the position of the wire with respect to the workpiece; and determining the position of contact based on the coordinate data.