In a wire cut electric discharge machine, a correction block is inserted into a corner of a movement path where the wire electrode is moved by the electrode moving device. The correction block does not correspond to the contour of the workpiece to be machined. When it is necessary to change machining...http://www.google.de/patents/US6832126?utm_source=gb-gplus-sharePatent US6832126 - Control apparatus for wire cut electric discharge machine