A method for electrochemical machining a workpiece utilizing an electrolyte that is passivating to the workpiece, wherein the conductive tool is provided with a nonconductive abrasive surface, and said tool and workpiece are brought together with a contacting relative motion so that said abrasive surface...http://www.google.es/patents/US5114548?utm_source=gb-gplus-sharePatente US5114548 - Orbital electrochemical machining
