An electrochemical machining apparatus comprises a machining chamber for holding ultrapure water, a cathode/anode immersed in the ultrapure water held in the machining chamber, and a workpiece holding portion for holding a workpiece at a predetermined distance from the cathode/anode so that a surface,...http://www.google.de/patents/US7255778?utm_source=gb-gplus-sharePatent US7255778 - Electrochemical machining method and apparatus
