Abstract: A method of electrolytic treatment of workpieces by the alternate and separate feeding of at least two liquid media into the working space between the tool and the workpiece, at least one of said liquid media being electrolyte, and by the separate discharge of said media after the treatment of the workpiece, the working space being supplied with a gas under pressure in the period between the feeds of said liquid media.

Abstract: Apparatus for electrochemically machining metal workpieces. An electrically conductive stationary support supports a metal workpiece to be electrochemically machined. An electrically conductive mobile support supports an electrode-tool and moves it toward the workpiece for machining and retracts it. A pair of electrical contacts are electrically connected to the stationary and mobile supports respectively. One of the contacts is mobile and moves with the mobile support axially through the other contact which is stationary. A given axial length of the mobile contact is non-conductive. This length can be determined to allow for the height of the workpieces machined. The non-conductive portion insures that the mobile contact is continuously guided on the stationary contact during its axial movement and that the contacts are in continuous slidable contact.