Device for the fine machining of a circumferential workpiece surface and method for operating the device

A method for operating a device for the fine machining of a circumferential workpiece surface arranged eccentrically relative to an axis of a workpiece, the method comprising:

• providing a pressure mechanism comprising pressure elements configured to press a fine-machining tool against the circumferential workpiece surface so as to create a form-fitting engagement between the pressure elements and the circumferential workpiece surface;
• driving an active section of the pressure mechanism with a drive unit that comprises a first drive and a second drive, the first drive driving the active section in a movement plane that runs crosswise to the workpiece axis along a first movement trajectory, and the second drive driving the active section along a second movement trajectory that is at an angle to the first movement trajectory,
• establishing an operative connection between both the first drive and the pressure mechanism and the second drive and the pressure mechanism, and
• undoing the operative connection between both the first drive and the pressure mechanism and the second drive and the pressure mechanism,
• wherein, when the operative connection is established, the first drive and the second drive are mechanically coupled to the pressure mechanism such that the first drive and second drive are configured to control a position of the active section within the movement plane that runs crosswise to the workpiece axis irrespective of a position of the circumferential workpiece surface,
• wherein, when the operative connection is undone, the first drive and the second drive are mechanically uncoupled from the pressure mechanism such that the first drive and the second drive are unable to control the position of the active section such that the pressure mechanism passively follows a movement of the circumferential workpiece surface due to the form-fitting engagement, and
• wherein at least one of the movement trajectories has a shape of a circular arch.