Patent ID: 7066794

Claim:
A tool ( 10 ) for fine machining of optically active surfaces (F), in particular free form surfaces and toric surfaces on spectacle lenses (L), comprising a base body ( 12 ) that can be attached to a tool spindle of a machine tool, an elastic membrane ( 14 ) with a machining section ( 16 ) followed by a gaiter section ( 18 ) by means of which the membrane ( 14 ) is attached to the base body ( 12 ) so that it can be rotated therewith, a pressure medium chamber ( 20 ) delimited by the base body ( 12 ) and the membrane ( 14 ) which can be pressurized selectively with a pressure medium via a channel ( 22 ) in order during the machining of the optically active surface (F) to exert a machining pressure via the machining section ( 16 ), and a guide element ( 24 ) guided longitudinally displaceable on the base body ( 12 ) and actively connected with the machining section ( 16 ) of the membrane ( 14 ) so that the machining section ( 16 ) is mobile in the longitudinal direction of the guide element ( 24 ) and held in the transverse direction to the guide element ( 24 ), although under an elastic deformation of the gaiter section ( 18 ) it is tilt-mobile in relation to the guide element ( 24 ).