Abstract: Apparatus for producing convex and/or concave spherical surfaces such as optical lenses, comprising a workpiece spindle having an end face to which a workpiece to be machined is securable and a tool spindle carrying a tool for machining the workpiece, the two spindles being disposed at an angle to one another, and a mechanism for retaining the tool spindle in its angular position relative to the workpiece spindle including two mutually adjustable members,the first of said members being mounted so as to be pivotable about a primary axis which is tangential to the apex of the spherical surface to be produced and which axis is formed on a frame for the apparatus, the first member being adjustably locatable at a pre-selected angle of inclination commensurate with the radius of the spherical surface to be machined,the second of said members having the tool spindle directly mounted thereon and being mounted about a secondary axis on the first member such that the axes of mounting of the two members extend substanti

Abstract: Clampable apparatus for producing convex and/or concave spherical surfaces such as optical lenses, comprisinga frame, a swivel arm in the form of a gantry and mounted on the frame such that its angle of inclination relative thereto is adjustable, the swivel arm including two spaced apart support portions, a rocker arm pivotally and adjustably mounted on an axle extending between the support portions, the rocker arm having a spindle sleeve housing axially displaceably mounted thereon, the housing receiving a rotatably mounted tool spindle carrying a machine tool, a workpiece spindle supporting a workpiece being rotatably provided at the frame, the tool and workpiece being locatable in the plane of the tool spindle axis of rotation, the rocker arm and swivel arm being selectively adjustably locatable and securable in a desired position, and a pair of clamping devices,wherein such arms are retained in such position by the clamping devices, and such clamping devices are substantially identical and symmetrically d