Abstract: This machine is designed for dressing fixed-super-abrasive tools employed in the grinding and polishing of optical and ophthalmic lenses having a toric surface configuration. It comprises a base with an upstanding frame having an arm pivotally supported thereon for at least limited vertical arc-like oscillatory movement about the horizontal axis. A workpiece holder assembly suitable for holding the fixed-super-abrasive tool is releasably securable to the arm and movable along the arm to any predetermined position relative to the horizontal axis whereby the workpiece in the workpiece holder assembly is vertically oscillated at a preselected radius. The base also includes a grinder support bed both horizontally movable with respect thereto and controllably rotatable about a vertical axis through at least a limited horizontal arc.

Abstract: This improved fixed-super-abrasive tool for grinding and polishing toric and other curvilinear lenses is produced by a novel method of manufacture and comprises a substantially-rigid, super-abrasive-free backing member and a malleable preformed super-abrasive wafer conformed and releasably secured thereto. The substantially-rigid, super-abrasive-free backing member has a curved support surface determinative of the curvature of the curvilinear working surface. The substantially-malleable preformed abrasive wafer has a predetermined thickness and one surface which, in the method of the present invention, is conformed to the curved support surface, either before or at the time of securing. The wafer comprises super-abrasive particles having a Knoop Hardness in excess of about 3000 kg/mm.sup.2 in a malleability-imparting powdered metal matrix, which facilitates the conformation step.