Claims
- 1. An apparatus for generating a concave surface from a brittle-hard rough blank for eyeglasses (workpiece) during a CNC-controlled machining process in which the workpiece, which is blocked up, and a disk-shaped grinding tool, which has a back surface and an annular grinding lip, are moved relative to each other in two linear axes of motion (x and y axis) and two axes of rotational movement making an angle (∝) to each other, the first axis being assigned to the workpiece (b-axis) and the other axis being assigned to the tool (c-axis), characterized in that the grinding lip at its largest radius merges into a circular cutting edge, wherein the back surface of the tool, which faces away from the grinding lips also merges into the cutting edge, and wherein the angle between the back surface of the tool and the rotational axis (c-axis) of the tool corresponds to the angle (∝) between the rotational axis (c-axis) of the tool and the rotational axis (b-axis) of the workpiece.
- 2. The grinding tool as set forth in claim 1, wherein the apparatus lip is formed of sintered material in which diamond particles are finely distributed and embedded.
- 3. The grinding tool as set forth in claim 1, wherein the finely distributed diamond particles are galvanically deposited on the annular apparatus lip.
Priority Claims (1)
Number |
Date |
Country |
Kind |
195 29 786 |
Aug 1995 |
DE |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a divisional application of Ser. No. 08/695,789, filed Aug. 12, 1996 is now 5,938,381.
US Referenced Citations (7)
Foreign Referenced Citations (3)
Number |
Date |
Country |
31 25 915 AL |
Jan 1983 |
DE |
0 453 627 A3 |
Oct 1991 |
EP |
404176551 |
Jun 1992 |
JP |
Non-Patent Literature Citations (4)
Entry |
Opposition letter of Messrs. Coburn Optical Industries Inc. dated Jun. 5, 1997 (Opponent III). |
Affidavit of Raymond D. Gregory filed by (Opponent III). |
The paper filed by applicant Loh Optikmaschinen AG on Nov. 5, 1998 in response to the three oppositions. |
Bedeutung der Sonderwerkzeuge- Anwendungbeispiele für Serien mit mitteren Stückzahlen, Maschinenmarkt, Wurzbur, 82 (1976) 86, p. 1577-1580. |