Abrading – Abrading process – Glass or stone abrading
Patent
1995-12-22
1998-02-24
Smith, James G.
Abrading
Abrading process
Glass or stone abrading
451 42, B24B 100, B24B 719, B24B 730
Patent
active
057206490
ABSTRACT:
A lens or lap blank surfacing machine, for use in making eyeglass lenses, and related surfacing method and rotary cutting tool, is one wherein the rotary cutting tool is moved point by point over the entire extent of a face of the blank to form a new face surface on the blank with the movements of the tool and blank relative to one another being controlled in three coordinate directions by a computer controller to give the formed surface a shape related to a given eyeglass prescription or similar specification. The rotary cutting tool has a number of peripheral zones surrounding its rotation axis with at least one of the zones having a fine cutting characteristic and with at least one other of the zones having a coarse cutting characteristic. In the movement of the tool and blank relative to one another, the tool is held so that its fine peripheral zone engages and cuts away blank material immediately adjacent the desired surface and so that the coarse peripheral zone engages and cuts away blank material to a depth not quite reaching the desired surface thereby leaving a thin layer of residual unwanted blank material which is cut away by the fine peripheral zone of the tool at a later time, this permitting the creation of a face surface of desired shape and fine surface finish.
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Gerber Heinz Joseph
Logan David J.
Murray Jeffrey J.
Wood Kenneth O.
Banks Derris H.
Gerber Optical Inc.
Smith James G.
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