Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1978-05-12
1980-08-12
Whitehead, Harold D.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51124L, B24B 1302
Patent
active
042166268
ABSTRACT:
Machine for grinding and polishing workpieces having a spherical surface, such as spectacle glasses, optical lenses, and the like, including a workpiece support disposed for rotation about a generally vertical axis for mounting the workpiece for exposure during the machining operation to the action of a work tool operatively applied under pressure against the workpiece for carrying out such action, the workpiece support having a spherical workpiece receiving surface provided with a predetermined radius of curvature generally corresponding to that of the spherical surface of the workpiece to be operatively mounted thereon and situated such that the center of the radius of curvature coincides with the rotation axis of the workpiece support, a work tool holder such as a pressure spindle sleeve for operatively holding the work tool for carrying out the grinding and polishing action and for maintaining the work tool against the workpiece under the applied pressure, a rocker connected to the work tool holder to form a unit therewith and mounted for reciprocating movement about a pivot axis arranged generally normal to the rotation axis of the workpiece support, and a reciprocating drive such as a crank drive for effecting reciprocating movement of the rocker and work tool holder, in which the reciprocating drive is provided with reciprocating means having an invariable or constant operative amplitude of reciprocating movement such as crank arm means having an invariable operative crank radius and corresponding amplitude of crank reciprocating movement, and in which an intermediate selectively variable drive transmission means is further provided.
REFERENCES:
patent: 1199519 (1916-09-01), Arnold
patent: 2435126 (1948-01-01), Burch
patent: 3782042 (1974-01-01), Strasbaugh
Prontor-Werk Alfred Gauthier G.m.b.H.
Whitehead Harold D.
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