| 摘要 |
A power driven lapidary device for use in automatically grinding a sheet rock blank that has a generally elliptical shape to that of a cabichon, with the ground cabichon conforming in configuration to that of a cabichon-shaped rigid pattern. Both the blank and the cabichon-shaped pattern are concurrently subjected to rotation and to two rocking motions, with the blank being in abrasive contact with a grinding wheel, and the pattern being in rotatable and slidable contact with a rigid, curved, vertically extending surface that has substantially the same radius of curvature as the outer periphery of the grinding wheel with which it is aligned. By adjusting the curved surface relative to the pattern the transverse cross-section to which the blank is ground to a cabichon configuration may be controlled.
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