Stone working – Splitting – shearing – and punching
Patent
1992-03-09
1993-09-28
Parker, Roscoe V.
Stone working
Splitting, shearing, and punching
125 39, 761082, 76DIG12, 21912172, 21912185, B28D 500, E21B 1000
Patent
active
052479234
ABSTRACT:
A method of forming a substantially hemispherically shaped diamond cutting element for use in a rotary drill bit is provided. A natural diamond is obtained and then cleaved to form a planar surface. A portion of the diamond is trimmed in the shape of a first truncated cone by directing a laser toward the planar surface from a predetermined angle and rotating the diamond in a circle about the central axis. The excess diamond produced by the trimming step is removed by directing the laser toward the diamond, from a direction substantially parallel to the planar surface, and rotating the diamond in a circle about the central axis. Then, a second truncated cone is created by directing a laser toward a lower portion of the first truncated cone from a predetermined angle and rotating the diamond in a circle about the central axis. If desired, the trimming and removing steps are alternately repeated, and the predetermined angle of the laser is successively adjusted. Thus, a series of truncated cones approximating a hemisphere is formed.
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Catalog entitled "Diamond Drilling," of Diamant Boart, place of pulbication unknown.
Catalog entitled "J-K-S Diamond Bits," of J-K-Smith & Sons Diamond Tools Ltd., place of publication unknown.
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