Abrading – Rigid tool
Patent
1995-09-21
1997-07-01
Smith, James G.
Abrading
Rigid tool
175387, B23F 2103
Patent
active
056430698
ABSTRACT:
A drill head carries a plurality of coaxially mounted drill crowns beginning with a first crown and followed by additional drill crowns which, upon rotation, describe concentric envelope circles of successively larger diameters. The first drill crown has cutting elements with a diamond coating with an average particle size of 200-1,000 .mu.m, and the additional drill crowns have cutting elements with a diamond coating with an average particle size of 200-300 .mu.m. The difference in diameter of succeeding drill crowns is successively small. Alignment of the drill crowns in a pilot hole is achieved by guide elements mounted behind the drill crowns and describing an inner envelope circle which is smaller than the outer envelope circle described by the largest drill crown, thereby defining a radial safety gap into which fluid is fed to form a cushion during rotation.
REFERENCES:
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patent: 3621548 (1971-11-01), Kinley et al.
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"Forets Couronne, Core Drills, Bohrkronen" Diamant Boart (pre 1994).
Christiansen Uwe
Knieling Dagobert
Schultheis Andreas
Banks Derris H.
Heraeus Quarzglas GmbH
Smith James G.
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