Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1987-07-06
1989-08-22
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51209R, 51219R, B24B 700, B24B 900
Patent
active
048583898
ABSTRACT:
Apparatus for grinding twist drills comprises a drive shaft and a grinding wheel, which is coupled to said shaft and is mounted thereon to be axially movable and tiltable relative to the shaft and is spring-loaded toward a drill-guiding structure facing the grinding surface of the grinding wheel. The drill-guiding structure comprises guiding passages for guiding drills differing in diameter against the grinding surface and in association with each grinding passage comprises at least one guide lug for extending into a flute of a twist drill extending through the associated guiding passage, and a drill stop for limiting the advance of the twist drill in the guiding passage against the elastically yielding grinding wheel. To the drill-guiding structure a plurality of peripherally spaced apart abutments are connected which are engageable by the grinding surface and have a higher hardness than the grinding wheel, the abutments limiting the displacements of the grinding surface toward the drill-guiding structure under spring force in an end position in which the grinding surface is closer to the guide lugs than the drill stop. The grinding surface is interrupted by openings in that one area which will be in contact solely with clearance surfaces of those twist drills receivable in the apparatus which have a larger diameter. The provision of said openings completely prevents the formation of a groove in the grinding surface and ensures a high grinding action of said interrupted area of the grinding surface.
REFERENCES:
patent: 2755601 (1956-07-01), Lux
patent: 4574529 (1986-03-01), Wurscher
Kelman Kurt
Rachuba Maurina
Schmidt Frederick R.
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