Abrasive drill

Details Abrasive drill Abrasive drill

1978-05-23

1980-05-20

Smith, Gary L.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51206NF, 51309, B24D 1700

Patent

active

042032628

ABSTRACT:
An abrasive drill of small diameter or "micro" drill, on the order of tenths of a millimeter to about a millimeter in diameter, is provided with a concentric cored portion occupied by relatively non-abrasive material. The filled portion is small enough that during drill rotation all of the surface of a workpiece within the outline of the end of the drill is abraded sufficiently by some part of the rotating end of the drill to crumble away rather than leaving any solid core or large fragments of the workpiece. The drill composition comprises abrasive particles in a less abrasive metallic matrix. The drill is formed by deposition of matrix material entraining abrasive particles onto a taut filamentary mandrel. The mandrel may be metallic, such as copper wire or may be non-metallic, such as nylon or other synthetic polymeric textile fiber composition.

REFERENCES:
patent: 2730439 (1956-01-01), Houchins
patent: 2772524 (1956-12-01), Kopczynski
patent: 3295941 (1967-01-01), Spellman
patent: 3547608 (1970-12-01), Kitazawa
patent: 3626644 (1971-12-01), Culper
patent: 3640027 (1972-02-01), Weiss
patent: 3762895 (1973-10-01), Keeleric
patent: 3854898 (1974-12-01), Whitney
patent: 4128971 (1978-12-01), Dunnington

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