Double diameter boring tool

Cutting by use of rotating axially moving tool – Processes – Bit detachable

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Details

408147, 408224, 408713, B23B 5100

Patent

active

047937459

ABSTRACT:
A boring tool and a method of operation are provided for boring two concentric holes of precision diameters and depths in a single operation. The boring tool includes an elongated tool body, a shank for attachment to a standard adjustable boring head which is used on a manual or numerical control milling machine and first and second diametrically opposed cutting edges formed for cutting in opposite directions. The diameter of the elongated tool body is substantially equal to the distance from the first cutting edge tip to the axis of rotation plus the distance from the second cutting edge tip to the axis of rotation. The axis of rotation of the tool is spaced from the tool centerline a distance substantially equal to one-half the distance from the second cutting edge tip to the axis of rotation minus one-half the distance from the first cutting edge tip to the axis of rotation. The method includes the step of inserting the boring tool into the boring head, adjusting the distance between the tool centerline and the tool axis of rotation as described above and boring the two concentric holes.

REFERENCES:
patent: 1418485 (1922-06-01), Smith
patent: 3241404 (1966-03-01), Sirola
patent: 4034452 (1977-07-01), Edming
patent: 4176990 (1979-12-01), Gover, Sr.
patent: 4243348 (1981-01-01), Paige
patent: 4411563 (1983-10-01), Moon

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