Metal tools and implements – making – Machines – Drill-forming or sharpening
Patent
1992-05-11
1993-04-13
Parker, Roscoe V.
Metal tools and implements, making
Machines
Drill-forming or sharpening
761082, 29898042, 408 1R, 82 111, 82142, 51288, B21K 502
Patent
active
052017958
ABSTRACT:
Method and apparatus for forming a base defining a trunnion and a portion of a leg for a roller-cone-type rock bit. A workpiece is rough formed to comprise leg work, having a preliminary end surface, and trunnion work extending angularly from the leg work. An interface plate is mounted on a holder of a lathe with an indexing surface thereof facing generally radially inwardly but angled to correspond to a desired angular orientation of a trunnion in a finished bit. The workpiece is removably mounted on the interface plate, with the preliminary end surface abutting the indexing surface, by at least one pin-type connector projecting from one of the surfaces into the other. The trunnion work is then turned on the lathe. Other parts of the machining of the workpiece may be performed by removing the workpiece from the first interface plate and similarly mounting it on plates adapted for other machines, but otherwise similar to the first plate. The workpiece can subsequently be returned to the first interface plate for fine turning of the trunnion. Also, the various interface plates can be exchanged for other plates providing differently oriented indexing surfaces to machine parts for other bits of other sizes or designs. A relatively small part of the leg work is ultimately removed before incorporating the base in a bit.
REFERENCES:
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patent: 4187743 (1980-02-01), Thomas
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patent: 4982496 (1991-01-01), Gaither et al.
Supfina, Operating Instructions for SE30 Superfinishing Attachments, Models 110 and 120.
"Using Your New Superfinishing Attachment," Supfina Machine Co., Inc.
Howard Danny B.
Palmo Daura
Cummins Tool Company
Parker Roscoe V.
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