Gear cutting – milling – or planing – Milling – Thread or helix generating
Patent
1979-05-07
1981-07-14
Bray, W. D.
Gear cutting, milling, or planing
Milling
Thread or helix generating
10101R, 409 77, B23C 328
Patent
active
042783747
ABSTRACT:
In combination with a lathe holding and slowly revolving, about its longitudinal axis, a work-piece to be screw-threaded with a tapering portion and a cylindrical portion, a tool holder ring is eccentrically mounted about the work-piece and is rapidly rotated about the work-piece in the same direction as the work-piece but at a relatively higher speed; while rotating, the tool holder ring is caused to advance longitudinally along the revolving work-piece; a plurality of cutting elements, radially secured in the holder, have cutting edges that intermittently and successively contact tangentially the work-piece during each revolution so as to move from the work-piece a chip with each revolution; the cutting elements are disposed in a series of planes and the number of planes is equal to the length of the tapering section divided by a pitch of the thread plus one, the depth of the thread being accomplished by the continuous chipping of subsequent cutting elements set on adjacent planes of the tool holder ring.
REFERENCES:
patent: 2691921 (1954-10-01), Burgsmuller
patent: 2749807 (1956-06-01), Burgsmuller
patent: 2749808 (1956-06-01), Burgsmuller
patent: 2877536 (1959-03-01), Tronosmith
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