Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Patent
1978-11-17
1980-09-16
Bilinsky, Z. R.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
407 54, 408144, B23B 5102
Patent
active
042226902
ABSTRACT:
A drill comprising a pair of cutting edges extending from the center of rotation of the drill symmetrically with respect to the center and curved outwardly away from the direction of rotation of the drill with a greater curvature in the center portion than in the outer peripheral portion of the drill when seen in a bottom view. The cutting edge is formed, close to its starting end, with a rake face having a rake angle approximately to zero to enable the starting end portion of the edge to cut a workpiece with greater ease.
REFERENCES:
patent: 2778252 (1957-01-01), Oxford, Jr.
patent: 3680262 (1972-08-01), Aydelott et al.
patent: 4123186 (1978-10-01), Hoadley
patent: 4132493 (1979-01-01), Hosoi
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