Cutting by use of rotating axially moving tool – Tool or tool with support – Having axial – core-receiving central portion
Patent
1989-03-20
1990-08-28
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having axial, core-receiving central portion
408206, B23B 5104
Patent
active
049521020
ABSTRACT:
An annular hole cutter wherein each tooth is formed with a radially outer cutting edge and at least alternate teeth are formed with radially extending, circumferentially staggered inner and outer cutting edges. The bottom face of each tooth is formed with oppositely radially inclined inner and outer back-off faces which intersect in a downwardly extending crest which in turn intersects the radially outer cutting edge. The outer back-off faces of alternate teeth are vertically relieved relative to the outer back-off faces of the intermediate teeth and the inner back-off faces of the intermediate teeth are vertically relieved relative to the inner back-off faces of the alternate teeth a distance greater than the chip load at which the cutter is operated. In the preferred form, the radially inner portion only of the unrelieved inner back-off face is relieved to a greater extent than the relieved inner back-off faces.
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Advertisement by Ohmi Kogyo Co., Ltd. of Boring Cutter and Metal Cutting Nibbler for Electric Drills (5/2/81).
News Article: Low-Output Borer Plate to Bore a Deep Hole, Ohmi Kogyo Co., Ltd. (4/14/81).
News Article: Well-Reputed Boring Cutter, Ohmi Kogyo Co., Ltd. (7/15/81).
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