Radially balanced rotary drill

Details Radially balanced rotary drill Radially balanced rotary drill

1977-11-16

1979-04-17

Hinson, Harrison L.

Cutting by use of rotating axially moving tool

Tool or tool with support

408204, 408226, 408703, 408705, 76101A, B23B 5100, B23B 4102, B23B 3144

Patent

active

041498216

ABSTRACT:
A rotary drill comprises a shank, two axially extending chip removal recesses, and at least two radially oriented cutting inserts. One insert is peripherally located and is arranged adjacent one of the chip removal recesses. The edge of the peripheral insert extends radially so as to form the wall of the hole to be drilled. Another insert is located radially inwardly of the peripheral insert and is arranged adjacent the other chip removal recess. The inserts extend axially to generally the same extent. The inner insert is offset from a 180 degree relationship with the peripheral insert by an angle, which angle is of such magnitude that the drill is radially balanced.

REFERENCES:
patent: 3014386 (1961-12-01), Kallio
patent: 3354528 (1967-11-01), Appleby
patent: 3540323 (1970-11-01), Rishel
patent: 3591306 (1971-07-01), Rieden
patent: 3767315 (1973-10-01), Burks
patent: 3963365 (1976-06-01), Shallenberger, Jr.
patent: 3966349 (1976-06-01), Osman

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