Stepped drill construction

Details Stepped drill construction Stepped drill construction

1984-08-09

1986-04-15

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

B23B 5102

Patent

active

045824584

ABSTRACT:
Drill bit for drilling holes of different diameters which has a series of cylindrical outer surfaces of increasing diameter from the outer to the inner end of the drill bit. A beveled conical surface interconnects each adjacent pair of cylindrical surfaces. At least two flutes are machined at two circumferentially spaced locations to provide two cutting edges on each diameter of the drill. At each cutting edge the cylindrical surfaces are relieved radially and the conical surface is relieved axially over an acute circumferential angle. The major peripheral portions of the cylindrical and conical surfaces for each diameter are respectively concentric to the axis of the drill and of zero pitch angle.

REFERENCES:
patent: 2276532 (1942-03-01), Welty
patent: 2786373 (1957-03-01), Patton
patent: 2897696 (1959-08-01), Fisserant
patent: 3076356 (1963-02-01), Simich
patent: 3564945 (1971-02-01), Bradley
patent: 3758222 (1973-09-01), Oakes
patent: 4090807 (1978-05-01), Stewart

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