Drill bit with pilot point

Details Drill bit with pilot point Drill bit with pilot point

2005-02-22

2005-02-22

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

C408S225000, C408S230000

Reexamination Certificate

active

06857832

ABSTRACT:
A drill bit for the working of metal has a center pilot tip that transforms into straight cutting edges extending towards the outer periphery of the bit. Each cutting edge forms a cutting angle of 1-20° with a reference plane oriented perpendicular to of the drill axis. Each a cutting edge is inclined in a radially inward and axially rearward direction toward the drill axis. The center tip forms a pilot point angle of 90±2° and a has base that takes up 23-45 percent of the total diameter of the cutting section of the drill bit. The tip has a tip angle of 90±10°.

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English Abstract of German 3123048.

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