Ceramic bit for high speed drilling

Details Ceramic bit for high speed drilling Ceramic bit for high speed drilling

2008-05-06

2008-05-06

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

C408S144000, C408S0010BD

Reexamination Certificate

active

07367758

ABSTRACT:
A ceramic drill bit comprising a cylindrical shank and a shaped portion extending axially in line with the shank and having a free end forming the tip of the bit, a relief face extending from each main cutting edge with a relief angle lying in the range 4° to 10° approximately relative to a plane perpendicular to the axis of rotation of the bit, and two notches forming two secondary cutting faces extending from the central edge with positive cutting angles lying in the range 1° to 7° approximately relative to the axis of rotation of the bit.

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