Twist drill bit

Details Twist drill bit Twist drill bit

1997-04-03

1999-08-03

Pitts, Andrea L.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408229, B23B 5100

Patent

active

059316152

ABSTRACT:
A drill is provided with a pair of spiral cutting blades having opposed cutting edges to come together at an angle to form a starting tip. Each of the spiral cutting blades includes a primary and a secondary flute which extends longitudinally thereof and is provided with cutting edge segments thereon, one flute being provided with an outer cutting edge segment and a second flute being provided with an inner cutting edge segment. The outer cutting edge segments of each cutting blade are in axial alignment with each other and the center point of the drill bit and perpendicular to an arcuate segment of the outer periphery of the drill.

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