Spiral drill bit and method of forming same

Details Spiral drill bit and method of forming same Spiral drill bit and method of forming same

Filed on

2008-01-04

Date issued

2011-10-04

Examiner

Howell, Daniel (Department: 3726)

Patent Class

Cutting by use of rotating axially moving tool

SubClass

Tool or tool with support

SubSubClass

Having stepped cutting edges

Other Related Categories

C076S108600

Type

Reexamination Certificate

Status

active

Patent number

08029215

Description

ABSTRACT:
A spiral drill bit for forming holes of a variety of sizes has a main body which provides first and second helical grooves. First and second flutes extend along the length of the main body to provide first and second helical groove segments. Cutting segments are provided between the helical groove segments. The method for forming the spiral drill bit includes turning the helical groove segments onto a round stock. An axial clearance and an initial diametral clearance are provided upon turning the helical grooves. A grinding process is used to form a radial clearance and a final diametral clearance. The reduction to the amount of grinding required to form the spiral drill bit results in a reduction to the cost of production and a reduction in the time necessary to produce the spiral drill bit.

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