Twist drills

Details Twist drills Twist drills

1997-03-25

2000-10-17

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408229, B23B 5102

Patent

active

061321494

ABSTRACT:
A helical twist drill has fluted lands each having projecting from their radially outer faces a plurality of circumferentially spaced support margins. At least one of the support margins is asymmetrically spaced with respect to the other support margins.

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Patent Abstracts/Japan vol. 96, No. 010: JP 08 155 713 (Toshiba Tungaloy Co. Ltd.).

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