Twist drill for tough plastics

Details Twist drill for tough plastics Twist drill for tough plastics

1987-09-04

1988-12-06

Desmond, Eugene F.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

B23B 5102

Patent

active

047892765

ABSTRACT:
There is disclosed a twist drill particularly adapted for drilling plastics and composite materials having a sharp point angle, typically 85.degree. to 95.degree., and a very low lip relief angle, typically 2.degree. to 3.degree.; the relief surfaces are broad, though not unusually so, and may each subtend an angle of 40.degree. to 60.degree. about the drill longitudinal axis. A two-flute drill is shown, but the structure may be modified to provide three or more flutes. Land width, helix angle, and other attributes of the twist drill are generally similar to most common varieties of twist drills for steel, wood, or other uses in drill presses or hand drills.

REFERENCES:
patent: 2859645 (1958-11-01), Emmons et al.

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