Drill for drilling a thin plate

Details Drill for drilling a thin plate Drill for drilling a thin plate

1989-01-18

1989-11-07

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408199, B23B 5102

Patent

active

048787884

ABSTRACT:
Disclosed is a drill for drilling thin plates and which has a pair of major cutting edges each including an inner major cutting edge diagonally extending in an inner portion of the tip so as to form a protrusive leading part, and an outer major cutting edge radially extending in the tip, a chisel edge formed at the junction of the inner major cutting edges, and continuous flanks formed behind the inner major edges and the outer major cutting edges, respectively. The diameter of the leading part formed by the inner major cutting edges is in the range of 40 to 50% of the drill diameter, the point angle formed between the inner major cutting edges is in the range of 100.degree. to 115.degree., the outer corner angle formed between the outer major cutting edge and a plane perpendicular to the axis of the drill is in the range of 4.degree. to 10.degree., and no margin is formed in the circumference of the tip.

REFERENCES:
patent: 3237488 (1966-03-01), Parone et al.

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