IT1030140B - Method of forming a drill - involves forming two opposed depressions with flats forming a chisel tip - Google Patents

Method of forming a drill - involves forming two opposed depressions with flats forming a chisel tip

Info

Publication number
IT1030140B
IT1030140B IT6738275A IT6738275A IT1030140B IT 1030140 B IT1030140 B IT 1030140B IT 6738275 A IT6738275 A IT 6738275A IT 6738275 A IT6738275 A IT 6738275A IT 1030140 B IT1030140 B IT 1030140B
Authority
IT
Italy
Prior art keywords
forming
flats
depressions
chisel tip
drill
Prior art date
Application number
IT6738275A
Other languages
Italian (it)
Original Assignee
Gkn Screws Fasteners Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gkn Screws Fasteners Ltd filed Critical Gkn Screws Fasteners Ltd
Priority to IT6738275A priority Critical patent/IT1030140B/en
Application granted granted Critical
Publication of IT1030140B publication Critical patent/IT1030140B/en

Links

Abstract

The method involves using a cylindrical blank. Dies are used to form the cutting end of the blank (D) into two identical depressions (17b) equally spaced about a central axis. These depressions have opposing surfaces positioned opposite each other to give two wedge shapes. The outer edges (20) may also alter from curved to straight and at an angle to the central axis. The end of each depression is worked to form a flat (17), the flats being diametrically opposed and inclined at the same angle with respect to the blank axis. The flats form a chisel tip passing near the crossing point of the two depressions and angularly displaced with respect to the cutting edge (19) of each depression.
IT6738275A 1975-02-13 1975-02-13 Method of forming a drill - involves forming two opposed depressions with flats forming a chisel tip IT1030140B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
IT6738275A IT1030140B (en) 1975-02-13 1975-02-13 Method of forming a drill - involves forming two opposed depressions with flats forming a chisel tip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT6738275A IT1030140B (en) 1975-02-13 1975-02-13 Method of forming a drill - involves forming two opposed depressions with flats forming a chisel tip

Publications (1)

Publication Number Publication Date
IT1030140B true IT1030140B (en) 1979-03-30

Family

ID=11301922

Family Applications (1)

Application Number Title Priority Date Filing Date
IT6738275A IT1030140B (en) 1975-02-13 1975-02-13 Method of forming a drill - involves forming two opposed depressions with flats forming a chisel tip

Country Status (1)

Country Link
IT (1) IT1030140B (en)

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