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 tipInfo
- 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
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.
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) |
-
1975
- 1975-02-13 IT IT6738275A patent/IT1030140B/en active
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