JPS56126510A - Twist drill for deep hole - Google Patents
Twist drill for deep holeInfo
- Publication number
- JPS56126510A JPS56126510A JP2413580A JP2413580A JPS56126510A JP S56126510 A JPS56126510 A JP S56126510A JP 2413580 A JP2413580 A JP 2413580A JP 2413580 A JP2413580 A JP 2413580A JP S56126510 A JPS56126510 A JP S56126510A
- Authority
- JP
- Japan
- Prior art keywords
- drill
- recesses
- hole
- cutting edge
- deep hole
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Landscapes
- Drilling Tools (AREA)
Abstract
PURPOSE: To improve the centering property of a drill and to prevent the hole from curving, for making a deep small hole in a hard-to-cut material such as stainless steel, by providing recesses of prescribed width on the tip surfaces of the cutting edge of a drill.
CONSTITUTION: Recesses 12, 12a are provided on the tip surfaces 11 of the cutting edge of a twist drill 10 for drilling a deep hole so that the recesses 12, 12a are asymmetrically located on concentric circles. The width of the recesses 12, 12a is one fourth to one eighth of the length of the cutting edge, and the diameter of the drill is not more than 1.0mm. The drill 10 is shaped so that its twist angle is continuously varied from the tip to the root. Since the recesses 12, 12a of prescribed width are provided, the area of contact of the drill 10 with a hard-to-cut material such as stainless steel is reduced to improve the centering property of the drill 10 to prevent the hole from curving.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2413580A JPS56126510A (en) | 1980-02-29 | 1980-02-29 | Twist drill for deep hole |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2413580A JPS56126510A (en) | 1980-02-29 | 1980-02-29 | Twist drill for deep hole |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56126510A true JPS56126510A (en) | 1981-10-03 |
Family
ID=12129866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2413580A Pending JPS56126510A (en) | 1980-02-29 | 1980-02-29 | Twist drill for deep hole |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56126510A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102389991A (en) * | 2011-12-06 | 2012-03-28 | 株洲钻石切削刀具股份有限公司 | Double-margin twist drill |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS478932U (en) * | 1971-02-23 | 1972-10-03 | ||
JPS49103290A (en) * | 1973-02-05 | 1974-09-30 |
-
1980
- 1980-02-29 JP JP2413580A patent/JPS56126510A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS478932U (en) * | 1971-02-23 | 1972-10-03 | ||
JPS49103290A (en) * | 1973-02-05 | 1974-09-30 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102389991A (en) * | 2011-12-06 | 2012-03-28 | 株洲钻石切削刀具股份有限公司 | Double-margin twist drill |
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