JPS6412715U - - Google Patents

Info

Publication number
JPS6412715U
JPS6412715U JP10669287U JP10669287U JPS6412715U JP S6412715 U JPS6412715 U JP S6412715U JP 10669287 U JP10669287 U JP 10669287U JP 10669287 U JP10669287 U JP 10669287U JP S6412715 U JPS6412715 U JP S6412715U
Authority
JP
Japan
Prior art keywords
drill
tip
diameter
rear end
margin
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
Application number
JP10669287U
Other languages
English (en)
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 filed Critical
Priority to JP10669287U priority Critical patent/JPS6412715U/ja
Publication of JPS6412715U publication Critical patent/JPS6412715U/ja
Pending legal-status Critical Current

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Landscapes

  • Drilling Tools (AREA)

Description

【図面の簡単な説明】
第1図は、この考案に係るドリルの正面図、第
2図は同上の要部を拡大して示す正面図、第3図
は同上の平面図である。 1……ねじれ溝、2……刃部、3……ストレー
ト溝、4……先端部、5……マージン部、α……
リード角。

Claims (1)

    【実用新案登録請求の範囲】
  1. 刃部の先端部より後端部に向かつてねじれ溝の
    リード角を漸次小さく形成すると共に、ドリル外
    周部に前記先端部からドリル径の3〜5倍の長さ
    の範囲でマージンを形成し、かつ、上記範囲を越
    えて後端部に至るまでのドリル径を、先端切刃径
    より小さく形成して成るドリル。
JP10669287U 1987-07-09 1987-07-09 Pending JPS6412715U (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10669287U JPS6412715U (ja) 1987-07-09 1987-07-09

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10669287U JPS6412715U (ja) 1987-07-09 1987-07-09

Publications (1)

Publication Number Publication Date
JPS6412715U true JPS6412715U (ja) 1989-01-23

Family

ID=31340431

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10669287U Pending JPS6412715U (ja) 1987-07-09 1987-07-09

Country Status (1)

Country Link
JP (1) JPS6412715U (ja)

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