Twist Drill Parts (Drill Part 4)

Hello Dosto Kaise Ho Aap Pichale Article Me mene Apko Twist Drill Ke Kuch Bhago Me Bataya Tha Es Article Me Apko Aur Bhago Ke Bare Me Bataya Tha.. Pichhale Article ko Padne Ke Liye Aap Link Me Ja Kar Pad Sakte Hain.. Drill Part 3
To Dosto Suru Karte Hain Es Article ko..

3)Neck:-
         Yah Bhag Bi Kewal Taper Shank Drill Me Hota Hai Yah Shank Or Bodi Ke Bhech Ka Plen Silidrkl Bhag Hota Hai Jis Par Drill Ka Size Likha Hota Hai Aur Drill Ka Material Likha Hota Hai.
4)Body
        Drill ke jis bhag me flute kate hote hai use body kahate hai. Drill ki body me Ninmlikhit bhag hote hain:-
1)Flute
2)Margin
3)Lang
4)Body clearance & Web Etc..
5)Flutes
          Drill ki body me jo Ghumawdar Sprial Groove kate hote hain Unhe flute kahate hai n flutes ke Nimnlikhet karya Hote Hain:-
1)Yah Cutting Edge banate hai Matalb drill me jitne Flute hoge utne hi Cutting edge banenge.
2)Eske dwra chips bhahr aasani se niklte hai
3)Enki shayata se coolentt prawaha Point tk phuchta hai.

6)Land
         Do flute ke bech me pure lambayi me jo bhag hote hai use land kahate hain.


7)Margin:- Land ke upar jo chamkeli rekha hoti hai use margin kahate hai drill ka Dia margin se mapa jata hai dilig krte samy yah bhag satah ko chhuta rahta hai. Margin ki chodayi 1 ya 2 mm.  tk rakhi jate hai.

8)Body Clearance:-

                           Land pr Margin ko chhod kr Baaki bhag ko body clearance kahte hain. yah bhag drilling krte samy Hole ki satah ke sath Esparss nhi krta hai Jisse Gharsad kam hota hai.Aur drilling krne me Aasani rhte hai. yah drill ke vyas(Dia) se km Size ka hota hai Ese clearance Dia bhi kahte hain.


9.  Point :- Drill Ka Wah Bhag Jaha Dono Conical Satah Aapas Me Aakar Milte Hain Use Point Ya Dead Centre Ya Chisel Edge Kahte Hain.
Eske Nimnn Bhag Hain:-

1. Point Angel
2. Cutting Edge
3. Heel
4. Chisel Edge Angle

10. Point Angle :-Drill Ke Point Ki Conical Surface Aaps Me Jis Angle Par Grind Hoti Hai Use Point Angle Kahte Hain Ese Cutting Angle BBh Kahte Hai Yah Dhatuo(धातुओं) Ke Anusar Alag Alag Hota Hai. Cutting Angle Hard Metal Ke Liye Adhik Or Soft Metals Ke Liye Kam Rakha Jata Hai Yah Nimlikht Anusar Rakha Jata Hai Yah Aam Sadaharan Dhatuo Ke Liye 118°Rakha Jata Hai,Lekin Dusre Dhatuo Ke Liy 80°Se 140°Tak Rakha Jata Hai.

Cutting Angle

Cutting Angles

11.  Cutting Edge:- Drill Ke Cutting Edge Ko Leep Bhi Kahte Hain, Drill Me Yadi Do Flutes Ho To Do Cutting Edge Bnte Hain Drill Ka Cutting Edge mtlb Cutting Krne Wala Wah Kirana Hota Hai Jaha Se Marjin Line Suru Hoti Hai.Drill Ke Cutting Edge Ki Lambayi Aur  Angle Barabr Honi Chahiye Drill ka Lip Angle     Normally  59°Ka Hota Hai.

12.  Lip Clearance:-Lip Clearance point ki Wah Satah Hoti Hai Jo Cutting Edge ke  Niche Ki Taraf Grind Hoti Hai.Twist Drill ka Lip Clearance Angle 8°Se 25°Tak Hota hai.Yah Narm Dhatuo Ke Liye Adhek Or Kathor Dhatuo ke Liye kam Rakha Jata Hai Kyuki Jitna Angle Adhik Hoga To Drill Cutting Adhik Krega Lekin Cutting Edge Kamjor Hoga Esliye K athor Dhatuo ke Liye Lip Clearance Angle Hard Dhatuo Ke Liye kam Rakha Jata Hai, Jo sharp Kam Hota hai Leking Jyada Majbut  व  Tikaw hota Hai. Yadi Drill me Lip Clearance angle nhi Rakha Ho To Drill Cutting Nhi Krta Hai or Garm Hokr Khrab Ho Jata Hai Aur Aawj bi Krta Hai Ese Clearance Angle bi Kahte Hain.

Lip Clearance Angle

Dhatu ka Nam.            Lip Clearance Chod
1.MS                                  12°se 15°Tak
2.Petal                               12°tak
3.Aluminium                   12°Se15°Tak
4.Cast Iron                        8°Se12°Tak
5.Hard Steel.                    8°Se10°Tak


13 . Heel:- Cutting Edge Se Thik Piche Ke Point Ke Bhag Ko Heel Kahte Hain Yah Cutting Karte Samy Job Ki Satah Ko Nhi Chhuta Hai.

14. Web:-Drill Ki Dhuri par Dono Flutes ke Bich me Jo Dhatu Bachti Hai Use Web Kahte Hain. Yah Point Se Shank ki Taraf Moti Hoti Hai.

15.  Chisel Edge Angle:-  Cutting Lip Or Chisel Edge ke Madhy jo Angle Hota Hai Use Chisel Edge Angle kahate Hain. Yah 120°Se 135°Hota Hai Ese Web Angel Bi Kahte Hain.

Drill Chesel Edge 

16.Helix Angle:- Ese Flutes Angle Ya Rake Angle Bi Kahte Hain Drill ki Dhuri ke Sath Flutes Jis Angle Par Bane Hote Hain. Use Helix Angle KhKah Hai Yah Angle Flutes ki Lead se Sambndh Rakhta Hai Ese H,N or S Teen Type me Banaya Jata Hai,H Type Helix Angle Hard Metal Ke Liye ,N Type Narml Dhatuo Ke Liye or S Type Soft Metal Ke Liye Hota Hai. Aamtor Par Helix Angle Ya Rake Angel   27.5°     Hota Hai Ya Drill Ke Dia Ke Anusar bi Alag Alag Hota Hai BIS ke Anusar yah Nimlikht Hai

   H Type Drill KA Helix Angle 10°se 13°
    N Type Drill ka Helix Angle 18°se30°
    S Type Drill Ka Helix Angle 35°se 40°

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