Can enybody tell me why?

Discussion in 'Clock Repair' started by Tom Kloss, May 21, 2019.

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  1. Tom Kloss

    Tom Kloss Registered User
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    Dec 5, 2003
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    This a #20 drill bit I picked up at an auction.

    Can anybody tell me why they would do this to a drill bit?

    Tom

    Drill bit.jpg
     
  2. TEACLOCKS

    TEACLOCKS Registered User
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    Mar 22, 2005
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    Maybe so it would shear off at the thin point rather deep in the hole they were drilling.
     
  3. R&A

    R&A Registered User

    Oct 21, 2008
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    It's so the shank doesn't rub on the ID of the hole when the chips build up,when drilling past the flutes. The flutes aren't long enough for the chips to clear.
     
  4. Uhralt

    Uhralt Registered User
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    Sounds reasonable. But wouldn't a more shallow cut be sufficient for that purpose? It would leave the drill stronger.

    Uhralt
     
  5. Willie X

    Willie X Registered User

    Feb 9, 2008
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    Well,
    The flutes are there to remove the chips. So, I cant see where removing the flutes would help with chip removal.
    Maybe it was some odd clearance issue, where the bit couldn't be brought into position without the flutes digging into something:???: Willie X
     
  6. David S

    David S Registered User
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    The only thing I can think of is that the reduced shank will clear the chips much better if one is drilling a deep hole and due to limit of the tailstock feed screw, can't back the bit all the way out without unlocking the tail stock.

    I know a stretch.

    David
     
  7. shutterbug

    shutterbug Moderator
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    Oct 19, 2005
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    I can't even imagine HOW he did that, let alone why. Maybe he had some special project that 'required' him to hold on to the bit while it was turning.
     
  8. bchaps

    bchaps Registered User

    Dec 16, 2001
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    But Tom...the real question is why did you buy it.... or when you said you "picked it up"...:???: Bill.
    Call me when you can chat..570.983.5352
     
  9. R. Croswell

    R. Croswell Registered User

    Apr 4, 2006
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    That's what I think also.

    RC
     
  10. bangster

    bangster Moderator
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    To make it pretty.
     
  11. R. Croswell

    R. Croswell Registered User

    Apr 4, 2006
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    .161 - .080 - .161 well if you are a drill bit, I guess that's pretty you know...... not sure we can use the "s--ey" word here.
     

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