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  1. #1
    Join Date
    Jul 2008
    Posts
    46

    Default Why is it necessary to withdraw the bit from the hole as you drill thru concrete

    i'm just curious why periodically you have withdraw the bit from the hole as you drill thru concrete to remove loose dust and debris---what would happen if you didn't.

  2. #2
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    5,081

    Default Re: Why is it necessary to withdraw the bit from the hole as you drill thru concrete

    If you don't, you'll have excessive heat built up and your drill bit will go dull fast.

  3. #3
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,557

    Default Re: Why is it necessary to withdraw the bit from the hole as you drill thru concrete

    Eventually you would have so much debis in the hole that it would bind the bit.

    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  4. #4
    Join Date
    Aug 2007
    Posts
    6,480

    Default Re: Why is it necessary to withdraw the bit from the hole as you drill thru concrete

    Ditto what they said.

    Regardless of the drill bit type and what you're drilling, the debris fills the flutes and won't eject on its own, especially from deeper holes. By pulling the bit out of the hole, you clear this debris, allowing the flutes to stay clear and pull the debris away from the tip, reducing heat, and preventing binding of the bit in the hole.

    In the case of drilling concrete, it doesn't hurt to have a shop vac handy to suck the holes clean periodically too, again, clearing the debris helps the bit to cut better and last longer.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  5. #5
    Join Date
    Jan 2010
    Location
    Northern Virginia
    Posts
    975

    Default Re: Why is it necessary to withdraw the bit from the hole as you drill thru concrete

    We use an air gun (with a compressor) to blow out holes in masonry when we are epoxying in anchor bolts,which needs a fairly clean hole. Even the blast of 120 psi air don't get the hole sanitary-clean, but it helps just enough so the epox. does its thang.
    Casey
    Remove not the ancient landmark, which your fathers have set.

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