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Thread: Please - How Can I ( 64000 dollar Question )

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    Cool Please - How Can I ( 64000 dollar Question )

    How can I take a 1 inch dia concrete drill bit and drill down 100' using a standard 1/2 electric drill..
    I need to get through this limestone substrate.

  2. #2
    DIY Member bcpumpguy's Avatar
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    Are you looking for a stupid answer?

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    General Engineering Contractor ballvalve's Avatar
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    Your drill must be bored for a high pressure water feed, the tip must be quite larger than the shank, and you need a monster hammer drill. Or rent one of those home well drilling rigs.

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    Test, Don't Guess! cacher_chick's Avatar
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    Most anything you might use as an extension at that length would not drill in a straight line, nor would such a hammer drill apply the force adequately.

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    Just kicking around the idea.. All input is welcome.
    Here is where I'm at: REBAR for the shaft.. Maybe weld a carbide bit to the rebar and drill at 12' sections? Weld sticks together as needed - making length as you drill deeper and deeper.

    Poking holes in my ideas is always welcome.

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    DIYer, not in the trades LLigetfa's Avatar
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    Quote Originally Posted by Mike Pastorelli View Post
    Poking holes in my ideas is always welcome.
    OK, here goes...

    REBAR is solid. You need something that is hollow to run air/water/slurry down. The water is required to carry up the drill cuttings. Drill rigs usually mix up a slurry that is much heavier than water and so will float the cuttings which are relatively lighter in the heavy slurry.

    12 foot sections would require that you have staging 12 feet high either movable or with multiple levels to stand on.

    Unless the bedrock is exposed, you first need to drill through the overburden and case it out. You also need to seal the casing into the bedrock.

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    DIYer, not in the trades LLigetfa's Avatar
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    Quote Originally Posted by bcpumpguy View Post
    Are you looking for a stupid answer?
    Good thing I drank all my coffee or it would be all over my computer screen. Mike has put forth a few hair-brained ideas before and this is one of them.

    The mass of a drill bit 100 feet long is more than any 1/2 inch hand drill could drive. I used to work on big drill rigs and know what sort of power it takes. Also, it takes a lot to lift out 100 feet of drill steel.

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