Drilling boulder

Discussion in 'Hardscaping' started by jbailey52, May 9, 2007.

  1. jbailey52

    jbailey52 LawnSite Bronze Member
    Posts: 1,089

    Hi, I am looking to drill a 3/4 inch hole in a boulder approx 30" x 34"... this will be a bubbler boulder for a fountain.. many people said I would spend hundreds on several diamond bits, others said just rent a hammer drill and use the bits they give you, starting with small and working up... is it possible?
     
  2. Greybeard

    Greybeard LawnSite Member
    Posts: 132

    I'd vote for the second method, and test it on a smaller rock first. We've drilled a lot of concrete, but not stone, so please post your results. If you're going to be doing this regularly, I'd recommend the Bosch 11224VSR tool - about $200 at the Home Cheapo, and it be used as a chipping hammer or drill, too. We've got 3 of them, and they work better and longer than some of the bigger ones. Good luck.
     
  3. jbailey52

    jbailey52 LawnSite Bronze Member
    Posts: 1,089

    as of right now this is a one time thing.. I just want to know how it is done.. I mean we have all seen the big boulders that are drilled.. so obviously its not impossible... anyone else have suggestions?
     
  4. ChampionLS

    ChampionLS LawnSite Bronze Member
    Posts: 1,066

    for a small 3/4 hole, you can use any hand held hammer drill and a 3/4 hammer drill bit. No big deal there. Whatever you do, don't start out with a small bit and try to work up to 3/4. It's not wood. Stone will not cut or chip away as easily.
     
  5. jbailey52

    jbailey52 LawnSite Bronze Member
    Posts: 1,089

    my question is the boulder will be 2.5 - 3' deep.. are bits that long? Do i need to buy one or can I rent a 3' bit?
     
  6. sheshovel

    sheshovel LawnSite Fanatic
    Posts: 5,112

    Nope, don't make them that long that I know of. Question, what kind of boulder is it... granite? Hardness varies with different types of rock.
    Most big boulders used for fountains are drilled towards the top of the boulder then across and out. So you don't have to drill all the way through to the top.
    Or the water tube is actually outside the boulder and lays over the top held down by stones and hidden from the back.
     
  7. sheshovel

    sheshovel LawnSite Fanatic
    Posts: 5,112

    Here are two ways to go about it.
     

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  8. jbailey52

    jbailey52 LawnSite Bronze Member
    Posts: 1,089

    my question is the boulder will be 2.5 - 3' deep.. are bits that long? Do i need to buy one or can I rent a 3' bit?

    this is basically it.. but the boulder will be bigger and smoother (they are big river boulders)

    [​IMG]
     
  9. Plant Buyer 83

    Plant Buyer 83 LawnSite Member
    Posts: 176

  10. Dirty Water

    Dirty Water LawnSite Fanatic
    Posts: 6,799

    One contractor I know found a rock in the pit that already had been drilled (Probably for blasting), You could call your gravel pits and see if they already have some sitting around.
     

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