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Drilling boulder

jbailey52

LawnSite Bronze Member
Location
Horticulture
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?
 

Greybeard

LawnSite Member
Location
Western MA
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.
 
OP
jbailey52

jbailey52

LawnSite Bronze Member
Location
Horticulture
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?
 

ChampionLS

LawnSite Bronze Member
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.
 
OP
jbailey52

jbailey52

LawnSite Bronze Member
Location
Horticulture
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?
 

sheshovel

LawnSite Fanatic
Location
zone 7 CA
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.
 
OP
jbailey52

jbailey52

LawnSite Bronze Member
Location
Horticulture
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)

 

Dirty Water

LawnSite Fanatic
Location
Redmond, WA
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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