Drilling thru 10 inch concrete foundation

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Old 06-15-07, 10:18 PM
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Drilling thru 10 inch concrete foundation

I have to run a cable thru a 10 inch 3500 PSI concrete foundation wall, it contains no rebar. Whats the best bit to use.
Thanks
Gregory
 
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Old 06-15-07, 11:26 PM
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A 12" inch one.
 
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Old 06-16-07, 04:23 AM
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Tscarborough, I almost shot coffee out my nose on that one!
The better question would be what drill (and bit) to use. Rent a Hilti roto-hammer from a local rental yard and tell them what you're doing. They'll set you up to finish the job in 5 minutes. You're looking for a large spline drive or SDS hammer drill with appropriate sized bit to go all the way through the wall in one shot. Good luck!
Tscarborough, I'll be watching for you on Letterman.

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Old 06-16-07, 01:55 PM
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I have a DeWalt D25600K 11.5 amp hammer drill to do the drilling, I need to know what type of bit would be easiest.
Thank
Gregory
 
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Old 06-16-07, 02:45 PM
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something like one of these of the appropriate size:

http://www.dewalt.com/us/products/accessory_category_detail.asp?categoryID=4085

they are available as two cutter blade:

http://www.dewalt.com/us/products/accessory_category_detail.asp?categoryID=4084

and a less expensive but I prefer the four because of you happen to have to cut into or through another hole, it tends to grab less.
 
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Old 06-17-07, 05:45 AM
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Greg,
is that DeWalt drill an SDS II or spline drive? Or is it a drill with a chuck you have to tighten around the bit? Believe me, if you rented the other drill and bit, you could drill through in less than 5 minutes and maybe even save money. I don't know how much they would rent for, but if they have a 4 hour rate it wouldn't be too bad. I also don't know how much you'd pay for a new 12 inch bit (or 2, if one gets damaged) for your drill. It may be a wash.
The types I mentioned are MUCH faster and heavier duty than a typical hammer drill. If you were drilling vertically, you would not even have to add pressure, the drill bit would eat through on its own. Good luck.

Pecos
 
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Old 06-17-07, 06:25 AM
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Gregory,

I agree that using a larger drill that has an SDS style bit would save you a lot of grief and may rent for the cost of buying a bit.
If you do purchase a bit for your chuck type drill then a masonary bit in whatever diameter you wish to drill the hole.

A couple of tips are if you want to do a professional job then you can drill the hole oversized and then insert a sleeve to protect the cable.
A piece of plastic or metal conduit would work.
Also, even if you have no future plans for anything, making the hole larger for future use may be handy.
If you think you might have a future need for data and power two holes are better to keep them separated.
 
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Old 06-17-07, 07:59 AM
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hey guys, this is the drill he already has:

http://www.dewalt.com/us/products/tool_detail.asp?productID=5872

it is an SDS capable of 1 3/4" holes in concrete. He already has a good drill, all he needs is a bit.
 
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