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What type of Rotary Hammer Drill is best for drilling into a poured foundation?

I need to drill a series of holes in a poured concrete foundation to allow for a 6" vent to be installed. I would like to drill a series of holes in a circle, then multiple holes in the middle to make it easier to chissel out. Any recommendations on types / models of rotary hammer drills?

Asked By: kurtwalden - 3/12/2007
Best Answer - Chosen by Asker
Can't agree with the air hammer for a vent hole. That's what I'd use if I wasn't concerned with a neat opening and wanted a rough hole fast. The core drill does give the neatest hole, but cost more to rent, and is too expensive to buy for a one time job. It is fast though, and would be my first choice... More
Answered By: Steve C - 3/12/2007
Additional Answers (6)
The better way to make a 6 inch hole in a concrete wall is to use an air hammer driven by an air compressor. Not a series of holes as you will hit large pieces of crushed rock which are very very hard and you will eventually give up on that idea... More
Answered By: James M - 3/12/2007
 
Hilti is one of the leaders in hammer drills and you will pay a pretty price for one. They can be rented
Answered By: aussie - 3/12/2007
 
hilty is the way to go. if it were me i'd see about renting a diamond core drill, much neater hole...
Answered By: Bricky Local 9 PA - 3/12/2007
 
Best way Is to core Drill You can Rent it with A Bit Big Enough for 6" Pipe.
Answered By: bob r - 3/12/2007
 
Best way to do this is to rent a concrete coring machine. This will ensure a perfect circle. Otherwise your circle will be uneven and you risk starting cracks in the slab that will be a problem down the road. (assuming the concrete is at least 4" thick... More
Answered By: Guy W - 3/12/2007
 
Hilti are probably the best, but there are plenty of others. Hitachi, Makita, Ramset, Dyna.etc If hireing, the Hire company will have quality equipment. If you are going to buy get a quility brand that can be used as both a rotary drill, or as an impact drill. Just watch out for re-bar
Answered By: Murray H - 3/12/2007
 
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