Drill hole for freeze proof sillcock

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  #1  
Old 07-11-16, 07:02 PM
Q
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Drill hole for freeze proof sillcock

I need to drill a 1.25" hole through 8" of concrete.
Can this be done with a hammer drill?
 
  #2  
Old 07-11-16, 07:19 PM
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We have no idea which drill you have so hard to say if it will work.
That's asking a lot of a light duty drill.
I'd be using my SDS drill.
 
  #3  
Old 07-11-16, 07:53 PM
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Qwerty, I have the same project on my list. I don't want to come out through the rim and my new siding so want to go through the concrete.

Now, the concerns I have are running into some rebar. I know they used some, but that was almost 40 years ago and i wasn't paying close attention. I'll cross my fingers on that one. Where I have a three 1/2" drills, none are hammer drills, so when time comes I will hit the rental shop for the proper drill and bit. I am a frequent flier at one of my local rental shops. They have quality equipment in good condition and always friendly advice.

Bud
 

Last edited by Bud9051; 07-11-16 at 07:55 PM. Reason: spelling
  #4  
Old 07-11-16, 08:31 PM
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So SDS will be fine? I don't own a hammer drill so will be renting. A core drill seems a bit excessive but won't the drill bit on a SDS get hot without water? What type drill bit is needed?
 
  #5  
Old 07-11-16, 09:04 PM
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Actually, instead of a hammer drill you might ask them about a small electric jack hammer. They would come with the bit and do a better job, at least faster.

Bud
 
  #6  
Old 07-11-16, 10:46 PM
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A core drill IS the proper bit. It will come with a small pilot bit, 3/16 or 1/4 inch.
 
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Old 07-12-16, 05:17 AM
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Core drill is about $100 a day. Seems a bit much just to make a hole. What drill bit will work on the hammer drill? Jack hammer won't make a clean round hole?!
 
  #8  
Old 07-12-16, 08:52 AM
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Drilling an 1-1/4 inch hole through eight inches of concrete without using a core drill will leave a rather sloppy hole. You could use a twelve inch long 1/4 inch bit and make several holes and then break out the rest with a punch and chisel. Using a solid bit will take forever unless you have a really powerful (read large and heavy) drill motor. You could use a series of solid bits from 1/4 inch on up and do it a bit easier and quicker than using just the finished size.

No matter how you do it, it will take a fair amount of time going through that much concrete. That is why I recommend a core drill, a clean hole in a reasonable amount of time with a relatively easy-to-use drill motor.
 
 

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