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diy001 02-19-2011 10:42 AM

drill 2.5" hole through 10" concrete hole
 
I want to drill a 2.5" hole through a 10" internal concrete wall for my 2" washer drain.

I did some research. I think I need this core drill bit: SDS Carbide Masonry/Concrete Core Drill Bit 2.5" x 6".

Can I use this Bosch 11255VSR BULLDOG Xtreme 1-Inch SDS-plus D-Handle Rotary Hammer with this SDS-Plus Shank for Carbide Tipped Masonry Core Bits plus above Core Drill Bit to do the job?

I would like to buy a tool not rent one because i would like to own a tool for future use. I am in the process to finish my basement. I can see i will use this tool to drill holes to anchor frames to concrete in many places.

thanks,

Ron6519 02-19-2011 07:12 PM

Quote:

Originally Posted by diy001 (Post 593851)
I want to drill a 2.5" hole through a 10" internal concrete wall for my 2" washer drain.

I did some research. I think I need this core drill bit: SDS Carbide Masonry/Concrete Core Drill Bit 2.5" x 6".

Can I use this Bosch 11255VSR BULLDOG Xtreme 1-Inch SDS-plus D-Handle Rotary Hammer with this SDS-Plus Shank for Carbide Tipped Masonry Core Bits plus above Core Drill Bit to do the job?

I would like to buy a tool not rent one because i would like to own a tool for future use. I am in the process to finish my basement. I can see i will use this tool to drill holes to anchor frames to concrete in many places.

thanks,

Where does this pipe go when you drill the hole? Cesspool? Sewer connection?
Ron

diy001 02-20-2011 06:02 AM

Quote:

Originally Posted by Ron6519 (Post 594126)
Where does this pipe go when you drill the hole? Cesspool? Sewer connection?
Ron

it will connect to a 3" Sewer pipe.

Daniel Holzman 02-20-2011 08:19 AM

I drilled a 2-1/2" diameter hole through my 10" concrete wall for a sump pump connection. I rented an electric Bosch rotary hammer (I do not remember the model number) with a 2-1/2 diamond coring bit. The process was relatively slow, but quite effective. The stand was critical, the tool I used had enourmous torque, enough to take your arm out of the socket if you tried to hold it by hand. The bit also had a habit of catching if it was not held exactly perpendicular to the wall, then the drill would start to rotate the stand. I had to be very careful about that, it happened several times.

I know there are several manufacturers of rotary hammers, I can't comment on which ones are better. I can say that I filled the space surrounding the pipe with expanding foam, and sealed the face with about a 1/2 inch of hydraulic cement. This has worked well for many years now.


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