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I need to drill a 1.5 inch hole in 103 year old cement b

Geo-TH,In

Geo-TH,In

Well-known Member
The block is more like steel than cement.
cvphoto153036.jpg


cvphoto153037.jpg

I need something to drill a hole through 8
inch block from inside the basement.

If these don't work I can return them.
Amazon pays return shipping.

I'll let you know how they work tomorrow.

I need to run 1.5 inch PVC conduit through
the wall.
 
we used diamond tipped core drills to get concrete cores for testing---they did come up to 6 inch diameter and they were water cooled
 
I think 1-1/2 inch conduit has an outside diameter of almost 2 inches. I don't think there's an appropriate saw in that set for what you want to do. Nor do they appear to be anywhere near deep enough to penetrate a typical solid concrete block.

Rent a rotary hammer and appropriate core drill and you should have no problem boring your hole. More importantly, you won't end up in the emergency room, like my BIL did when he tried to drill big holes in concrete with the wrong tools.
 
At the risk of being poo pood I will suggest getting a core dill rig to drill your hole. Drilling with a whole saw thru concrete could be a recipe for an ER visit with broken bones. Only takes a split second for that thing to bind and catch and whoop you. Do as you wish, take it slow and e-z. gobble
 

Yes, 1.5" pvc conduit is 1 .9" so he will have to use the 2-9/16" hole saw.

That will leave plenty of room for packing.

If it is conventional cmu, it might get tricky trying to drill that big of a hole when the hole is larger than the cavity.

If a solid block, he can drill until it bottoms out. Then knock out that much with a star drill. Then drill some more with the hole saw.

If a conventional cmu with cavities, I would drill initial hole thru center of a block cavity. Then open it up with star drill. When I got close to finish size, drive a hunk of 1-1/2" iron pipe thru the block then remove.
 
Mark
This 1920 block isn't any concrete block you have ever seen. It's longer than 18 inches and has 3 holes. I've drilled a hole once before. I'll measure where I drilled before. The old hole saw I used is worn out.
If I don't have a proper bit, I'll send it back. That's why I bought a kit. I can always drill bigger hole and use mortar to fill in around the PVC.
I'll drill small holes and make sure I hit the opening big enough.
 

To make cutting in masonry a little easier and to keep the blade cool cut a core from sponge with the hole saw first . Put sponge inside hole saw and soak with water . As you cut the pressure forces water and debris out and cools the blade . Dip it each time you withdraw the saw . A hammer drill with a chisel will chip out the core and allow you to cut deeper in stages.
 
The only thing I don't like about that set is their isn't a stop to the hole saw mandrel. It just screws on meaning as you are using it the bits are going to get tighter and tighter. Then when you go to take the bits off you will have H doing it. You might consider renting a core drill instead of buying the tools. With that set you will drill a couple inches in and then have to break up the cement and then go another couple inches and do it again. Eventually it will get very difficult to break up the cement since it is in 2 segments.
 
I just did this at my dads house for a drain.I needed a 1-1/2 hole,for 1-1/4 PVC.I couldn't find a big enough bit for my hammer drill,and my rock drill weighs over 80 pounds.Plus they didn't really want me running the air hose through the house and down the stairs.So we looked into it and rented a drill and bit,cost about $40.Took longer to carry it in and down the stairs than it took to do it.
 
The 3 things you need to know about concrete is: It get hard, It cracks, and hire it done. With hiring it done the most important! I would hire a concrete, plumber or electrical contractor to bore the hole for me.
 
OK, George, tell us what happened. It looks like you can still type, so you must still have at least one good hand to work with.
 
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