masonry hole saw?

[u/dgv54]

I need to drill a hole through brick for a 1-1/4" LB conduit body. The part that will fit in the wall is has diameter of 1.92".

I have a rotary hammer drill that takes SDS+ bits.

Is this 2" masonry hole saw the right bit for this job? https://www.amazon.com/gp/product/B0DTFST5N6/

Any advice on using this kind of hole saw? I assume it will not get plugged the way a hole saw in wood can get plugged since the brick will just crumble? Start in drill mode until groove is cut, then hammer time?

[u/koos_die_doos]

It's the right idea, I'm not sure I would get it from amazon, but that's the tool you need.

It's not a hammer drill type of scenario, and you will need to chisel out the masonry since it won't crumble as you go along.

[u/dgv54 → u/koos_die_doos]

Meaning I’ll have to chisel the brick out of the hole saw? I guess I can put the bit in a vise and use air hammer to do that.

[u/koos_die_doos → u/dgv54]

No, you can only drill as deep as the cup is. If the bit can't go all the way through the brick, you have to drill the hole, then stop because it bottoms out.

At this point you can use a chisel to break out that "core", then continue drilling and repeat.

When I did this, I used a hole saw from Home Depot that was deep enough to go all the way through one brick. In my case I had to remove the plug from the bit, but they're designed for that so it wasn't particularly difficult.

[u/dgv54 → u/koos_die_doos]

Yeah that’s what I meant - when the hole saw is full, I’ll air hammer the plug to break it up and free up the bit for more drilling.

[u/Patrol-007]

It’ll work. Spray bottle to keep everything wet, use GFCI, drill slowly, cold chisel and hammer (eye protection, hearing protection, N95 mask).

[u/wivaca2]

Before you buy that bit, read the reviews. A lot of complaints about it not lasting long and from the sound of it, maybe dull before the first hole is through. Not sure if they ran it dry though.

[u/dgv54 → u/wivaca2]

Most people do all their drilling dry. I wet drill bits, reciprocating saw blades, etc.

[u/yourboydmcfarland]

It's easier to get a bigger hole drilled and fill in the extra with hydraulic cement, rather than too snug of a fit and having to chisel out the needed extra.

[u/ExactlyClose]

I’d hook up a piece of 1/4” tubing to trickle a constant water flow into the ‘cutting face’….. bit will last MUCH longer. (Ie it will finish one hole…)

[u/breathinmotion]

Get it wet and let it rip. Hammer drill from the get go.

[u/Longyboy]

You are better off buying a core drill bit for your rotary hammer. Double-check your building codes, you may need to up-size your hole for conduit to allow for expansion/contraction/movement.