How to make a hole for a can in a block from the 70s - bearing wall

Question

Hello. I have a problem because I bought a drill bit for cans. wrote to concrete, size 60 cm, so it suited me. In one bearing wall I drilled maybe 5mm for 30 minutes, and in the other it went smooth (there was a hollow block inserted, when I knocked with a hammer it fell out on the other side;...

pavulon · Answer

No wonder it didn't go when it is 60 cm.

Seriously, what material do you want to drill? The load-bearing wall is not a material, apart from the fact that you should not disturb the load-bearing wall structure.

Did you buy a drill or a lace? for dry / wet drilling, with / without impact ??

marian_em · Answer

Did you accidentally buy a lace that looks like a coiled saw? If so, it is not surprising that he does not want to go into concrete, there are special bits for concrete, besides, for drilling in a large slab, you also need a piece of a good drill

Miwhoo · Answer

Lace with a diamond blade is the best for reinforced concrete, it will even cut the reinforcement, but you have to drill it without impact so as not to damage it. For easier guidance, you can first drill the "pilot" with the fi8 drill, then the guide drill into the hole and a little patience :)

Diamond crown:

Widia is good for drilling with an impact, but you need a drill with a good impact [electropneumatic or other, but not based on gears flying in a row, as in cheap drills from a market]. For example, the makita HR2470 is suitable.

Vidia lace:
How to make a hole for a can in a block from the 70s - bearing wall

Did you drive a Widia or a diamond one? Or maybe one for wood?

Other than those from the photo, they are not suitable for concrete.

cepilek · Answer

I will just add that a large plate, every 17 cm, has empty spaces depending on the construction, of course, and drilling in this place is more effective, because any hole, once you get it, you can enlarge it with any pneumatic hammer, you just have to think a little, sometimes you have to break a little plaster and soak it properly, light a cigarette and when you finish it, in a place where it dries faster or where the concrete is lighter, there are voids in the large slab ... It requires experience, and if it is not enough, drill holes every 5 cm with a diameter of 10 mm until you come across a void and in this place only with the above-mentioned lace .... You will save yourself a lot of time and nerves ...

dzajdol · Answer

more like a widiowa, it had more teeth, it looked like a ball in a circle.

What brand of lace - how much do they cost and can you buy them in castorama, leroy or practical, because I just bought in a practical, I wrote to concrete and Bosch, I thought that I would be fine: p I was obviously wrong

Arturo2005 · Answer

So?

zdzisiek1979 · Answer

Diamond crown fi. 65mm 68mm either, but it's a dirty job an angle grinder and diamond blade and cutter.
As an impact crown, the drill should have at least 2J and 700W of power to prevent the machine from falling.

Added after 2 [minutes]:

Or you draw the outline of the can and drill holes and chisel and forge until you make it.

dzajdol · Answer

Yes - yes :) What brand of lace - how much do they cost and can you buy them in castorama, leroy or practical, because I just bought in a practical, I wrote to concrete and Bosch, I thought that I would be fine: p I was obviously wrong

Miwhoo · Answer

Well, buddy, you massacred a wood ball on a concrete wall ... it is suitable for plasterboard, but not for reinforced concrete :)

Buy a lace for a specific purpose and don't let the wood drill bit stick in a second time

zdzisiek1979 · Answer

In 30 minutes, instead of 5mm, you would do it, definitely 2-3 holes for the cans by drilling holes and forging by hand.

Arturo2005 · Answer

And it said concrete? Probably fresh

Miwhoo · Answer

To be precise, let me just say that the one from the Arturo2005 photo is for metal

zdzisiek1979 · Answer

The Bosch impact crown 65mm cost me PLN 270, but it's for SDS plus. And such a bimetallic one can be used for aerated concrete, although it is a pity to waste money.
There are certainly diamond deders in supermarkets, but you need to buy a drill handle and a lace, it will be around PLN 150, they are impact-free with probably four diamond plates.

dzajdol · Answer

Well, I will have to drill a few holes around with a small drill and a hammer and chisel

then some plaster and it will be.

Thanks for the help.
I especially need advice with water to see where it will be easier

How to make a hole for a can in a block from the 70s - bearing wall

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