How to make a hole in a concrete slab?

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A frequent question that comes up during repair and construction. Can anyone write detailed instructions? 

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You must first decide on the following: What kind of slab (concrete) are we talking about? Hollow-core slab, light-core slab, full-core slab? The hole can be either through or "deaf". What diameter of the hole do you need?

On the basis of this selected tool and the method of drilling.

It is also necessary to take into account how exactly you want to drill the slab from the bottom up (ceiling) or from the top down (floor).

Drilling and holding the tool by weight under the ceiling is much more difficult than making a hole in the floor.

If we are talking about the floor slab, its thickness (e.g. the thickness of the encased slab) may be even less than the thickness of the load-bearing concrete walls (panels) in the apartment. That is to drill it even easier than the walls.

If the diameter of the hole is not significant and especially if we are talking about a "blind" hole (e.g. under the installation of dowels), then you can drill a slab and perforator. But you need a powerful hammer. I have a professional hammer power of 2.2 kW, in general, no problems when drilling in concrete and slabs as well. Of course, we are talking about net hammer (there are also cordless, but this is a less powerful tool). The hammer needs such a drill bit for concrete. (pic) The length of the drill is also different, be guided by the thickness of the plate (and it is different), if of course we are talking about through-hole.

First we make a marking and determine the point of drilling. Then we core, otherwise the drill will be carried away to the side on the approach. Insert the drill into the chuck of the hammer. We set the hammer in the mode "drilling with impact". The tool is held at right angles to the surface, otherwise the drill (or rather the auger) will "jam". RPM look already on the spot, the diameter of the hole plays a role, I usually set the average speed. All, let's drill, put pressure on the hammer, but not much, that is, the pressure is constant, but without fanaticism. If necessary, then periodically remove the drill from the hole and cool it, you can water. It is better to drill 2 drills, at first the hole is smaller in diameter, then the desired one.

That is, there is no special difference that you drill a slab (ceiling) or panels (walls) drilling principle and tools can be the same.

And another thing, concrete slabs are reinforced, you can get on the armature, there are several ways out, or drill a hole in another place (near), or go through the armature drills on metal in the mode of "drilling without impact), or the armature can be cut, but it is important to consider the depth of the "occurrence" of the armature and the diameter of the hole.

There is also a variant of "diamond drilling" (drilling with the use of crowns for concrete) holes, but here you need a special tool, for one-time work it makes no sense to buy it.

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