Drilling holes in concrete: step by step instructions

Concrete is an extremely tough and strong material, difficult to work with. Drilling concrete is a labor-intensive process that requires special equipment, skills and abilities. In this article we offer you an overview of the main rules and requirements for drilling.

  • Drill Tools.
  • Peorator.
  • Chisel.
  • Hammer.
  • Drills (metal and hammer drill bits).
  • Dental or diamond drill bits.
  • Drilling machine (for diamond drilling).

At the moment, most buildings are erected on the basis of strong concrete slabs. And you will likely have to face the need to drill concrete walls sooner or later. And given that there are often also rocks and steel reinforcements in the construction, the task becomes really difficult. Even if you have a box drill and a power drill. To make the work easier and clearer, you need to initially choose the right tools and study the step-by-step instructions on which to drill holes in concrete.


The high strength and reliability of concrete structures requires the use of special tools and attachments. The way you drill needs to be determined before you start, based on the desired hole diameter and the presence of reinforcement in the concrete slab. Without analyzing the material beforehand, it is not possible to drill the hole into the concrete precisely and neatly.

Modern cutting nozzles used in the drilling process allow you to make holes of almost any depth and diameter. They vary in length and shape. Such nozzles allow you to punch a strong concrete slab without much physical effort. But for small diameter holes, you can use a drill or burr. The cutting nozzles are equipped with a carbide tip and their core is auger shaped. This makes it possible to penetrate into a hard concrete surface without any problems.

If you use an impact drill, you should choose drill bits with a cylindrical shank. Their surface should be flat and smooth for better sliding.

Useful tip: your cutting tools become considerably blunt during drilling. From time to time they have to be sharpened and then continue working. And if you use pobedite drills don’t forget that they are susceptible to high temperatures. So you have to take breaks and let the drill bit cool down. However, we also recommend lubricating the drill bit with a special fluid that lowers the heating rate.

In order to drill a large hole, you need a concrete drill bit. It is a hollow cylindrical cutting tool. Its key feature is that all cut material goes inside the cylinder. That way, the core doesn’t have to be held back to make sure it doesn’t go all the way into the slab. Some of the drill bits are equipped with special cutting segments or high-strength diamond drill bits.

If you’re using a peorator, it’s best to use bits with hard metal alloy teeth. Diamond spraying is needed when there is no impact drilling with coolant. Wear resistance is a big advantage. However, it will still dull in use and you will have to rebuild it. If you are drilling a small hole, such as a hole for a socket in concrete, you can hold the tool in your hands. For more demanding work during drilling, it is necessary to anchor the special drill rig to the wall.

Among the most commonly used tools are poehorators and electric drills. They are perfect for drilling holes up to 10 cm. But reinforcement in the concrete can easily break the drill bit or teeth. That’s why we advise against using core bits for drilling reinforced concrete structures.

Always first study the characteristics and features of the drilling tool and material, and then choose the best option. If you can not use a peorator, you can use an impact drill. But keep in mind that the efficiency of such a tool is an order of magnitude worse. But for small amounts of work, it is quite enough for you.

Drilling large diameters is a particularly difficult task. Here you have to use diamond drilling holes in concrete. It is quite difficult to produce it by yourself. You also have to use a hammerless power tool with the option of bringing water to the surface of the concrete at the place of drilling.

Assembling a machine

Metal stands are assembled from angles for the carriage, 50×50 square tube for the stand and 10×10 for the drill bracket, strip for the base and eyelets. The base and the bracket are welded together and all elements are bolted together. It is recommended to make several brackets with different adapters (clamping rings) for different types of drills. The carriage is guided on the rod by means of a steel wire wrapped around the handle drum. To prevent the carriage from having play and falling down under its own weight, it is drilled, threaded and the bolt (or several bolts) is screwed in. The backlash between the carriage and the future drill stand is thereby eliminated. Handlebar is made from 6. 8 mm rolled steel.

With several brackets with different clamping rings it is possible to flexibly fit drills and process almost any material.

In the future, homemade equipment can be upgraded and refined, for example, to mark or install a scale that will indicate the length of movement of the carriage. It helps when drilling blind holes.

There are several ways to mount it:

The easiest way to make a homemade drill at home

A homemade drilling machine from a drill will never replace a factory-made one and will always be inferior in quality of assembly and drilling accuracy. The main advantage of self-made. low cost, the ability to drill a hole when the factory machine is not available for one reason or another.

Drilling is one of the most common technological operations in carpentry, so every craftsman knows how important it is to make a hole quickly, and most importantly as even and clean as possible. When there is a drilling machine at hand, it is no problem to drill a hole smoothly and quickly. Conversely, when it is not there, the quality of drilling long holes can be difficult. In this article we will offer one of the options of a drilling machine from an ordinary household electric drill or.


Drilling Tools

The drilling tools (sometimes called consumables) used for construction drilling are shown in the picture. Let’s describe in the order of numbering:

  • Shock twist drill bit with tungsten carbide insert is used for drilling small, mostly blind holes for dowels, etc.п. Distinguished from carbide drills in metal, which are unsuitable for percussive drilling, by the protruding edges of the liner. Often the working end of such drill bit is painted red. Shank. round. It is not the diameter that is indicated in the symbol, but the caliber. the distance between the edges of the insert. Working revolutions. from 400 for 13 mm to 800-1200 for 4 mm. Such drill bit should be purchased with caution: the market is full of “alternative” junk with substandard liners and the body of raw metal, which folds into “ZU” at the first holes.
  • Concrete augers. Sprayed or tungsten or zirconium carbide tip. Shank. most often SDS or SDS Max. SDS drills are available in diameters from 6 mm to 76 mm and in lengths up to 1000 mm. Operating RPMs from 400 to 60 to 100; the larger the diameter, the lower the RPM. Thanks to small operational speeds drilling holes in concrete with such working body is quiet and dustless: a good brand-name drill can work in a living room without taking out furniture, just clean the carpet and put a film on the floor: dust is like a jet and almost does not fly in the air. Most SDS drills do not require impact drilling in concrete up to 600 grade.
  • Diamond core drill. Professional durable and highly productive working tool. Drilling. only rotary. Used most often for mass electrical installations to drill holes for undercounter sockets. In the hands of a pro it takes no more than 5 seconds per hole. Not recommended for do-it-yourselfers: Without a steady hand, it is easily damaged and expensive. Manufacturers guarantee durability and reliability of diamond core drilling at 2500-3000 rpm, with precise observance of technology and rules of work: “air” feed and not the slightest slippage or slipping.
  • Tungsten carbide core drill bits with pilot drill bit are general purpose drill bits, suitable for home use by non-professionals. Preferred drilling mode. rotary. Durability, of course, is dozens of times less than that of diamond drill bits, but several hundred holes are not the limit for a good brand drill. Not as sensitive to tilting or push-feeding as diamond drill bits, but if they hit reinforcement, all teeth immediately crumble. Working speed. medium and above medium, 600-1200 rpm.
  • Segmented diamond core drills. Purpose. professional diamond drilling in any concrete grade with any inclusions, including through armature. Although the bodies of diamond drill bits are made of cutting-edge materials, they are even more finicky in their work than diamond drill bits. Masters who are able to work with diamond drill bits till their calculated wear and tear are literally in a count. Drilling conditions. the same as for diamond drill bit.
  • Working body of the power drill. Length. up to 1500 mm and more; Caliber. up to 300 mm. The fruit of the most modern technology: this, outwardly subtle design, chews the strongest industrial reinforced concrete so that the dust and crumbs gush out of the hole in a dense fountain. Drilling conditions. strictly according to tool manual.

Note: in use till now there are still composite, threaded, percussive drills of “soviet-shashash” type. Only the contemplation of such drill with the caliber of 20 mm and length of 1200 mm, with the shank cut to 10 mm, and set in the three-jaw chuck of 280 W konakovsky drill, will satisfy the most demanding extreme fan. If you happen to work with such a drill and it gets stuck in the wall, don’t reverse the tool to retrieve it, it will unscrew and you will spend at least an hour of your working time blindly screwing it into the wall and pulling it out.

Drilling in concrete

Once you have chosen the tool and drill bit, you can begin. The first thing to do is to carefully prepare the surface and make sure that in the area where the hole is planned, there are no electrical wires, water pipes and heating system. The metal detector will help in this. Use it to find out if there are any metal objects in the wall and how far from the surface they are located.

Once you are sure that there are no obstacles to drilling, you can proceed directly to the main part of the work:

  • Mark the spot on the wall where the hole is to be made.
  • With a low rotational speed of the drill bit make a hole.
  • Switch on the impact mode and gradually increase the rotational speed.

It is not uncommon to drill a concrete wall under plastic dowels. In this case, the hole must be deeper than the length of the dowel. Drilling causes the concrete to break up, so the hole is filled with small particles of material. It is necessary to leave a margin of about 1 cm.

Anyone who has ever worked with a drill knows that it is not easy to hold a drill in the right position during work. There are at least two reasons for this:

To avoid dust in the eyes, as well as to protect against dusting of the tool itself, you can use a special device. a dust collector, which can easily be found on the modern construction market.

Dust, settled in the hole, can cause unreliable anchor fixing in the wall, so you should try to remove it completely from there before hammering in the dowel. A canister with compressed air can help get rid of concrete dust. You can also use a rubber blower for this purpose. Remember that during the blowing of dust you must never remove your protective equipment.

The diamond drilling method

Before you drill into a concrete wall, for example for a socket, there is another effective drilling technique that you should know. We will talk about the so-called diamond drilling, which allows you to quickly enough and without excessive dust to cope with the task at hand. It should be warned that for this you will need special equipment, which is a set consisting of an electric motor, a stand secured to the base, and a drill crown.

The construction of such a system makes it possible to cool the working tool by delivering water to the place of drilling. At the same time, the water washes away the dust, so it does not have time to penetrate into the surrounding area. With the help of a special water vacuum cleaner, also included in the set, the place of work is cleaned.

Preparation and process

Before you drill into a concrete wall with an ordinary drill, it is first necessary to inspect the tool, check that it is in good working order, and then insert the entire drill bit until it stops.

Then you have to inspect the wall and see if you can hit any wires or cables. If possible, it is also worth making sure that there is no reinforcement, if not a diamond drill bit is used. If there may be rebar in the path of drilling, a metal drill bit must be prepared.

Before you start drilling you need to protect yourself: wear thick gloves, safety glasses, earplugs or earphones.

Drilling the hole

First you need to mark the place and choose the depth. On modern models there are usually special limiters. In their absence, you can put a mark on the nozzle.

A few examples will help you better understand how deep you need to drill: for a picture or a light shelf, 2.5 cm deep is enough.

Drilling with special bits Source minemegashop.ru

When installing the dowel, the hole must be a few millimeters longer. When the dowel is inserted, dust will form, which will take up extra space.

In a brick or concrete wall, the hole is drilled in several steps:

  • After selecting a place and placing a mark, place the tip of the nozzle and turn on the medium speed without turning on the percussion mode.
  • Increase the speed and impact mode after penetrating a few millimeters. This allows you to continue drilling steadily, without deviating due to strong vibrations.
  • Every 10-15 minutes you should stop and let the motor cool down. Do not continue until the tool has cooled down completely.
  • If you want, you can regularly moisten the nozzle with water, so that the metal does not warp and overheat.

Working with a punch will require more time and labor. The tool itself is needed when the wall is too hard and the drill can’t handle.

Using a stopper Source mebel-expert.info

Tips for the craftsman

Different tools need to be used when working. Concrete is often faced with different material. each requires a different drill bit. Professionals are able to sharpen the drill so that it passes freely through concrete and other materials, but it requires considerable experience. When starting the work, the following recommendations should be observed:

  • if the hole must penetrate deeper than 10 cm with a diameter greater than 12 mm. work with a peorator;
  • Start drilling at minimum rpm, attaching the percussion function only after deepening the tip by 4 mm;
  • Drill holes for dowels must be made 10 mm deeper than the plastic body of the fastener.

When the drill jams, you need to take it out, and then work out the hole with a puncher, breaking the interfering stone.

How to make a hole with a drill

First you need to prepare a drill, nozzles and other related items. Then you won’t have to get distracted and waste time looking for the right things in the process.

Drilling is often necessary in cases where it is required:

In this case, the concrete wall (if it is properly drilled) should remain without severe damage and large chips.

When using a drill with a pobedite bit, it is sometimes necessary to use a metal punch. It is selected according to the size of the hole. This tool enables the drill not to jam when drilling. To do this, the drill is driven into the concrete and hammered to break apart the hard obstacle. This process can take quite a long time, so it is better to use a diamond drill bit. In addition, a drill with this attachment will never get stuck in the concrete.

Sequence of operations when drilling:

  • Inspect the tools carefully. The drill must be in good condition and the drill bit must be intact.
  • Start gently drilling a hole in the concrete with the drill, stopping the continuous operation of the tool after 10 minutes from the beginning of the action.
  • Do not continue drilling until the motor has cooled.
  • Wet the nozzle with water before drilling the next hole. This protects the metal from being distorted.

These are simple ways to drill through a concrete wall without a torch.

Sometimes there are cases when a drill bit gets stuck in a wall. Use force in this case is not desirable, otherwise it will break, and the edge of the nozzle will remain in the concrete. To release the drill, you must first disconnect it from the drill, then put on a drill bit with a smaller diameter and pull out the jammed part.

To perform drilling yourself and thus avoid various injuries and unpleasant accidents, you need to follow the safety precautions, and follow the recommendations of experts.

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