Mode of operation with a hammer drill in chiseling mode

Medium and heavy rock drills

Corded hammer drill with removable chuck set for drilling, drill and chisel

The fundamental criterion that determines whether a tool belongs to one type or another is the power of the electric motor. The more powerful it is, the larger in size, and therefore, all parts and assemblies of the perforator have a greater weight and safety margin, which ultimately determines the total weight and dimensions of tools of various brands. However, they all have the same number of operating modes, namely: drilling, drilling and drilling. The transmission of the shock impulse to the cutting tool is due to the electro-pneumatic circuit located in the perforator body. It should be noted that in the chiseling (chiseling) mode, it is not worth operating the tool for a long period, since the main task of the hammer drill is hammer drilling.

Most professional and household rock drills come with SDS plus and SDS max chucks, allowing you to quickly insert and remove the cutting tool. For drilling, a jaw chuck with an adapter is used, which is inserted into the SDS chuck. To limit the drilling depth, a stop is used, fixed on the punch body and fixed with a screw.


The drive of the unit transfers the rotary motion from the motor to the shaft. Compared to the drill mechanism, the hammer drill’s impact system is more complex. Consumers who rarely have to use such tools can get by with the first unit. it is suitable for drilling and crushing bricks and soft concrete.

Uncompromising drilling in tough materials is available to rock drill owners. The equipment allows you to quickly cope with tasks that take longer for simpler counterparts. The purpose of the punch depends on the class. The unit under consideration allows:

  • chipping off layers of cement;
  • beat off ceramic tiles;
  • destroy the roadway.

Diagram of the device of the inner part of the punch.

precisely, it is recommended to select models, focusing on the task at hand, the degree of complexity and the required diameter.

how to turn a drill into an automatic chisel

Manufacturers offer a wide range of products that can drill, chisel, hammer drill and have 3 operating modes. The latter function is characteristic only for the light class rotary hammers.

Heavier machines do not have surface drilling function.

Tool classification

The perforator belongs to one class or another is determined by its functionality and feasible tasks. Such units are distributed by classes, focusing on their weight. Specialists distinguish the following classes:

  • easy;
  • middle;
  • heavy.
mode, operation, hammer, drill, chiseling

The first class is represented by tools, the weight of which does not exceed 4 kg. They are used by non-professionals in everyday life. The power of the device reaches 400-700 W, and the impact energy does not exceed 3 J. They can be used to drill small-diameter holes in concrete (for dowels). The presented models are used as an electric screwdriver. The light class hammer does more hits and turns, but with less force.

The middle class is represented by equipment weighing 5-8 kg. The impact energy in certain models is capable of reaching 8 J. They can be used on reinforced structures if it is supposed to break concrete and cut metal gratings.

The heavy class is represented by machines weighing more than 8 kg and a power of 1200-1500 W, which are capable of making holes with a diameter of up to 50 mm with a solid drill and over 120 mm with hollow crowns in hard rocks and concrete.

The layout of the instrument may differ depending on the class. The lightweight rock drill has a horizontally positioned motor, while in heavier models it runs vertically.

Basic rules for safe work with a puncher

  • Before work, the tool is subject to mandatory inspection in order to identify a malfunction of the electrical cables.
  • Allowed to work are persons at least 18 years old who are familiar with the basic rules for operating the tool.
  • The room where the work is carried out must be dry. It is not allowed to work with the hammer drill without rubber dielectric gloves.
  • Avoid skewing the drill bit when drilling, which can crack or fly apart.
  • A feature of working with a perforator is the inadmissibility of using excessive forces on the tool.

Professionals know how to work with a puncher. This tool is designed for drilling holes in concrete and other hard materials. The corresponding pneumatic mechanism, which includes an intermediate shaft, a barrel, a piston, a cylinder and a striker, is responsible for generating a blow in a perforator (as opposed to a drill). First, you should find out how the tool itself works.

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Diagram of the device of the outer part of the punch.

Punching Techniques

First of all, when operating the tool, you need to clearly remember that it is not allowed to press on the handle when drilling, but only to direct the drill or drill in the right direction, since drilling with a blow is carried out by the percussion mechanism of the perforator. Do not forget that the handle can be set to a position convenient for you by moving it around the punch body.

All cutting tools (drills, drills, chisels), or rather, their shanks must be lubricated with a special grease before work, which will extend the service life of the hammer drill chuck and reduce the load on the parts of the entire tool, including the electric motor.

The basic techniques of working with a perforator can be considered on the example of preparing a wall for the installation of electrical wiring and the installation of socket outlets. Omitting the marking process itself, let’s start by making a groove for the socket. To do this, as a cutting tool, we need a diamond crown with a diameter of 68 mm, a drill. drill d 7 mm and a nozzle for chipping. The latter looks like a chisel with a blade at the end. First of all, we will take up the place where the outlet will be.

To do this, insert a drill d 7 mm into the perforator and make a recess to the size of the socket height. This will serve as a direction for the diamond bit, into which a pilot drill is also screwed in, but with a larger diameter, so it can escape from the marking. We insert the crown into the tool and begin the drilling process, in which it is imperative to moisten the very place in the concrete wall with water. This can be done with a small diameter hose or, at worst, use a spray bottle to care for indoor flowers. When the diamond bit is deep enough, stop drilling. Then we remove the unnecessary concrete material using a chisel with a spatula inserted into the perforator.

When the place for the outlet is ready, you can move on to the wall under the electric cable. This is done with a 7 mm drill or you can use a drill up to 10 mm, with which we drill recesses in the wall with a minimum step along the entire mowing line going to the socket. With the help of a chisel, we bring these grooves to the state of the groove (rod) for the cable. It is worth noting that during all work a lot of dust is generated, which then settles in your upper respiratory tract and on the surfaces of the room.

As you can see, this example describes the main operating modes of the punch, which can be divided into various operations that you will perform during the repair.

How to work with a hammer drill in slotting mode

The main purpose of the rock drill is to drill. This distinguishes it from hammer drills, whose main task is to drill. However, in addition to hammer drilling (drilling), the capabilities of a professional three-mode rock drill include drilling mode (drill mode) and non-rotating chiseling mode (jackhammer mode). The hammer drill allows you to work on almost any material. concrete, stone, foam concrete, brick, metal, wood, ceramics, plastic and so on.

Consumables Chisels, lances, drills, drills, etc. are used as consumables in perforators. The perforator chuck is designed for those “nozzles” that are used for perforation and chiseling modes (drills, chisels, lances). The drills are attached to the rotary hammer shaft through the SDS-Plus replaceable chuck.

Drilling The rotary hammer chuck is replaced with the SDS Plus keyless chuck. After that, a drill is installed corresponding to the type of material that is planned to be drilled. In this case, a wood drill is used. The tool is put into rotation mode. This is the mode in which a conventional drill works. You can adjust the number of revolutions during operation. the more you pull the trigger, the faster the rotation speed. Also, the number of revolutions is preset by an electronic limiter located directly on the trigger.

Slitting Old ceramic tiles are dismantled by slitting. A chisel is clamped into the tool holder. Then manually adjust the angle of the chisel direction. so that it is convenient to work with the surface. Having set the chisel at the desired angle, its position is rigidly fixed with a special lever located on the punch body. The tool is transferred to the chiseling mode without rotation (jackhammer mode). The end of the chisel is inserted into the tile seam. Gradually increasing the impact speed, the tiles are channeled from the edges to the middle.

Destruction of the surface To make a pothole in the concrete surface, the non-rotating chiseling mode is also used. A lance with a wide spatula is fixed in the tool holder and fixed at the desired angle.

mode, operation, hammer, drill, chiseling

Drilling (perforation) A drill is fixed into the drill chuck. The tool is put into rotation mode with a blow, and work is started. The higher the power of the rock drill, the better its performance, i.e. the hole is drilled faster. Starting work at low speeds, gradually bring to the maximum number of revolutions.

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Tightening screws The tri-mode rotary hammer can be used as an electric screwdriver. A conventional chuck is replaced with a keyless chuck. The screw is clamped in the chuck and the tool is turned into rotation mode without impact. Set the desired direction of rotation using the reverse. Set the rotational speed as low as possible. Install the punch perpendicular to the surface and screw a screw into it at low speeds. If you reverse the tool in the opposite direction, you can unscrew the screw.

–- for screwing / unscrewing screws, of course, it is more convenient to use a separate tool. an electric screwdriver, since it is lighter than a hammer drill and smaller in size. However, for screwing in a small number of screws (5. 6 pieces), the use of a hammer drill is quite justified.

Rotary hammer Makita 2450 FT SPECIFICATIONS

Power 780 W; speed up to 1100 rpm; number of blows up to 4500 / min; impact energy. 2.7 J, power 640 W, maximum drilling diameter: concrete. 24 mm, steel. 13 mm, wood. 32 mm; weight 2.4 kg.


The hammer drill is a very handy tool and reliable assistant for those who make repairs to the premises or carry out one-time work related to drilling, plumbing holes and depressions in concrete, brick, stone and other materials. The tool is respected and not cheap, so how to handle it depends on its service life. In addition, keeping in mind the following tips for using the rotary hammer will help you avoid unexpected injury.

Taking into account the peculiarities of working with a hammer drill, you must first of all decide what type of tool suits you best. The numerous family of rock drills of various brands and manufacturers can be divided into three groups: cordless, medium and heavy.

Operating modes of the device

In the first case, the tool must be switched to the drilling mode without impact. The toggle switch is installed at the drill mark. Then the last element is installed. The instrument is switched on by pressing a button. The perforator does not require strong pressure in this mode, the pressure on it should not exceed 5 kg.

The use of drill chucks is incompatible with drilling under impact and counterclockwise rotation, as there is a possibility of damage and separation of the chuck from the device.

To prevent such a situation, the built-in shock blocking function helps, which is desirable to activate if it is necessary to make a hole in metal or wood.

Before starting to use the equipment, it is recommended to check the mode by setting the appropriate one. The device should idle for about 1 minute. It is advisable to monitor the functioning of the gearbox. The switched on tool should not emit extraneous vibration, noise or knocking. The presence of smoke or a burning smell should be alarming.

The impact mode is used if there is a need for chiselling, hammering or chipping. The toggle switch is mounted at the hammer mark. It is recommended that you hold the rock drill firmly with both hands. You can move it to the place of impact after turning it on only by applying force.

You can drill by moving the toggle switch on the device opposite the drill and hammer markings. Previously, the first element is positioned at the drilling point. Tool include. Care must be taken to ensure that the drill does not move. Concrete surfaces are dangerous for collision with reinforcement. Experts recommend taking into account such a probability in advance and taking a comfortable position.

What not to do with a hammer drill

The hammer drill can even be used as a concrete mixer. Many craftsmen use this tool to mix grout or tile adhesive. But hammers, despite their large size, are not very suitable for this. They do not have reduction gears like slow speed drills. Therefore, during mixing of thick and viscous mixtures at low speed, the rotary hammer motor experiences greater loads than when drilling concrete. And this negatively affects its durability.

It should also be remembered that chiseling without rotating the chuck is an auxiliary function of the hammer drill, and not the main one. The design of the tool is not designed to work in this mode for a long time. If you have to perform large volumes of dismantling work or cut a new opening in the wall, then it is better to take the appropriate tool: a jackhammer and a diamond circular saw.

How to work with a puncher

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Rock drills are designed for applications such as drilling and drilling in durable building materials. They have several modes of operation and chucks that allow you to use different attachments: drills, drills, lances and chisels. This ability makes the hammer drill a versatile tool that can tackle complex tasks.

Drilling mode

In drilling mode, the hammer drill works as efficiently as a conventional drill. Difficulties can arise only due to the fact that the hammer drill is larger and heavier than a drill of the same power.

  • Start drilling at low speed and without pressure. When the drill has made a hole a few millimeters deep, you can press down on the tool with little force.
  • Do not press down on the punch too hard. Overloading the drill can jam in the hole and be difficult to remove.
  • During operation, periodically remove the drill from the hole to clean it of dust and debris that interfere with work.
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Always use special drills: some for metal and others for concrete. Drilling equipment for different materials differs in design and geometry. Drills for metal and concrete can be easily distinguished by their sharpening angles and the size of the flutes for evacuating chips or stone chips. In addition, concrete and stone tooling has carbide (victorious) solders, which cope well with hard and durable building materials.

Chiseling mode

The hammer drill can work as a jackhammer. that is, in chiseling mode without rotating the chuck. To do this, you need to switch the toggle switch to the position indicated by the icon with the hammer, and fix the nozzle in the form of a chisel or a lance in the chuck. In this mode, the tool can be used to dismantle brickwork, widen openings or knock tiles off walls and floors.

Impact drilling mode

The hammer hammer mechanism allows you to quickly and efficiently drill holes in concrete, brick or stone. Impact mode cannot be used when drilling metal or ceramics.

During hammer drilling, hold the hammer drill strictly perpendicular to the surface. Do not skew, as this can damage the tool and equipment.

Rotary hammer maintenance

In addition to information on how to operate a hammer drill, you need to know how to maintain it. This tool is designed for heavy loads and intensive use. It must work in difficult conditions, so the design of the rock drill is as reliable as possible. But it contains units and parts that require periodic attention and timely maintenance.


A tool with an impact force of more than 8 J and a weight of at least 8 kg, designed for continuous long-term operation.

Mainly used by construction crews.

The best models will cost at least 20 thousand.

By purpose, the tool can be divided into:


To choose the right tool for the job, think about the size and number of holes you need to drill. The more work you have to do, the more powerful apparatus you need.

There is also a difference in the level of use of the puncher.

  • For intensive and long-term, professional work, the brands are intended: Bosch PROFESSIONAL, DeWALT, HITACHI, Makita, Metabo.
  • For not frequent, amateur use, brands such as: BLACKDECKER, Bosch DIY, GREENWORKS, PATRIOT, STANLEY, Interskol are suitable.

Rotary hammer bits

Perforator nozzles are distinguished by their purpose and the method of attachment in the chuck.

By purpose, the attachments are divided into tools for:

  • drilling (drills);
  • drilling (drills, bits);
  • chiselling (chisels, peaks).

Types of perforators and their price

Auger drills

In the efficiency of auger drills, the angle of inclination of the working groove plays a role. Such drills are used to make holes of great depth, they provide effective dust extraction and are designed for intensive work. The greater the angle of inclination of the groove, the greater the drilling speed and work productivity. The use of drills with a centering spike is effective, they hold the direction of drilling more evenly and reduce the stress on hands and tools.

Mixer attachment

Also, the perforator can be used as a mixer for the preparation of building mixes. To do this, you need a mixer attachment.

Engine and power

The shape of the rotary hammer body primarily depends on the location of its engine:

  • Straight models are usually a light tool (with rare exceptions), resembling an ordinary drill in appearance. These rock drills are compact and better suited to work in confined spaces. The engine is located horizontally here, due to which there is an increased load. In addition, the motor is less efficiently cooled.
  • L-Shaped. Heavy to mid-range tools where the vertically mounted motor receives effective cooling and vibration reduction. Such models have an increased impact force due to the use of a crank mechanism, which resulted in an increased amplitude of vibrations of the striker.

Electric hammer drills are usually equipped with collector motors.

The more powerful they are, the larger they are, and, consequently, the larger and more massive the instrument itself, from which it can be conditionally divided into:

  • Lightweight: 0.4. 0.8 kW, weighing up to 4 kg.
  • Medium: power up to 1 kW, weight up to 8 kg.
  • Heavy: up to 2 kW, weighing over 8 kg.


For perforating operations in the well due to the cumulative effect.

The device is designed to pierce channels by means of a cumulative jet formed by an explosion of a charge.