How to choose a hammer drill for work and home

Battery models

Very often, many craftsmen simply do not have the ability to connect their equipment to the power line. In this case, the cordless versions of DeWalt rotary hammers come to the rescue. They are distinguished by sufficient drilling power and long-term operation without electricity. Consider the highest quality tools in this category of rotary hammers.

DeWalt DCH133N

The device is deservedly recognized as the lightest and most durable in its class.

It is perfect for use in places far from electricity. The manufacturer did a good job on performance. As a result, the heating of the punch will be minimal.

Thanks to the arched holder, the device fits perfectly in the hand. The additional handle is removable and facilitates the work process. The hammer drill weighs about 2700 grams. Therefore, with simple drilling, you can safely work with it even with one hand.

Let's consider the positive aspects of the model.

The device is equipped with a depth gauge, thanks to which you will always control the set drilling depth.
The additional holder has a rubberized insert that allows the device to lie securely in the hand.
If desired, the rotary hammer can be adjusted so that the minimum amount of dust is emitted during operation

This can be very important when working in residential areas.
With a 6mm drill, you can drill about 90 holes. And this is with one full recharge of the battery.
The battery capacity is 5 A * h

It will take no more than an hour to fully recharge.

• Due to its low weight and small dimensions, the device will be especially useful if you need to work at height.
• Comfortable grip. It is manufactured specifically for this line of rock drills by Stanley.
• The device operates in three modes.
• Each blow is made with a force of 2.6 J. The device can make up to 91 blows per second.
• Reverse function. The switch is not too low.
• The device allows you to drill holes up to 5 cm even in brick.
• The axle spins at 1500 rpm.
• The hammer drill can handle even the toughest metal surfaces. For example, you can drill a 15mm hole in an iron sheet.
• Installed cartridge type SDS-Plus. It allows the drill to be replaced effortlessly.

But there are also downsides.

• High price: about $ 160.
• The puncher vibrates strongly, which is a disadvantage if you plan to work with the device for a very long time.
• There is no special case for transportation included with the device. This is a very strange decision, as cordless drills are designed to be carried around all the time.
• The device is quite light, and the battery is quite heavy. Therefore, there is a preponderance towards the holder. This is especially noticeable when drilling horizontally.

DeWalt DCH333NT

In this device, a lot of power is concentrated in a small package.

This solution is perfect for work where a conventional rotary hammer simply cannot fit. The manufacturer installed a vertical slider, due to which the device was greatly reduced in length.

The rotary hammer is convenient to use even with one hand. There is a clip on the edge with which you can fasten the device to the belt. Unlike the model described above, this device is capable of absorbing vibration.

The positives include several characteristics.

• Almost the entire body is rubberized. Consequently, the device is quite robust and shockproof.
• The device operates in three modes.
• The cartridge has a special ring, thanks to which it has become much easier to change the equipment.
• Ergonomic handle.
• Installed one of the most powerful batteries for 54 V. The impact force is 3.4 J, and the speed - 74 impacts per second.

• The device is capable of drilling a hole with a diameter of 2.8 cm in concrete.
• The device is equipped with a depth gauge.
• The device makes 16 rotations per second.
• LED lights.
• Impact resistant material.

Negative sides:

• price $ 450;
• at this price, there is no battery or charger included;
• you will not be able to adjust the RPM;
• very expensive batteries;
• the punch is fully charged in 3 hours;
• under heavy load, the appliance starts to creak.

Choice

When choosing a construction tool from Metabo, you should be extremely careful, as the convenience and efficiency of its use depends on it. The company offers a wide range of rotary hammers that differ in drilling modes and other characteristics. Depending on their weight, these devices can be divided into heavy, medium and light.

Impact energy

One of the important parameters, which must be paid attention to, is the impact energy, which is measured in joules. Simple Metabo models have impact force of less than 2 joules, while more powerful versions are capable of impacting up to 15 joules.

The hole diameter depends on the force of the impact. If you choose Metabo devices that have a minimum impact force, then the hole size will be appropriate. In addition, this indicator affects the ability of the construction tool to cope with various types of surfaces.

Most amateurs and novice craftsmen believe that the impact energy depends on how much pressure is applied to the hammer handle. However, when working with such a device, things are a little different. It is better to refuse models that have an impact force of 10 or more joules. The fact is that such a construction tool wears out quickly. Indeed, under heavy loads, the mechanisms experience tremendous pressure.

Impact speed

One of the important indicators on which the speed of work and their effectiveness depends is the frequency of blows. It indicates how many times the piston hits the surface in one minute.

Impact energy and its frequency are an indicator of the performance of Metabo rock drills, therefore close attention should be paid to this characteristic. A distinctive feature of the Metabo company is that it manages to achieve high quality of both indicators

Power

It should be noted that rock drills are less powerful equipment than drills. This is because drilling is much more difficult than drilling. This must be taken into account when choosing a hammer drill from Metabo. Most experts point out that devices that consume from 400 to 800 watts are considered the most optimal. This is quite enough for standard work. In any case, in the process of choosing a hammer drill from Metabo, you do not need to focus on power, since this indicator is not important.

About the brand

The Hilti company was founded back in 1941 in Liechtenstein thanks to the efforts of two brothers - Eugen and Martin Hilti. They started their own small business providing repair and body parts manufacturing services for cars. The company was initially small, with only five people working in the workshop. But over time, the specifics of production have changed. In the post-war period, there was an urgent need for a tool for the restoration of various buildings. It was during this period that the brothers decided to change the production profile and began to manufacture gasoline and electric motors, household appliances and various fasteners.

Today the Hilti brand offers a wide range of construction tools and fastening systems.The factories and branches of the company operate in different parts of the world. The total number of employees is already over 25 thousand people. Today, the Hilti brand is a reliable manufacturer of high-quality products that are in demand not only in Russia.

Construction machinery attracts attention and professionals who appreciate its high performance

Range

Today, Hilti is a manufacturer of various construction equipment, including rock drills.

The following varieties of this tool can be distinguished:

• rechargeable;
• network;
• combined.

TE 6-A36

This hammer drill is often chosen by professionals as it is the best in the battery-powered category.

The tool has a number of advantages:

• it is ideal for long-term drilling, when anchors are being installed, as it is characterized by increased power;
• the device is equipped with two 36 volt lithium-ion batteries, which charge quite quickly, therefore they are used even for industrial operation;
• thanks to the special AVR system, vibrations during use are significantly reduced, which guarantees efficient and comfortable work with the tool;
• simplicity of operation is also ensured by the low weight of the devices;
• thanks to the use of Hi-Drive technology, the tool is equipped with a new brushless motor, an uninterrupted supply of energy from the battery to the drill is carried out;
• the control system perfectly balances power surges.

The TE 6-A36 battery-powered tool is suitable for a variety of applications. Thanks to the dust extraction system, you can work with this tool even in rooms where cleanliness is paramount. Using a special nozzle, you can screw in screws.

The cost of the product is about 35,000 rubles. In addition to the hammer drill, the kit includes a charger, a battery, carbide drills and a suitcase. The weight of the tool is 4 kg, dimensions - 34.4 × 9.4 × 21.5 cm. It has several rotation speeds. The presence of an indicator allows you to always know how much the battery is charged. Working with this tool, you can drill with a diameter of 5 to 20 mm. The noise floor is only 99 dB.

TE 7-C

Among the network punchers, the powerful and productive Hilti TE 7-C device stands out, which can be bought for only 16,000 rubles. The main advantage of this model is the successful combination of high structural strength and well thought-out design. It is ideal for long-term work, while you can turn on the device to the maximum level.

The model is characterized by the presence of a comfortable handle in the shape of the letter D, which is a guarantor of safe work with this tool. The device can operate in several modes: drilling (with and without impact) and drilling. With the built-in depth gauge, you can accurately measure the depth. When you buy a rock drill, you get a detachable handle for lateral use, a depth stop and a carrying case.

The weight of the device is about 5 kilograms. The length of the network cable is 4 meters. The model allows you to make a hole with a diameter of 4-22 mm, working with aluminum, but for steel this figure is 13 mm. If you use a crown, then the hole can reach a diameter of 68 mm.

TE 70-ATC / AVR

This version of the Hilti combination rock drills is the most expensive in its class and also the most powerful and sought after by professionals. Its difference is the presence of a special SDS-Max cartridge. A single blow of the tool is 11.5 J. Thanks to the mechanical clutch, maximum torque transmission is ensured, and the unique technology allows the drill to stop almost instantly.

All body parts are made of special fiberglass reinforced plastic, which is a guarantor of reliability and long service life.

It is possible to replace the drill with the required diameter (from 12 to 150 mm), which allows you to work with various materials such as masonry, natural stone and concrete. The weight of the tool is 9.5 kg, dimensions - 54x12.5x32.4 cm. The device has a service indicator and a crushing function. The length of the mains cable is 4 meters, which makes it possible to work away from the mains.

Advantages

Electric options are very popular, which are designed not only for drilling, but also for chiselling holes in metal, brick, wood, etc. A distinctive feature of these devices is the presence of an advanced impact mechanism that makes it possible to work with solid building materials. Metabo rock drills have many advantages.

• The ability to control the speed, so you can work with different materials at a certain speed. This is what ensures the high quality of the final result, because you can choose the optimal speed indicators depending on the material being processed.
• Reverse function, which makes it possible to remove chisels and other parts without damaging the hole.
• The breakaway sleeve guarantees safety during the use of the unit. If a force majeure situation occurs, the engine is automatically shut off.
• The switch lock function makes it possible to work for a long time without straining your hands.

Gearbox replacement

Complete disassembly of the gearbox is a necessary procedure to diagnose problems with this assembly. After dismantling the plastic housing, removing the remnants of the old grease, you will have to disconnect the following parts:

• floating bearing;
• drive gear shaft;
• raster sleeve;
• sleeve with a piston.

The floating bearing is fixed in the aluminum housing with a metal bracket. It should be wrung out with a flat screwdriver. Then you need to take out the bearing and replace it if necessary. In the design of the floating bearing there is also a needle bearing, which is necessary for the rotation of the drive gear. He has to experience great overloads, and, as a result, he often breaks down. You can buy it either as a set or separately from the shaft.

An impact bolt is fixed in the grid sleeve by means of a metal impact ring. The ring is accessed through two side holes. A steel striker is located inside the bolt. It is advisable to replace the sealing rubber bushings, which are necessary for the tightness of the mechanism. In the process of replacing the parts of the striker, it is necessary to grease abundantly.

We use the puncher correctly

These few simple rules will help your lovingly chosen tool last a long time, avoiding annoying breakdowns.

So:

It is advisable to use only "native" cartridges, drills and lubricants, which are provided by the manufacturer. Maintenance, cleaning and lubrication are recommended regularly

Pay particular attention to the lubrication of the SDS shank of the tool for the job. Do not use the device for a long time without stopping.

It is necessary to periodically give him time to cool down. When drilling a deep hole, the work must be done in several stages, each time pulling out the drill and thereby cleaning the hole. This will happen by removing drilling waste. If you press on the tool, the impact mechanism will wear out prematurely. It is also fraught with overheating of the engine armature. Use the chiseling mode for a short time - stir it in a rotary mode, at least for 2 minutes. This will allow the device to cool down, and will also allow the lubricant to be evenly distributed in the right places. Thus, the forced lubrication system will work. In order not to break the chuck, it is necessary to work strictly perpendicular to the axis of the hole being punched, avoiding distortions of the tool. The dust cover and brushes of the electric motor should be periodically inspected, tidying up and replacing if necessary.Do not wait until a small malfunction turns into a major damage. It is better to immediately contact the service center - it will be much cheaper this way.

How does a puncher work

The perforator can be classified as a tool with a device of increased complexity. However, a consistent consideration of the details and the principle of operation will help a thorough understanding of the nuances of the mechanism and troubleshooting.

Barrel puncher device: 1 - power cord; 2 - carbon brushes; 3 - electric motor; 4 - switch; 5 - eccentric mechanism; 6 - impact mechanism; 7 - quick-change cartridge

In a drum rock drill, the motor and pinion are vertical. The key difference from the pistol-type tool here is the presence of an intermediate gear.

In horizontal (pistol) type perforators, there is no transfer gearbox as such, the rotation is immediately transmitted to the intermediate shaft located below the axis of the main spindle. This shaft is seated on two bearings, between them there is a "drunk bearing", which oscillates during rotation and drives the piston of the striker. There is a gear on the protruding front end of the shaft, due to which rotation is transmitted to the barrel.

Pistol-type perforator device: 1 - switch; 2 - electric motor; 3 - brushes; 4 - "drunk bearing"; 5 - "flying" piston; 6 - striker; 7 - SDS quick-release chuck

Any hammer drill has mode switches. In the barrel, they simply lift the gears of the transfer case, disengaging them. In a pistol gun, one of two control schemes can be used. In the simplest case, one switch displaces the intermediate shaft, which, being pushed as far forward as possible, meshes with the chuck gear, but at the same time the clutch for transferring rotation to the swing bearing is disengaged. In the middle position, both mechanisms are included in the transmission, and in the maximum recessed position, only the striker works. The outdated kinematic diagram has two switches, one of which disengages the rocking bearing clutch, and the other shifts the intermediate shaft.

Additional selection options

Many are interested in the question: "Which company to choose a puncher?" There is no definite answer to it. Be guided by

• the cost of the instrument;
• the presence of a service center in your city;
• compliance of the technical characteristics of the perforator with the conditions and specifics of the work.

Among the main brands, we will single out the brands Makita, Bosh, Dewalt, Black & Desker, KRESS, Metabo, Hitachi, AEG, Hilti, SKIL, and there are many others.

Additional characteristics should be considered, including the presence of:

• speed switch regulator;
• anti-vibration systems;
• depth gauge;
• reverse;
• soft descent;
• speed stabilization systems;
• dust protection;
• a clutch that protects against jamming of the drill;
• systems for changing the angle of the working plane.

And the last point is the tool kit. It differs significantly for different manufacturers and models. It is better to buy a complete puncher in a special plastic case. The kit may include:

• spare brushes;
• an adapter chuck that allows you to use drills from a hammer drill;
• a set of drills, chisels and drills;
• special tips and crowns.

Happy shopping!

Manufacturer assortment Kress

The best quality drills, hammer drills, screwdrivers, saws, grinders, jackhammers, jigsaws, as well as vacuum cleaners and garden equipment have brought the Kress brand worldwide recognition. Perfectly made Kress tools, thanks to official service centers, undergo a full warranty and post-warranty service, which allows them to operate for a long time, subjecting them to all kinds of checks and tests. Mass production of small-sized power units, development of a technological cycle for the manufacture of electric motors, battery chargers - made the brand widely known.Talented engineers and successful businessmen of the Kress company patented a fundamentally new automatic machine for winding the motor armature, which made it possible to increase the production capacity.

Kress products

In the fifties of the twentieth century, in Tübengin-Lustnau, a large industrial complex was built, producing electric motors for household appliances, which are installed on vacuum cleaners, washing machines, coffee grinders. In the sixties, the management of the Kress company decides to say goodbye to the role of a supplier of spare parts. The production of tools and equipment under its own brand begins. First came the stationary lathe, and then the first hand tool, the Kress drill. It was shown in 1964 in Cologne at the exhibition, and aroused great interest from visitors. During this period, there is an intensive filling of the market with Kress tools for drilling, grinding, sawing.

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In the seventies of the last century, working with the Kress screwdriver was accelerated by the x-mal-click quick clamping system. In the eighties, the Duo Kress electric saw was created, which embodied the advantages of band and circular saws. The full modulatory motor is launched into serial production. The total number of products manufactured annually is over half a million units. The company's dealer network began to develop especially strongly in the nineties. The sales volume is growing rapidly, an interesting novelty appears - the Kress hammer drill, which weighs only two kilograms. The popular 900 MPS sander can handle any type of surface. The battery saw and the 132 KAR pneumatic gun deserved close attention of consumers.

Since 1997, two main directions began to stand out in the production cycle, which led to the creation of corresponding technological lines, which are still relevant today. The Kress firm produces not only expensive professional tools and equipment, but also simpler high-quality analogs. In 2002, the official representative office of the brand was opened in Russia, which made it more accessible to purchase goods manufactured at factories in Germany and Switzerland.

Popular models rating

The table lists the important characteristics of popular rock drills and gives a brief assessment of these models.

Table: the best rotary hammers for home use