The best hammer drill for the home. Engine location: horizontal and vertical

Choosing the right drilling tool means making it easier repair work around the house for a long time. How to successfully choose a puncher so as not to overpay for the brand and get high-quality equipment?

A few decades ago, only powerful electric drills equipped with drills for metal and concrete were used in everyday life. A truly branded, specialized tool was sold only abroad, it was impossible to just go to a hardware supermarket and choose the right device.

Everything is changing, and the shortage of goods for the population has turned into retail associated with trade and competition. Now there is no problem with availability, but there are snags with the selection of the right tool model, the choice of an honest manufacturer.

What is the difference between a drill and a hammer drill and vice versa

The perforator is characterized by a longitudinal axial movement of the working part, similar to an impact drill. Therefore, hammer drills are confused with a heavy drill. In words, there is practically no difference, however, the hammer operates on the basis of pneumatics, and any impact (heavy) drill works thanks to mechanics.

Hence the difference in the speed of surface treatment. Drilling holes in concrete, masonry and stone walls pneumatically reduces the physical burden on the user. For any impact drill similar work associated with great fatigue, and the “impact drilling” mode wears out the internal components of the drill very quickly.

We come to the conclusion that the hammer drill should be larger and more massive than a drill with a percussion function.

The device and characteristics of the perforator

All perforators are divided into three types according to their functionality:

1. Single mode. Hammer drilling function only. Most often, such punchers are not used in everyday life, but are used as a professional optional equipment narrow purpose.
2. Dual mode. Impact drilling plus classic drilling or chiselling mode.
3. Tri-mode. The tool is equipped with all the functions indicated in paragraphs 1 and 2.

The choice of a rotary hammer is based, first of all, on the characteristics of power and impact force. The higher these indicators, the better the selected perforator.

The impact force of the tool is sometimes not proportional to the power due to design features.

Types of working cartridge for puncher:

• normal;
• quick-clamping.

Which punch chuck to choose? For housework or chores, the quick-release model without keys is best suited. Changing the nozzle in this version is convenient, easy and fast.

Classification of perforators by weight:

1. Lungs. Up to 4 kilograms. Power not more than 700 watts. They only have an SDS-plus chuck for a drill no larger than 26 mm.
2. Medium. From 4 to 8 kilograms. Power from 700 to 1500 watts. Depending on the configuration, both SDS-plus and SDS-max are available.
3. Heavy. Over 8 kilograms. Power over 1500 watts. Equipped only with an SDS-max chuck for diameters up to 60 mm.

The manufacturer equips the latest models of its rotary hammers with SDS-top chucks for diameters from 16 to 25 mm.

Energy and frequency of impacts

For a hammer drill, the impact function, measured in joules, is very important. The impact energy depends on the performance of the device, as well as the diameter of the hole being machined. For daily work with a hammer drill, this is one of the most important indicators.

It is essential that the impact drill at the “maximum” will very quickly run out of its resource, and the hammer drill performs this work for a long time without wear, especially with a single-mode model.

The frequency of impacts also affects the speed of the tool. The more often the punch piston hits the working element, the faster the hole breaks through.

It turns out that energy and frequency determine the level of performance. At self-selection perforator, you need to evaluate the amount of work on chiselling, then calculate the approximate performance using the specified characteristics of the impact frequency.

How to choose a hammer drill for home

It is best to start the selection, starting from weight and power. Super-productive models for the home are definitely not needed.

Hammer drills for home use are mid-range tools in terms of cost, power and weight.

Suitable criteria for home conditions and the following brands:

1. Power from 600 to 900 watts.
2. Impact from 1.2 to 2.2 J.
3. Three-mode medium perforator. Drilling, drilling with impact, impact without rotation.
4. The rotational speed must be regulated.
5. Anti-jamming clutch.
6. Quick release chuck.
7. Replaceable branded cartridge included.

According to these characteristics, three leading brands are distinguished:

It is not necessary to trust a consultant in the selection of a perforator, or any other technique. The maximum is to listen to recommendations. You need to choose and buy a model that best suits your personal requirements.

The puncher makes holes in concrete and stone, it can be used as a chipper for chipping tiles, chasing channels for wiring and dismantling. It is designed for heavy loads and is able to work with especially durable materials.

Power and impact energy

The impact force and the speed of work depend on the power of the perforator. For example, an 850 W puncher has an impact energy of 3.2 J, it can work with brick and soft concrete. Such a tool belongs to the light class (its weight is only 3 - 4 kg), they can make small holes with a diameter of up to 20 mm, for example, when installing fasteners in walls, mounting suspended ceilings or drywall partitions. A 1500 W perforator with an impact energy of 18 - 20 J weighs over 10 kg and belongs to professional tools - it is able to break very hard materials - stone and concrete. This tool is designed for knocking out large holes, for example, for sockets, and is also used for dismantling, chasing channels or chipping tiles.
The larger the drilling diameter, the harder the punch should hammer. Powerful tools break material with high impact force at low impact frequency. In low-power perforators, on the contrary, the impact force is small, but the impact frequency is high.

Drill attachment type

SDS-Plus is the most common chuck type for light grade rock drills. They are suitable for drills with a shank with a diameter of 10 mm and four grooves. The shank is inserted into the cartridge and fixed with a slot. To remove the snap, you need to turn the ring. Used for drilling with a solid drill with a diameter of up to 40 mm.

Tools with an SDS-Max chuck are in the heavy class. They have their own equipment - drills with a shank diameter of 18 mm and five grooves. These are professional models, they are used for drilling with a solid drill with a diameter of up to 90 mm.

SDS-Top is a not too common type of chuck developed by Bosch to increase the drilling diameter of the SDS-Plus rotary hammer. A 14 mm shank fits into a 70 mm chuck and has two closed and two open slots. The drilling diameter with a solid drill reaches 70 mm.

SDS-Quick - this type is presented mainly in the household segment. Bits with a hex shank are inserted into the chuck. The standard developed by Bosch allows you to work with equipment in impact mode and in drilling mode. This is universal option for homework.

HEX - tools with a hex-type chuck, which is rarely found in rotary hammers. It is mainly installed on jackhammers. Such models are designed for the use of drills with a hex shank, they withstand heavy loads and are used for professional work.

Today we decided to move a little away from the topic of construction and touch on the topic of tools, without which any construction and repair is impossible. One of the most necessary tools in construction and repair is a perforator. Yes, this is something that no repair can do without, and that often wakes us up in the mornings on weekends.

A hammer drill is a device that is used to drill holes in various materials. Perforators, as a rule, work in three modes:

• drilling;


• chiselling;


• Combined option.

How to choose a hammer drill for home

Let's try to consider below what criteria you need to pay attention to when choosing a perforator.

Hammer power

The power of a perforator is one of its most important indicators. Based on the power, you can calculate the amount of energy it consumes, and most importantly, power determines the strength and speed of the punch. The more power the puncher has, the wider its capabilities. A powerful puncher makes holes faster, and can also make them in more difficult materials.

Drill attachment type

Due to the specifics of their purpose, hammer drills have a special, stronger type of drill attachment, which differs from the one in the drill. The rotary hammers use an SDS standard chuck. Thanks to this system, the drill is securely fixed, which prevents it from turning, it is worth noting that inserting and pulling out the drills is quite simple. To date, the most common types of cartridges are SDS-Plus and SDS-Max.

Number of operating speeds

Most simple rotary hammers have one position of work, but there are more expensive models that have several speeds. Usually, modern models rotary hammers can have two or five speeds. Due to the presence of speed control, you can adjust the speed of rotation and impact of the punch. This is very good if you need a high speed for working with difficult materials, or a low speed for accurate and accurate drilling.

Idle speed

This parameter measures how many revolutions per minute the drill makes idle, without load. The maximum idle speed in modern rock drills varies from 225 to 5000 revolutions per minute. How more number revolutions, the greater the productivity of the perforator.

Number of beats per minute

The puncher is also equipped with a percussion mechanism. How more quantity blows, the faster you can make a hole, or the puncher will be able to use harder materials. The maximum number of strokes per minute at idle is from 200 to 7500 per minute.

impact energy

Do not confuse the impact force of the punch with the number of beats per minute. The number of hits and their strength are two completely different indicators. How hit harder, the more complex work and materials he will be able to hammer. The impact energy index in perforators ranges from 0.23 to 30 J. The optimal impact force in a home perforator is from 1.5 to 3 J. This power is quite enough for home walls and for short work.

Keep in mind that the stronger the impact energy, the less effort you will need to apply when drilling concrete walls.

Max Torque

The more torque, the more difficult the load will be handled by your rotary hammer. This parameter for modern perforators ranges from 3 to 200 N * m.

Maximum drilling diameter

As you know, the larger the diameter of the drill, the greater the load on the punch. For each material, the perforator has its own diameter value. The diameter is calculated for the following materials:

• Wood;


• Brick;


• Metal;


• A rock;


• Concrete.

Network cable length

Most perforators have a cable, the length of which is from 2 to 6 meters. Accordingly, the longer the cable, the easier it will be for you to get to the required place where you need to use a puncher. If the cable is short, then if you need to work at a far distance from the outlet, then you will constantly have to use an extension cord, which, you see, is inconvenient. Therefore, we recommend taking this factor into account and choosing a puncher with a cable length of at least 3 meters.

Equipment

When we have decided which is better to buy a puncher, let's look at what is included with the puncher.

case

Be sure to buy a punch that comes in a case. Thanks to the case, you can easily transport your rotary hammer, and it is also very convenient to store it in the case. In addition, most cases are equipped with special compartments where you can put a set of drills, drills and other related items.

Keyless chuck

With the keyless chuck, you can easily clamp the drill without using a clamping key.

Additional set of brushes

When using a perforator, the brushes wear out quickly. Therefore, a spare set that comes with them will be very useful, and you will not have to waste money on their purchase again. Please note that untimely replacement of brushes can lead to damage to the punch.

Lubricant packaging

Sometimes a small jar of lubricant, most often Vaseline, is included with the puncher. It is used not only to lubricate the perforator mechanism, but also to lubricate the drills themselves in order to reduce friction inside the cartridge and prevent it from jamming.

dust collector

As you know, when working with a perforator, it forms a large number of dust. If a dust bag is supplied with the puncher, then all the dust generated by drilling will fall into this dust collector, which is very convenient.

Perforator firm

To date, the most popular firms producing perforators are the following firms:

• einhell;


• Bosch;



• Storm;


• craft.

Which hammer drill is better to buy for home

Bosch GBH 2-26 DFR

If you can't live without repairs and love it, then this hammer drill model is what you need. GBH 2-26 DFR has good performance that will cope with any household task. It is worth noting the presence of reverse, electronic speed control and safety clutch. The quality of the product is guaranteed, as it is made in Germany, and Bosch itself is a leader in its industry.

As for the reviews, most users note the power of this hammer drill, comparing drilling concrete walls with piercing foam.

Price: 10 thousand rubles.

Einhell BRH 1500

A cheaper analogue is this model perforator firm Einhell. If you need a puncher as a "workhorse", for a rare home use, then this option will come in handy for you. Einhell BRH 1500 combines all the necessary features, and optimal performance which are great for drilling and drilling home walls.

According to reviews, this punch harmoniously combines price and quality.

Price: 4 thousand rubles.

That, in principle, is all that we wanted to tell you about which is better to choose a hammer drill for your home.

The need to choose a reliable hammer drill for the home can arise in many cases. Such a useful power tool will become indispensable assistant for cosmetic and overhaul apartment, installation of a cornice or boiler, as well as other tasks. For professional builders, a hammer drill is one of the key assistants in their work. However, in this case, the tool will be used much more often and in a wider range of tasks, which requires increased reliability, increased power and extended functionality. Choose optimal device our rating will help you best models perforators in which we presented a wide variety of options for any requirements and financial possibilities.

Best Inexpensive Hammer Drills for Home

When it comes to which hammer drill is best to buy for personal use, it is simply pointless to consider expensive models. It is unlikely that you will need to constantly dismantle brick walls or often drill holes in them. This means that you do not need to buy professional models, since even half of their capabilities and power will not be used by you. In turn, reliability budget decisions is at a level sufficient for the average consumer, and you can fully count on 5-6 years of trouble-free operation of the rotary hammer at an affordable price.

1. Interskol P-22/620ER

Opens our TOP popular perforator for home use from Interskol. The P-22/620ER model has everything you need for the average user, including the SDS + cartridge. The device can work in two modes: conventional drilling and hammer drilling. At idle, the Interskol puncher can produce up to 1100 rpm. The impact force of the device is 2.2 J at a frequency of 5060 beats. The maximum concrete drilling diameter for the P-22/620ER model is 22 ml, and the power consumed by the device is 620 W.

Advantages:

• the presence of a brush reverse;
• light weight;
• length of the network cable;
• build quality and materials.

Disadvantages:

• small storage case;
• there is no chiseling mode.

2. ZUBR ZP-28-800 KM

Inexpensive but good puncher ZUBR ZP-28-800 KM is the most expensive model in the TOP-3 devices for home use. However, given the cost of 5000 rubles, it offers really great features. With a power consumption of 800 W, the device produces 4800 beats per minute with a force of 3.2 J and a rotation speed of 1200 rpm. The presence of a metal gearbox protects the tool from overheating. The maximum possible drilling diameter for wood, metal and concrete is 30, 13 and 28 mm respectively. According to user reviews, the puncher fully justifies its price and even surpasses analogues that are 1.5-2 times more expensive.

Advantages:

• excellent assembly;
• compactness and light weight;
• the presence of a quick-clamping chuck;
• good power reserve of the device;
• no heating during long-term operation.

Disadvantages:

• missing.

3. Storm! RH2592R

Next in line is the best hammer drill for the home in terms of price-quality ratio. In the RH2592P model from the Sturm brand! there are three modes of operation, reverse function, spindle lock, as well as excellent equipment. In addition to the power tool itself and a convenient case for storing it, the buyer receives an additional handle, a drilling depth limiter, as well as lubricant and a key chuck. It is also the best budget rotary hammer model in our rating in terms of power, which is 920 watts here. As for the maximum frequency of revolutions and strokes, they are respectively 1100 and 4400 per minute. Of the tangible shortcomings of the tool, only significant heating can be distinguished, therefore, to ensure a long service life of Sturm! RH2592P he needs to be allowed to rest after every 20-30 minutes of active work.

Advantages:

• functionality;
• device power;
• contents of delivery;
• good tool set.

Disadvantages:

• strong heating under prolonged load;
• short power cord;
• lack of anti-vibration system.

The best rotary hammers for quality and reliability

If you're looking for a good rotary hammer that delivers superior build quality and reliability, then you don't have to choose a model from the professional segment. Well-known manufacturers today offer good options for middle-class power tools (800 - 1200 W), even in the middle price segment, and their capabilities are enough for the average buyer even with a margin. In this category, we have also selected 3 of the most attractive devices from well-known brands that will be a great option to buy.

1. AEG KH 27 E

One of the best rotary hammers in terms of reliability can undoubtedly be called the KH 27 E model from the world famous brand AEG. The power of the device is 825 W, which provides 1500 rpm at idle and 4500 beats / min. The strength of the latter is 3 J, which can be called an excellent indicator for a device of this class. In reviews of the KH 27 E rotary hammer, low weight and a good delivery set are often noted as its advantages. The maximum allowable drilling diameter when using this model is 13, 26 and 30 millimeters for metal, concrete and wood, respectively.

Advantages:

• build quality;
• reliability in work;
• light weight;
• number of turns.

Disadvantages:

• not found during testing.

2. DeWALT D25144K

When choosing a manufacturer of a puncher, many buyers stop at the DeWALT brand. Products of this brand have proven themselves in different classes, including professional solutions. Model D25144K at a low price of 9000 rubles offers the consumer 900 watts of power with an idle speed of 1450 per minute. The puncher can function in 3 working modes, including slotting. He is able not only to punch holes, but also, when replacing the cartridge, turn into a drill driver. The device has an excellent impact force of 3.2 J, which is easily enough for chiselling durable concrete.

Advantages:

• high quality materials;
• frequency and force of blows;
• equipment and functionality;
• system of fast change of cartridges;
• best value for money performance.

Disadvantages:

• not found during testing.

3. Makita HR2470

Makita rotary hammers are among the best on the market today. The quality of the products of this Japanese company surpasses most competitors, although the cost of a power tool from a famous manufacturer is at a very affordable level. The HR2470 model, equipped with a 780 W motor, was no exception. The capabilities of this solution from Makita are very impressive: three operating modes, drilling diameter up to 24 millimeters (for concrete), frequency and force of impacts 4500 per minute and 2.4 J, respectively. The HR2470 is a high-quality and versatile rotary hammer with a good package and a 4-meter cable, which allows you to work with it on large area. At the same time, the weight of the device is only 2.6 kg, which means that the load on the hands when using it will be low.

Advantages:

• network cable length;
• high build quality and reliability;
• sits comfortably in the hand;
• drill jamming protection;
• good dust protection.

Disadvantages:

• not found.

When choosing a manufacturer of punchers, remember that with the same functionality of models from different companies, a tool from a more well-known brand can cost an order of magnitude more expensive. The main parameters that you should pay attention to when choosing a tool are power, impact energy, ease of use and reliability. For a tool used in everyday life, it is recommended to choose a hammer drill with at least three operating modes. And, as a rule, it is worth paying attention to the presence of a protective clutch and adjusting the speed of rotation of the shaft.

The best cordless rotary hammers

Very often, the mobility of the tools they purchase is important to buyers. This is understandable, because it is not always possible to connect to a power source, and when performing work in different rooms and you don’t want to constantly carry a huge cable with you, connecting it to different sockets. Great solution in this case, it will be the purchase of a convenient and lightweight battery-powered puncher. Their capabilities, power and autonomy will be enough to perform most of the work required by an ordinary user. At the same time, the price of such devices does not go beyond reasonable limits.

1. Makita DHR242Z

One of the best cordless rotary hammers not only on our list, but also on the market is the DHR242Z model from the Makita brand. It is equipped with electronic speed control and an excellent anti-vibration system, and the maximum frequency and impact force when operating in the appropriate modes is 4700 and 2.0 J. However, the number of idle revolutions is not too high here - only 950 per minute. This is the lowest indicator in the ranking, and you need to pay attention to this nuance before buying. In order not to interrupt the process of the hammer drill, it is recommended to buy two batteries - the operating time with one is just enough to charge the second. Otherwise, this is an excellent choice for those who need excellent quality, maximum mobility and good autonomy.

Advantages:

• fast battery charging - up to 100% in 25 minutes;
• the presence of an innovative brushless motor;
• smooth start;
• electronic rotation control.

Disadvantages:

• rotational speed;
• You need to purchase the charger and batteries separately.

2. AEG BBH 18 Li-0

AEG rotary hammers are considered one of the best on the market, so when choosing a battery device, you can safely look towards this manufacturer. The BBH 18 Li-0 model has three modes of operation and a good package. Among the pleasant features of the device, one can note the anti-vibration system, which significantly increases the usability. The maximum rotation speed of this rotary hammer is 1400 rpm at idle, and the impact frequency is 4200 beats/min (maximum energy 2.3 J). The device weighs 3500 grams, which is a bit much for some users. But for this class of devices, this feature is not a disadvantage. It is worth noting that the battery capacity is the same as that of the Makita 4 Ah, but due to the high power consumption, it sits down much faster.

Advantages:

• good performance;
• anti-vibration system;
• balanced design;
• battery overload protection function.

Disadvantages:

• impressive weight.

3. Bosch GBH 18 V-EC 0

Cordless rotary hammers from Bosch are a combination of reasonable cost, excellent quality and excellent functionality. The GBH 18 V-EC 0 model has everything that not only an ordinary user, but even a professional builder needs: 1400 rpm and 4550 beats per minute, three operating modes, good equipment, as well as reverse and spindle lock. In addition, we can also note the electronic speed control and electronic overload protection of the device, which guarantees a long service life. If necessary, the hammer can be used as a drill, due to which its functionality is greatly expanded.

Advantages:

• overload protection
• electronic speed control
• extended battery life
• a light weight
• excellent build quality
• built-in LED lighting

Disadvantages:

• not found

The best professional rotary hammers

For those who are engaged in construction or repair at a professional level, conventional models simply will not work. Due to the increased load, such a power tool can quickly become unusable, and its capabilities are much less extensive. Specialists, on the other hand, need perforators for working at height or a stepladder, capable of drilling large holes without problems, and massive concrete wall destroy. As in other cases, we bring to your attention the top three leaders in this segment, which are distinguished by perfectly balanced characteristics, reliability and price tag.

1. Makita HR5001C

Makita HR5001C is one of the most powerful rotary hammers in the ranking. It delivers 17.5 J of impact energy and delivers up to 2150 beats per minute. It has two modes (drilling with impact and chiselling), SDS-max drill attachment, six steps for setting the number and strength of impacts, and a smooth descent. Such indicators are enough to destroy even strong walls or a strong concrete floor. The weight of the perforator is an impressive 10.8 kilograms, but for this class of equipment this is a completely justified parameter. Among the minuses of the HR5001C model, only the high cost of spare parts can be noted, but their quality is at an excellent level.

Advantages:

• quality of materials and assembly;
• lack of heating during prolonged loads;
• high level of protection;
• functionality;
• brush wear monitoring system.

Disadvantages:

• high price of components;
• impressive weight and size.

2. DeWALT D25762K

An excellent option for a professional device is the DeWALT D25762K. With a high impact energy of 18 joules and a frequency of 2300 strokes per minute, this rotary hammer easily cuts through concrete and other hard materials. Among the key features of the device are an anti-vibration system, an indication of the degree of wear of the carbon brushes, as well as electronic speed control. Maximum drilling diameter in concrete standard mode and drill mode is 52 and 80 millimeters, respectively. Complete with the device, the user will be able to find an additional handle and a package of lubricant. All these features make DeWALT D25762K the best professional rotary hammer in the rating category presented.

Advantages:

• active vibration protection using AVC technology;
• high impact energy;
• drilling diameter;
• brush wear warning;
• reliability in work.

Disadvantages:

• high price.

3. Bosch GBH 8-45 DV

The Bosch GBH 8-45 DV is one of the best network punchers in the ranking and also the lightest in its class. The power of this device is 1.5 kW, and its weight is 8.9 kg. The GBH 8-45 DV comes with a pack of grease and an additional handle. This is a perforator with a small impact power relative to others. professional models in our ranking. The indicated parameter here is only 12.5 J, but thanks to the Turbo Power function, it is not inferior in performance to previous models. The impact energy is enough for most tasks, especially considering the frequency of impacts in 2760 per minute.

Advantages:

• long service life;
• 3-stage vibration damping system;
• power of 1.5 kW;
• relatively small weight;
• convenient location of buttons and switches.

Disadvantages:

• there are no special complaints about the work.

Which perforator is better to buy?

The rating above the best punchers, which are reliable for home and professional work will help you decide the best choice. The power tools considered in our rating are of excellent quality and excellent functionality. Among them you can choose inexpensive budget models, professional rock drills, and cordless devices for maximum portability and convenience.

Drill a dozen holes for the dowel in concrete slab? Yes it can be done impact drill- having spent a lot of effort, time and not forgetting to constantly cool the drill. Or you can take a puncher and spend three minutes on everything about everything.

And if you need not a dozen holes, but more; it is required to draw a groove along the wall (a groove for hidden cable laying) or install a socket box in the wall - you can’t do without a puncher.

Perforator device

Why, with similar power, is a hammer drill incomparably more productive than a drill when drilling concrete? The reason lies in the design of the percussion mechanism.

Two types of percussion mechanisms are used in perforators, but both of them have one main difference from the percussion mechanism of a drill: they have a massive striker that periodically strikes the cartridge. Therefore, when drilling with a hammer drill, it is not necessary to attach to the tool special efforts. On the contrary, if the punch is not pressed hard, drilling is even more efficient, because the chuck stroke is longer.

The pneumatic impact mechanism is used on powerful rotary hammers, usually with a vertical engine. However, on some models with a pneumatic mechanism, the engine is located horizontally.

The mechanism allows you to create a large amplitude of piston movement, which increases the impact force.

The oscillating bearing mechanism is used in compact rotary hammers with a horizontal motor. The device of the mechanism is simpler, it is cheaper, but the amplitude of piston movements is limited, and the impact is weaker. But the swinging bearing is able to provide a high (up to 7500 beats / min) frequency of impacts.

In most drills, the impact mechanism is implemented using a pair of ratchet gears. In this case, the tool itself serves as a striker, so the stronger the drill is pressed against the concrete, the more powerful the blow and the higher the performance. But similar characteristics of the perforator will still be many times higher.

Characteristics of perforators

Maximum impact energy- the main characteristic of perforators, which determines its capabilities and performance. The greater the impact energy, the larger the drill or bit can be used and the faster the chiselling will occur.

For home use - drilling holes for dowels and anchor bolts - a light, low-power hammer drill with an impact energy of 1-2 J will suffice.

If the puncher is planned to be used for chiselling and installing socket boxes, more impact energy will be required: 2.5 - 3.5 J.

For drilling through holes of large length and diameter; for cutting passages brick walls you will need a fairly powerful tool with an impact force of 4-10 J.

The maximum impact force of 10-30 J is required when dismantling walls and making passages in load-bearing concrete walls.

After selection necessary strength impact, attention should be paid to power- it must correspond to the impact energy:

- for a maximum impact energy of 1.5 J optimal power will be 600 watts;
- 2-2.5 J - 700-800 W;
- 3.5 J - 900 W
- 5-15 J - 1200-1500 W
- from 10 J - 1500 W and above

If the power is much lower than optimal, this does not mean that the manufacturer is trying to mislead you, and the impact force is too high. Slow-speed rotary hammers with pneumatic impact mechanism can have high impact force with relatively low power. The capabilities of such punchers will be the same as those of more powerful ones, but the performance will be lower.

Performance is also affected by the frequency of strokes. The more maximum number of hits per minute, the faster the hole will be drilled. High impact frequency (3500-7500 beats/min) allows low power perforators with low impact force to have acceptable performance. Conversely, perforators with high impact force high frequency not needed, they give out 2000-3500 beats / min.

Drill attachment type(cartridge). The most common options are SDS-Max and SDS-Plus.

patronom SDS Plus equipped with most rotary hammers of small and medium power. The shank diameter of the SDS-Plus tool is 10 mm, which is sufficient for drills up to 30 mm in diameter, chisels for chiselling and hole saws.

Cartridge SDS Max designed for a shank with a diameter of 18 mm, powerful rotary hammers are equipped with such a cartridge. Large diameter long drills, demolition bits and large diameter core bits have an SDS-Max shank.

Cartridge SDS Quick used only in compact bosch rotary hammers. The tool shank has a diameter of 8 mm, the maximum diameter of concrete drills with such a shank is 10 mm.

Operating modes.

In mode chiselling the cartridge performs only reciprocating movements. The presence of this mode is necessary for chiseling and cutting holes with a flat chisel. drilling, especially deep holes, in this mode is not recommended, it will most likely lead to jamming of the drill.

Mode impact drilling used for drilling holes in concrete, porcelain stoneware, cast and natural stone. For household hammers, this is the most popular mode.

Mode drilling(without impact) may be required for making holes in brick, cinder block or aerated concrete - in similar materials hammer drilling can break the hole. The presence of this mode on a tool with a replaceable cartridge allows you to replace the cartridge with a cam cartridge and use the hammer drill as a drill.

The use of an adapter from SDS to a cam chuck for the same purpose is hardly justified - the SDS connection allows significant play, the adapter with the drill will hang out, good quality drilling cannot be achieved. Therefore, if you intend to use a rotary hammer as a drill, you should choose a tool with a quick-change chuck system and an additional quick-change chuck in the kit.

Some models are equipped with a screwdriver mode - it is similar to the drilling mode, but with a low rotational speed of the chuck. In this mode, you can tighten large diameter screws. But the hammers are not supplied with a reverse and a disengaging clutch (ratchet), so a full-fledged screwdriver will not work. The weight and dimensions of the perforator also do not contribute to its use.

Some models have a Vario-Lock position on the mode switch - in this position of the switch, by turning the chuck manually, you can set the desired position of the bit for subsequent work in chiseling mode.

Device power. The rotary hammer motor consumes high current, so for a long time, rotary hammers remained exclusively a 220 V mains-powered tool. But the development of technology and the creation of batteries capable of delivering a high discharge current for a long time made it possible to start producing cordless rotary hammers. Despite the heavy weight high price and low impact energy, such a tool immediately gained high popularity - because in the absence of power supply it is much easier to use a cordless hammer drill than to carry it with you gasoline generator. Unfortunately, the duration of the operation of rotary hammers from one battery is still low - 1-1.5 hours with optimal load. As the load increases, the operating time can be reduced several times.

Maximum idle speed practically does not affect the speed of concrete drilling in the modes of chiselling and drilling with impact. You should pay attention to this parameter if the hammer drill is supposed to be used as a drill - for confident drilling of metals, you need a large number of idle speeds (from 1200 and above).

Maximum drilling diameter. For ease of choice, many manufacturers give the maximum drilling diameters for wood, metal and concrete. But the drilling depth is not indicated, so these characteristics should be used with caution. For example, some 700-watt rotary hammers have a maximum concrete drilling diameter of 30mm. Yes, it will be possible to drill a hole several centimeters deep with such a 30 mm puncher, but you should not expect to make a through hole in a concrete wall.

Functions reverse allows you to change the direction of rotation of the cartridge and can be very useful when the drill jams. In addition, the use of reverse significantly facilitates the extraction of long drills from the holes. In the screwdriver mode, the presence of a reverse will increase the practicality of the tool and will allow not only to tighten the screws, but also to unscrew them.

Safety clutch prevents the tool from jerking when the drill or bit is jammed. The option is especially important for powerful rotary hammers - in the case of a wedge in the hammer drilling mode without a safety clutch, such a tool is simply impossible to hold in your hands.