What should be a hammer drill for a power house
3.Types of rock drills by the number of working modes
The number of modes is one of the defining characteristics on which productivity and efficiency of work depends. Depending on the number of modes, all rotary hammers are divided into three groups:
The simplest form of this tool and the least productive. Only intended for drilling in relatively soft materials such as wood, drywall or thin sheet metal.
Includes not only drilling mode, but also hammer drilling. It is used for harder materials, including concrete and bricks. This is the best option for household use.
The most productive and common type. Includes drilling, hammer drilling and non-rotating hammer modes for use as a jackhammer.
6.Types of rotary hammers by type of cartridge
We have already said that the hammer drill chuck differs significantly from the drill chuck due to the special clamping method. These cartridges are called SDS, which is an acronym and literally translates as “insert, turn, clamp.” This type of cartridge was invented by the well-known Bosch company in the late 70s. There are five types of these cartridges:
- The SDS chuck accepts a two-slot drill or drill shank and is designed for a 10 mm shank that goes into the chuck 40 mm deep. 100% compatible with SDS chuck.
- SDS is the most common type of chuck used for light and medium rock drills weighing from 2 to 4 kg. It has 2 closed 2 open slots. The shank diameter for such a chuck is 10 mm, and the insertion depth is 40 mm. Able to drill a hole up to 26 mm.
- SDS top is rarely used, as it is designed for a 14 mm shank with a 70 mm insertion depth. Used for medium-class tools weighing 4 kg and is designed for drill diameters from 4 to 32 mm.
- SDSmax has 3 open and 2 closed slots. Designed for shanks with a diameter of 18 mm and a start depth of 90 mm. Designed for professional rotary hammers weighing from 5 kg. Able to drill holes up to 20 mm in diameter.
- SDSquick does not use grooves as fasteners, but special projections, which allows you to insert bits and drills with a inch hex shank into the chuck.
- SDShex is used exclusively for demolition hammers and is designed for peak and chisel applications.
2.Types of rotary hammers
The whole variety of rock drills can be divided into two main groups:
- Household. Designed for simple tasks and work with both soft and hard materials. For convenient work with such a tool as a home assistant, it is enough that it has a power of 500. 800 W, an impact force of 1.2. 2.2 J, it is equipped with a special speed control switch, has a protective clutch, includes at least two, and better three modes of operation. Useful additional features include an interchangeable chuck to switch to conventional drills, so you can use the tool like a regular drill, and a set of special keys for changing the drill.
- Professional. If you are engaged in construction or renovation, then you cannot do without a reliable tool. A professional puncher must have a power of at least 900 W, the impact force of such a tool must be from 8 to 15 J, the impact and rotation frequency must be large enough, but not more than 1500 rpm, otherwise such a tool will quickly wear out, be three-mode.
When you have decided which rotary hammer to choose, you can take a closer look at the main characteristics, which include both groups. Usually there are three types of hammer drills, but for a more accurate selection, we will highlight five.
5.Types of rotary hammers by power
The impact force of a hammer drill depends directly on the power of its engine. This indicator determines with what force the drill or drill will enter the required material. The higher this indicator, the higher the speed of the work performed.
- A light tool has a weight of up to 4 kg, the impact force of such a perforator reaches a maximum of 3 J, and a power of up to 0.8 kW. Such equipment is used exclusively for domestic purposes and only for drilling not too hard materials.
- The average device weighs up to 8 kg, the impact force reaches 9 J, and the power is in the range of 0.8. 0.9 kW. Used to make holes in reinforced structures or in materials with a high degree of hardness.
- Heavy hammer drills have a weight of more than 8 kg, their impact force reaches more than 17 kJ, and a power of more than 1.2 kW. Such a tool is used in professional activities and has practically unlimited possibilities.
Before making the final choice, you need to understand that not only the strength, but also the frequency of impacts depends on the performance of the tool and the speed of work. Even if the force of the blow is high, but its frequency is low, you will move slowly and spend a lot of time. The optimal frequency of impacts for a household perforator is in the range of 3-4 thousand bpm, and for professional ones it should reach an indicator of about 5000 thousand bpm.
8.Recommended manufacturers of rotary hammers
- Makita. This Japanese concern has conquered the American, European and Asian markets thanks to the highest quality of its products. For its tools, the company uses only high-quality materials, the assembly of devices is always done flawlessly. This manufacturer produces light and heavy rock drills. Pricing policy starts from 130.
- Bosch. We are all used to the fact that when they say Bosch, the quality of the products is beyond doubt. It is not surprising that this company was in the top three, because it is thanks to it that rock drills have such a convenient and reliable form of fixing drills in the chuck, like SDS. This German company is a leader in the production of power tools. Pricing policy starts from about 150.
- Hilti. This is a Ukrainian trade mark that has recommended its products quite well. Affordable pricing policy, a variety of models of both light and heavy tools will delight many consumers. Reviews of Hilti rotary hammers are only positive, the build quality and the materials used are also excellent. The unique service of this brand is warranty service throughout the entire service life. Pricing policy from 150.
- DeWalt is a Czech manufacturer that has established its tools as high quality professional equipment. In its production, the company uses powerful electric motors, reliable materials for impact mechanisms and high-quality electronics. The price of their tool starts from 140.
- Hitachi is a Japanese corporation that is constantly striving for improvement. Their equipment is designed to work with hard materials such as concrete and stone. They are distinguished by high reliability, ease of use, high-quality materials and a wide range. Hitachi hammer drills start at 110.
4.Views by type of drive
There are four main types of actuators, each with its own advantages. The choice of the drive must be carried out depending on the characteristics of the work performed.
- Gasoline drives will become indispensable if you are repairing the roadway, or doing work in open areas where there is no access to electricity. An internal combustion engine is installed in such rock drills, they have a very high impact force, and their low fuel consumption allows them to work for two hours from the moment the tank is refueled. Along with the advantages, they also have a number of disadvantages: you will need a supply of fuel, you will not be able to regulate the force of impact, from which unwanted destruction can occur, they have a very large weight, dimensions and a very high price.
- Electric rock drills are the most used in repair and construction work. The constant availability of a power source makes the operating time unlimited, they have good performance and sufficient power, they are additionally equipped with an anti-vibration system, which greatly facilitates their use, mainly they include tri-modes of operation, have a rotation speed regulator and an affordable price. Unfortunately, this type also has disadvantages: the radius of your movements will be limited by the length of the power cord, of course there is an outlet in the form of an extension cord, but nevertheless, if the voltage in the network is unstable, then the performance of the tool will be unstable, wear of the chuck during prolonged use and extra spending on buying a new one.
- Cordless rock drills are very handy in places where there is no access to electricity or when renovating building facades where you can hardly reach with a power tool. They are lightweight and compact, making them very easy to use. Despite using a battery, they have a constant rotational speed that can be adjusted and sufficient power to drill even concrete. The disadvantages include a limited operating time, which directly depends on the capacity of the battery, the need for recharging, which takes a long time, which means that you cannot use the tool immediately after it is discharged and stagnation occurs. Sometimes buying a new battery can be a daunting task, and if you accidentally drop such a tool, it will also fail.
- Pneumatic rock drills are mainly used in explosive areas, since the principle of their operation is based on the conversion of compressed air. They are lightweight, have a sufficiently high rotational speed and impact power. The disadvantages of such a tool are significant: for continuous operation, you need a compressor that will supply air. The area of movement will be limited by the length of the hose connecting the compressor and the rock drill, and most importantly. the high cost of such a tool.
The concept of “perforator” and features of its design
A hammer drill is a working tool that, in addition to percussion movements, also provides a rotational moment. Its use allows you to quickly and easily make a hole in both soft and very hard materials such as stone, concrete or brick. The hammer drills can also be used to dismantle hard material coatings or lay ducts. There are various models of rotary hammers, which differ from each other in the presence or absence of certain functions. But they all have basic elements in their design, without which their work is impossible. The most important components of a rock drill are its motor, gearbox, percussion mechanism and chuck. The percussion mechanism, which performs the main function of this device, can be electro-pneumatic or crank-connecting rod. The first type works on the principle of converting the torque of the engine gear to a piston, which creates an oscillatory moment and compresses the air space between itself and the ram, forcing it to repeat the oscillations, which, in turn, strikes the striker. Such a mechanism is equipped with a self-shutdown function, which occurs when the tool does not touch the surface.
Unlike the first type, the crank-connecting rod percussion mechanism does not convert the rotational moment into an oscillatory moment, but immediately transfers the impact to the piston, which in turn compresses the air space between itself and the ram and strikes the striker.
The gearbox acts as a transmitter of the torque of the engine gear to the chuck, thereby activating the impact mechanism. It consists of a set of different gears. bevel, cylindrical and worm gears and, in most cases, has a constant transmission torque ratio. The hammer drill chuck has a significant difference from the drill chuck. You know that the part of the drill bit that fits into the chuck is in the shape of a cylinder, which allows the drill to rotate with little resistance. The chuck for the hammer drill is designed in such a way that the drill must not only be inserted into the chuck, but also turned into special grooves. This ensures a secure fit, even with great effort. Many rotary hammers are additionally equipped with a safety clutch, which serves to preserve the integrity of the tool and protect the person performing the work. For example, if the punch is jammed during operation, the clutch will stop the rotation of the chuck, thereby preventing the engine from burning out.
Another useful feature is the anti-vibration system, which is a spring-loaded counterweight that absorbs most of the vibration and dampens most of it. The puncher body is made of metal or impact-resistant plastic. But most often these two materials are combined. With prolonged use, the case heats up a lot, and the metal better removes heat and prevents the instrument from overheating, while the plastic inserts on the handle protect from burns.
Drill chuck type
The most common are 3 drill attachment systems. If you need a small hammer drill weighing up to 4 kilograms, it is better to choose the model with the SDS plus fastening system. Such a device can make holes with a diameter of no more than 3 centimeters. Usually, this is quite enough for domestic needs, and such perforators are most in demand by buyers.
Professional models, sometimes weighing up to 11 kilograms, are equipped with an SDS max drill attachment system. These devices are quite large in size. However, they are able to punch rather big holes. up to 5.2 centimeters.
Two types of mounting, left SDS Plus, right SDS Max.
Recently, another type of fastening has begun to be used. SDS-top. It is well suited for making holes with a diameter of 1.6 to 2.5 centimeters. This mount is often used in devices manufactured by Bosch.
does not hurt at all. after all, hardly anyone has to work in sterile conditions.
Dust protection during drilling.
No less convenient is the anti-vibration system, which softens and compensates for the shaking of the device when drilling, chiselling or drilling.
Vibration protection system.
Another useful “trick” is the locking button that secures the punch in working mode.
True, each of the additional features does not make the device cheaper at all, so choose only what you really need. You should not, really, overpay for those functions that you will never use in the future.
How to choose a puncher. criteria for choosing a hammer drill for home or permanent work
When renovating or building a house, a hammer drill is one of the most needed tools. With the advent of this device, which can withstand significant loads, it has become easier and more comfortable to work. The choice of such devices today is huge. they are offered by every tool manufacturer.
And here’s how to choose a hammer drill that will be of high quality, convenient and will last a long time. This question is quite justified. after all, when buying, you will have to spend a rather large amount. this pleasure cannot be called too cheap. To make the right choice, you need to know the principle of the hammer drill and its design features. Let’s consider all this in detail to find out how different models of such devices differ from each other.
An impact drill and hammer drill are not the same thing
Some people mistakenly believe that a hammer drill works the same way as a hammer drill. But this is not so. although such a drill is called a “hammer drill”, the principle of operation of these two electric tools is strikingly different. Yes, they both punch holes, but the blows have different strengths, as well as different origins.
2-20 Rotary Hammer Drill Full Service ,600w Home Improvement. Bosch GBH
The hammer drill works as a punch through the gearing of two wheels called ratchets. At a certain pressure on the drill, an oscillatory movement of its axis occurs, which allows you to make a hole. But the performance cannot be high, and the blows are rather weak. Therefore, hard concrete, for example, cannot be pierced with such a drill.
But the hammer drill is just intended for drilling stone, brick and concrete. It also allows you to transfer force to the working edge of a lance, blade or drill, allowing these tools to work with maximum efficiency.
The hammer drill uses an electromechanical or electro-pneumatic type mechanism as the main structural element. Thanks to it, an impact force is created that is sufficient to punch through concrete or stone. In this case, the master does not need to press hard on the handle of the puncher. Some models have a mechanical percussion mechanism similar to that of a drill, but it is less durable than an electromagnetic or pneumatic mechanism.
The piston and the mechanism of the pneumatic impact system, as a rule, are equipped with L-shaped rock drills.
The mechanism of the “drunken” bearing type, which, while rotating, forces the firing pin to strike, such a mechanism is equipped with narrow perforators.
So, if you compare the mechanical and pneumatic mechanisms, you can see that the latter greatly facilitates work on a hard surface. When using a mechanical percussion device, three times more force is required than when using a pneumatic device. When choosing a hammer drill for home, it is better to pay attention to more modern models, and safely forget about mechanical ones.
Perforator complete set
And now let’s talk about the complete set of the perforator. the more complete it is, the fewer devices you will have to buy later. So, what should be in the case along with the device:
Spare brushes for the electric motor.
The special chuck, which is an adapter, will help you use conventional drill bits rather than keyless bits. After all, perforating drills are more expensive, and in the absence of such a cartridge, you will have to spend a lot.
Boers are the main kit. For domestic needs it is more than enough, but professional models need a more impressive set.
Punch operating modes
Now let’s take a closer look at how perforators with a different number of operating modes differ from each other. So:
The simplest devices are single-mode. They work in the same way as an ordinary drill. If you have to drill wood and metal surfaces, then they are quite suitable.
In a dual-mode device, the axis is capable of not only rotating, but also oscillating during rotation.
The three-mode hammer drill as an additional function has the ability to strike without spindle rotation. Such a device is the most versatile, it can simply drill, drill and chisel and just chisel.
The variety of models of rock drills suggests that each of them can have different modifications. over, they can be performed with one, two or three modes of operation. If we talk about the latter option, then it certainly costs more. But if you have to carry out work, both on drilling, so on drilling and crushing, then you definitely need to stop at a three-mode device.
When choosing a device, both its shape and design play an important role. Holding the device in your hand, you need to feel that it will be convenient to work with it. At the same time, pay attention to whether there are side handles that can be easily removed. great if this option is provided. It will help if you have to drill in a tight corner, for example. He took off the handles. and work with all the conveniences.
Rotary hammer power
Hammer drills are less powerful than electric drills. This is because drilling is much harder than drilling. Therefore, the punch shaft during operation does not require such a high rotation speed as that of a drill. For devices with different types of cartridges, the power is different. Models with SDS-Plus cartridges consume 400 to 800 watts. Rotary hammers with SDS-Max cartridges have a capacity ranging from 1 to 1.2 kilowatts. In fact, when choosing this tool, you should not focus on power. this is not the most important parameter.
Rotary hammer shape
In terms of shape, perforators are both straight and L-shaped. In the latter, the motor is located vertically, making the device more compact. In addition, the engine is cooled efficiently. Such devices can work for a long time without overheating, and they serve a lot. But their weight is very noticeable.
L. Rotary Hammer, Vertical Motor.
Narrow and long straight type perforators weigh less, and due to their design, they will crawl into any gap. The engine is placed horizontally in them.
Narrow, long rock drill, engine horizontal.
The device and characteristics of the punch
All punchers are divided into three types in terms of functionality:
- Single-mode. Impact drilling function only. Most often, such perforators are not used in everyday life, but are used as professional additional equipment for narrow purposes.
- Dual mode. Hammer drilling plus classic drilling or chiseling only.
- Three-mode. The tool is equipped with all the functions specified in paragraphs 1 and 2.
The choice of a hammer drill is based primarily on the characteristics of power and impact force. The higher these figures, the better the hammer to be fitted.
The impact force of the tool is sometimes not proportional to the power due to design features.
Types of working chuck for rotary hammer:
Which drill chuck to choose? For household or household chores, the keyless keyless model is best suited. Changing the nozzle in this version is convenient, easy and quick.
Rock drill classification by weight:
- Lungs. Up to 4 kilograms. Power is no more than 700 watts. Only have SDS-plus chuck for 26 mm drill bits.
- Average. 4 to 8 kilograms. Power from 700 to 1500 watts. Depending on the equipment, both SDS-plus and SDS-max are equipped.
- Heavy. than 8 kilograms. Power is over 1500 watts. Equipped only with SDS-max chuck for diameters up to 60 mm.
Bosch equips its latest rock drills 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 performance of the device, as well as the diameter of the hole to be machined, depends on the impact energy. For daily work with a hammer drill, this is one of the most important indicators.
It is essential that an impact drill at the “maximum” will very quickly deplete its resource, and with a hammer drill they perform 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 piston of the perforator strikes the working element, the faster the hole is punched.
It turns out that energy and frequency determine the level of performance. When choosing a perforator yourself, you need to evaluate the amount of work on chiselling, then, according to the specified characteristics of the impact frequency, calculate the approximate productivity.
What is the difference between a drill and a hammer drill and vice versa
The hammer drill 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 drill functions on the basis of pneumatics, and any impact (heavy) drill works thanks to mechanics.
We come to the conclusion that the hammer drill should be larger and more massive than a drill with an impact function.
How to choose a puncher for personal use?
Several 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, you could not just go to a construction supermarket and choose a suitable device.
How to choose a hammer drill for home
The best way to start the selection is to build on weight and power. Super-productive models for the home will definitely not be needed.
Domestic rotary hammers are mid-range tools in cost, power and weight.
Suitable criteria for home conditions and the following brands:
- Power from 600 to 900 watts.
- Shock 1.2 to 2.2 J.
- Three-mode medium punch. Drilling, hammer drilling, non-rotating impact.
- The rotation speed is necessarily regulated.
- Anti-jamming clutch.
- Keyless chuck.
- Replacement branded cartridge included.
According to these characteristics, three leading brands are distinguished:
- Makita. Sufficiently lightweight drills and hammer drills, with a warranty of several years. They have established themselves as tools for everyday household work, easy repairs. Average market price available, easy to operate. How to choose a hammer drill for home is this brand? Users refer to the Makita RK 2450 model. The required (useful) power is 700 watts, a shock of 3 joules, revolutions up to 4.5 thousand.
- Bosch. German quality and assembly. Leading edge in professional power tools and household equipment. Any models have been tested by time and weather conditions. Rotary hammers are equipped with the function of precise adjustment of the nozzle speed (drill, drill). When purchasing equipment from this manufacturer, pay attention to the color of the case. Blue classifies precisely the professional purpose. The most popular model is BOSCH GBH 2-24 DF. 790 watts, 2.7 joule impact, complete with SDS-plus interchangeable chuck and classic keyless chuck.
- Hitachi. The best tool in our market from Japan. Priced in the same category as the Makita, but some power tools, including rotary hammers, are lighter in weight. Are you wondering which hammer drill to choose from this manufacturer? Pay attention to the Hitachi DH 22 PG, 620 watts, 1.4 joules of impact and weighing only 1.9 kilograms.
You do not need 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.
How to choose the right hammer drill for your home
As a rule, starting the next apartment renovation with your own hands, you have to drill holes in the walls. This may be due to the need to hang a lamp or shelf in another place. It is good if the walls of the house are wooden or brick. But what if there is solid concrete all around?
A punch is indispensable. Why a hammer drill, not a hammer drill?
A drill is a device to drill holes. Drilling, not chiseling. For a hammer drill, the chiseling function is auxiliary, and is implemented very primitively. Two ratchets touching each other force the drill to make additional back and forth movements. The result is a swotting effect. Although the amplitude and energy of the impact are low. As a result, drilling a hole in a concrete wall requires significantly more effort than using a hammer drill. In addition, the impact ratchets are subject to heavy wear.
The hammer drill uses a pneumatic method of performing percussion actions. The drill is not rigidly fixed like a drill in a hammer drill chuck. Slippage is prevented by special longitudinal grooves at the end of the drill. As a result, the impact energy is stronger, the drill does not turn and the hole is drilled much faster. In addition, the vibration transmitted to the hands due to the not so rigid attachment of the drill as the drills in the hammer drill is much less. And it is not required to specially press on the perforator during operation. he drills himself. Which rotary hammer is better? Asking how to choose a hammer drill, which one is better, many go on about their own greed. And they try to choose a professional tool of well-known brands like the Japanese Makita (Makita) or the German Bosch (Bosch). A professional tool is good, no doubt about it. But how justified will your spending be if you have to drill holes from time to time? There is a great chance that an expensive tool will lie in useless junk until the next repair.
Therefore, it is worth realistically assessing the tasks to be solved with the help of this tool and reasonably approach the choice of a hammer drill for the home. In addition to the technical characteristics, which are discussed below, attention should be paid to the compactness of the instrument. Since many live in rather cramped apartments, there are places that simply cannot be crawled into with a large puncher. A compact, lightweight tool in this case will cope without difficulty. In addition, the low weight of a household or semi-professional rotary hammer will allow you to work with one hand if necessary. What is also important if you need to hold on with the other hand while working.
How to choose a puncher?
The most common punch bit clamp is the so-called Sds-plus. A lot of drills with such a limit switch are produced. So a hammer drill for simple household chores should be equipped with a cartridge for just such a drill attachment. The drill is replaced by slightly pressing the chuck. If an impact drill requires a lot of power for drilling, then a household rotary hammer does not need it in such quantities. Because he does not drill, but punches a hole. Therefore, for Sds-plus, a punch with a power of 400-800 W is quite enough. Especially on the power of the punch, you should not get hung up. Since it is not power that is more important, but the impact energy. It has to do with power, of course. But in addition, each model takes into account the mass of the striker, the amplitude of the working stroke and the frequency of strikes. For a household tool, a blow energy of 1-2 J. It is important to pay attention to such an indicator as the frequency of strikes. Together with the impact energy indicator, this characteristic determines the performance of the tool. Specific example. Rock drill characteristics: impact energy 1.2 J, power 450 W, impact frequency at idle speed up to 7500. The largest drilling diameter in concrete is 18 mm. A hole with a diameter of 6 mm and a depth of 80 mm is created in half a minute. than enough for home.
When deciding which perforator is better, it is worth remembering that a professional tool is distinguished only by increased reliability and the possibility of a longer operating time. That is, in one sitting, a professional tool will be able to drill more holes than with a household one. Otherwise, they work the same way.
On our website you can choose a puncher just for you. If in doubt, our managers will always help you.