Which rotary hammer is best for homework
If we calculate how many times in one minute the piston of the device hits its firing pin, then we get a value called the frequency of impacts. The larger it is, the higher the hole punching speed. The performance of a rock drill depends on both the frequency and the energy of the impact. The manufacturers that produce the most durable and efficient devices harmoniously combine these two parameters in their models.
Therefore, it is better to pay attention to reliable brands, whose products are of excellent quality and amazing durability. Specifically, we will talk about the best manufacturing companies a little further.
So, for example, protection from dust 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.
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.
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. In doing so, 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.
Now let’s talk a little about manufacturers. The most trusted brands that almost everyone has probably heard of are Bosch and Makita. It is in their direction that you need to direct your gaze when choosing a professional model of a perforator. And for home, in addition to these two companies, you can also advise the following manufacturers WATT, STERN, EINHELL, VT.
The rotational speed of the punch shaft is lower than that of the drill. this has already been mentioned above. Depending on the class of the device, the value of this value can be from 600 to 1500 rpm. The rotational speed decreases with increasing power and productivity of the rock drill. this is due to its design features. After all, in productive models, the optimal tooling diameter is quite large. In general, the shaft of the device rotates only in order to remove dust after drilling. A small drill has to rotate faster, and a large one. slower, otherwise it will wear out too quickly.
Models of rock drills with high shaft rotation speed are heavy, which does not facilitate ease of use. In addition, such high-speed devices wear out very quickly the spiral grooves, with the help of which the drilling waste is removed from the place of work. Because of this, the device begins to heat up quite strongly, and as a result, it can even jam in the hole.
And yet: household model or professional?
expensive and powerful professional devices are equipped with many functions. They are reliable and durable. It is easy to distinguish them: as a rule, all manufacturers’ models for professional use are painted in a different color than household ones. And there are corresponding inscriptions on them. But the most important difference between them is the time of continuous work, which in terms of duration is 7.8 hours, that is, the entire working day. However, why at home is a heavy and bulky device for the “pros”? Super tasks, as a rule, do not have to be performed, and for the most ordinary repair or hanging shelves, a middle-class model is quite enough.
Let’s list the optimal characteristics of a hammer drill that you plan to use for home use. With similar parameters, you can easily and quickly drill holes in concrete with a diameter of 1.6 to 2.8 centimeters, as well as perform other types of work.
So, a good hammer drill has the following parameters:
- Power. from 0.5 to 0.9 kilowatts.
- Impact force. from 1.2 to 2.2 joules.
- Operating modes. three (except for drilling, also chiselling and drilling).
- Shaft speed adjustment.
- There must be a protective sleeve. it will protect the device from jamming.
- The drill must be secured with the SDS plus system. no wrenches are required to clamp or unclamp the chuck.
Then see for yourself. hold the tool in your hands, try to make a test hole. If you feel that it will be convenient to work, take it. Of course, the hammer drill should be suitable for your application. Just keep in mind that when performing these tasks, the device must be handled carefully. on this below.
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.
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 the hole to be made. 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 hit, 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.
Rotary hammer network DeWALT D25134K
This allows you to use not only drills, but also drills with standard end fittings. Also track-jaw chuck, allows bit installation and use as an electric screwdriver. The maximum frequency of blows is 5540 beats / min. The consumed electric power is 800 W. Impact power in chiseling mode is 3 J. Diameter of drilling in concrete is 28 mm. Core drilling diameter 65 mm.
I am completely satisfied with the purchase, I will hope that the price is justified by the quality, and it will last a very long time! I can recommend it for purchase, for household purposes, although I think that for professional use it will also work. Igor Usanov
After the Chinese dexter, heaven and earth. Resourceful, almost attracted and no need to press. Still not heating up. I will come to his weight with the power of impact and the combination with fast revs gives an effect. Stepa I.
If you want to choose a hammer drill for your home, you can safely buy budget models. They have good technical characteristics, but are not designed for long-term operation under load. Models from the middle price category have sufficient functionality and power both for home use and for simple professional work. The premium models are capable of tough jobs, punch holes in even the toughest materials, are flexible and easy to use. Branded cordless rotary hammers, which do not have high impact power, but have wider possibilities of use due to the absence of dependence on access to the electrical network, belong to the same price category.
What are the punches
Perforators are divided into household small power from 450 W to 1000 W, small in weight from 2 to 4 kilograms, with an impact force from 2 J to 3.5 J, and professional from 1000 W to 3000 W and weighing up to 12 kilograms, with a force shock from 4 J to 20 J.
Also, perforators differ in the type of engine location, these are:
The horizontal arrangement is the most common and is used in household rotary hammers. Such a scheme is the most compact and convenient for work, but the disadvantage is the increased shock load on the engine and the worst cooling. Impact mechanism, usually using an oscillating bearing.
The vertical motor arrangement is usually used for professional tools due to the reduced shock load on the motor. It has better cooling, which allows more intensive use of the hammer drill. Impact mechanism, in most cases, crank.
Impact mechanisms with the use of an oscillating bearing, and a crank-connecting rod are pneumatic shock mechanisms and have a self-shutdown function at idle.
Modern rock drills usually have 3 operating modes:
- Drilling with impact (main mode);
- Drilling (drill);
- Impact (jackhammer);
Most often, perforators have two or three modes, single-mode, as a rule, this is a professional tool sharpened only for drilling with a blow, which does not have additional devices and mechanisms and, as a result, is more reliable and durable.
The most widespread are two types of cartridges: SDS and SDS max. Basically, they are no different from each other and represent a system when the chuck splines cover drills with grooves on the shank. The only difference is that the sds chuck uses 10mm shank drills and the sds max uses 18mm shank drills.
Type of food
When deciding which perforator to choose for the house, you need to have a clear idea of what types of repair work will be performed and in what conditions.
Rotary hammers by type of power supply can be:
In a domestic environment, electric rock drills are used in most cases, which are:
The mains tool is powered by a conventional electrical network, the rechargeable tool is powered by batteries (lithium-ion, nickel-cadmium or nickel-metal hydride). If it is possible to connect to an outlet, choose a power drill, paying attention to the length of the power cord (the longer, the better). And if there is no network connectivity, then a stand-alone cordless rotary hammer is the best solution, but it costs much more and is used much less often.
Let’s consider on specific examples which is better to choose a hammer drill for home
If we compare the above models in terms of characteristics, then it is impossible to find serious differences. In their class, these rock drills are approximately equal to each other. But if we look at the volume of sales of tools in Russia, then of course, the Makita HR 2450 hammer drill will take a leading position. This is primarily due to the price. Metabo and Bosch are more expensive brands. An important role is played by the possibility of self-repair in case of breakdown after the warranty period. Of all the 4 brands listed, Makita received the largest distribution of its spare parts in Russia. Thus, if we compare in terms of quality, then the brands are approximately equal, but in terms of the availability of spare parts outside the official service, you can safely assign
How to choose a hammer drill for work and home
The global trend towards urbanization is just one of the factors that have led to strong sales in the construction tools market. Another contributing factor is the popularity of Do It Yourself (DIY). than ever, people are excited about projects that used to be the domain of professional contractors.
Criterias of choice
Modes of operation. Their number, as a rule, reaches from 1 to 3. Here you should focus on the purpose of the hammer drill. One mode assumes only the possibility of drilling, the second. rotation of the drill and impact, the third. impact without rotation.
Drive unit. There are several types of them: electric (the most convenient and common, suitable for frequent household and repair work), pneumatic (ideal for work in places of increased fire and explosion hazard); gasoline (resembles a conventional bump stop, and therefore is intended for road repair work).
Cartridge. Distinguish between SDS and SDS max. The first is used in low power models, the second in tools with increased power.
Placement of the electric drive. It can be horizontal (provides comfortable work with the tool) or vertical (has a positive effect on the state of the engine, and also has a margin of endurance). For domestic needs, the first option is perfect, but for serious repair and construction work, it is better to choose the second.
Power and weight. These parameters depend on each other and can be equally large or small. So, low-power 400-700 W perforators weigh no more than 4 kg, models with an average power of 1200 W maximum. 4-6 kg, high-power 1200 W. more than 6 kg. It is also worth remembering that the heavier and more powerful the tool, the more serious tasks it will be able to do.
Energy saving. Rotary hammers are of the mains and battery type of energy saving. The first is characterized by constant readiness to work and decent performance, the second. by mobility.
Additional functionality and accessories. With add-ons, the cost of the tool increases significantly, but sometimes they are really needed. The list of useful functions and accessories should include: a thrust handle to ensure safety during work, a set of drills and a peak, control electronics, a safety clutch, a reverse function, a backlight to increase the accuracy of work, a dust extraction system and a depth gauge.
and model line of DeWALT rotary hammers
- Check how comfortable the pistol grip feels to you. It is very good if it is equipped with soft rubberized pads. both against slipping in the palm and to reduce the vibration effect on the hand.
- Without fail, the perforator must have an additional handle installed in the area of the cartridge. The position of the handle should be easy to change and securely fixed.
- There are complaints that some models are equipped with a too short power cord. This point is also worth paying attention to.
- Rotary hammers can be equipped with additional functions and special devices:
By the way, not all models are equipped with a reverse. among cheap rotary hammers there are many products that allow only one direction of rotation.
The illustration shows well some of the accessories of the rock drill.
key for switching to reverse rotation.
button for locking the start button in the on position.
hole for installation of the rod of the drilling depth limiter and the retainer.
- It’s great if the purchased model is equipped with security systems. This refers to the following:
- Working with a hammer drill is almost always accompanied by a considerable vibration that goes into the hand of the master, which makes the fatigue run up much faster. Many modern models are thought out in this regard as well. These are both comfortable soft pads on the body, and damping springs hidden in the handles, which significantly dampen the vibration effect on the hands.
Rotary hammer with anti-vibration protection of the main pistol grip
- You should pay attention to the quality of the kit. Almost all models of well-known manufacturers go on sale in convenient cases, which provide a place for the necessary equipment.
Quite a common punch kit
A simple device that prevents dust and sand from scattering and getting into the eyes when drilling holes in the ceiling.
The kit sometimes includes (and if not, it is recommended to immediately purchase additionally) a special rubber sleeve or a corrugated cap, allowing to collect the “rock” selected from the hole being made. Very convenient, especially when working on the ceiling. dust and sand do not fly into the eyes.
Which hammer drill to choose for the home: recommendations, an overview of the best models and cost
About twenty years ago, most of us did not even dare to dream about this instrument, and if it appeared at someone’s place, it became the subject of acute envy. Let’s try to understand this issue in more detail. which hammer drill to choose for the house in order to get a really reliable “helper”.
Now the hammer drill has become almost an obligatory item in the home instrumental “arsenal” of a good owner. It is probably even difficult to explain to the young generation of home craftsmen today that making even a small hole in a concrete wall or ceiling once took a lot of physical effort and ten to fifteen minutes of time. With a punch, this operation takes a few seconds.
But in order for this tool not to bring quick disappointments because of wasted funds, to fully justify all the expectations of the owners, it is necessary to approach the issues of its acquisition with knowledge of the matter. That is, take into account the nature and scale of the work that is planned to be entrusted to him, skillfully navigate the evaluation criteria that allow you to choose the most suitable model in all respects.
Working spindle speed
It is definitely less than any of the drills. And chasing some high performance is absolutely not required. The normal range for a rock drill is considered to be from about 500 to 1500 rpm. by the way, as the power of the device grows, as a rule, the number of revolutions even decreases. this, according to the “golden rule of mechanics”, is due to the specifics of the tool. In addition, high RPM is likely to lead to very rapid tool wear. As a rule, in high-quality models, the developers have achieved an ideal “harmony” of the rotation speed and the impact of the tool.
True, the function of changing the number of revolutions, although it is not considered “vital” in this case, still will not be superfluous. this parameter can be varied depending on the type and diameter of the equipment used. It is very convenient if the tool is equipped with a system of a smooth set of revolutions. this allows you to avoid mistakes at the initial stage of drilling a hole.
Traditional placement of the speed controller. on the start button
Some modern models, in addition, are equipped with an electronic system for maintaining a stable number of revolutions under load. That is, depending on the density of the material in which the hole is made, the automation selects and maintains the optimal rotation mode. The function is useful, but it is accompanied by the complication of the tool and the growth of its cost. How much is required by the future owner. let him decide for himself.
Possible modes of operation of the punch
But this is a very important selection criterion. The fact is that even one manufacturer can produce very similar externally models, but with a full or “truncated” set of features. That is, again, one should imagine both the nature and the scale of the upcoming work.
- Hammer drills are available that have only one function. hammer drilling. Basically, this is the basic purpose of an entry-class tool. If this option suits you, you can save a lot on the purchase cost.
- Normal drilling function, that is, without translational impact on the drill. True, to use it, you will have to purchase special equipment. These can be drills with SDS shanks. I must say that they do not “shine” with a wide range of diameters, and they are quite expensive. Therefore, they often choose another option. they purchase an additional chuck (collet or quick-clamping), equipped with a shank suitable for the selected perforator. Sometimes such a cartridge is included in the basic kit.
Special chucks with SDS shanks to work with conventional drills
For the sake of fairness, we note that the function of conventional drilling can in no way be attributed to the main ones. And in terms of accuracy and productivity, a conventional drill will significantly surpass a rotary hammer. Of course, having an additional low-speed device for performing such operations will not hurt. But if the farm has a high-quality drill, then the lack of this function in the hammer drill can be neglected.
By the way, one of the functions of the perforator was mentioned above. using it as a construction mixer. This, of course, is also carried out precisely in the conventional drilling mode, only with the installation of the corresponding nozzle in the chuck. And it should be noted that experienced craftsmen still do not recommend using a low-power perforator for such purposes. too much torque resistance, which is observed when mixing viscous solutions, can destroy the gearbox or electric drive.
- The chiselling function is needed by almost any owner. True, you should not get carried away with it if you have a device of a small “weight category” at your disposal. Of course, removing old tiles or peeling plaster is no problem. But if you are planning to dismantle the wall, crush the screed or blind areas around the house. such operations will not ruin your tool for a very long time. By the way, I finally finished my first and most beloved perforator with this.
The chiseling function is extremely useful. But to abuse it, if the instrument belongs to the category of lungs, it is still not recommended.
The mode switch can be executed in different ways. There is an option when it consists of two handles: one is responsible for turning on and off the torque, the second, respectively, for the shock function. For many models, this “control” is unified. one rotary switch with a fixing button in a given position, so that there is no unauthorized change of the mode during operation under the influence of vibration.
An example of a punch mode switch
The switch positions are marked with self-explanatory pictograms. Usually they are something like the one shown in the illustration.
Note another useful position below. Anyone who has done slotting work with a hammer drill probably knows how infuriating it is that the chisel is trying to occupy a position that becomes extremely inconvenient for the master. You have to stop the process, give the rig the desired position, or make a lot of unnecessary movements during work. And in this regard, tools equipped with the function of locking the harness in a given position (often called “Vario-Lock”) are in a winning position. There can be from a dozen or more such provisions. And during operation, the bit will never rotate away from the set position.
What they focus on when choosing a hammer drill for home?
First of all, that all perforators are conventionally divided into three categories. The first includes relatively light models weighing up to 4 kilograms. “Average weights” usually pull 4 ÷ 6 kilograms. And finally, the mass of powerful professional models can significantly exceed even 8 ÷ 10 kg. According to this criterion, the working capabilities of the tools also change: if the former are designed for periodic use for drilling small holes or making strips in a rather pliable wall material, then heavy perforators are able to cut through channels of large diameter even in a concrete monolith, demolish powerful partitions, dismantle thick screeds, and tp.
It was, so to speak, an unofficial classification. Now let’s turn to the performance indicators, which are necessarily prescribed in the technical documentation of the product.
Is it possible to do without a hammer drill on the farm?
How did you make holes in concrete before? For this, a special tool was used. a bolt. In fact, this is a hollow pipe of the required diameter, along the end cut of which the teeth were cut with a “crown”.
Masters of the older generation are very familiar with this simple “manual perforator”. bolt
The bolt itself, a heavy hammer, was being prepared for making the hole. In the work, a clean rag turned out to be useful to periodically wipe the sweat rolling down the face from excessive efforts, and a set of “strong words” that helped to more easily endure the pain when the hammer hit not on the bolt, but on the fingers of the hand holding it. In the process of such chiselling, the bolt was periodically rotated around the axis, and the process continued until the hole reached the required depth. Then, more often than not, a planed wooden cork was tightly driven into it, into which it was already possible either to hammer in a nail, or to screw in a screw.
Performance?. yes, no! Hole punching speed?. this is how lucky you are. It happened that such a strong fragment of crushed stone filling came across that the “procedure” required several visits with pauses, and sometimes it was necessary to abandon the opening at all. It is even worse if a reinforcing bar is encountered in the path of the bolt
The author of these lines received his apartment at the end of 1991. A new nine-story reinforced concrete building with bare, unfinished walls, windows of nightmarish quality with wild cracks around their perimeter. There was no experience of construction work in his youth. had to learn on the go. The tool was also very poor, but there was a bolt and a hammer. And the process of hanging cabinets on the walls and cornice-strings on the ceiling. cut into the memory very well.
While on a business trip. at the Tushino radio market I bought an electric drill of the Voronezh assembly “Energia”. At that time, it was a real “miracle of technology”, even with a speed control on the release button. But most importantly, the kit included a drill bit designed for hammer drilling.
Drill head, which created some effect of drilling and hammering
A cartridge was screwed off the drill, then a nozzle was put on a cylindrical neck near the spindle and tightened with two screws. The spindle had two splines that engaged with a hole in the transmission clutch located inside. After that, the chuck was screwed to the spindle of the nozzle, it was possible to install and tighten the drill and start work.
The principle was simple, “I can’t do it”. rotation was transmitted through a clutch with a toothed notch, which, when the drill was pressed against the surface where the hole was being made, slid along the same toothed notch in the nozzle body. This created, in addition to the twisting, also the semblance of the translational impact movement of the drill. By the way, it is on this principle that many electric drills still work, positioned as equipped with an impact function.
The principle of creating a translational force by transferring rotation through a pair of gear clutches is still used in many models of electric drills. The scheme is extremely imperfect, and everything is much more complicated in punchers.
I cannot say that work with such a nozzle went like clockwork. In order for such a “shock impact” to give at least some visible effect, you had to lean on the drill with all your weight. But in many areas (for example, when drilling holes in the wall in the area under the ceiling), it was simply impossible to apply such an effort, and more crackling was obtained without any visible benefit. Pobeditovye drills with such drilling in concrete “licked” very quickly. And worst of all, the drill’s gearbox got terribly hot, that is, it was necessary to make frequent and very long breaks in work. The process was built from the alternation of drilling operations and machining the hole with a bolt, if a hard pebble came across.
In short, the hopes were clearly dashed. Therefore, 8 years later, when the overdue repair was started, already at a higher level, the drill was not even considered as a tool for such operations. During this period, hammer drills were no longer entirely a curiosity. And in advertising newspapers there were a lot of ads offering such services. the happy owners of the tool did a good business on it. A call for such an announcement informed about the price. a dollar for one hole drilled! The work was large-scale, so it was decided that it would be cheaper to buy your own perforator. At the level of salaries at the time, the acquisition was horribly ruinous (comparable to a monthly salary), but I never regretted it. Since then, the hammer drill (the third in 17 years) has always taken pride of place in my toolbox. over, the for such a tool have become not so “biting”.
Here he is, the “old man”, repaired several times, but still faithfully served for more than ten years. For some reason, the hand still does not rise to throw it away
In a word, there is no need to doubt! A perforator should be in a good owner. such a tool will always find application. And the owner will get rid of many problems with carrying out a variety of operations both during construction or repairs, and in everyday practice.
Brief overview of popular models
When choosing a perforator, you should give preference to trusted manufacturers who have already earned the full confidence of buyers. These traditionally include, for example, the brands Bosch and Makita, DeWALT and НITACHI. Quite decent equipment is offered by the companies BORT, DLACKDECKER, RYOBI, Metabo, AEG, SPARKY. Among domestic manufacturers, the Interskol brands deserve attention. Caliber, DIOLD. especially due to the low cost and affordable service.
Due to which the impact force of the perforator is created?
The work of the hammer drill is based on the use of impact action and torque. These efforts can, depending on the selected mode, be used individually or in combination. It is characteristic that in terms of the number of revolutions and the frequency of blows, perforators are significantly inferior to the same drills with an impact function. But an optimally matched combination of efforts just provides the capabilities for which the rotary hammer is famous.
We will not “disassemble to the screw” within the framework of this publication. Now it is more important just to understand how the working effect is created on the tooling.
It is clear that any rock drill is equipped with an electric drive (motor) that generates torque. Through the gear system, this rotation is transmitted, if necessary, to the working spindle, and then to the chuck with installed equipment. In chiseling mode, this gear is broken. no rotation of the chuck is required.
But how is the impact force created? That is, how the torque is converted into impulse shocks directed forward?
Most modern rock drills use a pneumatic circuit. The design may vary depending on the layout of the instrument. So, two main schemes are used. with a vertical or horizontal arrangement of the power unit.
An exemplary design of a rotary hammer with a vertical electric drive.
As you can see from the above illustration, the axis of rotation of the drive when it is vertical is perpendicular to the axis of rotation or impact movement of the work equipment. This mutual arrangement of the nodes makes the use of the crank drive optimal.
Diagram of the pneumatic unit for creating the impact force of the perforator
The torque is taken from the reducer through the gear train (pos. 1). Rotation is transmitted to the flywheel-crank (pos. 2), with which the connecting rod (pos. 3) is pivotally connected, which converts rotary motion into translational motion. A working piston (item 4) is installed at the opposite end of the connecting rod. The piston has well-fitted seals and fits snugly against the walls of the air cylinder (key 5). Another piston is located in the cylinder itself, which is called free or flying (pos. 6).
When the crank rotates, the working piston moves forward along the cylinder, creating an area of increased air pressure. Under these influences, the free piston moves forward and strikes the massive striker (pos. 7), which, in turn, transmits this shock impulse to the shank of the installed equipment (chisel or drill). At this time, the working piston begins to move backward. From a hard blow to the striker, the flying piston bounces back, but already in the phase of its reverse movement, the working piston is already moving towards it again. And the excess pressure on this counter stroke of the pistons in the cylinder increases rapidly, which contributes to an increase in the force of the next blow of the free piston to the firing pin.
As you can see, to create an impact force, in contrast to a hammer drill, it does not even require too much pressing of the equipment against the work surface. It often even becomes harmful, causing unnecessarily rapid wear of parts.
The second common type of rock drills is with a horizontal electric motor. It is not positioned coaxially with the working spindle, but parallel to it. And here a slightly different principle of transferring the translational motion to the working piston of the pneumatic cylinder is already used.
The principle of power transmission in rotary hammers with a parallel arrangement of an electric drive and a working spindle
In this case, one of the parts of the gearbox becomes an oscillating, or, as it is more often called, “drunken” bearing (pos. 1). Its peculiarity is that when it rotates, it sets the oscillatory movements of the link pivotally connected with it. the lever (pos. 2), which, in turn, already transmits the translational movement to the piston.
Dewalt DCH773 2IN Rotary Hammer
Editor of the “construction” category on the Stroyday.ru portal. Specialist in engineering systems and drainage.
The scheme with a vertical drive and with a crank mechanism is still considered more reliable. capable of generating much more significant effort. It is no coincidence that most professional rock drills with high power and high impact impulse have just such a layout.
What are punches
In the modern repair and construction market, there are many options for electrical devices for construction purposes from different manufacturing companies. How Do I Pick a Good Rotary Hammer? This question is for sure fundamental to you. First, you need to decide on the type of device, because all devices are of two types:
You should not immediately make a choice in favor of the household option if you decide to purchase a hammer drill for your home. Which unit to choose is not an easy question, because it is worth considering all the subtleties of the purchase.
So, both models are different from each other, since they have different degrees of stress. At the same time, both household and professional models have many functions. It is worth saying here that construction site repairmen and home repairmen, in fact, perform the same function, so there is no need to purchase a more expensive model to improve the quality of repairs.
We advise you to evaluate the advantages of household power tools, since you can choose a hammer drill for household work based on its power, ease of use and the number of the most necessary functions for repair. This will be quite enough for high-quality repairs in the house.
Impact drill or hammer drill: what to choose
Much more often in carrying out construction work, preference is given to a hammer drill, and not a drill. Why is this happening? After all, the drill has great power and at the same time its weight is several times less. In addition, drill consumables are much cheaper and can be purchased without any problems on the Internet or on the radio market. Then why is it better to choose a hammer drill for the home, rather than a drill?
Note that the drill allows drilling without hammering. However, a blow in a drill is also possible, but this function is auxiliary. At the same time, before choosing a hammer drill for the job, you must understand that its main function is hammer drilling. In a drill, the percussion mechanism is presented in the form of a conventional “ratchet”, but in a device with more power, everything is not so simple. After all, the device has both an electro-pneumatic and an electromechanical principle of impact. In this case, the second option bypasses the drill significantly.
However, do not underestimate the power of the drill. It is important to understand that this power tool is suitable for slightly different uses. If you do not know how to choose a drill with a hammer drill for your home and what to look for when buying, it is worth considering the main advantages of these construction tools.
What to look for when choosing a device
There are many aspects to consider before choosing a hammer drill for your home. Feedback from friends and acquaintances in this case is not always appropriate, since there may be completely different aspects in your construction work. The hammer drill must be judged solely on the basis of its quality characteristics, as well as its suitability for use at home.
So, before buying a device, you should pay attention to indicators such as:
- power. In modern models of such power tools, it ranges from 450 to 2000 watts. Before choosing the right hammer drill for your home, assess the degree of upcoming construction work and, if you decide that the best device option for you is a household type, then feel free to purchase a model with a power of 900 W;
- device type. Models are horizontal and vertical. In the first case, the electric motor is located parallel to the impact axis, in the second. perpendicular. Horizontal models are more suitable for domestic use, since they are somewhat narrower and longer than vertical ones;
- impact force. This indicator determines the interaction of the device with the working surface. Simply put, the speed of use and its effectiveness depend on it. Here it is worth paying attention to the power, since this indicator will help you to choose the right puncher. For home use, the model with an impact force of up to 4.5 J is optimal;
- number of modes. In modern models, there are such modes of operation as drilling, hammer drilling and hammering. The three-mode option is the most optimal for both domestic and professional use;
- cartridge type. On modern models, the most common cartridges are SDS and SDS max. For domestic use, the SDS version with 15 mm diameter drills is most suitable;
- model weight. The time of working with the tool depends on this indicator. The optimal model for home use weighs from 2.6 to 3.3 kg.
When purchasing additional important accessories for a model, pay attention to a detail such as a drill. How to choose a drill for a rock drill in such a way that it is most effective? First, determine the option of the diameter and length of the part you need (they are individual for each device). The shape of the cutting surface is another important feature. The optimal drills for use are those models that hold evenly in the channel and do not jump to the side.
Those users who have experience in the construction industry are sure to have favorites among modern manufacturers. We tried to highlight two main brands that are distinguished by high quality production and are in great demand in the construction market in our country. these are Bosch and Hitachi. Which is better to choose: Bosch or Hitachi? Which hammer drill is the most suitable for home use? In order to answer this question, it is worth considering the functionality of each model.
- the motor power is 780 W, and the impact force is 2.8 J. This is quite enough for interaction with solid materials. Therefore, if you do not know which perforator to choose for concrete, you can safely purchase this model;
- there are special pads on the handle of the model, which allow you to reduce the force of impact during use and make your work more comfortable;
- the speed of revolutions reaches 3000 per minute;
the model can be used to create holes for the rosette and to prepare any kind of mortar.
Now let’s take a look at the advantages of Hitachi:
- the power of the power tool is 1200 W;
- the frequency of revolutions per minute can be from 120 to 250, depending on the type of construction process;
- for the convenience and safety of the user, the device has a special safety clutch and aluminum protection of the gearbox, which will remove heat;
- the maximum diameter of holes that the tool can make is from 45 to 125 mm.
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Compare all of the above characteristics before choosing a hammer drill. For concrete as well as interactions with hard metals, both are excellent.
Which hammer drill to choose for home
A hammer drill is a very popular power tool in our time, which is used to punch holes in hard metals using a percussion tool. The principle of operation of this device is quite simple: the structure of the processed material is destroyed due to the rotational action of the tool. If you need to purchase this tool, then you probably wondered how to choose a hammer drill? Or maybe it’s better to get a drill? Let’s consider everything in order.
Which rotary hammer to choose for work: important points
Accordingly, as far as work is concerned, for professional use you need to choose powerful rotary hammers.
For example, even experienced craftsmen are wondering which perforator to choose in terms of power so that the tool can withstand many hours of stress.
That is why, before choosing a hammer drill for work, be sure to pay attention to the power of the tool. One of the most important technical parameters of rock drills is power. And, the more the power of the tool, the more it will weigh. Almost all tools are made according to this principle, so you yourself must choose the right rotary hammer for work, taking into account its weight.
Often, buyers also have questions about how to choose a hammer drill for production, or which hammer to choose for installing air conditioners.
In both cases, it is necessary to take into account all working conditions and individually select a perforator. Since there are many parameters that affect the operation of the punch.
How to choose the right hammer drill for home: selection criteria
You often ask how to choose a household rotary hammer and what to look for when buying such a tool. First, you need to familiarize yourself with what types and types of rock drills exist in general.
For example, according to the method of use and the recommended loads, perforators are divided into:
Drill Hammer: Best Rotary Drill Hammer 2021 (Buying Guide)
As for professional tools, they weigh much more and are much more powerful than others. The big and main advantage of professional tools is that they can withstand large and prolonged loads.
In turn, household tools are designed for periodic work.
Which punch to choose for a home craftsman
In addition to the fact that perforators are divided into household and professional, they are also divided according to several parameters, in particular, according to the method of power supply.
This is a rather important criterion, since you need to choose a hammer drill based on where you will work on it and in what conditions.
So, according to the feeding method, all rotary hammers are divided into:
- Electrical tools. This type of power supply allows you to operate the instrument only when there is an electrical outlet or where an extension cord can reach. The advantage of such rock drills is that they can work continuously and without recharging.
- Cordless tools. If you have a need to work on the street, or in the country, then you will need a cordless tool, since you will not be dependent on the availability of outlets nearby.
Also, it is worth considering that some modern models of battery-powered rotary hammers can work without losing power at all. Therefore, the question remains how to choose a cordless rotary hammer for home use.
The only thing you have to get used to and do not forget about recharging the battery.
Based on the fact that most often you will work at home, where there are sockets everywhere, you do not need to buy a cordless tool, you can easily do with a network puncher.
If you still do not know how to choose a good rotary hammer, then an ideal example of a tool that is suitable for both domestic work and for longer is the SDS Yato rotary hammer, model YT-82770.
This is a fairly light hammer drill that will be comfortable to hold in your hand while working. Such a hammer drill weighs only 2 kilograms.
Thanks to its low weight, short body and long-lasting battery, it is ideal for stretch ceilings and serial drilling in concrete.
It is also recommended to buy such a tool not only for household work, but also for installers and electricians.
It should be borne in mind that this Yato rotary hammer is capable of performing as many as three functions, in particular, drilling and hammer drilling, as well as forging.
The Yato rotary hammer also boasts a good battery, for example, with one battery charge, it can easily make close to 60 holes in concrete. It is also recommended to have a second (spare) battery to replace.
In addition, there is a special quick-detachable SDS-plus holder, a 4-stage battery charge indicator and protection against overheating of battery cells.
It is worth considering that for domestic use, you can choose an inexpensive rotary hammer, since infrequent work does not require the most powerful tool.
Which hammer drill to choose: useful tips
During any construction or repair work, you cannot do without a hammer drill. And how to choose the right puncher, for the masters, question number one.
Now we will tell you about all the nuances of choosing and even how to choose a hammer drill for home use that will meet all your expectations.
Which rotary hammer to choose barrel or straight
There is another difference worth paying attention to, which affects the work process and productivity. The point is that rock drills are still divided after the location of the engine into straight and barrel rock drills. Now we will help you figure out how they differ from each other and how this affects the work in general.
If we take a closer look at straight perforators, then in appearance they look more like a drill. They are also characterized by a horizontal engine and basically this type of model weighs a little.
The straight type hammer drill works best in tight spaces due to its compact body and weight.
Drum rock drills are classified as medium to heavy rock drills. The body of such perforators is in the form of a cylinder and is located vertically relative to the body, an active anti-vibration system, then working with it is not so comfortable due to the increased amount of vibration.
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Rotary hammers Yato: rules of operation
In order for your perforator to last longer and perform the assigned tasks without problems, you need to adhere to the elementary rules for operating the tools.
Among the rules that must be adhered to, it is worth highlighting:
- Use chucks for their intended purpose and in accordance with the hammer drill. For a specific type and model of rotary hammer, use only cartridges that are designed for that model.
- Remember to clean and lubricate every time after use.
- You should not use the hammer drill continuously, it should be allowed to rest every few hours.
- You cannot use only the shock mode for a long time, it is necessary to alternate the modes if possible.
- If you notice even the smallest malfunction or breakdown, then first of all you need to contact the service center.
Also, do not forget about your own safety rules while working and take care of yourself. Be sure to work with protective gloves, special clothing and during the work process, focus on the tool. If you do not feel well, then in no case do not start work.