For home repairs, remodeling, and other renovations, a hammer drill can easily drill through hard materials like brick, concrete, and stone. This type of power tool is similar to a regular drill but works like a hammer drill, making it especially useful for do-it-yourselfers.
The impact drill is suitable for heavy work such as drilling or breaking concrete or bricks.
Best Professional Hammer Drill
This Makita Hammer Drill is lightweight (3.7 lbs.) with large capacity drilling up to 5/8-inch in concrete. Ball-bearing construction for longer tool life. Large two-finger trigger switch with a 360-degree swivel side handle for added maneuverability. Rubberized comfort grip for more comfort, control, and reduced operator fatigue. True variable speed for a controlled start-up. Ergonomic in-line design. This Makita model comes with a carrying case.
How To Use A Hammer Drills?
Buyer’s guide for hammer drills
This review and guide provide information on some best hammer drill for home projects you can find.
There are quite a few drill press manufacturers on the home improvement market today, and prices vary widely depending on the model and design. Purely in terms of price, drill varies in models that are available for just under $89 each. At the other end of the scale, however, there are impact drills that can cost interested hobbyists nearly $120.
Hammer drill reviews
All our reviews are based exclusively on expert judgments or practical experience with most of the hammer drills we have tested. We strive to make our guide as independent and as detailed as possible.
Best corded hammer drill
DEWALT Hammer Drill DW511
Powerful percussion drill
The DEWALT DW511 1/2 in. (13 mm) Single Speed VSR Corded Hammer Drill is a lightweight corded drill built for extended use with variable speed, dual-mode hammer drill for wood, steel, or masonry applications, 360-degree side handles with depth rod, two-finger, rubber trigger. Specs: max watts out 650W, no-load speed 0-2,700RPM, blows/Min 0-46,000BPM, capacity in steel 1/2 in., wood 1-1/4 in., concrete optimum 5/32-3/8 in., 11-1/2 in. long, weighs 4.3lbs. Includes side handle, depth rod, chuck key with holder.
Bosch Single-Speed Hammer Drill 1191VSRK
Cheap Hammer Drill
This easy-to-handle drill has a dual-mode selector, which easily converts the tool from rotation-only to hammer-drill mode. The variable-speed trigger with reversing allows accurate bit stars as well as removing fasteners, as this tool has a metal front housing for longer life and a heavy-duty keyed chuck for secure drilling. It is 4.1 Lbs. hammer with a 7.0 Amp motor that produces 0-48,000 no-load blasts per minute and a no-load drilling speed of 0-3,000 RPM. This drill supplies a 360° locking auxiliary handle with a built-in, quick-release depth gauge.
ENEACRO Heavy Duty Rotary Hammer Drill ENRH3203
Masonry hammer drill
Maximum impact force
The hammer drill achieves an idle speed of 880 rpm and a maximum impact frequency of 4350 bpm, and is suitable for various jobs such as dismantling walls, breaking up floors, decorating houses, and so on. With a good heat dissipation system, the motor of ENRH3203 will not get hot even after a long time of operation.
What should you look for when buying a hammer drill?
The best drill for concrete walls
Drills are used where drills and percussion drills are no longer powerful enough. Drills should be used especially for drilling in concrete and hard stone (natural stone, masonry). In addition to drilling, chiseling is also possible. Therefore, hammer drills with chisels are often used for demolition work. They can be used to quickly and easily punch holes in walls or tear down entire walls.
When buying should pay attention to the following:
- The power consumption of a 700-watt hammer drill is an important limit for achieving good performance in all areas. Significantly less powerful devices are only suitable for occasional work and heat up quickly in continuous operation. Power above 1000 watts is not even necessary for continuous operation in normal household use.
- The number of strokes per minute of a hammer drill should not be too high, otherwise, the individual strokes will have too little power. But it should also not be too low, otherwise, the work will take too much time. The drill should deliver 4,000 to 4,500 blows per minute.
- The maximum impact force is especially important because it shows how much force a single blow has. The impact force should be at least 2 J for the hammer drill to work well.
- When it comes to the gearbox of a percussion drill, you can distinguish between a 2-speed gearbox and a 1-speed gearbox. Models with a 2-speed gearbox may have more power consumption. This can be an advantage, especially if you want to drill accurately. The percussion drill test shows you: In first gear, you can start drilling relatively slowly and aim as accurately as possible. When you shift into second gear, you can drill relatively quickly.
- Drill guns that are adequate for basic home use require a drill thickness of only 0.87inches in concrete and 0.51inches in steel. However, they must have this drill strength to be used for all types of activities.
- Weight plays a big role in a drill. Pay attention to the weight of different models, especially for continuous use. It ranges from 4lb to 8lb.
What must be observed when using a hammer drill?
As with all technical equipment, some rules must be observed when using it.
- It is advisable to wear suitable protective clothing. Clothing must cover all parts of the body. Additionally, protective goggles and gloves should be worn.
- Since the hammer drill makes relatively loud noises, you should not use the device during downtime.
- Others should stay 2-3 meters away from the drill to avoid being hit by flying stones.
- Do not use the rotary hammers if you are taking medication that can alter your perception.
- Use only truly appropriate accessories. A pointed chisel and various drill bits are usually included in the starter set. However, when buying additional accessories, make sure that they are suitable for your own quick-change chuck.
How does a hammer drill work?
The impact drill combines the phases of drilling and punching. This facilitates the drilling of holes in mineral material (e.g. brick or concrete). An additional stroke of over 4000 strokes per minute removes the material. The rotary motion allows the cutting edge of the drill to penetrate the stone and push the dust outward. These devices are mainly used manually and without mechanical aids.
Questions about the hammer drills for home projects
Which grease is used for hammer drills?
Modern hammer drills all have an SDS drill chuck, but hammer drills with SDS-Plus are also popular. Of course, you need special drill bits for this drill chuck. In addition to the drill bits, however, grease is also needed so that the drilling and percussion function does not damage the drill chuck or the drill bit gets stuck completely. For this reason, the plug connection should always be well greased and free of dust and dirt. Grease is available from all manufacturers, but we recommend the grease from Makita, as it produces the best results. For proper oiling, it is also often worth buying a proper grease gun.
Which drill a bit for the hammer drill?
There are different quick-action chucks for the rotary hammers. Most manufacturers use the SDS-plus system. Excellent drills in this area are available from Makita. Large machines may have the SDS-max system installed. The drills are significantly more expensive and have a thicker shaft. However, a set with the most important drills, can not be purchased for less than 75. The cordless hammers from Bosch usually have the SDS-quick system. Special and smaller drill bits are needed here. The hammer drill comparison has shown that good drill bits here are from Connex.
How many joules of power does a hammer drill need?
It is always difficult to give concrete values here. As a rule, the power should be appropriate for the construction project. In a hammer drill test, you will realize that 2 joules should be available so that the hammer drill can be used for all kinds of work.
Can a hammer drill also be rented?
Especially in the private sector, a hammer drill is used very rarely. So that an expensive purchase does not have to be made immediately, hammer drills can also be rented in hardware stores. Often, all that is required is a deposit and a small fee to rent the tool for a certain period of time. Depending on the model and manufacturer, the tool is handed over in a suitable case to have a reasonable transport option.
Conclusion about the hammer drills
When it comes to construction or any other construction-related project, you need to have access to a hammer drill to handle projects in a more advanced mode. Concrete and other types of extremely hard surfaces can be very difficult to handle when trying to remove them to make way for a new building or construction area in general.
How to choose a hammer for your home?
Many people identify the hammer drill and the impact drill. However, these are two completely different tools in terms of function and principle of operation.
A hammer drill is first and foremost a drill with an auxiliary impact function. The principle of blow in the electric drill is mechanical, and the perforator realizes blows pneumatically. It is because of this that you can effortlessly make a hole in the concrete, stone, brick, or other composite or building materials with the help of a hammer drill. Agree that this is quite a useful and necessary skill in everyday life.
Working with a perforator is much faster than with an impact drill and requires virtually no effort on the part of the operator, which is not the case with a drill. In addition, it should always be remembered that the percussion function several times accelerates the wear and tear of the electric drill. Therefore, today, more and more home craftsmen are inclined to buy a perforator for domestic use.
“Which perforator to buy for home? How to choose a perforator?” – if you are now asking yourself these questions, then you are on the right page where you will get answers to all the most important questions related to buying a perforator.
In this article, you will learn how to choose a good household hammer, what technical parameters to focus on, and what to pay attention to in the first place. Depending on what degree of load and duration of work the tool is able to withstand, there are household perforators and professional perforators. The latter are heavyweights, with the highest possible power indicators. A professional hammer withstands the most intensive loads for quite a long time and is capable of working even in extreme conditions.
However, such perforators are expensive power tools that are really more appropriate at a construction site than in a closet or garage. Today, a very large number of manufacturers are letting in excellent models of household perforators: Black&Decker (USA), Bosch (Germany), DeWalt (USA), Makita (Japan), Maktec (Japan).
A wide range of models suggests that every customer will pick up a perforator with the necessary functionality. If you want to choose an inexpensive perforator for the home, pay attention to the models of the Maktec brand. Maktec is part of the Japanese corporation Makita and specializes in the production of inexpensive household power tools. If you do not have desire or ability to buy a tool of famous brand, but just need a workhorse, then choose among Chinese models. These budget-class power hammers are made in China, but they have excellent performance characteristics and are self-sufficient.
What is a perforator and how does it work?
A tool is an electric machine with a percussion mechanism and the ability to drill. It is versatile because it combines a number of features of a drill and a jackhammer. Multi-tasking has made the hammer indispensable in construction, repair, finishing, and other types of work. It is chosen for the home and professional spheres. And so that each user can find a suitable option, there is a conditional division into three classes by weight.
Lightweight – weigh no more than 4 kg and have a power of 400 to 800 watts. They are mainly used for domestic repair when you need to drill holes in concrete for dowels, subrocket jacks, junction boxes. You can fix the profile for drywall walls, hang shelves, mount plumbing fixtures, install switches and outlets. In percussion mode, you can chip tiles and remove tile adhesive.
- Medium – have a weight of up to 8 kg, and the power can reach 1000 watts. These models find use in the arsenal of masters of finishing, repair, laying communications, and electrical work. Great endurance and increased destructive power will help not only to perform the tasks typical for light perforators but also to punch through holes for pipes, prepare trenches for electrical wiring, remove old floor coverings.
- Heavy – exceed the weight of 8 kg and have power up to 2000 watts. Such models are used by professionals in dismantling works, major repairs, laying communications, removing materials. It is possible to perform holes with crowns with a diameter of over 100 mm, to chisel concrete in the openings, to drill natural stone. Of course, such tools have large dimensions. And to reduce vibration, manufacturers install dampers in the handles so that during prolonged work the user’s hands are not overstretched and the risk of tunnel syndrome development is reduced.
Depending on the class, models may differ in external and internal structure. Below we will consider it in detail
Conventionally, the internal stuffing of the perforator can be divided into two parts. The electrical, as in a drill, consists of the traditional components: a motor with rotor, stator and carbon brushes, a switch and built-in electronics. Let’s take a closer look at the mechanical part, where the percussion mechanism is located.
Types of the percussion mechanism
Electromechanical – requires the application of great force for impact, which means that high power of the motor is needed. The work is carried out by the impact of the eccentric on the lever spring, which moves the striker. Due to the recoil, the force of the blow increases and is transmitted to the tool. This variant is considered to be obsolete. Models with this mechanism are no longer available.
Electro-pneumatic – allows you to get high energy of the blow even with low power. This is the most popular mechanism for obtaining a blow, which is used by almost all manufacturers. But its implementation in different designs has differences. For example, a rolling bearing is used on lightweight models with a horizontal motor. Tools with an L-shaped design of the medium and heavy class are equipped with a crank mechanism.
Let’s consider the principle of operation of the electro-pneumatic type mechanism with a rolling bearing (Fig. 2). The motor generates a rotary action, which is fed through the rotor to the inner ring of the bearing. This causes the outer ring to vibrate. The following happens in the air space between the striker and the striker: the pressure decreases and increases, so that the tool in the cartridge starts to perform a reciprocating motion. This helps it to penetrate the hard substrate in drilling mode and in chisel mode.
Important technical characteristics of the rotary hammer
Ranges from 400 to 2000 W in different models depending on their class. For household works, it is enough 400 – 500 W. Although such models are used in the commercial sphere, for example, during the installation of suspended structures or the installation of plasterboard partitions. Tools that have to work every day with a large diameter tooling and destroy very strong bases, should have a power of over 1000 watts.
Can be from 1 to 20 J or even more. Your choice should be guided by the density of materials you will be working on. High impact force is needed to work with concrete, reinforced concrete, stone. But it will be destructive for fragile materials such as bricks and foam concrete. Cracks and chips can appear in them. Also, a small impact force perfectly suits for careful chipping of tiles and removal of a thin layer of tile adhesive.
Important: The impact force does not depend on the user’s effort or the amount of pressure applied to the tool. It is determined only by the power and weight of the specific model.
This is the number of blows per minute. Most models have the parameter regulated in the range from 0 to 4000 – 5000 beats per minute together with the rotational speed – all depends on the force of the pressure on the trigger. The frequency of blows in a perforator is lower than in a drill, and productivity is achieved due to the high impact force.
Affects the speed of the tool. If you plan to use the tool frequently for drilling, it makes sense to choose a model with a value of up to 2000 rpm. For drilling, a high speed is not needed, so many representatives of the professional class, it barely exceed 1000 rpm. It is worth noting that the rotation of the perforator is needed exclusively for the removal of sludge from the hole.
Number of drilling modes
2 modes – drilling and drilling with impact. This is quite enough if you have only to make holes.
3 modes – drilling, drilling with impact, and impact. This is a more versatile option, which is also useful for dismantling structures, chipping materials, removing coatings.
Maximum drilling diameter
Manufacturers specify different values for the same model, depending on the type of equipment and materials to be processed. It is customary to make a comparison according to the parameters for concrete processing. For example, the maximum diameter of drilling with a crown can be from 12 to 160 mm, and the drill – from 10 to 80 mm. If you need to perform holes for dowels and anchors, large values of diameter are not needed. And to prepare holes for communications, subrocket holders, junction boxes, you need a tool with the ability to work with drill bits with a diameter of over 100 mm.
Chuck type of a rotary hammer
Given the type of chuck, you will not make a mistake in the selection of equipment for your perforator. There are two main types.
- SDS-plus – installed mainly on the tools of the light class, weighing up to 4 kg. They are designed for mounting accessories with a shank diameter of 10 mm with two symmetrical slots.
- SDS-max – found in the models of medium and heavy class, which work with more intensive loads and require improved fixation of working tools. The shank for such chuck has three asymmetric slots and a diameter of 18 mm.
- There is another type of chuck – SDS-top. It is gradually becoming a thing of the past and is mostly installed on tools for high-impact loads. It has two asymmetrical slots and a diameter of 14 mm.
In the case of perforators, do not be guided by the usual rule “the lighter, the better. As mentioned at the beginning of the article, there is a division into classes just by weight, and the heaviest representatives are the most productive. Their destructive power makes it possible to carry out dismantling work, punch partitions, to widen openings. Therefore, models weighing more than 8 kg are used in major repairs, construction, road works. For domestic use, there is no need to buy a heavy and massive perforator, which will be difficult to handle. Tools of light class, weighing up to 4 kg, are an alternative to an impact drill and are used in home repair, finishing work, installation of plasterboard partitions, preparing the premises for repairs. The middle class is models in the weight category of 4 to 8 kg, among which you can find the ideal assistant for removing floor coverings, slotting channels, drilling holes for sub-rocket holes.
What is the difference between a hammer drill and a percussion drill?
As you know, not only a rotary hammer drill but also a drill can work in the drilling mode with impact. Some users believe that these tools can be interchangeable in some cases, since they are designed for processing hard substrates, such as concrete and brick. But they have different origins and specificity of impact, which ultimately affects the result. What is the difference between a perforator and a drill? By the fact that the latter has a percussion effect by means of a ratchet mechanism. This helps to distinguish several important differences in the formation of the blow.
What is better – a rotary hammer or a percussion drill?
There is no single answer to this question. It is a matter of the specifics of your work and the tasks to be performed. Stronger percussion puts the perforator on a step higher when working with solid bases – concrete, stone, reinforced concrete structures. The drill comes in handy for infrequent work with brick and concrete when you need to prepare places for installing dowels. It is also suitable for precise drilling of fragile and crumbly materials. For example, you can work with hollow brick when you need to fix a dowel in the wall without destroying the material (low impact force helps to maintain the cylindrical shape of the hole in the partition). High performance with hard materials drill can not be achieved, because the user will have to put a lot of pressure on the tool. Therefore, if in your work there are often foundations made of concrete, reinforced concrete, stone, clinker, and silicate bricks, it is better to give preference to a perforator. It also comes in handy for destroying bases, chipping materials, removing coatings.
Working modes of the hammer and suitable accessories
Not all models work in these three modes. There are dual-mode, which combine only drilling with impact and drilling. In fact, this is an improved version of the impact drill, designed for more intense loads. Although among powerful professional tools there are those that work without drilling (they only have drilling with impact and impact). Three-mode models are more versatile, and they fit not only drills, but also drills, blades, chisels, and drill bits. They can be used to remove tile, pick holes, chisel away at concrete, and remove floor coverings.
Areas of application
- Installing air conditioners
- Installation of plastic windows
- Building Maintenance
- Ensuring fire safety
- Carrying out electrical wiring
- Pipe laying
- Facade and roofing work
- Land improvement
- Built-in furniture assembly
- Erection of scenery and art objects
How do I use the punching machine?
Basic rules of operation
- Assume a confident working posture – try to avoid crowded spaces and hastily erected decks. If you will be working at height, make sure the step-ladder or scaffolding is secure.
- Always hold the hammer with both hands – the main handle and the auxiliary handle. The fact is that high power and torque when the drill jams in the material can cause backfire. Then the tool becomes uncontrollable. The safety clutch is only triggered when you hold the hammer with both hands on both handles.
- Work with good quality and undamaged accessories – this prevents the tool from jamming and also improves the quality of your work.
- Use protective equipment – splinters of concrete can get into your eyes, so wear goggles. Concrete dust is dangerous to the lungs and you should wear a respirator. Headphones will protect you from the noise of the hammer. Use gloves with anti-slip pads to keep your hands from slipping and the tool from falling out of your hands. All these means of protection should be with the master at all times.
- Keep your workplace in order – you should not trip over the scattered tools, and nothing unnecessary should not restrain your movements. You should also take care of a stable power source to connect your perforator – a working socket or an industrial extension cord.
How and what to grease the hammer?
The first thing to do before working with a hammer is to check the amount of grease in the gearbox. The presence of grease between the rubbing parts reduces heat, reduces friction and prevents premature wear. If your hammer is new, there is plenty of greases. During maintenance, the housing is disassembled to add grease. Some models, however, have a service window in the housing that can be opened with a key. The grease can be added there without disassembling the housing. Special compounds for perforators are used. A new tool does not need grease, but it is still better to buy it right away.
Select the composition
It is also necessary to lubricate the shanks of drills before inserting them into the chuck. This reduces the penetration of dust inside the tool and also increases the life of the chuck and percussion mechanism. Without lubrication, the rotating splines will wear out and the striker seals will wear out, resulting in a reduction in impact force. There is a wide choice of greases for drills, but it is better to take those recommended by the manufacturer of your tool. The grease is applied to the drill shank and the excess is removed with a rag after it is inserted in the chuck. It is also important that the auger is clean before the grease is applied. The biggest mistake is to take the auger with the remaining grease out of the chuck and put it in concrete dust, and then cover the shank with those crumbs with grease and put it back in the chuck. Concrete and grease give an abrasive paste that wears down the barrel faster than no grease at all.
Tip: It is recommended to check drill shanks after every 180 to 200 holes drilled. Clean off the dust with a dry cloth and apply new lubricant.
Working with a rotary hammer
According to the installed equipment and the tasks to be performed, select the desired mode – drilling, drilling with impact, or impact. They are marked on the body with the icons “drill”, “hammer and drill” and “hammer” respectively. If ceiling slabs are to be drilled, a dust cap is installed on the drill shank. It collects the flying drilling waste, which protects the chuck and prevents dust from entering the perforator barrel. In the percussion mode and drilling with impact, the standard SDS chuck is used. If you need to use drills and work without impact, you need to install a drill chuck.
How do I install a drill chuck on my rotary hammer?
To do this, you will need an adapter from SDS to drill chuck. It is a cylindrical part, on one side of which grooves are made for the SDS mount, and on the other side there is a thread (the most common diameter is 1/2 inch). To the threaded part is attached a drill chuck with a corresponding seating hole, and it is already possible to install drills for wood, metal, brick, ceramic.
How to drill with a perforator?
If you need to prepare channels for wiring or piping to the plumbing, an excellent helper for a grinder or grommet will be a perforator with a flat chisel. First, two parallel cuts are made along the planned line with a diamond disc. Stroborez allows you to perform this work in half the time than a grinder, as it cuts immediately with two circles. The material between the cutting lines should be selected with a flat chisel. If there is no possibility of pre-cutting the line groove and it will have a small length, you can cope with a hole punch with a channel chisel (Fig. 5). Channel bit set at a convenient angle to be able to walk along the line, and turn on the chisel mode. This option is applicable when local work is done, such as installing an additional socket in the kitchen or wiring to a built-in fan in the bathroom.
Do I need to cool the tool?
Punching holes in concrete does not require cooling of the working part of the tool. And drilling large diameter holes is done with diamond core bits designed to work dry. That’s why there’s no need for water.
Why do you need the reverse?
In rotary hammers, it is only needed to retrieve the auger that is stuck in the material. The reverse rotation makes it easier to get it out. It is important to remember the positions of the reversing switch. It happens that they forget to turn it off and begin to work in the impact mode (with the chisel installed it is not visible in what direction the rotation goes). In this case, the load on the perforator increases, and its electrical part can fail.
How to connect the tool to a vacuum cleaner?
Such a question arises when you need to work in already finished rooms and the formation of a large amount of dust is undesirable. For this purpose, the working part of the perforator is equipped with an attachment with a dust extraction, which is connected to the hose of a construction vacuum cleaner. This solution is used, for example, when installing air conditioners, assembling built-in furniture, performing additional outlets in the living space. But if in your work such situations do not occur often, you can use a construction tip: cut off the top of a plastic bottle with a bevel and make a slot on the side for the drill. By placing the beveled part against the wall and positioning the neck with the cap closed at the bottom, you can drill cleanly indoors and the dust will fall inside the bottle.
Tip: Don’t put pressure on the tool trying to increase the impact on the material. This will not help and instead may cause overloading. You should also take breaks to cool down the perforator and tooling. For example, for professional models, you should rest for at least 10 minutes after every 30 minutes of work.
Tips for maintenance and repair
A rotary hammer is under serious strain during work, so it needs proper care for long service life. Practice shows that even an expensive professional tool can be ruined before the warranty period expires if maintenance tips are neglected. On the contrary, an inexpensive household perforator can last for many years with careful and attentive use. Here are a few tips.
- Be sure to clean the housing after work. Especially pay attention to the ventilation holes. If dust gets clogged in them, air will not be able to pass to the motor and it will overheat. The cartridge and tooling should also be kept clean.
- Check the amount of grease in the gearbox regularly. Parts should not run dry. If you disassemble your hammer for maintenance or repair, check for grease and apply it to the parts as needed. Some models have a window in the housing where you can add grease without disassembling the housing. After the grease is applied, assemble the tool, plug it in, and let it run to distribute the grease between the parts.
- Do not wait until the brush unit is completely worn out. If you feel that the power of your rotary hammer has decreased or there is a spark in the header area, those are signals to replace the brushes. Many modern models have an indicator light to let you know. To replace the brushes, you have to remove the back of the hammer. However, some models have a cover on the housing through which you can quickly access the brushes without disassembling the housing. Remove the elements – they are replaced in pairs, even if the wear is uneven. Also along with this is sometimes the need to clean the manifold assembly, as graphite dust and fouling accumulates in it. But if you’re not sure you can do that, it’s better to call a service. New brushes are installed on the clean and dry manifold – preferably lapped closely (there is sandpaper on the manifold that smoothes the surface of the brushes). This will reduce sparking and help get the engine power it needs. On average, brushes last about 100 hours, sometimes more. It’s best to have spare ones in your toolbox so you can replace them quickly without disrupting your deadline.
Tip: If you are not sure that you can properly perform maintenance of the tool, contact the manufacturer’s service center. Doing repairs yourself is not recommended, especially if the perforator is under warranty. However, everyone should know the main symptoms in order to understand the cause of the malfunction.
Breakdowns and their causes
When you press the start button, the tool does not turn on? Most likely, there was a break in the circuit. You need to disassemble the electrical part of the housing and test the wiring with a multimeter. The cause may be a jammed rotor or broken armature.
Has the performance of the perforator dropped drastically?
In most cases, it is due to the wear of the striker seals in the barrel. You will have to disassemble the mechanical part of the body to assess the wear.
Is there excessive noise and vibration in operation? The bearings could be worn out or it is a matter of backlash or skewed gears.
Some repairs can be done by yourself, such as replacing the brushes or the striker seal. But if you need a more serious repair, such as replacing the armature, it is better to contact experts. Below we will give information on how you can repair the tool at home. But if you are not sure that you have enough knowledge and experience, it is better not to do it and trust the professionals.
Repair of a perforator with your own hands
If the warranty has expired, and you have no opportunity to go to a service center for a paid repair, you can try to fix the problem yourself. In such a case, it is important to know how to disassemble and reassemble the perforator correctly.
Disassembly of the mechanical part
Let’s say that the percussion mechanism began to work badly. In this case, it is not necessary to disassemble the entire tool – you only need to get to the mechanical part.
- Remove the mode switch by pressing and turning it to the stop. It is usually easy to remove from the socket.
- Remove the chuck. You can pick up the retaining ring with a flathead screwdriver. This is also useful for removing the washer, spring, and ball. Put all the small parts in the box.
- Wipe off the dust from the chuck mount with a clean rag or cloth to prevent abrasion from entering the tool.
- The gear cover is easily detached from the housing by loosening the screws. A Phillips screwdriver will come in handy.
It is easy to disassemble the percussion part into two to check the integrity and degree of wear of the elements. Compare with the diagram of the perforator. One of the vulnerable elements is the rubber on the striker. If the firing pin is loose and falls out of the barrel, the rubber is worn and needs to be replaced. It is an expandable material, which is easy to pick up in diameter and thickness. But if some metal part is damaged, you will have to order it from the service center.
Disassembly of the electrical part
One of the most serious problems is the breakage of the armature. This can happen due to worn brushes or improper use of the perforator. For example, when in shock mode, you forgot to disable reverse – the rotor shorted, which caused the armature to fail. It is necessary to replace it.
- In most models, to access the electrical part, it is sufficient to remove only the back cover, unscrewing a few screws with a screwdriver.
Then you should remove the brushes, picking them up with a flat screwdriver.
Remove the armature itself from the body.
Sometimes access to the electrical part of the tool is also required for other reasons: breakage of wires, breakage of the power button, etc. In some cases, you have to check this assembly with a voltage tester to find the damaged area.
Sometimes the cause of the failure is not clear. Then it is necessary to disassemble both parts, remove everything, remove grease, clean and find the breakage. For example, to get to the rotor, you need to separate the electrical part from the mechanical part by unscrewing the screws where they are connected. The rotor is easily removed by moving it toward you with a slight rocking motion. If it is necessary to remove the drunk bearing, it is enough to hook the bracket with a flat screwdriver – it can be easily unscrewed. The bearing itself is disassembled into components to diagnose their integrity. Another important point is the complete cleaning of grease and soot from all parts and the gearbox. This will help locate damage and even fragments of broken parts. For example, you may find broken rings or aluminum sleeves in the gearbox! If these accidentally fall between the rubbing parts, they can put them out of action. That’s why cleaning helps prevent these dangerous situations. And it is better to apply new grease to the parts immediately during assembly.
Assemble the tool in reverse order piece by piece – first, the parts must be assembled into blocks, and then they must be connected to each other. When attaching the rotor, you need to spin it slightly so that it engages inside. When installing the back cover of the perforator, you should be careful to get all the wires inside so as not to pinch them. You should not be in a hurry to screw all the screws to secure the case. First you need to make sure that the assembly is correct by twisting the chuck by hand. If it twists – everything is assembled correctly, you can fix the screws.
Tip: When disassembling the hammer, put the parts from the individual units in separate boxes, so as not to mix up anything when reassembling. You can also take pictures of the tool insides before complete disassembly. Then it will be easier to reassemble the elements without leaving anything unnecessary behind.
How to successfully choose a perforator?
In addition to the technical characteristics, there are a number of other points that are important to consider when choosing. So you will find the most suitable tool for your specific type of work and find out which features are worth overpaying for and which are not. To make it easier to understand, we decided to cite the most common questions from buyers and answer them.
An electric or cordless tool?
If there is electricity at the construction site and you don’t have to move around with a perforator often, the first option will be the best choice. You won’t have to worry about whether the battery charge is enough for the entire scope of work. Wireless models are used where it is impossible to connect to a socket, or you have to work at height, in cramped conditions, move along a building or fence. Modern cordless rotary hammers are not inferior to the network in performance, so the tasks cope with nothing worse, even in the professional sphere. But their operating time is limited by the battery charge. This issue is solved by the spare battery. While the dead battery is being recharged, you can continue working with the second battery. Cordless tools are often chosen by installers of windows, air conditioning, ventilation and other craftsmen who often have to travel to various sites where there may not be electricity.
What’s the difference between electronic and brush reversers?
The reverse is used to change the direction of rotation of the drill, which is necessary to easily remove it from the material. If the electronic system is used for this purpose, the position of the brushes does not change – they rub against the rotor, slowing it down. As a result, there is a loss of power and the brushes wear out faster. This way of switching is found on inexpensive household rotary hammers. The second option is reversing by turning the brushes. The power does not drop, and the brushes wear out less. True, the implementation of such a system requires a more complex layout of the tool’s internal parts, which means that the cost of the model goes up. It is reasonable to overpay for it if you choose a perforator for daily professional needs.
Why do you need a safety clutch? It works when the tool jams into the wall. For example, the cutting edge of the drill hits an obstacle as if slipping – it can be rebar or a metal beam. Without being able to pass straight, the drill deflects from the axis of rotation, until it jams. In this case, a clutch is triggered and prevents the drill from continuing. The system eliminates injury to the operator, which can happen with uncontrolled rotation of the perforator in the hands.
What kind of antivibration protection should there be? On simple domestic models, it either does not exist, or it is carried out by the simplest rubber inserts and seals. This is the so-called passive protection, which simply reduces fatigue and makes holding the tool more comfortable. Active protection is implemented in professional-grade, powerful, heavy drills that people work with all day. There is a counterweight with a spring inside the body to absorb vibration. The handle can be attached to the housing with spring-loaded joints. This reduces the transmission of vibration to the hands and reduces the risk of tunnel syndrome, occupational disease of many workers. If your work involves the daily use of a rotary hammer, do not skimp on buying a model with active vibration protection. Consider it an investment in your health.
What equipment is worth considering?
If this is your first perforator, choose a model with everything you need to get the job done. The basic equipment usually includes an additional side handle, the drilling depth limiter. Many manufacturers supplement the set with drills of the main running sizes, the adapter to the drill chuck, a case, grease, spare brushes, a key. For those who choose a tool to replace an old one, the set may not play a big role. After all, as a rule, all the necessary tools for work are already available, and there is no point in overpaying for them.
Popular models for home and professional work
In addition to those models that are listed in our review, we recommend paying attention to these models of rotary hammers:
- Makita HR 2475 – the workhorse of the finisher or master of electrical installation works. It has a safety clutch, electronic speed control, and reversing is done by turning the brushes. Also worth noting is the sturdy hammerhead and double protective insulation. This model has a rubberized handle and stops for a better grip, and the side handle can rotate to work in any position.
- Metabo KHE 2660 Quick is a classic three-mode rotary hammer with an S-automatic safety clutch and brush reverse. It will be an excellent addition to the arsenal of the repairman, drywall installer, air duct installer. The Metabo Marathon electric motor has patented protection against dust, which makes it possible to work in extreme conditions every day.
- Bosch GBH 18V-26 is a cordless tool with three operating modes. The main feature is the brushless motor, which is characterized by increased efficiency and excellent performance. The hammer is designed to work with a battery voltage of 18 V, but it is necessary to buy it separately. With a weight of 3 kg, the impact force reaches 2.6 J, which is comparable with the main models. The manufacturer has provided vibration protection, a kickback protection system, and electronic adjustment of the operating speed. Another advantage is the dust extraction system and the possibility to connect the connection unit to a vacuum cleaner.
- Bosch GBH 12-52 D is a dual-mode hammer drill with preset working speed. It can handle everything – from preparing dowel holes to chipping tiles and destroying concrete. The tool is especially good at chiseling. You can set the chisel to the right angle thanks to its 12 locking positions. Like all professional models, it has a safety clutch, accidental start protection, brush wear indication. However, there is no active vibration protection, so working non-stop for 8 hours a day will be tiring.
- DeWALT D25263K – heavy professional rotary hammer with SDS-max chuck, which is useful at the construction site, during road works, and major repairs. It has two modes and variable speed control. In addition to its high power and productivity, this model is characterized by state-of-the-art stuffing. It has a UTC system for absolute torque control: if the tool jams, it shuts off in fractions of a second. Active vibration protection inside the chassis and on the rear handle reduces the effects of vibrations on your hands. Another feature is the brush wear indicators that let you know when the brushes need replacing. This will exclude their complete wear and breakage of the anchor. The perforator is made in the Czech Republic, and the manufacturer gives a 3-year warranty on it.
Hammer Drills Price:
Hammer Drills Under 100$
- Bosch Single-Speed Hammer Drill
Hammer Drills Under 200$
- Makita Hammer Drill Kit
- DEWALT Hammer Drill
- ENEACRO Heavy Duty Rotary Hammer Drill