Table of contents:
- Design features of heavy rock drills and demolition hammers
Choosing a universal heavy puncher
- Rotary Hammer Makita HR4011C
- Rotary hammer DeWALT D 25600 K
- Rotary hammer HITACHI DH40MRY
- Rotary hammer Hilti TE 76-АТС
- Rotary hammer AEG PN 11 E
So, for example, the METABO company, which, despite its considerable age, did not have in its assortment heavy hammers and jackhammers, several years ago decided to start producing them. DeWALT, which is perceived by many as a manufacturer of quality tools for woodworking, is also actively promoting heavy impact equipment on the construction market. And this is no coincidence, since this particular technique brings the main income to both the manufacturer and the seller. And it's not about huge markups. This technique is constantly experiencing huge loads, it works "for wear and tear", and therefore requires increased attention from the service department. It couldn't be otherwise. This technique can be compared to a racing car, which can only show great results with excellent service.
Design features of heavy rock drills and demolition hammers
All manufacturers of heavy rock drills and jackhammers showed surprisingly rare unanimity in the choice of the attachment system for the working tool (chisel, drill). Most of the equipment is equipped with the SDS MAX mounting system. This system has been used for a long time, was originally used in jackhammers and has established itself as extremely reliable, resistant to overloads and constant vibration, transmitting impact energy as fully as possible. And this is very convenient for the end user of this technique, since there are simply no problems with the choice of consumables. You can choose products not only from different manufacturers, but also in different price categories.
However, you should not chase cheapness. Many consumables in the lower price range are simply not designed for use in today's high impact hammers and rock drills. Let's take a simple example. The DWT tool (DWT) has long been known to the Russian consumer. So, the DWT BH-1500 BMC perforator with an engine power of 1500 W has an impact force of 12 J.
At the same time, the AEG PN 11 E rotary hammer with a power of 1700 W has an impact energy of 27 J. Imagine what can happen to a drill shank of inadequate quality when the drill experiences a similar load during operation - it will simply be flattened in the barrel of such hammer drill and removing such a drill will be extremely problematic, most often it is simply impossible.
Usually, such cases end with the fact that builders have to pay for expensive repairs, which are associated with replacing the barrel of a hammer drill or a jackhammer. Information for reference: the cost of such a part is more than one hundred dollars, to this amount you need to add the cost of work to replace the part, and then you can calculate exactly how much it will cost us to save on consumables.
We have repeatedly come across information that our products, for one reason or another, cannot be sold in Europe. Noise level, increased vibrations, electrical noise generated during operation are some of the reasons why a refusal to supply products abroad comes. At the same time, European manufacturers have long been working within such a strict framework. So, for example, the latest changes that we could observe in the line of heavy rock drills and jackhammers were caused not only by the fact that manufacturers decided to independently introduce any innovations. It's just that the European Union has once again tightened the requirements for vibration that occurs when the mechanisms are operating.
It is thanks to such strict measures that are aimed at preserving the health and working capacity of the population that we have seen such "friendly" changes in all lines of heavy equipment. Anti-vibration handles, special shock-absorbing pads, and other devices that ultimately reduce vibration during operation to an acceptable level are widely used. It is these vibration damping systems that determine the subjective sensations of a person who has to work with a hammer drill. The workers are trying to convince the older tools that they were more effective because they said they felt the power with their hands. In fact, the workers paid with their health, and labor productivity was much lower.
Let's consider this using the example of the MAKITA perforator, which is popular among builders. The Makita HR 5001 C (HR5001C) SDS-MAX rotary hammer was produced for a long time without any special design changes.
And there was simply no need to introduce anything new into the design of this perforator, since this model of the tool turned out to be very successful, efficient, hardy (the perforator has been produced for more than 10 years) and maintainable. With an engine power of 1500 W, a mass of 10 kg, an impact force of 17.5 J, a cost of about 19,000 rubles, the Makita HR 5001 C hammer drill perfectly coped with any complex work. However, new standards forced manufacturers not to stand still, but to take more seriously the issues of safe work and ergonomics.
The Makita HR 5001 C punch was replaced by a whole line of new products, including the HR5210C punch, which, with a power of 1500 W, an impact force of 17.5 J, received additional protection from AVT vibration, which, however, to some extent affected the weight of the product … The weight of this rock drill increased slightly and amounted to 11.6 kg. What does this vibration damping system give and how does it work? The perforator has a piston mechanism, in which the piston constantly reciprocates, while striking the working tools (drill, chisel). A special weight was added to the design of the perforator - a dynamic counterweight, which, due to the movement in the direction opposite to the movement of the piston, compensates for the resulting vibrations. In combination with anti-vibration handles,With damping pads, this system allows you to successfully cope with the problem of vibration and meet the strict European standards.
But … As you know, you have to pay for everything. The cost of the Makita HR 5210 C hammer drill is about 23,000 rubles. Naturally, this is a rather significant increase in value. However, if we calculate how much treatment and rehabilitation of various industrial diseases costs for different states, it becomes clear that the introduction of such technologies is justified. And it's time to think for ourselves that our health is very expensive and needs to be protected. Another Japanese company, HITACHI, followed approximately the same path. Only such a system is called UVP (user vibration protection).
Some manufacturers are increasingly beginning to use liquid lubrication for rock drills and jackhammers. One of the first to use this type of lubricant was in rotary hammers from BOSCH. It may seem that this is quite difficult, since you have to pay more attention to the tightness of the case. In fact, this move is quite justified. Grease of any viscosity has the property of collecting at the lowest point of the gun body. One might argue that the same thing happens with liquid lubricants. The thing is that when it cools, ordinary grease thickens. The moment you start to work, not all parts and mechanisms of the hammer drill are properly lubricated. This is comparable to starting a car engine after a long period of inactivity. Not every user adheres to the recommendations,that before starting work, you need to turn on the tool without load for a short period of time. Especially for a long time, the lubricant is distributed over the entire percussion mechanism in the cold. As a result - increased wear and premature failure of the tool.
Liquid lubricant reaches all points much faster, which are lubricated during operation, in cold weather such lubricant thickens much less, it is distributed many times faster over the gearbox of the tool and thereby increases its resource. Moreover, during operation, the mechanisms of the tools become very hot.
A liquid lubricant cools the hammer hammer mechanism much better than a standard grease, which also helps to reduce wear.
The hammer drill body is not only about beautiful design. Effective cooling of all perforator mechanisms, resistance to mechanical stress (vibrations during operation, falls, shocks), protection of the operator not only from the mechanical effects of vibration on the body, but also from burns, electric shock. These are the main functions that the punch body performs. The plastic from which the bodies of perforators are made is able to withstand not only high temperatures, but also perfectly withstands all kinds of mechanical influences, thereby protecting the metal body of the product. There is a misconception that the punch body should not heat up during operation, that such heating of the body indicates a possible defect. This statement is not true. At the time of the impact, a large amount of energy is generated,including thermal. The temperature inside the impact mechanism can reach 600-800 degrees, and even higher in heavy jackhammers.
The metal housing of the gearbox, lubrication, ventilation of the electric motor allows you to effectively remove this heat and quickly cool the tool. It is the high temperatures that over time make the internal lubrication of the rock drill, rubber seals and seals unusable. For this reason, it is so important to replace it on time. Agree, we have no doubts that it is necessary to periodically change the oil in the car engine, to carry out maintenance of the entire percussion mechanism. Some manufacturers, for example Hitachi, began to manufacture the bodies of their heavy rock drills from light metal alloys, like the SDS-max Hitachi DH45MR rock drill.
This not only increases the strength of the tool, but also improves its cooling during operation. In addition, some manufacturers, for example, DeWALT, complete their products with a special extended handle, which greatly facilitates the work with such a heavy tool as the SDS MAX perforator. Moreover, in some models, such as the SDS-max DeWALT D25600K rotary hammer, it is possible to install an extended handle in the immediate vicinity of the main handle, where the product power button is located. This is very convenient when working on a horizontal surface, as it is more convenient for the operator to hold the tool.
Separately, it is worth remembering the delivery set of rotary hammers and jackhammers. Almost all equipment is supplied in special suitcases (metal or plastic), which are designed for storing and transporting tools. Nothing else is included in the kit, except that a rag for cleaning the tool and lubricant for the shanks of drills and chisels. An additional chisel may be supplied with the jackhammer. The fact is that the cost of consumables with SDS MAX shank is very high and this will certainly affect the cost of the entire kit. There may be such a situation that you simply don’t have to work with the drills that are included in the hammer drill. You may not need them because of the small, or vice versa, large diameter. All accessories you need to purchase separately.Sometimes tool makers arrange special promotions and complete their products with all sorts of accessories. This is a common marketing ploy. If you open the catalog of tools from any manufacturer, then you yourself will be able to make sure that the tool of this class is not completed with additional consumables.
Talking about different manufacturers and equipment, it would be wrong and not fair to forget about such a company as HILTI. This company is developing along a path that is completely different from that of other tool manufacturers. HILTI has removed all intermediaries from the producer-buyer chain. This has both positive and negative sides. Alas, it is simply impossible to grasp the immense construction market. Huge overhead costs fully affected the cost of this tool. If a consumer in a big city does not feel a particular problem with servicing this equipment, then construction teams from remote regions of the country are left alone with the problem of repair. There is even a joke about the term “lifetime warranty” used in HILTI tools supply contracts.
The builders say - "Hilty is broken - life is over." And there is some truth in this joke. There is no doubt that the Hilty company not only produces excellent tools, but also has unique warranty conditions, which consist in unconditional elimination of any breakdown within 2 years, limiting the cost of repairing the product. However, if the consumer carefully reads all these conditions, he will find some not entirely acceptable points that significantly limit the choice, for example, consumables. The manufacturer directly in the instructions indicates that the warranty applies to the product "if only original consumables and spare parts of the Hilty company were used."
But the most important factor that makes the buyer think is the cost of tools and consumables. When you are offered a tool that is several times more expensive than its direct competitors, then you should think about whether such costs are justified by all the offered service or not. Let's look at this with a simple example.
The HILTI TE 70 combined perforator costs about 98,500 rubles, while its direct competitor, the BOSCH GBH 7-46 DE Professional perforator, costs about 23,500 rubles.
Even if we assume that you will be given a discount of 30 - 40% of the cost of the product, then in any case, you can purchase 3 or 4 BOSH punchers or 1 HILTI puncher. Despite the fact that BOSCH currently provides a 3-year warranty for its products, I just do not know what kind of arguments need to be found in order to convince me of the advisability of purchasing such an expensive product as the HILTI instrument. There are no miracles, and eternal instruments are the same. The four rock drills clearly have to beat their competitor in terms of durability. And technical progress does not stand in one place. More and more sophisticated and high-quality tools appear. So the “lifelong” possession of any thing, albeit very high quality, is not such a rosy prospect. Moreover, the financial crisis appears to have affected Hilty as well.In the last year, some positions of tools have significantly dropped in price, and began to cost the same as competitive products. But do not forget that the cost of spare parts has remained the same. If a breakdown occurs and you are denied a guarantee, then you will fully experience all the "delights" of such an acquisition - the cost of repairs will unpleasantly surprise you. Another conclusion suggests itself - if today we can purchase the same product much cheaper (sometimes twice), then, most likely, we simply overpayed for this product to the manufacturer. Not a single manufacturer will trade at a loss.If a breakdown occurs and you are denied a guarantee, then you will fully experience all the "delights" of such an acquisition - the cost of repairs will unpleasantly surprise you. Another conclusion suggests itself - if today we can purchase the same product much cheaper (sometimes twice), then, most likely, we simply overpayed for this product to the manufacturer. Not a single manufacturer will trade at a loss.If a breakdown occurs and you are denied a guarantee, then you will fully experience all the "delights" of such an acquisition - the cost of repairs will unpleasantly surprise you. Another conclusion suggests itself - if today we can purchase the same product much cheaper (sometimes twice), then, most likely, we simply overpayed for this product to the manufacturer. Not a single manufacturer will trade at a loss.
When choosing a tool, special attention should be paid to what functions you intend to use. If you have work to destroy any structures (walls, floors, foundations), then, without even thinking, take a jackhammer. The thing is that the performance of a hammer drill in direct impact mode is much lower than that of a similar class of jackhammer. Let's take a look at the weakest percussion instruments with the SDS MAX cartridge. The BOSCH GSH 5 CE Professional jackhammer with an impact energy of 13 J has a capacity for removing medium-hard concrete about 190 kg / h, while a similar model of the BOSCH GBH 5-40 DCE Professional perforator with an impact energy of 11 J has a excavation of medium-hard concrete about 140 kg / h.If we compare the stronger instrument samples, this performance difference is even more noticeable. Do not forget that for the hammer drill, the direct impact mode without drilling is declared by all manufacturers as an additional, not a basic option.
Choosing a universal heavy puncher
Considering the rather high cost of the equipment, which is equipped with the SDS MAX keyless chuck, not every construction team, or craftsmen who are engaged in repair and construction, can afford to have two units of such equipment - a perforator and a jackhammer. You have to choose something universal. It is for this reason that a puncher is chosen. All heavy rock drills can be roughly divided into 3 groups:
- weighing about 5 kg;
- weighing about 7kg;
- weighing about 11 kg
Small construction crews prefer to use rock drills weighing about 7 kg because they are not much inferior to heavy rock drills and at the same time cost much less. These perforators do an excellent job with such tasks as installing air conditioners (split systems), laying wiring and pipes, making openings in the walls. In addition, hammer drills weighing up to 7 kg allow the use of a special adapter SDS-max - SDS +. This adapter will allow you to use in your work not only drills with SDS-max shank, but also in the absence of the required diameter, use drills for light hammer drills. It is not only convenient in work, but also significantly saves you money.
Let's take a look at several SDS MAX rock drills and compare their performance. As an example, we will take rotary hammers with approximately the same characteristics, warranty conditions provided by the manufacturer - Makita HR4011C hammer drill, DeWALT D 25600 K hammer drill, HITACHI DH40MRY hammer drill. But, in addition to this, we add to the comparative analysis the Hilti TE 76-АТС perforator and the AEG PN 11 E heavy perforator. This will allow us to fully consider all the advantages of the line of medium perforators weighing about 7 kg.
Rotary Hammer Makita HR4011C
The Makita HR4011C hammer drill is a fairly recent development. The tool has an extremely high performance, with 1100 W motor power and 9.5 J impact energy, this rock drill allows you to drill holes up to 45 mm in diameter, as well as work with hollow core bits with a diameter of 105 mm.
The hammer drill is equipped with an anti-vibration system, which we have already talked about (AVT), has an electronic engine speed controller (from 235 to 480 rpm), which allows it to produce from 1350 to 2750 beats per minute. The rotary hammer has a built-in service display system that will promptly notify you of worn carbon brushes or damaged electrical cables. The metal gearbox is reliably protected by a wear-resistant plastic housing with integrated metal inserts for even greater strength. The weight of this perforator is 6.3 kg, the cost is about 18,300 rubles. Manufacturer's warranty - 12 months.
Rotary hammer DeWALT D 25600 K
Rotary hammer DeWALT D 25600 K attracts attention with the modified gear housing. These changes were made to the design of the rock drill in order to reduce the time for service. To carry out such maintenance, it is not necessary to remove the protective plastic case of the tool.
This innovation also improved the cooling of the rock drill during production. The rock drill has an extended handle that can be attached to the rear of the rock drill for more convenient operation. The power of the tool is 1150 W and the impact energy is 10 J. The rotations of this hammer are electronically controlled in the range from 140 to 280 rpm. The hammer drill does not have an active vibration damping system, but it is equipped with special shock-absorbing pads. The display system will promptly inform the operator about the need for service and replacement of brushes. The rotary hammer is designed for easy access to the carbon brushes.
The hammer drill allows you to drill holes up to 45 mm in diameter. The weight of this tool is about 6.8 kg. There is one more pleasant surprise. This perforator, with its cost of about 19,500 rubles, in the promotional version is equipped with a special large-capacity suitcase and a DeWALT D 28942 angle grinder with a power of 2.2 kW and a circle diameter of 230 mm. Such gifts from the manufacturer are always a pleasant and useful addition to the basic tool. Moreover, the cost of such a gift is about 5500 rubles.
Rotary hammer HITACHI DH40MRY
The HITACHI DH40MRY rotary hammer is close in its technical characteristics to those products that we have considered above. The modern unique design of the case makes it stand out from the offered range of instruments.
Despite the fact that the engine power is only 950 W, the impact energy of this rock drill is equal to 10.5 J. The rock drill is equipped with a Hitachi anti-vibration system and has excellent engine protection from small debris. Electronic regulation of engine speed (from 240 to 480 rpm) allows the hammer to strike at a frequency of 1320 to 2650 beats per minute. Maximum drilling diameter 40 mm, hollow drill bits can drill holes up to 105 mm. The cost of this tool is about 16,500 rubles.
Rotary hammer Hilti TE 76-АТС
The Hilti TE 76-АТС perforator can rightfully be attributed to the tools of the middle price category. The cost of this product is about 45,000 rubles. The hammer drill is equipped with a powerful motor (1400 W), has a special active torque control system, which avoids injury to the operator when the drill gets jammed.
The drilling diameter is 40 mm, with hollow crowns up to 150 mm. The impact energy is 8.3 J. The weight of this rock drill is 7.9 kg. The perforator is equipped with a power mode switch, has anti-vibration handles, an indicator that will notify about the wear of carbon brushes.
Rotary hammer AEG PN 11 E
The AEG PN 11 E rotary hammer does not belong to the category of medium rotary hammers. We decided to give the characteristics of this tool as an example so that you can clearly see the differences between medium and heavy rock drills. The AEG PN 11 E hammer drill is a fairly recent development of a well-known German company.
Its main difference from other tools is the linear arrangement of the motor, which makes this rotary hammer very convenient for use in confined spaces when performing work in the horizontal plane. The engine power of this rotary hammer is 1700 W, but its impact energy is 27 J. Thanks to such a huge impact force, this rotary hammer has simply excellent performance. Rotary hammer weight 11.8 kg. The cost of this tool is about 26,500 rubles. Agree that in terms of its parameters, this perforator is many times superior to tools of the middle "weight" category and at the same time has a very reasonable price.
Having weighed all the positive and negative sides, we decided to choose the DeWALT D 25600 K perforator for a small construction team. There are several reasons for this decision. First of all, the complete set of this tool plays an important role. Receiving an angle grinder as a gift, for which there is always work to be done at the construction site, is a weighty argument in favor of this tool. In addition, this rotary hammer has excellent technical characteristics, is relatively light and easy to use, has high impact energy and a sufficiently powerful motor. There is no doubt about the quality of the DeWALT brand products. Recently, the DeWALT company attaches great importance to the service of its tools, carries out various promotions,thanks to which users of DeWALT tools can significantly save their funds.
I would like to note that we only give recommendations based on personal experience of using the tools. The choice of tool or brand is your right. We wish you to make a good choice and safe work for you.