Active development and emergence of newbuilding materials contributed to improving the performance of responsible structures, finishing coatings, functional parts, etc. At the same time, traditional materials do not lose their popularity, keeping in many segments the leading positions. This applies to concrete, the strength of which, coupled with an affordable price, determines its wide relevance.
Of course, he also has shortcomings thatalso expressed by the complexity of machining. Especially for solving such problems, a concrete grinder with different technical and operational parameters is designed. In particular, it is used for accurate cleaning of all kinds of notches and surfaces on the target surface.
Where is the tool used?
The main task of such devices is toimproving the aesthetic appearance of solid coatings. The main directions of their use are industry, civil and private construction. An important feature of this type of grinding machine is maneuverability and mobility. Manual design also provides the possibility of surface treatment in hard-to-reach places - the efficiency of solving such operations will be influenced by the dimensions of the particular model and its mass.
It is worth noting and the versatility of the tool inwork plan with a wide range of materials. For example, the grinder for concrete in Bosch modification GBR 15 CA successfully cleans the mineral building materials, including marble, artificial stone, seamless liquid screeds, etc. As for the defects being removed, these may be glue residues, old paint, unevenness after seized nails and other defects.
The device of the grinder
The main components of the instrument includegearbox, electric motor, chassis, traverse with runners and hull handle. Depending on the specific application, the sanding machine may have one or more landing links for mounting the abrasive material. An important optional-structural addition is the dust extractor. Even inexpensive modifications of the tool have a special branch pipe, through which you can connect a construction vacuum cleaner. Since hand grinders for concrete allow direct emission of dust wastes in the work area, the airway of the master will require special protection from harmful dust. On the one hand, the amount of waste minimizes the dust collector, and on the other hand it will not be superfluous to use a respirator for protection. By the way, some models also have additional physical protection in the form of a casing with a screen in the body.
Specifications
Concrete covers and structures requirethe use of a powerful tool, so the engine's capabilities come first when choosing a specific version. The average range for this parameter is 1000-1500 watts. Accordingly, this is the average distance from household models to semi or professional. The power potential of the unit will affect the speed of rotation of the working element, which will affect the quality of grinding. Therefore, the following significant characteristic is reflected in the number of revolutions. On average, it is 0-9000 rpm. This means that the grinder for concrete can work with rough surfaces, and with delicate coatings in the form of screeds, which require fine adjustment at high speeds. In this case, as practice shows, more important is not even the maximum speed of rotation, but the ability to adjust the frequency to certain indicators - it is this function that makes the tool a universal grinder.
From the point of view of ergonomics, the massand dimensions. Light and bright device will allow you to work for a long time without overloading your hands. On the contrary, a heavy model will quickly lead to fatigue, although the performance in this case will be higher. By weight, the range of values varies from 2 to 3 kg.
Tooling characteristics
Abrasives for grinders represent a wideassortment of consumables, differing in size and purpose. In this case, the most common are two types of equipment - with sizes 125 and 225 mm. The grinding operation is performed with wear-resistant corundum, carbide-silicon and diamond disks. The separation also passes by the degree of hardness and granularity. If the marking indicates a high level of grain (grades 100-120), this means the suitability of the consumables for fine processing.
Coarse-grained disks, in contrast, are designed forremoval of thick layers from the surface. In addition, the grinder for concrete can use different abrasive wheels for the device. The same diamond products can be solid and segmented. Due to the presence of grooves, models of the second type not only have a more effective mechanical effect, but also create channels for air circulation, which makes it possible to cool both the consuming device and the instrument itself during the operation.
Varieties of models
Concrete and other solid surfaces can begrinders of different types. They can differ in terms of the structural device, the power system, the nature of the mechanical abrasive action, etc. Angular and eccentric models are most often used. In the first case, the design is based on a narrow cylindrical body, which smoothly passes into the part with a lock for the working tooling. Additional support for the enclosure can be provided with an attachable side handle. As a functional body, abrasive wheels are used. Eccentric models differ in that the fastening mechanism is realized not in a separate external part of the housing, but is directly integrated into the base of the structure. This makes it possible to effect in the course of work not only by rotating the disc, but also by changing the clamping force.
Soft processing is performed by models with a D-shapeddesign, as a tooling of which are used foam rubber, fur and felt circles. It is already a polishing grinder for concrete, working at a reduced speed. It also provides for a more delicate adjustment of the intensity of rotation in such an instrument, which makes it possible to fine-tune the apparatus for optimal operating conditions.
Functional provision
The quality of the result and the convenience of the workflow for the user is affected by the set of instrument functions. What should be considered in this parameter? The entire option can be divided into three groups:
- Ergonomic additions. This category of functions includes the ability to adjust the speed, smooth start, maintain maximum speed, and so on.
- Protective systems.These are the means by which overloads and overheating of the instrument are avoided. A high-tech concrete grinder can automatically switch off if the engine is running for a long time at the limit of the permissible potential. There are also mechanisms to prevent accidental activation, jamming of rigging and strong vibrations.
- Auxiliary devices. To the additional structural devices can be attributed the same side grips, dust collectors, shrouds, etc.
Comments about the model Bosch GBR 15 CA
One of the most powerful devices of the segment,having a capacity of 1500 watts and working with disks with a diameter of 125 mm. The model provides a function of maintaining a constant speed under high load, a soft engine start and a branch pipe for connecting a construction pump. Although there is no special protection against engine overheating, users note that even at peak speeds the filling is heated uncritically.
The most important advantage of the grinder for concrete Bosch GBR 15 CA is called productivity. In particular, it can be a careful treatment of 40-50 m2 for a full working day.Serious drawbacks include only the price tag of 27 thousand rubles. But taking into account the quality of the element base, the absence of strong vibrations and, in general, belonging to the professional class, this sum justifies itself.
Reviews of the model Makita PW 5000 CH
In this model, the emphasis is on a wide range ofoperations and polishing the concrete surface by the type of "wet" abrasive action. The power of the tool is 900 W, and the number of revolutions varies from 2000 to 4000. The reviews note that the unit copes well with the basic tasks of fine stripping of concrete and mosaic surfaces, leaving a minimum of dirt and dust.
In terms of minuses, many point to an insufficienttightness of the shell. So, with long working sessions, water can penetrate into the engine. For grinders for concrete, the price of which is about 17 thousand rubles, this is a significant flaw.
Reviews about the model МШУ-125 / 1400Э "Интерскол"
Angle grinder of domestic production,which is a budget solution for domestic needs. The device has rather high power (1400 W) and many useful functions, but in terms of overall quality it is not the best option. As the owners say, the grinder for concrete "Interskol" of this version is equipped with small deformation consumables. This applies to the polishing wheel, in which the villi are curved, which in itself is not suitable for delicate operations. Technical power filling at high power also does not cope with long working sessions due to rapid heating and overload.
Homemade Sanding Machine
For the independent manufacture of thistool will need an electric motor (from household appliances), a wooden frame, electrical accessories, fasteners and a power source. To the motor on the shaft, it is also necessary to attach the disk fixing unit like the usual ears. Next, the power unit is attached to a wooden frame, which will ensure the correct position of the tool on the surface. In the same wooden structure, it is necessary to provide a niche for a battery, the energy capacity of which is sufficient for feeding a medium-sized grinder for concrete.
With your own hands, you canmake and ergonomic additions in the form of handles, wheels, protective screens, etc. For this you can use metal profiles, pieces of pipe and sheet metal.
Conclusion
Approaches to ennobling the appearance of concretesurfaces can be different. The choice of this or that technical means for solving similar problems is determined by the state of the target area. For example, grinders for concrete "Bosch" with a capacity of 1500 W are optimally suited for regular cleaning of rough freshly filled screeds. A powerful and durable unit will also provide an equalization effect - you only need to select the optimum consumable with sufficient granularity.
Another approach is suggested by developers of low-powerpolishing machines. It is recommended to use them at the final stage of preparing the surface for decorative decoration, when it is required to get rid of small defects in the coating.
