In the segment of angle grinders (USM) todayyou can find models for a variety of tasks. Major manufacturers of the "Bosch" and "Makita" level produce modifications with efficient functionality and ergonomic means of setting performance parameters. One of the last and most successful optional additions to the technology of this kind is the adjustment of the rotational speed of the disc. Models with this capability are distinguished by their versatility in use and increased convenience for the operator. At the same time, the USM with speed control is presented in different versions, so before buying it is worth to familiarize yourself with the market offers in advance.
Unlike traditional models without the possibilityadjusting the speed of the cutting element, such "grinders" enable more precise selection of operating parameters. In particular, the rotational speed control is effective if it is required to serve different quality materials in one work area. So, in working with metal, the operator applies a frequency in the range of 2-3 thousand rpm, and the stone is optimally grinded and cut at a speed of 7 thousand rpm.
При этом не всегда о высоком качестве Angle grinding machine is indicated by the highest frequency setting limit. For example, the ESM with a speed control in the range of 2-6 thousand rpm can also be effective in processing wood and plastic. Compensate material even manufacturers do not recommend to adjust due to the negative impact on the working equipment.
The implementation of the speed control system is largelydepends on two parameters - the diameter of the working disk and the power of the tool. As for the size of the nozzles, they vary from 115 to 180 mm. Typical model of the USM 125 with speed control allows working at a frequency of 3 to 10 thousand rpm. But as the diameter of the disk increases, the corridor of adjusting the "Bulgarian" for the revolutions is also reduced. For example, a technique equipped with 180-mm discs rarely overcomes the limit of 8,000 rpm. Another thing is that the power potential in the form of capacity can support this level.
In household models,exceeds 1500 watts. Usually this category is represented by 1200 watts, designed for working with small format disks. It can be the same USM 125 with speed control, which will allow surface processing of the stone, cut the thin metal and gently grind the wood. A more productive technique with a power of about 3000 watts is not only equipped with large disks, but also characterized by high performance - up to 5 hours a day with short breaks.
To the German manufacturer it is possible with confidenceTo apply for expensive high-power power tools, but in this case the greater interest is caused by the compact model GWS 850 CE. As the users note, the "Bosch" Ushm with speed control in this performance is favorably characterized by balanced functionality and structural ergonomics. Power 850 W does not allow to work effectively with large volumes of stone and metal structures, but grinding, mopping and quartz this "Bulgarian" performs quite well.
As for the turnover itself, the range is from 2.8up to 11 thousand rpm makes the model almost universal from the point of view of everyday use. Although the manufacturer himself positions the USM with the Bosch speed adjustment in the GWS 850 version as professional, the specialists still do not recommend purchasing it for solving complex problems in which high power and endurance of the tool are required.
Эта модель имеет много схожего с предыдущим apparatus, but there are significant differences. First of all, users point to the power potential, which is already 1400 watts. It would seem that this is enough for a full-fledged work with the stone and metals, but the manufacturer still claims the machine as a grinding machine. Of course, the "Makita" echmy with speed control in modification 9565 CV can be used also in work with solid materials, but do not forget about structural limitations. But with respect to ergonomics, the model has practically no complaints. The Japanese also provided a comfortable handle with a rubberized lining, and an anti-vibration system, as well as an enhanced dustproof function.
Another representative of the compact segment"Bulgarians", but already domestic production. Users of the model note its good working properties, the reliability of the design, the availability of ergonomic adjusting devices and affordable cost. So, if the German and Japanese models cost an average of 6-8 thousand rubles, then Interskol with a speed regulation in this version is estimated at 5-6 thousand. At the same time, the operating characteristics are generally similar to foreign devices.
If previous models represent a segmentlow-power and medium-sized angle grinders, the development of WEA 17-125 belongs to the high-power class. The power potential of this angle grinder with speed control is 1700 W, which allows high-quality processing of stones and thick metal structures. But even the power is not interesting this version.
As the owners of the instrument say, in itpractically all modern technological solutions for "Bulgarians" were concentrated. In this list, users identify the possibility of stable support of revolutions at high load, effective vibration damping, semi-automatic replacement of rigging, etc. True, the cost, which is available in the Russian market of "Makita" USM with speed control in the performance of WEA 17-125 . For it will have to pay the amount of 11-12 thousand.
Functionality of the power tool andoptional features - those characteristics, which first of all pay attention to buyers. But, not all of the proposed technologies are really useful in practical application. An example of the effective use of additional options just shows the USM with speed control. Reviews of such machines note that the ability to adjust the rotation speed of the disk not only saves time for performing work operations, but also improves the quality of the result. Another question is that different models provide for their own range of adjustments, suitable for the corresponding set of operations. Therefore, in addition to the very possibility of adjusting the revolutions when choosing a "grinder", it is important to take into account also the engine power and the maximum diameter of the disk - these parameters precisely determine the range at which the operator can choose the optimum operating frequency.
