External processing of the surfaces of building materials or decorative cladding often requires not so much intense abrasive impact as precision and accuracy. It is an ergonomic design that can become the key to high-quality finishing of the coating to the required characteristics. In the segment of hand tools of this type, the most worthy option is a straight grinder, the body of which differs in a bottle-shaped form. The simple device of the unit does not at all limit the scope of its application. Depending on the power filling, such devices can be used both in everyday life and in solving professional problems.
Straight Grinder General
In practice, the feature of this machine is manifested in the ability to perform processing in hard-to-reach places. The basis of the apparatus is the case in which the power filling is enclosed. In fact, the main bottle part also acts as a handle, which saves on additional components. Although, depending on the version, direct pneumatic grinders can be equipped with additional handles that facilitate working manipulations. As accessories, conical and finger grinding discs are used, and if necessary, the user can complete the device with mills.
As for the application, the capabilities of the device are quite enough for polishing, engraving and cleaning of problem areas. For example, a straight grinder can be a good helper in the process of inserting a lock into an iron door or when processing welds.
Main characteristics
The machine does not apply to high-power electrical equipment, so when choosing, special attention should be paid to the power filling of the device. If the device will be used for typical operations of engraving and grinding, then the optimal power indicator will be 600-800 watts. However, universal productive devices of this type have a higher power potential. In particular, the direct Rebir grinder in the TSM1-150 modification provides 2000 W recoil. At the same time, it is worth paying attention to equipment - the diameter of the working disk is 150 mm. The performance is affected by the number of revolutions. The frequency range on average varies from 10 to 15 thousand rpm. Some modifications also include the possibility of regulating the rotation speed depending on the characteristics of the processed material.
Model Bosch GGS 28 LC
This unit is part of a series of professional grinders, with a small power of 650 watts. Despite the modest engine, the device can effectively cope with the cleaning of problem metal surfaces. It is the balanced technical base that ensures the performance of precise operations. The high frequency range also contributes to quality work. Depending on the complexity of the work, the Bosch direct grinder can provide speeds from 10 to 20 thousand rpm. In order to protect the operator, the developers of the model provided the KickBack Stop system in the design. If a random lock occurs, the mechanism will stop automatically.
The German apparatus is also distinguished by the availability of modern controls. For example, thanks to the convenient slide switch, the operator can easily activate the operating modes. In addition, the direct grinding machine in the GGS 28 LC version is provided with a ventilation system to cool the power plant and prevent its overheating.
Device Makita GD0600
The Japanese manufacturer also offers a model from the professional segment that can be used for processing metal, glass, wood, plastic and other materials. At the same time, the engine in this version also does not indulge in power - this figure is only 400 watts. But, as practice shows, to perform accurate and accurate operations, excessive performance is not required. As for the equipment, the Makita direct grinder can be provided with working elements with a diameter of 6 mm. Installation is carried out in a special collet, after which it is necessary to clamp the nut with a 17 mm wrench. As in the case of the "Bosch", the Japanese have provided several protective systems whose function is aimed at protecting the engine from damage and overvoltage. In the process, the user can count on a high speed - about 25 thousand rpm. This is enough for stripping metal, and for confident wood processing.
Compact machine GE 710 from Metabo
The designers of Metabo have successfully used a combination of a fairly powerful engine and small-sized design. As a result, the apparatus weighing 1.4 kg received a power plant for 710 watts. Accordingly, the operator is able to efficiently process virtually any surface. In case of long sessions, the creators provided Vario-Constamatic technology - this is a kind of operating mode in which the device stably maintains high rotation rates at a constant level. The grinder was not direct in the GE 710 modification and without speed adjustment capabilities. The function of the engine allows you to control a smooth adjustment, with which the user selects the optimal processing parameters. In this case, the maximum frequency is 34 thousand rpm.
Conclusion
High power of a power tool is not always a paramount characteristic, on which the effectiveness and quality of the result depend. This is confirmed by the direct grinder, the very concept of which orientes the work process to the accuracy of the operation. Nevertheless, in the professional category, high-performance devices intended for rough cleaning of metal surfaces are often found. If maneuverability and accuracy come to the fore, then it is better to turn to low-speed, but functional models.