DIY repair recommendations
Sometimes it becomes necessary to replace the gearbox. To begin with, you should evaluate the so-called contact spot. It will show how much the gears are worn out. In advance, the device is freed from the old lubricant. Having removed the gearbox cover, the stator housing is released, and then the rotor, but it must be borne in mind that the consequences of errors can be very bad and it is better to turn to professionals.
In order for the rotor collector to work for a long time, it is necessary to use high-quality carbon electric brushes. They must be displayed in accordance with the instructions. The minimum lamella length is 0.8 cm. If it turns out to be less, the brush should be changed immediately. It is because of the violation of this rule that many problems arise.
Additional details and models
For the Zubr angle grinder, it is recommended to use disc-type brushes made of nylon
Attention: it is better to purchase a replacement part from the same manufacturer in order to be guaranteed to avoid problems. It is very convenient to use the device with the adjustment of the speed of rotation of the disk
Almost all models of the company (including the Master UShM-125-1100 TM3) are equipped with an electronic speed controller. This version also features:
- increased smoothness of start;
- vibration handle;
- high quality flange;
- quick-clamping nut of the SDS format;
- prevention of accidental launch;
- the possibility of processing concrete and natural stone.
If we compare this version with the "Professional USHM-P125-1400 EPST" typewriter, it becomes obvious that the second option is somewhat more powerful (1400 W versus 1100). It is equipped with disks with a diameter of 12.5 cm. The developers took care of the smooth start and the ability to withstand stable rpm under load. Product weight is 3.5 kg. The twisting speed of the working part varies from 3000 to 9500 revolutions per minute.
The small, lightweight grinder of the ZUSHM-115–720 modification is no worse than the battery models. The device is optimized for working in confined spaces.
Despite the limited power (720 W), the grinder is capable of developing revs up to 11000. To remove the casing, you do not have to use additional devices. The carbon brushes in the rotor manifold are switched off if necessary. Thanks to the use of an aluminum alloy in the manufacture of the case, a decent heat dissipation is provided. The working circumference reaches 11.5 cm.
For the ZUSHM-125-950 model, the disk rotation speed is not increased. But its diameter is 1 cm larger. If necessary, auxiliary handles are placed on the left and right. As expected, protection against dust penetration into key components is provided.
Using this angle grinder, you can process:
- I-beams and brands;
- pipes;
- rods;
- strip metal;
- welds;
- ready-made metal products of any shape.
Which firm grinder is better to choose
Answering the question: which grinder is better, buyers divided the votes, giving equal preference to European and Russian manufacturers. Experts noted that this is true, since both sides deserve attention, and the brands presented in the TOP 2020 have a good reputation. To familiarize the readers, we have collected brief characteristics for each brand:
- De Walt is a US company founded in 1922 that manufactures power tools, accessories and workwear, has manufacturing facilities in several countries, and is the fastest growing manufacturer of power tools in the world.
- Bison is a Russian trade mark producing plumbing fixtures, electronics, tools. It manufactures household and industrial goods, offering customers a wide range of products. The company has service centers throughout Russia.
- Military is a relatively young brand from Germany.It produces exclusively electrical goods, assembling them at factories in the PRC according to international quality standards. Each batch of instruments is thoroughly tested.
- Interskol is a Russian company founded in 2004. It has a large network of equipment repair service centers, a design bureau and an engineering center where power tools are created.
- Whirlwind is a trade mark of electrical equipment, founded in 1974 and is quite popular and has a large industrial network that produces goods for household and professional use.
- Elitech is another Russian brand selling power tools and garden equipment. The assortment of the company includes more than 300 models of various equipment and is constantly updated.
- Hammer is a large German power tool holding company. It has production facilities in China, where the assembly of power, measuring and garden equipment from high-quality raw materials takes place using patented technologies.
- Makita is a well-known manufacturer from Japan, founded in 1915. The range of the company includes more than 1000 items of household and professional power tools, at average prices.
- Bort is a trademark from Germany, part of the SBM group corporation. For more than 20 years it has been producing electronics and repair equipment, providing a large guarantee for each piece of equipment.
- Metabo is another brand from Germany, created in 1923. Thanks to unique engineering developments, the company annually produces innovative power tools at affordable prices.
- Bosch is a world famous brand, founded in 1886, produces power tools, household appliances and garden products, has many subsidiaries. All Bosch products are rigorously tested and meet quality standards.
One of the most common problems
We are talking about the so-called disc beating. It usually does not appear at idle speed. A common cause of the problem is the shift of the gearbox involved in the bevel gear. It can also be assumed that the rotor of the electric motor was poorly balanced at the factory. Another likely source of vibration is problems within the gearbox itself; additionally, it is worth checking the gear teeth, burrs and chips that appear on them.
In the absence of such defects, the quality of the mounting flanges must be checked. It is not always possible to notice deviations from the norm visually. Sometimes it is only after replacing the flanges with new ones that it is discovered that the reason was precisely in them. The smallest, subtle irregularities can appear both inside the flanges (where they are mounted on the shaft), and in the area where the steel washer is attached. If these measures do not help, you should immediately contact the professionals.
Which manufacturer is better
To understand this, it is necessary to compare the grinders of the Zubr and Interskol brands. Both firms operate in the middle and low price ranges, supply household and professional equipment for various jobs. Interskol has production facilities not only in Russia, but also in China and even in Spain. Components supplied from abroad are actively used at the Russian enterprises of the company.
Important: some products of this brand are made at partner enterprises in various countries.
All Zubr grinding machines are manufactured in China. At home, the products of both manufacturers show their best side. A more precise choice between them can be made only when the purpose of using the tool is clear.
