Ushm (Bulgarian) "Interskol" USM-125 / 1100E: scheme, reviews

In the household and in industrial production, it is often necessary to cut and grind metal, stone or other products made of hard materials. Very effective for these purposes is a power tool such as the Bulgarian "Interskol" USMM-125 / 1100E.

What is this tool?

Angle grinder "Interskol" Ushm-125 / 1100E is an electronic device. In everyday life it is often referred to as the Bulgarian and used to work with iron, stone, concrete and other materials. "Interskol" Ushm-125 / 1100E - angle grinder, using nozzles with a diameter of 125 mm, a power of 1100 watts. It is a product of the Russian company Interskol. Work with a Bulgarian is not limited to cutting. This electrical device can also, if necessary, grind and polish the surface of the products. A wide versatility in application is possible due to the design features and technical capabilities of the USM.

The Bulgarian "Interskol" Ushm-125 / 1100E. Design Features

The execution of grinding and polishing works on the surfaces of concrete products is often accompanied by abundant dusts, which is very undesirable for electric tools. The settling dust adversely affects the operational life of any UWB. The Bulgarian "Interskol" Ushm-125 / 1100E is assembled in such a way that the dust formed during polishing / grinding does not penetrate inside the mechanism. This became possible due to the direction of the impeller armature, which sends airflow through the front of the reducer.

In these angle grinders, the pinion is secured by a keyed connection, they are pressed onto the spindle shaft. The whole mechanism of the grinder USM-125 / 1100E is assembled in one housing, in the rear part of which is a comfortable handle. Danae Bulgarians is a very convenient and powerful machine designed for professional use. Two-hand construction (main handle + optional) provides comfort and convenience during the operation of this power tool.

What is equipped with a Bulgarian?

"Interskol" USMM-125 / 1100E has an electronic system that allows, if necessary, to regulate the speed (from ten thousand per minute to three). The owner of this power tool can reduce them to the required level, without worrying about the fact that the power of the Bulgarian will also decrease. This quality, which has the grinding machine "Interskol" USMM-125 / 1100E, is especially appreciated by professional tilemakers. Lowering the speed of rotation, it is easy to handle glazed tiles and other delicate surfaces.

In addition to the electronic system, the angular grinder "Interskol" Ushm-125 / 1100E contains a special soft start board, which greatly facilitates the operation of the Bulgarian. The smooth start of the system is especially in demand when working with heavy cleaning discs and diamond nozzles for stone surfaces.

What is ensured reliable retention of the USM?

Comfort during operation is provided by special handles - holders. They are equipped with each angle grinder. "Interskol" USMM-125 / 1100E has one more pen, extra. Despite the fact that this device is compact in size, allowing it to be held with one hand, an additional handle is included and is indispensable for work related to cutting metal.

Technical indicators

• The power consumed by the power tool is 1100 watts.
• The voltage is 220 V / 50 Hz. Power comes from the electrical network.
• The speed of rotation is from 3000 to 10,000 per minute.
• Weight is 2.2 kg.
• The power tool is designed for a circle with a diameter of 125 mm.
• The main handle is three-position.
• Smooth start.
• There is a function of speed control.
• There is a fixed spindle.

When selling Interskol USM-125 / 1100E is completed:

• Additional handle;
• A set of gaskets;
• A special key for installing disks and attachments.

Advantages

One of the most reliable and durable products of Russian production is the Bulgarian "Interskol" USM-125 / 1100E. Customer feedback indicates good performance and high reliability of this electrical tool.

Among the users, the strengths of this Bulgarian are:

• It is possible to easily deploy the reducer by 90 degrees in case of inconvenient or unusual location of the trigger key;
• High power;
• Presence of a regulator of turns. According to consumers, the ability to reduce the speed of rotation makes this bulgarian irreplaceable for such jobs as cleaning of welds, removal of rust or old paint from metal structures using various grinding wheels and nozzles;
• The complete set with a long cord makes it much easier to carry and allows the Bulgarian to work at great distances from the outlet and in other rooms;
• Small dimensions and weight allow us to use Interskol USMM-125 / 1100E to work with small products, because for this purpose heavier Bulgarians are very uncomfortable;
• The presence of a quick-clamping protective cover, for the installation of which no tools are required;
• The presence of a power unit supporting a low speed;
• Acceptable cost of production;
• Presence of smooth descent;
• The presence of the main handle, which can be used in three positions;
• Optional accessories.

The combination of power, dimensions, weight and additional functions - positive qualities, which differs the angle grinder "Interskol" USMM-125 / 1100E. Customer feedback confirms the deserved popularity of the tool as among the masters who professionally apply this USM in production, and among amateurs who like to make at home.

Disadvantages of USM-125 / 1100E

According to numerous consumers, the weak sides of this Bulgarians are:

• The possibility of breakage of the speed controllers. Mostly this occurs as a result of voltage jumps from 220 to 260 V. In this mode of operation, the controller quickly breaks down.
• High cost of spare parts.
• Bad ventilation and lack of booking on windings. The lack of ventilation, according to users, leads to the fact that the engine located inside the engine burns after several weeks of work. This is due, in the opinion of the owners of the tool, to the fact that the plastic casing weakly protects the engine from dust.

The long operating life of the UWM-125 / 1100E is possible provided that the lubricant is properly lubricated and its carbon brushes and bearings are replaced in a timely manner.

Fixing

Any power tool sooner or later fails. Is not an exception and "Interskol" USM-125 / 1100E. You can repair this unit yourself.

All the failures of the Bulgarians are divided into mechanical and electrical.

Successful and quick troubleshooting will require:

• Instruction, which contains a detailed algorithm for disassembling and assembling the design of "Interskol" USMM-125 / 1100E;
• Scheme of the product;
• Car keys, hammer, vise, press. These tools are used to eliminate mechanical problems;
• Tester IR-2 for detection of short-circuiting turns (used for electrical breakdown of Bulgarians);
• Lubricant, flushing liquid, napkins (auxiliary materials).

Before you start, you should provide high-quality lighting workplace.

Guided by step-by-step instructions and a visual diagram, you can successfully repair the instrument yourself.

Stator breakage. Symptoms of a malfunction

The most common breakage of the stator is its ignition. It mainly occurs as a result of ignition of the power tool. Before you start repairing the bulgark, you need to inspect the structure and determine the nature of the malfunction. With the burnt stator, the rotor of the Bulgarian starts to uncontrollably unwind.

How to fix it?

To begin with, the angle grinder must be disassembled and the damaged stator removed from the housing. You can also check its functionality without removing it from the housing.

But such a procedure is possible only in a specialized workshop. At home, for such a check, you can use a special device to control short-circuited turns of the IR-2. It is designed to detect breakages or short circuits in the stator windings, which for this purpose need not be removed from the housing. A burnt stator needs a new rewind or replacement.

How to rewind the stator?

If there is no possibility to purchase a new stator, then it is possible to repair the old one by carrying out repair measures, consisting in covering the stator with a new winding.

Sequencing:

• From one edge you need to cut the old winding;
• Count the turns and determine in which direction the winding is made;
• Measure the diameter of the wire;
• Calculate the percentage of filling the core grooves;
• After removing the damaged winding, it is necessary to check the insulation and clean the grooves, wind the required number of turns;
• Put an insulating wire on the ends of the windings;
• Solder the ends of the windings.

When implementing a stator winding, it is important, using alternating current, to impregnate new windings. After impregnation, the impregnation marks must be cleaned, both inside the stator and outside, on its housing. During operation, it is necessary to check from time to time whether the rotor moves freely inside the stator.

Rotor breakage

There are several causes that cause malfunctions:

• Wear of carbon brushes;
• Voltage interruptions and short circuits;
• Wear of the armature manifold sipes;
• Destruction or jamming of rotor bearings.

To eliminate the rotor malfunction you need experience. It is best to purchase a new tool or fix an angle grinder in a specialized service center. If the work is done on its own, it is very important to have the necessary material and follow the procedure:

• The nut and key locking the leading conical gear of the rotor (11) is loosened;
• The pinion is removed from the rotor shaft (8);
• The rotor is removed from the reducer housing (19);
• With the help of a special puller or improvised means (vice, steel strips, hammer), bearings are extracted from it (9).

What other breakdowns are there?

One of the common breakdowns of electrical nature are:

1. Breakage of carbon brushes. This problem can also be dealt with on their own. Procedure:

• The design of the Bulgarian "Interskol" USMM-125 / 1100E is designed in such a way that the carbon brushes are located in special brush holders. You can get to them after removing the back cover in the stator housing;
• Unscrew the screws with which the brush holder is attached;
• Determine the level of wear of carbon brushes. It is possible to do this after measuring their remaining length. If the brush is in working order, then its length should be at least 0.5 cm.

2. Breakage of the power supply cable. This fault mainly occurs at the points where the wire enters the tool and into the plug. Twists in these cases will not solve the problem. A defective electrical cable should be replaced.

The final stage

After carrying out all necessary repair measures, the angle grinder is assembled back in the same sequence as it was being disassembled. But before the assembly itself, it is necessary to lubricate all the mechanical components of the Bulgarian.

For this purpose, experts recommend lubricants of domestic production. On the shelves of shops selling household appliances, you can find lubricants from foreign manufacturers, but they are much more expensive, although their quality is not better than domestic ones. Among a huge selection of lubricants, you should choose those products that have high adhesion rates (they are recommended for gearboxes of all grinding angle machines). Such lubricants are better linked to the surface.