In households and in industrial production, it is often necessary to carry out cutting and grinding of metal, stone or other products from solid materials. A power tool such as the Interskol grinder UShM-125 / 1100E is very effective for these purposes.
What is this tool?
The Interskol angle grinder UShM-125 / 1100E is an electronic device. In everyday life, it is often called a grinder and is used to work with iron, stone, concrete and other materials. Interskol UShM-125 / 1100E is an angle grinder using nozzles with a diameter of 125 mm and a power of 1100 W. It is a product of the Russian company Interskol. Work with the grinder is not limited only to cutting. This electrical device can also be ground and polished if necessary. Wide multifunctionality in application is possible due to design features and technical capabilities of angle grinders.
Bulgarian "Interskol" UShM-125 / 1100E. Design features
Performing grinding and polishing work on the surfaces of concrete products is often accompanied by abundant dust emissions, which is very undesirable for a power tool. Settling dust negatively affects the operational life of any angle grinder. The Bulgarian "Interskol" UShM-125 / 1100E is assembled in such a way that the dust generated during polishing / grinding does not penetrate the mechanism. This became possible due to the direction of the impeller of the anchor, which sends air flows through the front of the gearbox.
In these angle grinders, the gears are fastened with a key connection, they are pressed onto the spindle shaft. The whole mechanism of the grinder UShM-125 / 1100E is assembled in one case, in the back of which there is a convenient handle. This grinder is a very convenient and powerful machine designed for professional use. Two-handed design (main handle + additional in the kit) provides comfort and convenience during the operation of this power tool.
What is the grinder equipped with?
Interskol UShM-125 / 1100E has an electronic system that, if necessary, allows you to adjust the speed (from ten thousand per minute to three). The owner of this power tool can reduce them to the required level, without worrying that the power of the grinder will also decrease. This quality, which is possessed by the Interskol grinder UShM-125 / 1100E, is especially appreciated by professional tilers. By lowering the speed, you can easily process glazed tiles and other delicate surfaces.
In addition to the electronic system, the Interskol angle grinder UShM-125 / 1100E contains a special soft-start board, which greatly facilitates the operation of the grinder. The presence of a smooth start of the system is especially in demand when working with heavy cleaning discs and diamond nozzles for stone surfaces.
What provides reliable retention of angle grinders?
Comfort during operation is provided by special handles - holders. They complete each angle grinder. Interskol UShM-125 / 1100E has one more handle, an additional one. Despite the fact that this electrical device is compact in size, allowing it to be held with one hand, an additional handle is included in the kit and is indispensable for work related to cutting metal.
Technical indicators
- The power that a power tool consumes is 1,100 watts.
- Voltage - 220 V / 50 Hz. Power comes from the mains.
- The speed of rotation is from 3000 to 10 000 per minute.
- The mass 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 speed adjustment function.
- There is a fixed spindle.
Upon sale, Interskol UShM-125 / 1100E is equipped with:
- additional handle;
- a set of gaskets;
- a special key for installing discs and nozzles.
Advantages
One of the most reliable and durable Russian-made products is considered to be the Interskol Bulgarian UShM-125 / 1100E. Customer reviews indicate good work and high reliability of this electric tool.
Among users, the strengths of this grinder are:
- the ability to easily rotate the gearbox 90 degrees in case of an uncomfortable or unusual location of the release button;
- high power
- the presence of a speed controller. According to consumer reviews, the ability to reduce the rotational speed makes this grinder indispensable for such jobs as cleaning welds, removing rust or old paint from metal structures using various grinding wheels and nozzles;
- a complete set with a long cord greatly facilitates carrying and makes it possible to work with a grinder at large distances from the outlet and in other rooms;
- small dimensions and weight allow the use of Interskol UShM-125 / 1100E for working with small products, since heavier grinders are very inconvenient for this purpose;
- the presence of a quick-clamping protective casing, for the installation of which no tools are required;
- the presence of a power unit that supports low revs;
- reasonable cost of production;
- the presence of a smooth descent;
- the presence of the main handle, which can be used in three positions;
- complete with additional handle.
The combination of power, dimensions, weight and additional functions are positive qualities that distinguish the Interskol angle grinder UShM-125 / 1100E. User reviews confirm the well-deserved popularity of the tool both among masters professionally applying this angle grinder in production, and among amateurs, lovers of tinkering at home.
Disadvantages of UShM-125 / 1100E
According to numerous consumers, the weaknesses of this grinder are:
- Possibility of breakdown of speed controllers. Mostly this occurs as a result of power surges from 220 to 260 V. In this mode of operation, the regulator breaks quickly.
- The high cost of spare parts.
- Poor ventilation and lack of reservation on the windings. The lack of ventilation, according to user reviews, leads to the fact that the engine located inside the grinder burns out after several weeks of operation. This is due, according to the owners of the tool, to the fact that the plastic casing weakly protects the engine from dust.
The long service life of UShM-125 / 1100E is possible subject to high-quality lubrication and timely replacement of its carbon brushes and bearings.
Fix
Any power tool sooner or later fails. Interskol UShM-125 / 1100E is no exception. You can repair this unit yourself.
All breakdowns of grinders are divided into mechanical and electrical.
For successful and quick troubleshooting, you will need:
- the instruction, which contains a detailed algorithm for disassembling and assembling the Interskol design UShM-125 / 1100E;
- product outline;
- open-end wrenches, hammer, vise, press. These tools are used to troubleshoot mechanical problems;
- IR-2 tester for detecting short-circuited turns (used for electrical breakdowns of grinders);
- grease, flushing fluid, wipes (auxiliary materials).
Before starting work, it is necessary to ensure high-quality lighting of the workplace.
Guided by step-by-step instructions and a visual diagram, you can successfully repair the tool yourself.
Stator failure. Symptoms
The most common stator failure is considered to be its burning. Mostly it occurs as a result of burning a power tool. Before proceeding to repair the grinder, it is necessary to inspect the structure and determine the nature of the malfunction. With a burned stator, the rotor of the grinder begins to spin uncontrollably.
How to repair
First, the angle grinder needs to be disassembled and a faulty stator removed from the housing. You can also check its performance without removing it from the case.
But a similar procedure is possible only in a specialized workshop. At home, for such a check, you can use a special device for monitoring closed-circuit turns IK-2. It is intended to detect breaks or short circuits in the stator windings, which for this need not be removed from the housing. A burnt stator needs to be rewound or replaced.
How to rewind the stator?
If it is not possible to purchase a new stator, then the old one can be repaired 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 core groove filling;
- after removing the damaged winding, it is necessary to check the insulation and clean the grooves, wind the required number of turns;
- put on the ends of the windings an insulating wire;
- solder the ends of the windings.
When implementing the stator winding, it is important, using alternating current, to impregnate new windings. After impregnation, traces of impregnation are necessarily cleaned up, both inside the stator and outside, on its body. During operation, it is necessary to check from time to time whether the rotor moves freely inside the stator.
Rotor failure
The causes of the malfunction are several:
- carbon brush wear;
- power outages and short circuits;
- wear of lamellas of an anchor collector;
- destruction or jamming of rotor bearings.
To eliminate the rotor malfunction, experience is needed. It is best to purchase a new tool or repair 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 are unscrewed, fixing the leading bevel gear of the rotor (11);
- the gear is removed from the rotor shaft (8);
- the rotor is removed from the gear housing (19);
- with the help of a special puller or improvised means (vice, steel strips, hammer), bearings (9) are removed from it.
What kind of breakdowns are there?
One of the common electrical failures are:
1. Damage to carbon brushes. You can also deal with this problem on your own. Procedure:
- the design of the Interskol grinder UShM-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 that secure the brush holder;
- determine the level of wear of carbon brushes. This can be done after measuring their remaining length. If the brush is in working condition, then its length should be at least 0.5 cm.
2. Damage to the power cable. This malfunction mainly occurs at the places where the wire enters the tool and into the plug. Twists in these cases will not solve the problem. Faulty power cable should be replaced.
Final stage
After carrying out all necessary repair measures, the angle grinder is assembled back in the same sequence as it was disassembled. But before assembly, it is necessary to lubricate all the mechanical components of the grinder.
For this purpose, experts recommend domestic lubricants. On the shelves of stores selling household electrical appliances, you can find lubricants from foreign manufacturers, but they are much more expensive, although their quality is not better than domestic ones. Among the huge selection of lubricants, one should choose the product for which high adhesion is indicated (they are recommended for gearboxes of all grinding angle grinders). Such lubricants adhere better to the surface.