Corner grinder noisy and sparkles the air. Forbidden dishes

Why does a corner grinder (corner grinder) do not work: heated, sparkles, vibrates, noisy and does not gain momentum

Corner grinder (angular grinding machines), in the common people called Bulgarians, are considered an extremely reliable and popular tool. However, any thing breaks or later and is required to repair. It is not so difficult to repair a corner grinder on your own if you have an instruction on your hands where the procedure is indicated. Below you can find answers to questions related to the repair of the stator, rotor, gearbox and coal brushes angular grinder.

Corner grinder are extremely common among many domestic craftsmen. The ability to replace working elements allows you to carry out polishing, grinding and detachment manipulations. And the presence of a smooth starting device significantly increases the convenience and safety of work. The repair of a corner grinding grinder is a simple job that you can cope with on your own. Those who decide to do this will need an angular grinder of the required type, grease materials, the tool itself and a step.by.step guide.

Any repair of the corner grinder should begin with the detection of faults. Corner grinder is characterized by a simple device. When rotating the rotor, by means of a scooter of the gear, the torque is transmitted to the spindle (shaft) of the working element. There is a polish or grinding wheel or stone on the shaft.

It should be noted the shape of the clove. On the corner grinder of small power, as a rule, gears with straight cloves are installed. Sobbling designs are used in devices, the power of which starts at 1000 watts.

Corner grinder, like any tool, is subjected to all kinds of breakdowns over time, the causes of which can be very different. They can arise not only from improper use of the device, but also due to the untimely/incorrect change of coal brothers and materials for lubrication.

Regardless of the model and brand of the corner grinder, the problems of the problem in all have almost the same. They can be conditionally divided into electrical and mechanical. For renovators, novice, who do not know how to disassemble the corner grinder, breakdowns can be divided into complex and simple.

Device and electrical circuit of corner grinders

Over the long years of the existence of such an instrument as an angular grinder, its appearance, as well as the internal device have practically not changed. To repair the corner grinder with your own hands, you need to know the device of its mechanical part, as well as an electrical.

If you look at the picture below, you can see what parts the angular grinder consists of.

• A wheel to adjust the spindle of the unit.
• An electric engine consisting of a rotor and stator.
• Start button. Sometimes a smooth start system is connected to it.
• Shock.resistant plastic.
• Spindle fixation button (used to change the tool).
• Surprising coupling. Protects the engine from overload, when jaming the tool.
• Protective casing. Closes the tool and protects the user from flying particles of the processed material, and also prevents human injury when the tool is destroyed, for example, an abrasive disk.
• Clamping. Unscrewed using a special key that comes with the power tool. There are also quick.sound nuts that can be unscrewed without a key.
• Gearbox and gearbox itself. Consists of the gears block that transmit rotational movements from the rotor to the spindle with a tool.

The figure below shows the electrical circuit of the angular grinder.

The electric part of the corner grinder has the following elements:

• electric cable with a fork for connecting to the mains;
• start button;
• stator;
• electric brushes (coal or graphite);
• collector;
• Anchor (rotor).

The following figure shows the connection diagram of the corner grinder, namely its engine.

All components of the electric motor perform certain functions.

• The rotor is a shaft on which coils and a collector are placed. The rotor, rotating in the stator magnetic field, transfers rotational movement to the angular grinder gearbox.
• Collector. It is a part of the rotor to which all control cables are summed up. Electric signals from the control unit to the engine pass through the collector. It is to the collector that the electrics are connected.
• Electric power plants. Their main task is the transmission of electric current from the power cable to the collector.
• Stator. Is a coil with a certain number of turns. The task of the stator is to create a magnetic field, which, interacting with the anchor, sets the latter in motion.

Device and electrical circuit of corner grinders

Over the long years of the existence of such an instrument as an angular grinder, its appearance, as well as the internal device have practically not changed. To repair the corner grinder with your own hands, you need to know the device of its mechanical part, as well as an electrical.

If you look at the picture below, you can see what parts the angular grinder consists of.

• A wheel to adjust the spindle of the unit.
• An electric engine consisting of a rotor and stator.
• Start button. Sometimes a smooth start system is connected to it.
• Shock.resistant plastic.
• Spindle fixation button (used to change the tool).
• Surprising coupling. Protects the engine from overload, when jaming the tool.
• Protective casing. Closes the tool and protects the user from flying particles of the processed material, and also prevents human injury when the tool is destroyed, for example, an abrasive disk.
• Clamping. Unscrewed using a special key that comes with the power tool. There are also quick.sound nuts that can be unscrewed without a key.
• Gearbox and gearbox itself. Consists of the gears block that transmit rotational movements from the rotor to the spindle with a tool.

The figure below shows the electrical circuit of the angular grinder.

The electric part of the corner grinder has the following elements:

• electric cable with a fork for connecting to the mains;
• start button;
• stator;
• electric brushes (coal or graphite);
• collector;
• Anchor (rotor).

The following figure shows the connection diagram of the corner grinder, namely its engine.

All components of the electric motor perform certain functions.

• The rotor is a shaft on which coils and a collector are placed. The rotor, rotating in the stator magnetic field, transfers rotational movement to the angular grinder gearbox.
• Collector. It is a part of the rotor to which all control cables are summed up. Electric signals from the control unit to the engine pass through the collector. It is to the collector that the electrics are connected.
• Electric power plants. Their main task is the transmission of electric current from the power cable to the collector.
• Stator. Is a coil with a certain number of turns. The task of the stator is to create a magnetic field, which, interacting with the anchor, sets the latter in motion.

The main malfunctions of the corner grinder and their causes

According to statistics, most cases of failure of the corner grinder are associated with the electric part of the device. Some breakdowns can be insignificant, which allows you to repair corner grinding grounds with your own hands. But, for example, when the engine windings are blocked, the repair of an angular grinding machine can only be carried out by a specialist.

Corner grinder does not turn on

The reasons that the corner grinder does not turn on can be as follows:

• an electric fork is faulty;
• faulty electric cable;
• The launch button broke;
• the contact between the power cable and the button is disturbed;
• cliff of the contact wire of the electric shock;
• severe wear of electric grinding;
• The failure of the rotor or stator windings.

Corner grinder does not develop momentum

The reasons that the corner grinder is not gaining momentum can be different.

• Damage of the revolutionary control unit. To check this version, you need to connect the machine engine directly, bypassing the regulator and check the operation of the device.
• Electric cable malfunction due to constant overcurrents or mechanical damage. Because of this, the damaged wire begins to warm up under load, and the engine speed is falling.
• Dust pollution by dust. It is necessary to remove pollution with alcohol.
• Problems with brushes. They can be worn out or have a short contact wire, as shown in the next photo.

The brush, although half.wiped, is quite efficient. In this case, a short contact wire prevents the spring with press the electrode to the collector. This situation can also be the reason why the corner grinder stopped working in normal mode.

The electric motor heats up

The reasons that the angular grinder is heated may be the following.

• Incorrect operating mode of the device. As a result of overloads, the electric motor can be very hot, which often leads to blocking the windings.
• Destruction of bearings located on anchor. As a result, the rotor clings to the stator, the engine operation is difficult, and the windings overheat. The problem is solved by the replacement of bearings.
• Clogging of the ventilation ducts through which the air enters the engine cooling. It is necessary to clean the ventilation holes from dust.
• Damage to the impeller, which serves to cool the engine. It is installed on the rotor, on the opposite to the collector side. If the impeller is broken, it must be replaced with a new.

The corner grinder sparkles

If you notice a strong sparking when turning on an angle grinding machine in the place where the collector is located, then the reasons for this trouble may be the following.

• Damage to the anchor winding: a break in one or more sections of the winding, an interval circuit. With such breakdowns, increased noise appears, engine speeds fall and brushes burn.
• The contact between collector plates and winding was violated.
• Weakly clamping brushes. With prolonged modes of corner grinding, the springs overheat and can “eat up”, while losing the elasticity.
• Balance of the engine rotor.
• Violation of the cylindrical surface of the collector. This sometimes happens after rewinding, if the anchor is not pulled on a lathe, but immediately installed in the device. In this case, you can also observe that the brushes sparkle excessively.
• Between the collector’s lamels, insulation is impaired. There may also be clogging of the grooves of the proxy with graphite or breakdown between the lamellas.
• Bearing wear that causes the rotor bearing also leads to the fact that brushes sincle greatly.
• Violation of the geometry of the rampage shaft. This usually happens with an inaccurate disassembly of the electric motor when the shaft bends.
• The graphite brushes are installed in the wrong brand. Brushes are selected based on the expected revolutions and stress.
• Raising one or more lamellas leads to the fact that brushes are quickly burned. This happens due to overheating of the engine during prolonged operation. As a result of the glass mass, which serves as the basis of the collector, softens, and the lamella begins to rise. Due to the fact that the lamellas are raised, the brushes are erased very quickly.

The main malfunctions, the reasons for their appearance and repair methods

To simplify the task, searching for a malfunction and repair must be carried out systematic. No need to rush to disassemble the tool. First, decide on the type of malfunction. The most important nuisance is that corner grinder does not turn on. What needs to be checked:

The anchor of the electric motor

If these elements are working, then examine the contact brushes. The brushes serve to transfer the supply voltage to the contacts of the electric motor collector. The windings of the anchor are soldered to these contacts. If one of the brushes does not contrast or at all a broken, then the electric current will not enter the winding and the corner grinder will not want to work.

In order to inspect the condition of the brushes, you need:

The brushes are loaded, so you have to try not to lose the springs. The extracted brushes should be the same size. They will have some wear, but there should not be chips and transverse cracks that could violate the contact.

If the brushes are in normal condition, then you will have to inspect the engine anchor. This node is only called an anchor, but in fact with an anchor has absolutely nothing in common. This is the central shaft of the engine on which the winding and the collector crown are located. Sometimes, due to the large loads between the brushes and contacts of the collector, a strong spark arises. As a result, copper contacts are covered with a layer of oxides and the current does not go to the winding.

What needs to be done to put the anchor in order? You need to take ordinary white gum, which is used by drawers and lovers to draw. The corner of the elastic band needs to rub the contacts. A film made of oxides should be cleaned and shone with a copper luster.

If this operation did not give results, then it is necessary to open the body of the corner grinder and inspect the condition of the internal wires, the phase.drive capacitor and the winding. The winding should have an even color of the varnish, which is covered with a winding wire. Darkening or blackening of the wire or its sections indicates a short circuit of the winding. It is difficult to eliminate this malfunction with your own hands, you will need to replace the anchor.

REDUTOR Repair

The task of the gearbox is to convey the rotation of the electric motor shaft to the disk of the corner grinder. over, since we have an angular grinding machine, then the gearbox is a corner. To inspect it, you need to:

After that, the gearbox should leave the body. There are few malfunctions here:

Output elements of the gearbox must be replaced. The replacement of the gear is difficult to imagine anything. Then the gearbox is lubricated with a good layer of thick lubrication and installed in place.

Repair of the stator corner grinder

The stator is called that part of the electric motor, which is motionless in the case. It is designed to create an electromagnetic field in which the anchor rotates.

The main malfunction of the stator is a break in the winding or its strong overheating. What is the danger of overheating? When overheating of the winding wires, protective insulating varnish, which covers them, also overheating. Violation of lacquer isolation leads to a short circuit of the turns of the winding.

Even the closure of one turn of the winding completely removes the corner grinder out of order. The winding immediately begins to overheat and smoke. The shaft rotates slowly or even ceases to rotate.

To repair the stator will have to change windings to new ones or rewind. But the rewinding of the stator is not for beginners.

What can a grinder do?

Initially, this power tool was carried out only as a grinding machine, but over time it was improved, which allowed it to be used for various types of work.

• Process various types of building foundations (brick, concrete, etc. D.);
• Polish the surface;
• Cutting material, including stone and metal;
• Clean the other surface;

With the right choice of additional devices, all these tasks can only be completed using this power tool.

What is the difference between professional grinding machine and household?

Grinding machines used in large.scale construction work have significant differences from household models. Therefore, their cost will be different.

The main features of a professional angular grinding machine are:

• High wear resistance of nodes, which allows you to use it for long.term work;
• Energy characteristics (more than 1,500 watts);
• With a significant weight, the cause of which are special nodes and a high.strength case;
• With a low probability of overheating;
• In additional functions that can facilitate long.term work on it;
• In the price of the machine and its components;

The manufacturer indicates the characteristics of the chopper in the description to it, as well as in the instructions for use.

Characteristics and action of brushes for angular grinders

Corner grinder is one of the most popular power tools. Many people believe that the drill is in the first place, and the corner grinder in the second. It has such popularity due to its multifunctionality, because with its help you can perform a variety of types of work.

This is a cutting of metal, and stripping and grinding, and you can cut not only metal, but also tiles, wood, porcelain stoneware and much more depending on the nozzles and fantasy of the tool adapting masters.

The new corner grinder works great and copes with most of the tasks, but the moment comes when the car fails. the brushes wear out or “burn”.

Action and characteristics

These elements are needed for normal operation of not only corner grinders, but also many other power tools. Graphite brushes for corner grinders are needed to relieve voltage from the stator, while skipping electricity and acting a mobile mechanism. Their wear and tear is due to friction about the anchor collector, which rotates during operation.

Timely replacement of brushes is very important, since, otherwise, a breakdown of the power tool may occur.

With the normal condition of the brushes, rotating details move without difficulties and special efforts. In order not to miss the moment of wear of the brushes, you need to periodically check their performance.

If the graphite rod is erased and the edge is close to the limiters of wear, it is necessary to replace.

Thanks to these details, the wear of the tool is also reduced, since these elements are very easy to change. The main parameter is that the brushes should withstand the mechanical load, which is ensured by rotation of the rotor.

Materials for manufacturing

Different materials are used for the manufacture of brushes, but coal or graphite is most often used. Coal-graphite, copper-angle, core are less common.

Graphite brushes for angular grinders are perfect, as they have a high coefficient of current.conductivity and, as a rule, have a good switchpipable property. Some types of such spare parts can automatically depart from the rotor in case of overload and not damage, which is achieved thanks to the ceramic tip of the spring, which is built into the body of the spring of the part.

The ceramic tip does not conduct current and is released when the brushes are worn out, as a result of which the spring pushes the connector. Coal brushes for corner grinders are more durable.

Even in tools with reverse such as a drill and an electric screwdriver, they serve for a long time and retain the power in reverse mode. Particular attention should be paid to details with additional contact.

The manufacturer of such a tool is guaranteed uninterrupted operation only when replacing brushes with original.

Causes of quick wear

Very often, those who use corner grinding, ask the question: why brushes on a corner grinder are burning. However, the corner grinder itself has nothing to do with it, because such a phenomenon can happen to any collector.type engine.

The collection engine speed is not limited to current frequency, and due to increased speeds, the collector must withstand the load, while sparking under the brushes should decrease without engine heating.

When malfunctions appear in the power tool, sprinkling brushes appears.

Many reasons may be associated with this phenomenon. Such are:

• A malfunction of the anchor winding. Short circuits of turns, breakthrough sections of the winding. In this case, the motor can make noise or lose speed.
• Poor contact or a complete break in the winding on collector plates.
• Wear of clamping springs, as a result of which the electric shows are not pressed against the collector. Most often comes from prolonged work and overheating.
• Violation of the centering of the anchor.
• Bearing wear and beating of the rotor.
• Violation of the geometry of the anchor with a “strict” disassembly of the motor.
• Violation of the pole of brushes relative to the collector.
• The installed brushes are not suitable for this electric motor.

Also, the reason for the sparkling of the brushes in the corner grinder may be the rise of one or more collector plates as a result of overheating. In this case, brushes can sparkle very hard and quickly wash. Of course, sparking when rotating the anchor is permissible, but if this phenomenon is very high and the smell of Gary is smell from the ventilation opening, then the graphite or coal part must be replaced immediately.

Ways to replace brushes

If the winding of the stator and the rotor has not yet burned down, then you need to deal with the technical replacement options, and there are several of these:

• The model of corner grinder is equipped with small plastic lids with threads or fixed screws. Such lids are simply unscrewed, and the spare part changes.
• There is a brush holder in the corner grinder, which is hidden under the body. To replace the consumer, it is necessary to disassemble the body, unscrewing a few screws. Such a tool usually consists of two parts, in one of which when disassembling you can detect the inclusion button and brush holders. Constructively brush holders may differ. In a folding holder, you will have to disconnect the electrical and then insert a new part, and in the usual this action is not always necessary. depending on the structure.

After disassembling the grinder, it is advisable to clean from dust and the presence of extraneous garbage. It is also necessary to inspect the collector for scratches and damage, since worn spare parts could affect the integrity of its surface.

Types of faults

On these replaced and relatively inexpensive details there may also be malfunctions:

In this case, there will be increased sparking. To eliminate them, rubbed with glass paper. In the process of grinding, you must first use coarse.grained material, and then fine.grained. The use of the sandpaper is undesirable, since sandpaper when it hits the collector, can close the collector plates.

Options for solving problems

In most cases, the reason why brushes are burning may be a short circuit in a stature or rotor.

Why sincle the brushes of the drill

The advantages of collector electric motors. high speeds, small dimensions and mass compared to asynchronous (and even more synchronous) engines of the same power. determined their widest use in manual tools and non.stationary household appliances. But there is a drawback.

This is a brush mechanism, which is not just subject to accelerated wear, requires regular maintenance and replacement of elements, creates additional noise and interference, but can also (if neglected by this service) cause an irreversible breakdown of equipment and even fire.

Is it possible to solve these problems without resorting to troublesome and expensive visits to service centers?

Safety precautions of sparking and eliminating a malfunction

Safety precautions

I would like to believe that a person simply will not do the repair described in this article, who does not imagine what electricity is and how to not suffer from it.

But since the vacuum cleaner is not a floor lamp or electric brood, but one of the most “evil” household appliances (at least because of power), we recall 3 of the most important points (the first is fair for any equipment, and the second and third are purely vacuum cleaning):

• All operations (except tests, of course) are carried out only with a disconnected plug fork. No hopes for the switch (in the device itself, in the filter-executor or somewhere else): he, firstly, does not create a visible gap, and secondly, it does not always break the phase and, finally, may turn on by accident. The fork (not “above”, but lying at a noticeable distance from the outlet!) it will not turn on in any way.
• The rotors of engines of such power as in vacuum cleaners (usually from 0.5 to 2 kW), and even in total with the compressor impeller have a considerable moment of inertia. And the start is very fast. The result is a strong jerk of the stator in the direction opposite to rotation, at the time of inclusion. And the more tangible, the more other details the motor is released. And the conductors are usually short, at the same time they can break off, closed, whip the arm Therefore, there are no fingers for this place for this, from which, with a sharp turn, it is easy to slip into the elements that are under voltage or in motion. Before testing, the stator (the remainder of the case) must be reliably fixed. if not in a vice, then at least they are pressed to the floor through a hard insulator that will not touch, bent, mobile parts. In general, such tests (like all work without relief near the current.carrying parts), even qualified electricians must produce together.
• Collector engine speeds are not limited by the voltage frequency or some kind of design features. The dynamic equilibrium between the generated power and the load should just occur. If the latter is not at all, literally in a fraction of the second the motor is in the most literal sense: it can not only burn its bearings and brush mechanism, but also fly apart like an abrasive disk, with no less dangerous people and objects. Therefore, if the disassembly has advanced so that even the compressor impeller is dismantled (the friction of which is about the air and is the only load in the vacuum cleaner), the engine cannot be turned on for a second! And even with the impeller, but completely free air duct through it (neither hose nor filters) will be significantly higher than nominal, and current consumed. below. Exploring the sparking of brushes in this mode is pointless. It is necessary to provide at least a slight resistance to the air-to cover the compressor in the compressor in a flat item with a flat item or 100% not very dense carpet, a small mesh But everything should be hard or reliably fixed in a stretched state so that the compressor cannot suck anything: Even a soft extraneous object in it is an instant death for a thin aluminum impeller.

Causes of sparking

The rotor (anchor) of the collector engine contains several (from 3 to 36) windings, the conclusions of which are riveted and (not always) are soldered with a refractory solder in special openings of copper contact plates. lamellas. lamellas.

The latter are installed with intervals of 0.5–1 mm on the cylindrical surface of the heat.resistant dielectric and form the collector itself.

Current through diametrically located, pressed with springs and brushes sliding along the lamella is always supplied to that winding, the magnetic field of which is perpendicular to the stator at the moment, and provides the greatest rotating force due to this.

Not at all sparking sliding contact cannot in principle. Especially with high power and inductive load. However, sparking should not exceed certain limits, which, of course, can help photographs, but it is best to experience when a person has seen the work of a mass of such devices or the operation of this product in a fully working state.

There are quite a lot of reasons for increased sparking:

• Wear of the brushes themselves.
• Their insufficient dullness (in new ones).
• Their distortion due to wear, cracking or displacement of the brush holders.
• Weakening of springs.
• Interpreter closing in windings.
• Anchor beat due to the wear of the bearings.
• Oxidation and/or pollution of lamellas.
• Their production.
• Clogging of gaps conducting dust.
• Defects of individual lamellas (caverns and burners, staggering in dielectric, “licking” the upper layer towards the next period and so on).

Accordingly, to eliminate it, you must first establish which of the reasons we have.

Search and elimination of malfunctions

Since at first. a visual inspection, recall: who missed the chapter about safety precautions, return! There are most of the testing instructions!

As in all searches among a large number of options, it is best to start with the cut off of clearly inappropriate. For example, if one of the brushes sparkles much more than the other, then the problem is in it: defects of lamella, windings and bearings would affect both of them the same way. That is, it remains to check only the first 4 points.

Frequent malfunctions, reasons

The corner grinder may not gain speed laid down by the regime, work with their spontaneous change, with jerks and in extreme cases to stop rotating altogether. If there is an option to adjust the revolutions, it may not respond to a change in the position of the indicator of the operating modes.

Some types of malfunctions and ways to eliminate them are considered in the presented videos.

He is not gaining momentum

Corner grinder of Makita models, working from batteries, did not gain the size of working speeds in the next video. The first reason that comes to mind is the batteries of the battery, not confirmed. When disassembling the tool, faulty brush holders were discovered. The hit of an extraneous oily liquid inside the brush-collection node caused the destruction of the brushes and the melting of the plastic structure of the brush holders.

Types of breakdowns in Bulgarians

Typical minor breakdowns

In the event of a malfunction that arose, it is first necessary to exclude elementary breakdowns:

• Corner grinder does not turn on. The corner grinder suddenly became faulty. stopped turning on. In this case, you need to check the serviceability of the outlet, then the fork and the network cord, perhaps, the drive simply does not work due to the fact that the current does not get into the product.
• The cable with a fork is whole, and the drive does not work. You need to check the start button. The repair of the switch of the corner grinder is easier to buy a new button and its replacement. Since it is rarely subject to repair. mainly a plastic thrust of the switch breaks inside. If you want experiments, you can disassemble it by numbering contacts, and back all in place so that there is no closure after assembly.
• The above details of non.counterates, and the angle grinding machine does not want to work. it means that the time has come to check the brushes. Perhaps it’s time to change them in a corner grinder. The brushes from work are constantly warming up, so they quickly wear out and more often than other details need to be replaced, moreover.

Significant malfunctions

Having excluded all minor breakdowns, it is necessary to figure out why the tool does not want to turn on, and how to repair it. Most likely, the malfunctions are serious, requiring additional knowledge. This happens in cases if:

• deformed body;
• He jammed one of the bearings;
• an anchor or stator does not work;
• The teeth of the gear of the gearbox were broken or erased;
• The collector failed;
• The sensor of control electronics does not show signs of life.

If it is determined that the malfunction occurred in the mechanical part of the corner grinder, then you need to pay attention to the condition of the large gear located on the shaft and to the bushings. If the teeth partially erased or the shaft shafts occur, they need to be replaced immediately.

The most common breakdowns

Malfunctions of the corner grinder happen quite often. Everyone who works with this tool knows about it. What is out of order most often?

The spindle fixation button broke.

Only one awkward press on the spindle fixation button, when the disk is rotated, leads to its breakdown. Sometimes it can be broken if it is used to remove the jammed disk. To prevent this from happening, you need to use an rye key inserted into special holes near the location of the disk.

Drain the teeth of the gear

It mainly arises when jamming occurs. If a roar is heard in the gearbox, this is a sign of just such a malfunction. Когда у шестёренки сломано больше одного зубчика, то угловая шлифмашинка не сможет резать необходимый материал.

In order for the tool to continue work, it is necessary to change the gears, and everything, and even the conical wheel. Before going to the store for spare parts, remember the manufacturer’s company, model and power of the product.

The electric motor does not work.

This type of breakdown happens with an angular grinder that work in places where there is a lot of dust, and when they are given rest, they are left on the ground. The dust that gets inside spoils the winding. Large loads, especially for the low power of the corner grinder, turn out to break off the motor.

If the corner grinder is used to cut materials that create a lot of dust, then it is recommended to cover the places of ventilation holes with something.

The bearing sprinkled

The weakest link, and not only the Bulgarians, are bearings. A large speed of rotation quickly wear out the mechanism. One thing pleases that changing the bearing is easy. Replacing a sprinkled bearing at the corner grinder should be done on time so that there is no breakdown that can no longer be fixed.

Stator malfunction

This breakdown is easy to determine when the angular grinder turned on, but the disk turns are too intense and differ from normal work. which means that in the stature there is a turning point on the winding. The breakdown of the stator is considered the most serious, special skills are needed to eliminate it. When there are doubts in your abilities, it is better to turn to professionals, so that later you do not have to buy a new tool.

If the decision to fix it independently, it begins with cutting the frontal parts of the winding, the remains are all removed. The next step is a new winding on the template. It should be identical in the number of turns, with the same density and from the wire of the same thickness as the previous one.

Gearbox

Corner grinder, whose power is less than 1100 watts are usually equipped with straight.toothed gears. They are on the stature. Bulgarians with greater power have a scooter gear. Each of the options has a cone.shaped shape, the rod of the gearbox of the corner grinder crosses with the shaft of the stator at an angle.

Repair of the gearbox of the corner grinder mainly consists in replacing the gears. In the case of a breakup of a disc toothed wheel, it is difficult to replace it, because it is very firmly fixed. It is easy to disassemble the gearbox:

• It is necessary to unscrew the nut on his part;
• Gently take the rotor housing in the vice and knock out the gearbox body with light blows;
• change the position of a clamped rotor and knock out a bearing through a wooden board;
• unscrew the gear from the shaft.

Revolution regulator

The speed regulator is not present in all Bulgarian models. When the corner grinder is used for cutting, it, in principle, is not needed, but if you grind it, it is simply necessary. If suddenly he stopped working, then most likely, a fee that needs to be removed and buy the same in the store of power tools for further replacement.

Self.repair of corner grinding grounds is not always carried out. If suddenly something does not come out or not everything is clear, it is better to contact the service center.

Homeples turned a monkey into a man

Here is such a corner grinder from Makita, under the discs of 125mm, has been working for about 4 years in the metalworking workshop, never cleaned inside, once the brushes for homemade changed and now she began to brew it strangely during work!

One time after work it lies on a shelf, and from it a strong white and smelly smoke fell from it, they urgently turned off the outlet, but the smoke of such a strong concentration that it was still going on for a long time.

For this reason, you can never leave an electrical tool included in the outlet, leaving home!

Immediately disassembled and revealed the reason.

It turned out to be a switch, which over time throws with a metal chip, which exacerbates two contacts for connecting the power wire 220 volts. After that, the chips begins to burn, burning the plastic, which is charred itself becomes a current conductor and burn yourself even after mechanical chips cleaning. Therefore, cleaning did not help for a long time and smoke went again.

I had to look through the Internet and calculate the switch model, t.to. what model of corner grinding is already unknown.

It turned out to be a switch 9553NB/9554NB/9557NB Makita 200r. At the same time, I decided on the brushes, the homemade ones have already burned down, the brushes are SV-325 (original) 130r, you can also put the SV-327, SV-303 (only you have to solder the tips yourself).

I replaced the switch and now I will periodically disassemble the corner grinder and blow out the air stream so that metal dust does not accumulate, chips.

Dowry: recently, a similar one occurred with a completely new corner grinder from Metabo, which after a couple of days of work in the workshop, failed for this reason, so I do not recommend this tool for working with metal in a dusty room.

Recently, the corner grinder has become a familiar tool for a simple layman. Thanks to this power tool, you can perform different work of the carpentry and locksmith, and its simplicity and multifunctionality determines greater popularity in everyday life.

During the long.term operation of the equipment, the parts wear out, and in some cases they become unusable. Therefore, you often have to not only change the brushes, but also make the repair of the anchor of the corner grinding of with your own hands. Repair of corner grinder must be carried out carefully and carefully to prevent negative consequences and the appearance of more complex breakdowns.

Electrical equipment device corner grind

Over several decades, the external parameters of the corner grinder have almost not changed, with the exception of improved models that use the battery as an element of power. The basis of the tool is a case with an integrated asynchronous engine and a gearbox, and a handle with a protective case is also screwed.

The power tool can be used with cutting and food disks, and there are also disks with sandpaper petals for grinding. Like all tools, a grinder may refuse to work, but most often it is not so difficult to eliminate the malfunction. To do this, you may need disassembly of the case and minor repair of parts. However, it is necessary to understand the device of a corner grinder, in the diagram of which there are the following elements:

The performance of all elements is very important for the normal functioning of the entire system. When failing of any part, a grinder becomes a useless tool. In order for the disk of corner grinder rotate, the anchor must rotate and set in motion, and the faster the anchor rotates, the greater the speed of the disk rotation. The collector is a peculiar part in the form of a platform to which the contacts of power and control electric departments lead. The collector takes the voltage from the brushes, and in the future process, the electrical energy turns into a mechanical.

How a corner grinder arranges

Do.it.yourself corner grinder repair begins with the fact that the cause of the malfunction should be found. To do this, it is necessary to find out the principle of operation and the design of the tool. The principle of the functioning of the device is based on the conversion of electrical energy into a mechanical. Mechanical energy is rotational movements, which drive the working shaft of the tool with appropriate nozzles.

This means that the corner grinder consists of two parts: electrical and mechanical. Damage can happen in any node, so it is important to know the structural elements of both parts. The main elements of the corner grinder include:

• Plastic case.
• The electric motor is two.phase.
• Gearbox.
• Power button.
• Sliding bearings.
• Brush node.
• Network cord.
• Revolution regulator (for some models).

The case is made of shockproof plastic. The construction of the case combines an electric circuit with mechanics. Engine rotor rotates by supplying electric current. Sliding bearings provide rotating movement of the rotor shaft. At the end, the shaft has a toroidal gear. It sets in motion a flat gear, which is located in relation to the shaft at an angle of 90 degrees. Thus, an angular grinder is carried out. In addition to the two sliding bearings on which the rotor shaft rotates, there is another bearing knot in the corner grinder. It is located on the working shaft of the mechanical part of the tool.

Typical malfunctions of the Bulgarians and methods of diagnosis and repair

Do.it.yourself corner grinder repair begins with determining the cause of the breakdown. If the reason is not possible to determine, then you should follow the method of excluding breakdowns from simple to complex. For self.repair, it is necessary to identify initially, where the breakdown is located. in the electrical or mechanical part.

Reducer malfunction. The scobillar gear is attached to the rotor shaft, so if the motor works, but there are no rotational movements of the working part, then the reason lies in the gear mechanism. In order to see what happened to the gears, it is enough to disassemble the tool case. The cause of the gearal malfunction is most often licking the teeth of a large gear of the shank. The reasons for this are the most diverse:
lack of lubricants;

One way or another, after detecting a malfunction, it should be immediately eliminated. This can be done by replacing a faulty gear. Most often, on sale you can find them in tandem with a braid, which is installed on the shaft. It is recommended to replace two gears in a pair, after which they must be carefully lubricated with special lubricants.

These are the main types of malfunctions of the mechanical part of the tool, in the elimination of which there are no problems. Now we will pay attention to a more complex part. this is an electric. In the electric part, such types of breakdowns may occur:

• Damage to the network cable. In case of damage to the network cable, the voltage supply to the power tool stops, so the corner grinder will not function. The cable can be damaged for various reasons (transmitting, pushing, transit), but it will not be difficult to determine the breakdown. You need to use the tester that is performed. In this case, you will need to disassemble the tool.
• The failure of the control button. Corner grinder in the design can have a regular button for launching the tool, or they can. with a smooth start. In a regular button, most often, contacts are oxidized or clogged, which is enough to clean with sandpaper. In the buttons with speed regulation, the reason is often hidden in damage to the contact plates. The device can be disassembled, then check the integrity. If a damaged contact plate is detected, you will need to replace the launch unit.
• The problem with the brush mechanism. Brushes are consumables that have a fairly large resource. If your instrument is already for many years, then you should make it out and look at the brushes. If they are erased, then they need to be replaced, that it will not be difficult to do at all. If the brushes still have a sufficient length, then the reason may be in the collector mechanism, which has obvious signs of oxidation or pollution. It should be cleaned, then check the tools of the tool.
• Rotor and stator malfunction. During the operation of the tool with heavy loads, the winding of the stator or rotor may burn out. You can determine the malfunction using a multimeter in resistance mode. The best option is to give the engine assembly to the repair shop, where the cause of the breakdown will be identified, and also fixed. Usually the burned winding is rewound, but it all depends on the scale of the malfunction.

Types of breakdowns in Bulgarians

Typical minor breakdowns

In the event of a malfunction that arose, it is first necessary to exclude elementary breakdowns:

• Corner grinder does not turn on. The corner grinder suddenly became faulty. stopped turning on. In this case, you need to check the serviceability of the outlet, then the fork and the network cord, perhaps, the drive simply does not work due to the fact that the current does not get into the product.
• The cable with a fork is whole, and the drive does not work. You need to check the start button. The repair of the switch of the corner grinder is easier to buy a new button and its replacement. Since it is rarely subject to repair. mainly a plastic thrust of the switch breaks inside. If you want experiments, you can disassemble it by numbering contacts, and back all in place so that there is no closure after assembly.
• The above details of non.counterates, and the angle grinding machine does not want to work. it means that the time has come to check the brushes. Perhaps it’s time to change them in a corner grinder. The brushes from work are constantly warming up, so they quickly wear out and more often than other details need to be replaced, moreover.

Significant malfunctions

Having excluded all minor breakdowns, it is necessary to figure out why the tool does not want to turn on, and how to repair it. Most likely, the malfunctions are serious, requiring additional knowledge. This happens in cases if:

• deformed body;
• He jammed one of the bearings;
• an anchor or stator does not work;
• The teeth of the gear of the gearbox were broken or erased;
• The collector failed;
• The sensor of control electronics does not show signs of life.

If it is determined that the malfunction occurred in the mechanical part of the corner grinder, then you need to pay attention to the condition of the large gear located on the shaft and to the bushings. If the teeth partially erased or the shaft shafts occur, they need to be replaced immediately.

The most common breakdowns

Malfunctions of the corner grinder happen quite often. Everyone who works with this tool knows about it. What is out of order most often?

The spindle fixation button broke.

Only one awkward press on the spindle fixation button, when the disk is rotated, leads to its breakdown. Sometimes it can be broken if it is used to remove the jammed disk. To prevent this from happening, you need to use an rye key inserted into special holes near the location of the disk.

Drain the teeth of the gear

It mainly arises when jamming occurs. If a roar is heard in the gearbox, this is a sign of just such a malfunction. Когда у шестёренки сломано больше одного зубчика, то угловая шлифмашинка не сможет резать необходимый материал.

In order for the tool to continue work, it is necessary to change the gears, and everything, and even the conical wheel. Before going to the store for spare parts, remember the manufacturer’s company, model and power of the product.

The electric motor does not work.

This type of breakdown happens with an angular grinder that work in places where there is a lot of dust, and when they are given rest, they are left on the ground. The dust that gets inside spoils the winding. Large loads, especially for the low power of the corner grinder, turn out to break off the motor.

If the corner grinder is used to cut materials that create a lot of dust, then it is recommended to cover the places of ventilation holes with something.

The bearing sprinkled

The weakest link, and not only the Bulgarians, are bearings. A large speed of rotation quickly wear out the mechanism. One thing pleases that changing the bearing is easy. Replacing a sprinkled bearing at the corner grinder should be done on time so that there is no breakdown that can no longer be fixed.

Stator malfunction

This breakdown is easy to determine when the angular grinder turned on, but the disk turns are too intense and differ from normal work. which means that in the stature there is a turning point on the winding. The breakdown of the stator is considered the most serious, special skills are needed to eliminate it. When there are doubts in your abilities, it is better to turn to professionals, so that later you do not have to buy a new tool.

If the decision to fix it independently, it begins with cutting the frontal parts of the winding, the remains are all removed. The next step is a new winding on the template. It should be identical in the number of turns, with the same density and from the wire of the same thickness as the previous one.

Gearbox

Corner grinder, whose power is less than 1100 watts are usually equipped with straight.toothed gears. They are on the stature. Bulgarians with greater power have a scooter gear. Each of the options has a cone.shaped shape, the rod of the gearbox of the corner grinder crosses with the shaft of the stator at an angle.

Repair of the gearbox of the corner grinder mainly consists in replacing the gears. In the case of a breakup of a disc toothed wheel, it is difficult to replace it, because it is very firmly fixed. It is easy to disassemble the gearbox:

• It is necessary to unscrew the nut on his part;
• Gently take the rotor housing in the vice and knock out the gearbox body with light blows;
• change the position of a clamped rotor and knock out a bearing through a wooden board;
• unscrew the gear from the shaft.

Revolution regulator

The speed regulator is not present in all Bulgarian models. When the corner grinder is used for cutting, it, in principle, is not needed, but if you grind it, it is simply necessary. If suddenly he stopped working, then most likely, a fee that needs to be removed and buy the same in the store of power tools for further replacement.

Self.repair of corner grinding grounds is not always carried out. If suddenly something does not come out or not everything is clear, it is better to contact the service center.

The reasons

The reasons that the brushes on the corner grinder skeple and wear out strongly: there may be several:

• malfunction or increased wear of the brushes themselves;
• violation of the density of contact between them and the collector plates;
• deterioration of the clamping of the brush spring;
• a breakdown between the collector lamps;
• axial beat of the anchor due to wear of the bearing;
• short circuit in the anchor winding;
• making structural damage to the mechanism during repair.

The reasons listed above are the result of improper operation of the corner grinder or poor assembly of its nodes.

In order to avoid the appearance of sparks in the area of ​​the brushes, you should follow the rules for safe use of angular grinder.

• Do not include with increased humidity, expressed voltage drops in the network, dirt entering the brush unit, contamination of air.conductors in the housing.
• Avoid overheating of the engine, load, slowing down the rotation of the mechanism at the time of operation.
• Do not use a low.power corner grinder for sawing “heavy” materials.

How to understand that you need to change the brushes

Many change brushes only after they find strong sparkling of the tool, as well as the appearance of the smell of Gary. Even these signs do not stop many masters, and they continue to operate the tool until it stops turning on. When it is necessary to change coal brushes so as not to harm the device of the power tool. There are the following signs for this:

• Strong sparking. if signs of severe sparking appear, then it is necessary to disassemble the tool, and examine the consumables. Coming is the first sign that the consumables have to be replaced
• The appearance of the smell of Gary. if the smell of soot is heard during the tool, then it is recommended to disassemble the angular grinder and replace the graphite brushes
• With wear of the main part of more than 30%-40%. However, it is almost impossible to determine their initial length, unless you measure it before installing the elements
• When such signs appear as pulling and “growl” of the power tool

The devices are also replaced if they have uneven wear, and also do not correspond to the quality.

It is interesting!It is not recommended to buy omeled brushes on a home corner grinder, as they will quickly disable an anchor due to a large copper content in the composition. Clushed elements can be used on grinders, which have a special coating on collector plates.

Do.it.yourself

Angle-grinding machine Fiolent MSU2-9-125E with revolutions. Photos all tools.RU

For corner grinder, there will always be use at home, in the country, in the garage or as a professional tool in production workshops. The use of various working tools increases the functionality of the work performed.

Compliance with operating rules increases the service life of the power tool. However, as in any mechanism, in a corner grinder sooner or later there are malfunctions.

Simplicity of assembly/disassembly, the presence of a tool for diagnosis and repair allow you to eliminate breakdowns with your own hands.

The device is corner grinding

The design of the corner grinder consists of an electric drive, the torch of which is transmitted through a gearbox to a spindle with a working tool. In a professional level, supplementary launches, regulators and revolutions are installed on a professional level.

The device of the corner grinder diold MSU-1,5-01 with revolutions (6). Photo 220 volts

Smooth start creates comfortable and safe working conditions with an angular grinder, reduces the possibility of failure of the main working elements of the corner grinder (see. Corner grinding switch with a smooth start).

The presence of an option to adjust the speed expands the possibilities of using an angular grinder (see.

about the turning of the corner grinder), creates the conditions for the lack of work with overloads, which increases the duration of its continuous operation (angular grinding of revolutions here).

Speed ​​regulator

The speed regulator (speed) is present in the composition of the Bulgarians, where the quality of the processed material depends on the speed of the tools.

So, for example, plastic when processing at high speeds may begin to melt from heating.

A working tool that works effectively at certain spindle rotation frequencies is used to clean and grind surfaces.

Adjustment is carried out manually by changing the variable resistance built into the device circuit.

In addition to a variable resistor, the circuit includes an electronic unit that controls the current value.

Electronic control over this electrical parameter with a decrease in revolutions, and hence the power, will maintain the value of the torque on the working spindle and ensure the functioning of the corner grinder.

The electrical connection diagram on the thyristor and the BTA Simistor 12-600, with three or two conclusions

The typical electrical circuit of the controller of the angular grinder is shown at

Here the main element is the Simistor (BT12). Such a circuit is used to adjust the revolutions of the Bulgarians of high power.

The opening/closing of the systemist is additionally carried out using thyristors (D83).

Therefore, the Simistor has three work conclusions: 1.2. ensure the passage of current from the network to the load, 3. controlling its opening/closing.

The revolutions of the revolutions of low.power Bulgarians can be made only on thyristors. They simultaneously act both as locking the organs and control. The need for the third conclusion is absent here. The circuit scheme is presented on

The diode bridge (VD1) makes it possible to adjust the voltage on both half.grades of alternating current only with the help of one thyristor.

With a smooth start

Some specialized microcircuits may have feedback on current, overload protection and smooth starting at the same time. The U2010b chip has such qualities, which makes up the basic component of the scheme below:

The regulator diagram on the u2010b chip. Photo source here

A feature of the device is the absence of a tacracker, which allows you not to complicate the structure of the corner grinder. The block is included in the circuit in the form of an intermediate device between an electric connector and electric drive.

Without loss of power

The easiest and cheapest method for adjusting the speed of angular grinding grinding is based on a change in voltage. However, at low speeds, the torque is significantly reduced, and the corner grinder cannot perform its functions.

Another method is more expensive and complex based on the use of control using a microprocessor. Information for the operation of the circuit with the microprocessor gives the tagker installed on the rotor shaft.

Feedback via the tacrotkor gives almost 100% conservation of torque when the engine speed drops.

Frequent malfunctions, reasons

The corner grinder may not gain speed laid down by the regime, work with their spontaneous change, with jerks and in extreme cases to stop rotating altogether. If there is an option to adjust the revolutions, it may not respond to a change in the position of the indicator of the operating modes.

Some types of malfunctions and ways to eliminate them are considered in the presented videos.

Repair of corner grinder: diagnosis of breakdowns, ways to solve the problem

Do.it.yourself corner grinder repair is a completely solved problem. The main thing is not to rush, understand the design, recall all the circumstances in which it has broken, determine what could be worn out during the work, make diagnostics and start repairing.

Corner grinder and its operation

A corner grinder is called an angular grinding machine (angular grinder). The name of the instrument is due to the fact that it was produced by the Eltos-Uglovoy Grinding plant in g in g. Plovdiv. It is intended to perform work on grinding or pruning of solid material:

The corner grinder in our time is a very necessary tool, so almost everyone has.

There are grinding machines different in power: from 500 watts to 2500, depending on the thickness of the circle. from 115 mm to 230 mm. The most popular in the work are an angular grinder with a power of 1.2 W, and the most used disk is 125 mm thick.

Every year, the choice for this construction power tool is becoming more and wider, but the operating rules are almost not changing. And even if they always adhere to them, sooner or later in the mechanism there are malfunctions, which can be tried to be eliminated with your own hand, collecting everything you need for the repair of corner grinders.

The device is corner grinding

• The rotor is a part of the electric motor, which rotates during operation and is regulated by speed, is also called an anchor;
• Collector. a place on the rotor where the control wire control is located;
• brushes. parts that serve as conductors of the current from cable to the collector winding;
• The gearbox. a mechanism that acts as a drive from a rotating rotor to a spinning disk consists of a spindle, bearing, of two gears (large and gear of the shaft);
• Stator. part of the electric motor in which the rotor works;
• The impeller of cooling of the corner grinder;
• launch button;
• network cable with an electric drive;
• casing of protection;
• corps of corner grinders;
• Additional handle.

All these details can be divided into two parts:

How to disassemble a corner grinder

How to disassemble a corner grinder? Not so complicated process. This does not require special knowledge, but you need to do everything carefully and with caution. Each owner needs to know how to disassemble any working tool, because periodically he needs internal cleaning of pollution and dust that has caught, and his durability depends on this.

At the present time, on the market you can choose different types of corner grinder, which differ in working parameters, sizes, quality. Manufacturers are also different. Whatever the model of the grinding machine you get, everyone has one model of the assembly of parts.

Dismantling of the corner grinder will require some tools, you need only a regular screwdriver or reversing with a ratchet mechanism.

Having prepared a screwdriver, you can start disassembling:

• We unscrew the screws from the housing and remove one side of the product.
• Remove the nut, thanks to which the disk holds, unscrew the bolts of fastening the protective casing.
• Remove the brushes.
• Disconnect the wires from the engine.
• We unscrew the bolts with which the gearbox is attached inside, and very carefully remove it, the rotor is removed with it.
• Unscrew the bolts that hold the stator and remove it.
• We collect the corner grinder back, alternately put everything in place in the reverse order and fasten.

Analyzing the corner grinder, it is important to remember the outline of removal of parts in order to correctly collect.

Typical minor breakdowns

In the event of a malfunction that arose, it is first necessary to exclude elementary breakdowns:

• Corner grinder does not turn on. The corner grinder suddenly became faulty. stopped turning on. In this case, you need to check the serviceability of the outlet, then the fork and the network cord, perhaps, the drive simply does not work due to the fact that the current does not get into the product.
• The cable with a fork is whole, and the drive does not work. You need to check the start button. The repair of the switch of the corner grinder is easier to buy a new button and its replacement. Since it is rarely subject to repair. mainly a plastic thrust of the switch breaks inside. If you want experiments, you can disassemble it by numbering contacts, and back all in place so that there is no closure after assembly.
• The above details of non.counterates, and the angle grinding machine does not want to work. it means that the time has come to check the brushes. Perhaps it’s time to change them in a corner grinder. The brushes from work are constantly warming up, so they quickly wear out and more often than other details need to be replaced, moreover.

Significant malfunctions

Having excluded all minor breakdowns, it is necessary to figure out why the tool does not want to turn on, and how to repair it. Most likely, the malfunctions are serious, requiring additional knowledge. This happens in cases if:

• deformed body;
• He jammed one of the bearings;
• an anchor or stator does not work;
• The teeth of the gear of the gearbox were broken or erased;
• The collector failed;
• The sensor of control electronics does not show signs of life.

If it is determined that the malfunction occurred in the mechanical part of the corner grinder, then you need to pay attention to the condition of the large gear located on the shaft and to the bushings. If the teeth partially erased or the shaft shafts occur, they need to be replaced immediately.

The most common breakdowns

Malfunctions of the corner grinder happen quite often. Everyone who works with this tool knows about it. What is out of order most often?

The spindle fixation button broke

Only one awkward press on the spindle fixation button, when the disk is rotated, leads to its breakdown. Sometimes it can be broken if it is used to remove the jammed disk. To prevent this from happening, you need to use an rye key inserted into special holes near the location of the disk.