Corner grinder does not work under load. How to disassemble a corner grinder

Detection of a breakdown and repair of corner grinders, detailed video about the repair angular grinder

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.
• Interpreter short circuits of the stator and rotor windings. Rewinding the coils or replacing these parts with 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.

Electric circuit

Knowledge of the appointment of the main parts will not give a 100% positive result in repair. It is also necessary to figure out and understand how the electrical circuit of the corner grinder is arranged and how the electric motor works. Two windings are involved in the diagram, which are sequentially connected through the power wire to the network with a voltage of 220 V and are not interconnected in the electrical circuit. The mechanically installed circuit breaker binds to the power button and disconnecting the grinder. Each of the windings is connected through contacts with graphite brushes. Through brushes, the windings are connected to the rotor collector.

It is also very important that the anchor has many windings, however, only two windings are connected to graphite brushes, and the failure most often occurs due to a rupture of the electric circuit. Diagnosis of the electrocope of the device is carried out by a special device. tester. A portable measuring device is used not only in the repair of corner grinders, but also to check other electrical tools and devices.

The correct check should be made from the input power cable with the transition to the sequential elements. When checking conductivity, the multimeter switch is set to the minimum voltage.

Malfunction of the electocepe of the collector motor

Most often, the breakdown in the electrical circuit of the corner grinder occurs for the following reasons:

• Collector wear;
• Breakdown button;
• Wear of coal or graphite brushes;
• Overheating and short circuit in the stator winding;
• Overheating and burning of the rotor winding;
• Damage to the power wire.

Such malfunctions are the most frequent, but there are other breakdowns associated with the break in the electric circuit.

Why the electric motor brushes sprinkle.

In the process of work, devices with a collector electric motor can spark. Strong sparking often indicates an imminent breakdown of the tool. It is necessary to figure out the reasons for the appearance of increased sparking and take measures to eliminate it. The article discusses the most likely reasons for the appearance of this negative phenomenon.

The basis of devices with electrical motors of alternating current is the brush-collection module that provides the electrocontact of the rotor with the static part of the electrical appliance. This module consists of two parts: a collector located on a rotor and brushes. sliding contacts located outside the rotary part and pressed to the collector. Sparking on a collector electric motor appears as a result of mechanical interaction of mobile and motionless parts. The contact between the collector and brushes is periodically interrupted, which leads to the transitional process in the electrocope and entails the appearance of a spark. The brushes of the electric motor collector are the most short.lived part of the structure. Therefore, over time, various problems can be observed related to their work.

Even on a working electric motor, there is usually a weak spit of brushes. If the electrical appliance turns on normally, develops the momentum at full power and at the same time sparking is inconspicuous, then there are no reasons for concern.

The reasons for the sparkle of the electric motor brushes

We will analyze the most common malfunctions of the brush-collection unit.

1) stress wear. With a strong wear of these elements, the electric motor does not develop speed at full capacity, and also may not turn on (constantly or periodically). In this case, when the electrical appliance is turned on with a screwdriver with an isolated handle, you can press the brush to the anchor. If there is an increase in engine speed, then the problem is identified correctly. Most likely replacing worn parts with new ones will correct the situation. Sometimes it is also required to replace the springs of the brush holders.

2) Interpreter closure of the anchor winding. A malfunction of devices with electric engines may be a breakdown of anchor. In this case, sparking in the area of ​​both brushes will be observed, in addition, the anchor winding will be very hot due to the fact that a current of a larger value is received for other ones than others. When repairing this malfunction, the anchor winding is rewinded or the part is completely replaced.

3) failure of the stator. With a breakdown of the stator, only one of the brushes is usually sparkled. To check it, it is necessary to measure the resistance of the windings. The same resistance of both windings (usually 4 Ohms) indicates a good stature. Different resistance on the windings suggests that the stator is faulty and its winding must be rewound.

4) Closing of the collector contacts. As a result of wear of contacts, graphite dust forms, which accumulates between them, closing their. In this case, during the operation of the electrical appliance, large sparks are observed. To eliminate the breakdown, it is necessary to clean the intervals between the contacts from graphite dust. It is also necessary to check the brushes of the collector, since with their correct location and properly selected form, dust appears in a minimum amount.

5) pollution of collector contacts. When contaminating contacts, both brushes will spark the soil, the electric motor will not be able to develop speed into full power. Nar on the collector appears when it overheating. Poor electrical contact will lead to an increase in the resistance in the element, which in turn will lead to even greater sparking and soot. In this case, it is necessary to clean the collector’s contacts from the car. This is done with sandpaper minimum grain paper

It is important when cleaning not to spoil the contact form. Therefore, special pads should be used for cleaning

At home, you can use an electric screwdriver for cleaning. The anchor is clamped in the cartridge, spinning at minimum revolutions carefully lean the sandpaper against the collector. The direction of rotation of the anchor during cleaning should coincide with the direction of its rotation in the electrical appliance.

Small breakdowns and their elimination

In cases where the corner grinder refuses to turn on when the start button is pressed, the reason can be insignificant and, most likely, the repair can be done without the help of a specialist. In this case, you need to be guided by the main rule. to start with the simplest knots and move to more complex. In this case, the reason for the breakdown of the corner grinder may be the wiring on the section of the power wire and brushes.

First of all, it is necessary to turn off the angular grinder from the network, and then inspect the cable for damage. After that, you need to disassemble the housing and check the connection of the power button and brushes. If the wire is damaged, it can be replaced with a new, and the torn electric circuit is restored. If, after checking the cable and the electric circuit, the current comes to the mechanism, but the start is not made, then the problem may be in the start button itself.

You should check the button and eliminate it if the malfunction is detected or replace the button

The button must be carefully disassembled, while it is desirable to mark the terminals and wires

When connected, it is important to correctly connect the contacts, since the wrong installation can cause blocking the winding and jamming of the anchor

After checking the operability of the power wire and the button, you need to check the speed controller, which is available in some models of the angular grinder

If the malfunctions are not detected, then you need to pay attention to the brushes and, if necessary, replace them, as well as clean all the contacts

Graphite brushes are faulty

The main cause of the malfunction may be brushes. Depending on the loads and duration of the angular grinder, the brushes can last six months, a year or two, then worn out, and the tool may stop working. Replacing old parts with new ones is made with a cable turned off and a disassembled case. Using a screwdriver, you need to unscrew the brush holders and remove the old brushes. They can also be closed with plugs in the housing, and then the case will not have to disassemble.

Brushes should only change to similar in size and material, and after replacing the brush is rubbed. the corner grinder works for a while. With a faulty start button, it is forbidden to work with a corner grinder, as this can lead to jamming of the cutting disk, its destruction and unpredictable consequences. Speed ​​regulator is a smooth launch of a corner grinder, and after malfunctions in its work, it requires a replacement, since the repair will be difficult and almost impossible.

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.

Does not develop turns and smoke

The stability of the revolutions of the spindle working shaft largely depend on the presence of malfunctions of the components of the electrical part of the corner grinder. In the next video, the stator winding burned out, as a result of which smoke occurred, and the corner grinder stopped rotating. The failure of the stator is easily determined visually: cliffs of wires, burning insulation.

But the rotor, although he was covered with soot, should be diagnosed with the help of devices described in the article on the link “Checking, the anchor of the angular grinder with your own hands”. In this case, he was suitable for further work.

Hearing

Poor contact in the compounds of the electrical part of the Bulgarians leads to a strong heating of the body, the formation of increased sparks due to the deviation from the nominal values ​​of the electrical parameters. In the next video, contacts on the brush holders burned out. Perhaps this happened due to a violation of the location of the brushes, which led to a large formation of graphite dust and the creation of additional resistance on the collector node. The author proposed a variant of a more reliable connection of contacts and straightened the location of the guides for brushes.

Loses speed under load

In the next video, the corner grinder during operation spontaneously changed the speed, from the case of the case, there were a jerk. In this case, the option of adjusting the revolutions on the corner grinder was absent. One such jerk led to a breakdown of a cutting disk. After which it was decided to find and eliminate the malfunction. Diagnostics of the electric part when the multimeter is called that the power button came out of the system (start).

Since such buttons are usually not suitable for repair (when disassembling it, a fully worked contact was found), the author found a replacement. Functionally the new button duplicated the old one, but was somewhat different in size. The author successfully chose a new location for her and the corner grinder restored its performance.

Why greatly sparkles in the area of ​​the brushes of “corner grinding”?

With normal operation, a slight uniform sparking is observed inside the case. If it is too strong, the brushes must be replaced. The problem arises in the following situations:

• Damage to anchor winding. an interval closing occurred or a section of the winding broke out.
• Violation of contact between the winding and the collector plates.
• Insulation violation between the collector lamps.
• The strongly worn-out bearings of the “corner grinding”, which provoke the beating of the anchor angular grinder, which is why the brushes skeve strongly and burn.
• The use of brushes, the characteristics of which do not correspond to the turnover and voltage in the network.
• Overheating of the electric motor with too long continuous operation.

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.
• Interpreter short circuits of the stator and rotor windings. Rewinding the coils or replacing these parts with 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.

Why does the angular grinder do not turn on?

Most of the problems of the corner grinder are associated with the electric part. The tool may not turn on for the following reasons:

• a cable is damaged or the fork is faulty;
• The trigger button failed;
• strong wear of brushes or lack of contact between them and cable;
• The failure of the rotor or stator windings is the most serious reason why the “corner grinder” is not launched.

It is advisable to solve problems with an electric engine in a specialized workshop in which qualified specialists work and there is modern diagnostic equipment and tools for repair.

Repair of the stator corner grinder

The reason for the failure of the grinder stator can be determined. To do this, you need to pay attention to interruptions in work. The rotor can develop speeds exceeding the permissible, which will indicate the inter.seal closing in the winding. Many breakdowns can be eliminated only in service centers, but for uninterrupted work you can carry out timely cleaning, lubrication, replacement of brushes and bearings.

The failure of the stator of the corner grinder of Makita rarely occurs, and the cause may be constant overheating of the corner grinder. In this case, the case heats up greatly, and the smell of Gary appears in the ventilation ducts. The stator winding may have a short circuit or break, so without special devices to determine the malfunction and repair the device is difficult. For repair, a corner grinder with your own hands or replacement of a stator must carry out the following actions:

• Reducer dismantling angular grinding grinding;
• Rotor dismantling after removing the mounting plan;
• Removal of stator protection;
• Removing the screws of the stator mount in the case;
• Removing the handle cover and turning off the food wires;
• Extracting the stator.

The stator is tightly installed in the case, so the extraction process can be accompanied. Most often, the stator is subject to replacement, but sometimes amateurs can do rewinds on their own.

Repair of the grinder of the grinder

In most cases, repair is carried out after improper operation. This can be constant overheating, excessive loads, untimely replacement of brushes and entering foreign particles with a collector plates. It is possible to determine the malfunction of the rotor of the angular grinder of the DWT 180 to increase the spark on the lamellas of the collector, the appearance of the smell of burning and smoke. Such consequences can lead to a malfunction of the gearbox, accompanied by a knock and hum as a result of destroyed teeth.

To prevent the rotor breakdown, you need to prevent overheating of the corner grinding, clogging of ventilation ducts and dust and other particles entering them. It is necessary to change the brushes, lubrication and use circles of the diameter in time, which is provided by instructions for operating.

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.

Do.it.yourself

Angle grinding machines (corner grinder, corner grinder) under the German brand Bosch are of high quality, reliability and durability. The main competitive advantage of Bosch angle grinders is the widespread use of innovative technologies in the manufacture of the product.

But German quality cannot resist Russian negligence. Improper use of the tool, untimely replacement of lubrication, coal brushes, bearings leads to the failure of the tool.

In order to repair the Bosch angular grinding machine, you can go in two ways: give the corner grinder to the service center or perform repair of the corner grinder of Bosch with your own hands.

The first option is more costly and not always of high quality. The second option can only be carried out if the consumer has a great desire to figure it out on its own.

Bosch corner grinder circuit will help to carry out repairs on your own.

Bosch corner grinders are conditionally divided into low-power up to 1000 watts, and powerful over 1000 watts are labeled GWS 7-125, GWS 20-230 or others.

The first digits 20 or more indicates the power of the tool of more than 1000 watts. The second number 230 certifies that this is the maximum diameter of the detachment circle.

The first digit of up to 20 indicates the power of the tool up to 1000 watts, and the second about the maximum diameter of the cutting circle up to 125 mm.

Nature, types of malfunctions angular grinding (Bulgarian) and methods of repairing with your own hands

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.

Mechanical plan malfunctions

Corner grinder is used to execute polishing, grinding or cutting manipulations. When working, this tool is subjected to very significant loads. In addition, it works in difficult conditions (dust and dirt).

Strong loads during operation angular grinder when cutting significantly wear out both gear cloves and bearing.

The most common mechanical malfunction angular grinder is the destruction or wear of a sliding bearing on the braid of the gear of the gearbox.

Solving the problem simply if there is a description, scheme and recommendations related to repair.

Rearing sliding bearings

The most important “vulnerability” of the corner grinder are the bearings are considered to be precisely. And although there are only three of them in the entire structure, it is these elements that often determine mechanical breakdowns. So, the bearings have a negative impact:

• use in maximum mode;
• too fast rotation;
• insufficient volume of lubricant fluid;
• getting particles of dirt and dust;
• untimely/incorrect replacement of coal brushes or their deformation.

The design of any variety of Bulgarians provides for the operational replacement of bearings.

Malfunctions related to deformation or wear of this element imply the occurrence of extraneous noise.

Damage is detected by checking the backlash of the shaft, that is, by means of swaying to the sides when installing the tool. If there is a backlash, then a sliding bearing must be urgently changed.

In order to repair the bearing, it must be pulled out of the case and removed from the gearbox.

This detail should be dismantled using a special puller. The bearing can be removed from the rotor using the folk methodology. To do this, you need to insert metal strips or keys in the vice. The bearings should be laid on them and with the help of a massive hammer and metal instructions to be bred from the shaft axis.

The level of wear of the gear of the gearbox can be checked by the contact spot. The gearbox is cleaned in advance from the old lubricant. You need to apply a special blue on the smallest gear of the details, and then crank.

Next, it is necessary to remove a large gear with oblique cloves and look with a magnifying glass at the contact spot, which ideally should be at least fifty percent of the clove surface. Otherwise, the gear will need to be replaced or change the profile of the clove.

However, this breakdown can be eliminated only by a master with extensive experience. Often cut, licked or deformed gears are subject to complete replacement.

We disassemble the gearbox angular grinder

In the process of repairing the gearbox, the most time.consuming work is considered to be the dismantling of the gear and support bearing.

The disassembly procedure itself begins with opening the cover and turning off the stator and rotor. The latter is clamped in a vice in order to unscrew the nut that attaches a small gear.

A spindle bearing is pressed in the gearbox. In order to get it, sometimes you need to dismantle the lock ring.

If the bearing is very deformed, it is easier to get it with a screwdriver.

A large spindle gear can be fixed in several ways:

Almost all models of the Bulgarians have the same electrical circuit. Rotation from the rotor is transmitted using the gearbox directly to the working element. The rotor rotates in the stature.

The tool is controlled using a button that regulates the revolutions and coal brushes that transmit the voltage to the collector.

Equipment power is provided by a connecting cable.

Electric breakdowns

So, the most common electrical faults include:

• damage to the power cable at the inlet to the corner grinder;
• wear or deformation of coal brushes;
• faulty launch button;
• short circuit or a cutting of the stator;
• short circuit or cliff of the rotor;
• wear or stratification of collective lamellas.

It is recommended to determine electrical breakdowns using a tester or other device. The corner grinder is characterized by a fairly simple electric circuit that does not need special knowledge. You just need to be extremely careful and follow the safety rules.

Causes of strong vibrations “Corner grinding

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If you have stopped working “angular grinder”, if it makes noise, vibrates much or overheating, it is recommended to contact the service center, in which they will not only eliminate the current problem, but also diagnose all the tools of the tool.

Mechanical malfunctions

From mechanical damage, the wear of the bearings or their complete destruction is most often found. Signs of the problem can be increased vibration of the corner grinder, increased noise, as well as excessive heating. You can remove the bearings even if there is no puller, you just need to gently knock them out, it is advisable to heat them before that. After replacement, it is necessary to lubricate the bearings with lithol or cyatim.

Also, due to the prolonged use of the angular grinder, the teeth of the gear of the gear or a breakdown of one or more teeth often wear out, this can be determined visually. If wear is very small, then this can be corrected with a superstil. With high wear, you will have to change the gear.

If you have to use corner grinders often, do not forget about the preventive maintenance of the tool, but specifically cleaning the nodes, complete replacement of all lubrication, timely replacement of worn parts.

Do not allow the angular grinder to work for a long time under load at reduced speed compared to idle speeds, try to prevent the instrument for jamming.

Mechanical malfunctions of corner grinder

To determine a malfunction of this type? It is necessary to disassemble the body of the corner grinding and the body of the gearbox of the corner grinder, which is made of a metal alloy.

The main mechanical breakdowns belong to such parts of the corner grinder:

Grinding tools are often damaged? and the most common cause is the destroyed gearbox or its wear. Such malfunctions are caused with excessive load on equipment during operation. In this case, the teeth of the gear of the gearbox can also be wear out and collapse. The principle of repair is in the process of replacing parts, and at the same time special skills are not required.

Replacing the gearbox

Bearings are very important elements of the power tool. After the bearing breakdown, it must be replaced immediately, since its malfunction can lead to other mechanical breakdowns and to damage to the stator and rotor. A negative effect on bearings can have:

• Prolonged operation of corner grinder with high load;
• Lack of lubricants;
• Entering foreign particles;
• Increased speed of rotation.

After wear or destruction of the bearing, an unpleasant extraneous noise appears. You can check the condition of the bearing after disassembling the corner grinder and check the back of the bearing on the shaft. When swaying the bearing in different directions, the backlash should be absent or to be minimal. After detecting the bearing malfunctions, it must be changed using the puller, and the clip of the destroyed bearing can be removed using a tap screwed into the clip. You can remove the bearing according to the folk method, using two rocks, vice and hammer.

Reducer disassembly and repair

The most difficult thing when repairing the gearbox is to remove the gears and remove the support bearing. For disassembly, it is necessary to remove the lid and disconnect the stator body from the rotor. Next, you need to unscrew the nut of the mounting gear, if it is provided by the design. There is a bearing in the gearbox cover, which is stretched after removing the locking ring. The driven large gear is attached with a locking ring, and with the help of improvised tools it can be removed. The gear is pressed on the spindle and attached with a key.

In some types of Bulgarians, the gear can be attached to a threaded connection. The repair of the gear consists in replacing them. A stop fixer is necessary for the convenience of fastening a working disk with a flange mount. The lock is a rod with a spring and if necessary by pressing it prevents the rotation of the working shaft. It is almost impossible to fix such a latch, it must be replaced.

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.