Playing the corner grinder after replacing the brushes. Causes of sparking

Corner saglifier grinder after replacing brushes

The most important thing when selecting the sequins of the electric motor is to know the parameters of the developed brushes. In addition to geometric sizes, a new brush should match the grade of graphite, type and cross section of the wire. It is not necessary to take the same brand as the original, but the hardness of the electric motor brush and operating modes must match

The thickness of the wire should not be less than the original, and the flexibility correspond to. Basic errors when selecting brush contact:

It is not necessary to take the same brand as the original, but the hardness of the electric motor brush and operating modes must match. The thickness of the wire should not be less than the original, and the flexibility correspond to. Basic errors when selecting brush contact:

• Installing more hard graphite contact to where softer were used. The result may be the rapid wear of the collector.
• Installation of “universal” brushes everywhere. This can violate the operating mode of the device.
• Orientation when buying a brush on marking graphite on the side of the old electric motor brush. Graphite labeling is not a marking of contact parameters!

How to replace yourself

What could be easier than replacing brushes on a corner grinder. However, there are some nuances that should be taken into account so as not to spoil the power tool. First you need to choose the right consumable elements. When choosing, you should rely on the model of the corner grinder or remove the installed brushes, and remove their size. For these sizes, buy new elements. It makes no sense to talk about how much such devices cost, since these are mere trifles.

After the consumables are purchased, the brushes are replaced. At the same time, first you need to look at the model of corner grinder. Some manufacturers equip their power tools with special mines to quickly replace brushes. They are a plastic cap, which is twisted and twisted with a screwdriver.

If it is a corner grinder, which does not have a special mine for quick replacement of brushes, then you will need to disassemble the case to get to the consumables. When access is obtained for replacing consumables, further actions are performed in the following sequence:

• Having gained access to the brush holder, it is necessary to disconnect the contact wire from it
• Disconnect the contact wire, which is also connected to the brush holder
• Remove the erased element
• Clean the place where the brush is installed, as it should move freely and without jamming
• Install a new part in the order of reverse removal
• Before installing the brush holder in place, it is necessary to inspect the collector. If there are signs of soot, then they should be eliminated
• Similarly, carry out the procedure for replacing on the other hand

Knowing how to change the brushes on the corner grinder, you should immediately replace them. The stronger the devices sparkle on the power tool, the sooner they need to be replaced. When replacing, it is also necessary to consider that it is necessary to change the devices of a paired, but not one at a time.

Summing up the work done, it is worth noting that there are a lot of causes of sparkling brushes on the corner grinding, and in each case you need to look for your breakdown. If it is not possible to determine the causes of sparking, then the tool must be shown to a specialist who will reveal a breakdown and eliminate it. This is better than continuing to work with a faulty tool that can burn or close at any time. Only with the right approach to the repair and maintenance of the power tool, can it be achieved by prolonged operation.

What spare parts for the Bulgarians change independently, and how to properly serve the power tool

Corner grinder in the house. like a telephone connection. When she is working. no one remembers about her. It is worthwhile to break down. it immediately becomes obvious that the tool cannot be dispensed with a day.

Independent repair of this useful electrical appliance can even be a novice master. And for this you need to know what spare parts for the Bulgarians can and should be changed yourself.

To begin with, consider the device of the corner grinder:

• Anchor. Inner mobile engine component. Usually one whole with a working shaft, through which the energy of rotation is transmitted to the gearbox.
• Collector. The switching board of the anchor. Through his contacts, the operating voltage from the brushes is applied.
• Electric brushes. Contact elements pressed to the collector plates.
• Stator. External engine winding inside which the anchor rotates. Located along the inner contour of the tool body.
• Gearbox. A mechanical component that reduces the momentum on the working shaft, while increasing the torque.
• Corps, holding handles, launch key, revolutions regulator, power cable.

A detailed description of what the angular grinder consists of

One of the components usually fails, so the expression “corner grinding gripped” in a sense is in a sense.

If the case is intact, and the winding has not burned out, it is quite possible to restore the tools of the tool on your own. Spare parts for Bulgarians are available in specialized stores. And you can choose the right part even for a rare model. Most components are unified.

Self.elimination of malfunctions angular grinder

As a rule, breakdowns in the corner grinder are associated with the electric part. Mechanics breaks only with untimely maintenance (especially the lack of lubrication).

The malfunction is cheaper and easier to prevent when its first signs appear:

• sparking inside the corner grinder, in the area of ​​electric grinding;
• fuzzy trigger operation;
• The revolutions change spontaneously;
• The engine turns on. turns off when the tool position changes in space;
• Corner grinder suddenly stopped working.

No matter how trite it sounds, you first need to check the voltage in the network and in the outlet, or the extension cord from which the power tool is written. Then check the serviceability of the supply cable.

It is necessary to open the corner of the corner grinder, and check the integrity of the supply wire visually and with the help of a tester. Reliably connecting the contacts of the device, intensively bend the cable, observing the indications of the indicator on the tester.

If a cliff is detected, replace the wire entirely, or restore the fracture with a refractory solder. Then reliably isolate the repair site of the heat.ousse tube. Island for such a case will not work.

If the cable is working. we move on to a typical malfunction most often on the corner grinder. Seeing the symptoms is quite simple. the corner grinder sparkles inside the case during operation.

Why brushes burn in the corner grinding machine?

In the attached figure, the electrical circuit and the device of the components of the electric motor are clearly visible.

Image of the tool electric motor

The angular grinder engine operates in extreme conditions. Despite protection, dust gets inside, most often in the form of small metal sawdust. Metal. as you know, is a conductor.

When it gets into the contact zone of brushes and collector, microsypses occur and copper plates are very warming up. Melting and mechanical connection of the collector contacts may occur.

Type of the electric motor collector to be repaired

In this case, the brushes overheat, and the working surface intensively burns out. Hence sparks and increased wear. Another reason why the brushes sparkle is to get inside fine sand and wooden dust.

When the collector is contaminated with sawdust. the contact between the brushes and the collector is disturbed, and sparking occurs under the intensive load, with all the ensuing consequences.

Therefore, for prevention, it is necessary to periodically disassemble the body of the corner grinder and clean the dust from the collector.

It is necessary to periodically blow the angular grinder engine.

This simple procedure will extend life, both brushes and an anchor collector. After each dusty work, it is advisable to at least sprinkle the corner grinder, especially in the area of ​​ventilation holes.

How to replace brushes on a corner grinder?

As a rule, brushes along with a spring block are inside the handle of the tool. This design allows you to save on the production of the case, and make it more compact, and, therefore, convenient.

The brush holder is in the instrument handle

There are specimens in which the fasteners of the brushes are made out of the case. This on the one hand allows them to inspect and replace them faster. However, it is better to change the brushes in combination with cleaning and lubricating the power tool, so the case still will have to disassemble.

It is also advisable to extract the rotor from the stator, and measure the resistance of the windings. It should be the same.

Measure the resistance of the windings in the rotor

Then you should clean it from dust, grease the bearing and, if necessary, grind the contact plates of the collector with sandpaper. zero. After this procedure, the grooves between the contacts must be cleaned with a hard brush from copper dust. A working collector should look like this:

Examine the brushes, and in the case of chips, cracks, and other signs of wear on them, replace with new. In the set of corner grinders, when buying, there is often a spare kit.

If this was not, it will not be difficult to find a suitable copy in the construction market or in specialized service stores. These are standard spare parts, so you can always choose the right.

Do not take a larger brush with the aim of staring them under your seat. The material is very fragile, easily breaks.

Graphite brushes need to be selected individually. Spare parts may not approach another tool

How to choose and replace brushes for corner grinders

One of the most popular, both in household and professional use, tools for repair and construction work are the angular grinder, or angular grinder (angular grinder).

Corner grinder, like any working tool with electromechanism, is especially susceptible to loads.

Despite the protective impact.resistant case, small elements of pollution and dust fall inside, which sooner or later leads to the failure of individual parts or the entire mechanism as a whole, namely, the work of the collector’s contact with brushes is disturbed.

In the work of this tool with a metal that is a conductor, the penetration of its particles into the part of the contact of the collector and brushes leads to the closure and overheating of the copper plates. This, in turn, leads to the melting and enhanced burnout of the brushes, as evidenced by the sparks that appeared.

Since when using a corner grinder cannot be avoided by all kinds of pollution (sawdust, dust, etc.), replacing brushes is an integral condition for the correct operation of the tool.

over, the brushes are most susceptible to wear. It is not surprising that the brushes that failed, sparkle and burn.

The brush is a hexagon with parallel equal faces and with electrocontact, using them a current is carried out to the collector.

If the corner grinder during operation suddenly began to work with jerks or twitch, first of all you need to look at the brushes. With a timely detected wear, the smell of Gary will arise, and the tool itself will completely stop working.

Thus, for the safe and efficient operation of the corner grinder, it is necessary to control the mechanism of action of electric grids, and for preventive purposes regularly clean the collector.

Replacement brushes corner grind

In most models, the electric shoes are inside the handle (see. a photo). This location is due to savings in the production of the case, as well as more comfortable operation of the tool in connection with the compactness.

On some other models, for the convenience of quick replacement of brushes, the screws are located directly on the case. In any case, it is more advisable when replacing brushes also clean and lubricate the entire tool, and for this it is subject to disassembly.

Regardless of the location of the electrode, first it is necessary to disconnect the corner grinder from the electrocope. Tips are removed, a visual inspection of the holder’s design is performed, and brushes are pulled out, as shown in the photo. If chips, scuffs and other designs are detected, they are replaced by new.

Usually, along with a corner grinder, when buying, a spare rem. a set in which there are brushes. They can also be purchased at any specialized store. It can be difficult to choose the right ones for some models of the Bulgarians, so brushes are purchased slightly larger than the right size and are carefully sawn. In case of distinguishing the tips, the leash from the old brush is attached to the new.

Interskol

The models have an INTERSKOL angular grinder to pull out the brushes, it is necessary to remove the back cover of the stator case. Then the screws from the holder are twisted.

Wear of elements is determined by their residual length. The length of the workers of coal brushes cannot be less than 5 mm. For a more detailed study of the technology of changing brushes, you can watch video.

Bosch

Access to electrostatic plates at the angular grinder of Bosch is carried out by opening the stator body handle, which is held on the screw. The length of the workers of the coal.type electrical panels should be at least 8 mm. By the way, carbon electrographs for Bosch are characterized by the presence of a device that suspenses the operation of the tool when the brushes of the minimum operating length reach.

Makita

A screw is twisted into the corner grinder Makita, and the back cover of the case is removed. Coal brushes with auto shutters are used in the Makita 9565 model.

The choice of electric grinders

Brushes are characterized by dimensional, forms, manufacturing material. Previously, they were produced in the form of a structure consisting of copper wire and a current.led brush. But due to very fast wear, such a design was decided to modernize. Currently, electric shows are made by pressing at high temperatures of carbon material.

It is impossible to underestimate these interchangeable elements of the mechanism, because the engine service life depends on the proper operation of the brushes, because, by replacing the brushes in time, you can protect the angular grinder from the destruction of the anchor collector plate.

• Graphite brushes. In the production of graphite, it is associated with a special composition in which soot can be added. Further under the pressure, the mold occurs, and after firing. The difference in the production of such brushes is due to giving the material additional strength and resistance to wear. Are made of carbon materials (graphite, soot) and binders. After the standard molding procedure, graphitization follows, which involves the temperature firing of 2500-2600 ° C in specialized furnaces. Such electric shows are the most common for the use of Bulgarians. Despite the relatively increased price category, the advantages of properties overlap high cost;
• Coal brushes. The main material for the production of these brushes does not differ from graphite. The difference in production technology is the absence of heat treatment, which reduces the cost of production. Hence the low price tag in stores. But the wear resistance of such brushes is slight.
• Metallographic brushes. The composition of the raw materials for the manufacture of brushes includes not only graphite powder, but metal. Mop powder is mainly added, but lead, tin or silver can also be added. In this case, the metal base of the powder contains about 80%. Such brushes are used in generators and electric motors, t.to. They are highly wear.resistant and reliable. But they are very rarely used in household electrical appliances. The price category is high.

Before buying, it is better to look at the instructions or in those. The passport of the corner grinder, which brushes are recommended by the manufacturer. Also, at the choice of the necessary brushes, you can consult in service centers.

Reasons why brushes sparkle

Very often you can see how the brushes sparkle on the corner grinder. Signs of sparking through ventilation holes in the power tool case are found. Masters are interested in why the brushes on the corner grinder sparkle, even after their direct replacement. There are many reasons for this, and in order to understand this, you must have an idea of ​​the device of the power tool. If you know how the angle.grinding machine is arranged, then understand why the brushes skeve strongly, it will not be difficult.

The reasons for the strong sparkle of brushes on the grinds are the following factors:

• Malfunctions of the anchor winding. If there is a violation of the insulation of the anchor winding, then in the end this contributes to the development of inter.flip circuit, as well as the closure on the core. In addition, a break in the winding may occur, which will eventually cause an increase in the load. A characteristic sign of a malfunction of the anchor winding is a reduction in revolutions, an increase in noise and a drop in power
• The brushes are poorly pressed against the collector. A spring is responsible for the clamp of the main part, which over time of operation loses its original springy properties
• The rotor winding broke off from the copper plate of the collector. this phenomenon is extremely rare, but when the power tool is overloaded, it may well occur
• The centering of the anchor of the electric motor is violated, which ultimately contributes to a strong sincerity of the brush on the corner grinder
• The form of the collector is broken. The collector, consisting of copper lamellas, has a cylindrical shape, which can be disturbed during the rewind of the rotor. With the slightest deformation of the shape of the collector, sparking of brushes will occur
• Insulation violation between the collector lamps. Each collector plate is isolated by each other, and in case of violation of the mycanite insulating layer, sparking occurs. Isolation between the plates can also be disturbed due to the settlement of the graphite layer in grooves
• With wear of the anchor bearings. If the bearings are faulty, then a beating of a rotating anchor occurs, and as a result, signs of sparking arise
• The curvature of the rotor shaft. It is difficult to bend it, but if this happens, then the engine begins to work with a load. So that the tool does not fail, it is recommended to replace the rotor
• When improperly soldering the ends of the anchor wraps to the copper plates of the collector. Such errors are not made at the factory, but they can allow the winding that rewall the anchor of the power tool
• Non.suitable composition of graphite brushes. The parts under consideration are made from coal and graphite, while adding different types of impurities. This is done for a reason, and in order to use the brushes depending on the voltage and the speed of rotation of the shaft. Graphite is soft and hard. The lower the supply voltage, the softer the grade of graphite is chosen. For high.voltage power tools, it is necessary to take hard brushes, which do not have copper
• Lamelian deformation due to their heating. If the corner grinder experiences excessive loads, then a deformation of one or more collector lamellas may occur. The plates are lifted relative to the rest, as a result of which the contact is violated. Such a malfunction causes strong sparking of brushes during the operation of the power tool
• Bad contact at the connection of the brush. If the terminal is not released with the device, then the result of such a violation of contact can manifest itself in the form of excessive spark
• The presence of soot on copper plates is periodically or regularly recommended to clean the surface of copper lamelons from soot. Narar usually manifests itself due to the wear of the brushes, therefore, when blackening is found on the surface of the collector, it should be wiped with alcohol

Often masters, after they change the brushes on the corner grinder, observe the phenomenon of excessive spark. Based on the above factors, you can identify the cause, and eliminate it before the tool is out of order. The elements under consideration are inexpensive, however, due to their improper choice and application, the power tool may break. To find out what malfunction is the cause of severe sparking, you will need to disassemble the power tool, and make it inspection, as well as call the rotor winding.

Why brushes burn on the corner grinder

In addition to sparking, often the owners of the power tool are faced with the fact that the brushes on the corner grinder are burning. This phenomenon differs from sparking in that the rapid wear of the main part of the element occurs. Immediately after the installation of new elements, they are worn out immediately with the first use of the power tool. It is necessary to figure out why brushes on a corner grinder are burning.

The main reason is not hidden in the brushes themselves, but in the collector. If lamellas fall on the collectors or abrasion, then this leads to an increase in the load. This load is experienced by graphite elements, which, when the angular grinder is turned on, begin to wear out quickly. this process of accelerated wear is called combustion. Elements literally burn due to a large current passage. Many call this process abrasion, but in reality the brush can quickly erase from mechanical exposure. The cause of combustion is severe sparking, as a result of which graphite is literally burning.

The reasons why the brushes on the corner grinder burn are as follows:

LASTING or wear of the Copper Lambels of the collector. What the wear of the collector lamella looks like, shown in the video. The material also shows how to try to eliminate such a malfunction

There is also such a thing as a circular fire. This phenomenon arises with large shocks of the anchor current, for example, during overloads, short circuits, as well as with a decrease in the network voltage. Circular fire manifests itself with re.ignition of the arc. Increasing the load and even short circuit occurs when using a corner grinder for sawing wood. When processing wood, a cutting of the cutting disk occurs, thereby the current increases 15-25 times from the value. Most often, the causes of combustion of elements are a collector, so if you have to change 2-3 pairs of brushes in a month, then it is time to diagnose the power tool.

The brushes sprinkle on the corner grinder what a malfunction

Checking and repairing the anchor of the corner grinder at home

As said Shakespeare: “Nothing forever under the moon”. Home equipment, as it would not sound annoying, are no exception. It happens that the most reliable mechanism burns out.

And you need to prepare this fact without panic, with firm confidence that there are no hopeless situations.

How the angular grinder arranges, what malfunctions are, how to check the anchor of the electric motor, find the cause of the breakdown and remove the problems? Cognition of the device of the main components of the power tool will allow the master to independently diagnose and repair the angular grinding machine.

Features of the asynchronous motor of the corner grinder

In fact, in numerous electrical appliances used in everyday life, asynchronous electronic engine is used. The fundamental advantage of this type of motor will be that when the load changes there, the speed does not change.

This means that if, for example, for a long time and without stopping, cut a stone with a household corner grinding, no external signs of motor overload will be noticeable. The speed of rotation of the disk will be unchanged, the sound is plain.

Only the temperature will change, but this is an option and not even see if the hands are dressed in gloves.

With an inattentive attitude that game slots possesses into a defect. Asynchronous engines are very sensitive to overheating, a significant excess of the operating temperature entails melting insulation on the winding windings.

At first, the motor works with interruptions, and then. when an interval curly closing will occur, the engine will stop completely. It is worth a couple of times to overheat the engine of the corner grinder and, it is more possible that the anchor will melt.

Already today, from the highest temperature, contacts connecting the wires of the primary winding with the collector are soldered, which leads to an interruption of electronic current supply.

How to find a malfunction of the anchor of a corner grinder

Signs of breakdown of the anchor of the corner grinder are: high sparking of brushes on the motor collector, vibration of the motor at low speeds, rotation of the working shaft in different directions. If such symptoms are located, the work should be finished with the inventory. this is unsafe. Suspicions are simply checked using light tests.

An eye examination outside

Search for a malfunction should start with a visual examination of the corner grinder:

• Carry out a general inspection of the instrument.
• Study the integrity of the network cord, the presence of voltage in the outlet.
• Using the voltage indicator, make sure that the current enters the motor collector and launch button.

Inspection of the device from the inside

If everything is in order with food, but the corner grinder does not work, you will have to open the body to access the motor. Usually, disassembly is not difficult. However, you need to adhere to ordinary rules that will avoid problems at the time of the revolutionary assembly:

• Certainly turn off the device from the network before disassembly.
• Remove a working disk and a protective casing from a spindle.
• Open the case in a well.lit place on the unspoken surface of the table.
• Understand the placement of all parts and nodes before disassembly. It is recommended to draw or photograph the device device.
• Self.tapping screws and screw screws lay in a separate place so as not to get lost.

To inspect the motor is much more reliable under catchy lighting, so that our client remains perfectly distinguishable. The anchor should spin freely around its own axis, the correctly working bearings are not obliged to make a sound during work.

The anchor is not traces of the melted wiring, the winding of the circuit is necessary, without breaks. Of course, smell the rotor. With inter.flip circuit, insulating varnish burns out and issues a stable specific smell. Alas, for such diagnostics you need a certain experience.

The chain calls by the tester

If the visual inspection has not given obvious results, it is recommended to continue the examination using a multimeter.

Having set the switch to the switching of the modes to the Ommeter position (spectrum of 200 Ohms), you need to “call” two adjacent lamellas of anchors. If the resistance on all turns is monotonous, this means that the windings are working.

When a tester indicates another resistance or a chain break on any pairs-a malfunction in this coil.

The wiring rupture sometimes occurs between the winding and core. It should intently examine the locations of the coils with the collector lamps in the bottom of the anchor, visually check the rations of the contacts.

Corner grinder sparkles on brushes,-repair/Makita 9555nb Sparks on Brushes, Repair

In this video, the all.fought breakdown of this model of the corner grinder is considered, the stator was failed as.

Sprinking brushes on a corner grinder?

If there is no tester, get out of the position of course with a regular 12.volt light bulb. Power and possibly at least any, normal 30–40 watts.

The voltage from the battery of 12 volts must be supplied to the fork of the corner grinder, inserting a light bulb into the tag of the wire textbook. With good anchor, if you twist the spindle with the hand, the light should glow, without changing brightness.

If the intensity changes, this is a sure sign of interitral short circuit.

On the contrary, the light does not burn, then this indicates the next:

• There may be a freezing of the brushes in a non.working position. A retaining spring worked.
• There was a breakup of the supply circuit.
• The closure came out as it is also called the gap in the stator winding.

There are other diagnostic methods, however, they require more complex equipment, which on their own usually does not use. The most experienced master will determine the breakdown with the highest degree of accuracy, using the “punch” in other words, a simple transformer with a cut.cut thoroidal core and one primary winding.

Where of course to save the anchor and return it at home

If damage to the anchor is set with guaranteed accuracy, the part must be removed from the electric motor. The disassembly of the motor must be created with special accuracy, after removing the brushes and disconnecting the nutrition terminals. The rotor is removed, coupled with supporting bearings and impeller of cooling of the motor, they make up a single whole with its help.

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.

Questions and answers

Long coal-graphite peppers can be shortened with a file or file, gradually growing a contact end. If the brush is too short, you will have to either put a longer spring, or look for other nickels.

It is required to replace the spring. It is important to ensure a tight fit of the graphite to the collector.

There are brushes of the desired size, but the plastin locks are completely different. It is not possible to fix the coal nickle in the nest.

You can carefully solder brass pits from old brushes to new.

Repair masters often use the details of famous manufacturers: Bosch, Makita, Hammer and others. They serve 2-3 times longer than brushes of unknown firms.

It is necessary to check if the button is good, to inspect the collector planes again. They must be clean. During the repair, thin wiring could be damaged. They need to be rolled up with a multimeter.

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 sparking of 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.

How to replace the brushes on a corner grinder

Very often, the manufacturer of corner grinding machines compels its products with a spare pair of brushes (graphite contacts that allow transmitting an electric current to a rotating rotor).

Does this detail wear so intensively that it is only provided for adding? If you use the tool from case to case, then the brushes will survive the owner himself.

But if you operate the corner grinder daily, then, indeed, their wear will be significant. And the day will come when a slightly centimeter graphite rod is wiped to a thin plate.

It is impossible to allow the maximum wear of brushes so as not to damage the rotor contacts. Check the condition of the rods periodically, after developing in tens of hours.

Replacing brushes

This is where the concrete question arises for manufacturers of the Bulgarians, why not make a window from transparent plastic in the housing in order to visually evaluate the condition of graphite contacts without analysis of the power tool (in some models of the Bulgarians there is no need to promote the housing)?

Attention! Starting to replace the brushes, as with any penetration of the power tool inside the housing, it is necessary to turn off the power supply power by extracting a plug from a socket from a socket.

In view of the structural diversity of angular grinding machines, replacing graphite contacts in each model of the tool can have its own characteristics.

The most elementary way, without disassembling the case

Some manufacturers approached the possibility of replacing brushes very rationally. In the case of the machine there are threaded traffic jams. And the whole process of checking or “repair” takes two minutes (for both graphite contacts):

• Dill out the plug with a screw.
• Put a thin screwdriver with a thin screwdriver and remove the brush.
• If the brush compared to the new one lost 70. 80 % of the length, then it should be replaced. Otherwise, the old graphite contact must be made by the same side as it was before extracting to exclude the process of grinding. After all, brushes wear out unevenly due to the fact that they come into contact with a rotating cylindrical surface.
• Plunge the cork. Attention! The cork can be screwed up and upside down. Therefore, you need to make sure that there is a groove under the screwdriver on top. Otherwise, there will be difficulties in the next toleration.
• Repeat all actions with a brush located on the back of the corner of the corner grinder.

This is the easiest way to replace the brushes in a corner grinder that does not provide for disassembling the case. Therefore, when buying a new tool, this nuance can be taken into account.

corner grinder without a rear handle

In grinder that does not have a rear handle, the brushes are replaced in the following sequence:

• Display a self.tapping screw from the end of the corner grinder.
• Tighten the protective cylindrical casing.
• Pull the cap from the contact unit.
• Put a thin screwdriver with a squeezing lid of the brush and stretch the graphite rod.
• Insert a new brush, close the contact block with a lid.
• Repeat all actions with another brush.
• Put a casing on a corner grinder and fix it with a self.tapping screw.

Often there is another method of fastening brushes. In this case, the sequence of actions will be as follows:

• Remove the casing, previously remove the self.tapping screw.
• Free the brush from the clamping strip spring, pushing the last screwdriver.
• Extract a brush from the guide block, hiding with a screwdriver.
• Remove the contact of the brush from the connector. Also with the help of a screwdriver.
• Combine the contact of a new graphite rod with a connector, insert the brush into the guide block and press the spring.
• Repeat all actions with the second brush, close the body with a casing and screw it with a self.tapping screw.

These are the two most common ways to replace graphite contacts. Although other options for grinding designs are not excluded.

corner grinder with the rear handle

The corner grinder with the rear handle allows you to get to the brushes in a slightly different way: in a simpler way:

• Near the handle it is necessary to find a small repair window closed by a plastic plate, which is recorded by a self.tapping screw.
• It is necessary to unscrew the self.tapping screw, put a plastic plate in the groove with a screwdriver, remove it from the case, opening the repair window.
• The following actions to replace brushes are the same as that of low.power Bulgarians: free the tape spring (1), free the plug (2), remove the brush from the guide block by the wire.
• Then insert a new brush, connect the plugs, fix the graphite rod with a tape spring, close the repair window with a plastic plate and screw the screw.
• Repeat all actions with the second brush located on the opposite side of the body.

It is possible that other methods of replacing graphite brushes, due to the structural features of grinder may exist, may exist.

Structurally corner grinders differ from each other, so the technique of replacing brushes can differ slightly from the basic methods described above. But general features are still visible:

• The brushes are located next to the posterior handle or the place of the case designed to hold the tool.
• The most common designs of graphite brushes: with a spring and without it.

The first type of design involves a simplified way of replacement, because it has a wire, a contact plate, and a clamping spring.

Non.free brushes require a slightly more time.consuming replacement process, because the fixing spring is attached on the case and it is more rigid, and the wire is attached in a separate place using a plug.

How to replace brushes on a corner grinder reference to the main publication

Why are the brushes burn, what are the causes of the malfunction

The occurrence of sparks in the place of contact of the brushes and the collector is inevitable.

At the time of the transition from one lamella to another, an electric arc occurs, very short in time. a large number of revolutions and in space. insulating inserts between the lamellas are very thin.

In a good tool, sparking is almost imperceptible, but as the corner grinder is operating, it intensifies. Strong continuous sparking speaks of malfunctions and requires immediate maintenance of the brush-collection unit.

Holes in the corner grinder of Makita GA9020. Photo 220 volts

In most models of the Bulgarians, sprinkling brushes can be seen through the ventilation holes in the back of the case. Of course, you can look into the corner grinder only when it was working “idle”.

If your corner grinder is arranged so that the zone of touching the collector brushes is not visible, an external sign of a malfunction. increased heating of the body in the area of ​​the brushes (electric arc and bad contacts are always accompanied by heat release). The best way to prevent malfunctions of such an angular grinder is to reduce breaks between technical services.

The main causes of increased sparking, methods of elimination

• The brushes are poorly developed. The defect can appear after replacing the brushes. If the brushes of a new machine sincone strongly. a defect laid down by the manufacturer. (For genuine products of well.known authoritative brands, this is not found.) The method of elimination. to give an angular grinder to work without load, at idle.
• The brushes “hovered” (usually hang one at a time, not both at once). The gap between the brush body and the cluster of the brush holder is clogged with dust and the brush cannot move freely. Open the brush nodes, extract brushes, remove dust from clips, blow, rinse the knots. Install the brushes and check the freedom to move them.
• The gaps between the lamellas are clogged with coal dust. Peel a hard brush, rinse, blow the collector.
• Significant wear of brushes. The “short” brush is overwhelmed in the guide brush holder, the edges of the contact surface are painted. Replacing the brush.

Elimination of the above faults by an ordinary user with minimal qualifications.

Carbon Brush Ryobi brush for angular grinder Ryobi Eag600rs. Photos all tools.RU

We continue to list the causes of increased sparking and ways to eliminate them.

• Increased transition resistance brush-collector. Signs: The formation of a continuous dark film of oxides (“Feast”) on the surface of the collector. The reason is the excessive value of the switched current due to overloads in the work. Method of elimination is to go to the collector, for which to give a corner grinder to the workshop.
• Collector’s surface wear. The reason is the use of brushes of other manufacturers, or just a large “work experience” of a corner grinder. It is necessary to repair (proceed and pass) the collector of the rotor assembly in the workshop.

Important. Do not follow “harmful” tips such as “clean the collector with a skin-linen”. Without a complete disassembly of the corner grinder, there is no access to the collector. An operation such as grinding the collector, “on the knee” and even the “skin” cannot be done correctly, unless you have a round grinding or at least a lathe in your country house.

No need to try to “clean the gaps between the lamellas with a sharp tool”. There are no gaps there, and insulating inserts are easy to damage.

Do not try to “grease the collector with special oil”.

Treat the maintenance of corner grinding and its brush nodes calmly. Everyone is subject to the processes of natural aging, and electric cars are also.

Emergency situations with an engine, such as an inter.seal closing of windings and the occurrence of a “circular fire” on the collector, we will not consider. They are indirectly related to brushes.

For information: We have a section on our website where references to repair workshops and service centers for Bulgarians in different cities are given.

How to choose a quality brush?

When choosing a crafts for angular grinder, pay attention to the bristle. It should be distributed evenly throughout the disk, the bristles should be the same length everywhere and throughout the circle of the cup to be distributed evenly. It is unacceptable when the bristles are thickened on one edge, and on the other. thin. Such a brush will beat in the hand (vibrate), cleaning will be carried out unevenly, and the brush itself will soon fail.

Among the parameters for the wire nozzle, manufacturers indicate the recommended revolutions for the machine. This indicator should not be ignored. If you put a brush for low revolutions on a machine with a high rotation speed, it will not give the desired result and quickly fail. Vice versa, the metal brush, which the manufacturer developed for operation at high speeds, will not work with due performance at low speeds.

The smaller the diameter of the cup, the lower the load on the machine engine, the less vibration, and, accordingly, the hand tires less. But the larger the diameter of the cup, the less passages are obtained. What brush to choose? There is no unequivocal answer here. Sometimes masters manage to try several brushes of different diameters and different stiffness of the bristles before they find the best option. The choice of the roof often depends on the quality of the paintwork. After all, as you know, different enamels and primers have different coating density.

Checking and repairing the anchor of the corner grinder

What wants to see the prime owner of the house in his “baggage” of power tools? Everyone, without hesitation, will answer this question for a second. the drill. And immediately add. and, of course, an angular grinder! After all, it is she who will help to cut metal, ceramics, brick, concrete, asphalt, stone or wood; perform work on arranging niches, arched and doorways. Using this power tool, you can clean the surfaces from rust, soldering spray and influx; get rid of welds or just polish the metal to shine. Corner grinder will become an indispensable assistant in other types of home repairs.

Whatever the corner grinder (corner grinder) has a reliable design, during operation, some nodes and parts fail. A breakdown of anchor working in fairly strict conditions is often the reason for the lack of normal functioning of the electric drive. In the article, the master plumber will consider the methods of repairing or replacing the anchor of the corner grinder.

The anchor of the angular grinder engine is a conductive winding and a magnetic circuit in which the rotation shaft is pressed. He has a lead gear at one end, on the other a collector with lamellas. The magnetic circuit consists of grooves and soft plates covered with varnish for isolation from each other.

In the grooves, according to a special scheme, two anchor winding guides are laid. Each conductor makes up a half of the turns, the ends of which are paired on the lamella. The beginning of the first round and the end of the latter are in one groove, so they are closed to one lamel.

By purchasing a power tool, few people think that someday he will fail. Breakage happens to any electric tool, regardless of the price and the manufacturer’s company.

• Club of conductors.
• Interpretation close.
• The breakdown of isolation to the mass is the closure of the winding on the metal case of the rotor. Occurs due to the destruction of isolation.
• Slopics of collector conclusions.
• Uneven wear of the collector.

The main causes of the breakdowns of the Bulgarians, including their anchors, can be considered:

• Mechanical wear. brushes most often suffer.
• Non.compliance with the operational “passport” mode of operation. anchor and stator.
• Overload and voltage surges in the mains. stator and rotor.
• The failure of small details. bearings, fixers, nuts, washers, etc.
• Falling, blows and other careless attitude to angular grinder. hull breakdown.
• Lack of preventive cleaning. gearbox malfunctions or breakdown of the VCL button./Off.

If the anchor is faulty, the engine overheating occurs, the insulation of the winding is melted, the turns are shortened shortly. Contacts connecting the anchor winding to the collector plates are soldered. The current supply stops and the engine stops working.

The volume of repair work allows you to determine competent diagnosis of rotor damage. The specifics of the formation of defects that most appear when overheating of the corner grinding of the grinder during prolonged work at increased loads allows you to determine them visually.

Standard diagnosis involves a visual analysis of the device. It is necessary to analyze the integrity of the wire and the supply of current to the motor collector. With normal feeding, the angular grinder should be examined from the inside. To disassemble the device will not be difficult. It is best to photograph the location of the main modules of the device when analyzing. After disassembling, conduct a visual test of the anchor on the following properties:

• The stroke of the anchor must be free;
• The absence of black spots and smells that may talk about melting the winding, the insulating varnish of which leaves traces;
• The absence of crumpled turns and soldiers of solder, which leads to a short circuit;
• There should not be burnout on the lamella contacts, otherwise the binding of the Lameli Petushka and the shirt of the winding should be checked;
• Lack of worn out or burnt records;
• The space between the lamellas should not contain graphite residues from the brushes.

If there are no deficiencies during visual inspection, then it is necessary to check with devices. The anchor on the corner grinder can be checked both using a tester and using a regular light bulb.

The multimeter is set to the Ommeter position. The resistance of 200 Ohms is set. The probes are connected to the lamellas located next to each other. If the value on the device is less than 1 ohm, then there is a short circuit. With a value of more than average, the presence of a break in the turns is possible. With a high resistance or absence of any value (in the case of the use of a digital device), one can also judge the break.

There are situations when the cliff is not detected. Then a breakdown is done. With maximum resistance, one of the probes is placed on the shaft, and the other moves along the plates. If the value is zero, then there is no damage. Then the rotor is checked in the same way by the multimeter. The probe in this case moves through the lamella. If it is impossible to check the test, the light is used.

In the plot. How to check the anchor of a corner grinder

In the plot. Checking the collector engine anchor

In the absence of a device at hand, many are interested in the question of how to check the corner grinder for possible anchor breakdown. The supply supplier wire is torn, and a light bulb is placed at the gap of one wire. Then the shaft rotates. By changing the brightness of the light bulb, you can judge the closure between the turns. In the absence of combustion, the following conclusions are possible:

• The location of the brushes does not correspond to the working position due to the operation of the retaining spring;
• Rupture of the supply contour;
• Closing or rupture in the stator winding.

Popular brands: Practice, Wortex, Sibrtekh and others

Radial soft brush with a slope for angular grinder. Photo practice

There are a large number of foreign enterprises in the manufacturing and sales market for cord.shaped:

All manufacturers offer several names of brushes, giving customers a choice.

And a little more about Lessmann brushes.

Safety precautions

In the process of working with metal and wooden products, it is necessary to observe safety precautions. The high speed of rotation of the cordor leads to its wear, as a result, small bristles, scale, and other pollution fly off the nozzle.

Significant loads can be brought to a fault brush. So that flying garbage does not harm the master should use a dense jumpsuit or suit, mittens, as well as a respirator and glasses that can be replaced with a mask.

A working corner grinder loudly makes noise, so it is recommended to use headphones.