Corner grinder smokes and sparkles the air

The transshipment of the engine and overheating of the battery is reported by the defense indicator

In the process of work, all the units of the corner grinder (corner grinder) heat up and if you do not take any measures to protect the corner grinder from overheating, the tool can simply fail. What happens when overheating, that is, when exceeding the operating temperature of the corner grinder? Of course, all details will be subject to linear expansion, lubrication will lose its viscosity and simply flow out, thus increasing the friction force between the details of the corner grinder. Not to mention the fact that the tool will be impossible to hold in the hands, and this is fraught with sudden injury.

In most cases, an electric motor is prone to overheating, which can be protected in different ways. In modern structures of the Bulgarians, an indicator is provided, which lights up when the temperature reaches up to 130 ºС, when the temperature value rises to 160 ºС The engine slows down, but when this value reaches 200 ºС, the power supply is turned off. There are models where temperature control is limited only. What is interesting is that some owners of the Bulgarians are unhappy with such automation and spontaneous stopping due to overheating. But it is better to make an extra “smokers” than to give the electric motor for repairs.

The case of the angular grinder gearbox Makita GA5030

The most frequent overheating is defeated by the gearbox of the corner grinder, inside which the gear of the gear rotates. Of course, the lubrication and ventilation of the gearbox itself remove a certain amount of heat released as a result of friction of the parts. But the material of the case from which the gearbox is made also plays an important role.

Now more and more often they began to make it from metal instead of plastic, and the metal, as you know, removes heat better. Although it leads to weighting the total weight of the tool, but compared to the effect of heat removal, you can put up with this. It should be noted that the term “metal” means a strong aluminum alloy, which has high thermal conductivity.

The impeller can also be involved in the cooling of the electric motor, the teeth of which are not made at right angles to the rotation axis, but with an inclination. which improves heat withdrawal.

I bought for one-time work angular grinder FAG-180/1300 “summer cottage”. I am not a supporter of such tools, but I chose on the basis of the price, since I considered the angular grinder to take an angular grinder at a time, but I have not been able to rent an angular grinding clock while the corner grinding in the “business” was not in the “case”, but I was idling It has already tested it and found an interesting fact: after 1-2 minutes of work, the gearbox heats up very much (it is difficult to hold his hand with difficulty). Hence the question: is this a normal phenomenon for such cheap angular grinders or is there a defect that will subsequently go into a breakdown? The gearbox opened: it has a lot of green lubrication.

Promalporum

You are not entering. Interskol theme SECTIONS Search. Interskol: The gearbox on the corner grinder is heated down from 1 to 12 of Commentauthor Cardanoff IP: I recently acquired an angular grinder, noticed that even with minimal loads and short work, the gearbox was heated. That this is the promotion or lubrication did not? And what grease to use? CommentAuthor minskmaster IP: I am sure that lubricants there are plenty of not to say that the hand does not tolerate, but hot. There are no noise, but a friend has a corner grinder of truth, it works quieter and softer.

Posle 10 Minut Rabota U Etogo Perferatora Takoy Nagrev Chto Nevazmojno Daje Prikasatca. Patskajite Kakoy U Nego Defekt I Kak Ustranit. Commentauthor cerberos IP: She simply does not. How to smear, do not tell me? Litol will go, or what special lubricant is required? I used a lubricant, dark blue, I don’t know the name, before it was complicated to lubricate the crosses in the car. Well, you can also lilet, if there is nothing else. He is still lubricant.

For all the time of working with Interskol, there was not a single similar case, today the gearbox is quite stolen, but the gear is dry. Commentauthor aijca Ip: A Wedding Will BE, Principal, By Far The Most Special Ocasion Within Your Lifetime. Wedding Ceremony May Feel The Lifestyles, BecAuse Its Your Own.

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Corner grinder smokes and warms up

Any power tool may eventually fail. This is usually due to violation of the rules of its operation. The angular grinder is no exception. If you have such a nuisance, do not panic and immediately call the master, because in most cases you can eliminate the malfunction yourself.

To do this, you need to know the basics of electrical engineering and understand the design of grinding machines a little. Then it will be considered how to repair the corner grinder with your own hands.

Spindle fixation button

If the button flew out, then you can’t work with such a corner grinder.

Since the spindle can spontaneously sink to the gear and block it during operation.

The fixation unit consists of a spindle with a rubber ring, springs and a plastic button.

  • To replace the button disassemble the gearbox.
  • Remove the spindle from the body.
  • Put the spring on the button from the inside.
  • Insert the spindle into the gearbox body from the inside, and the button outside. Press to the click.
  • Collect the gearbox.

Why is the engine on the corner grinding cause the reason

Vibration characterizes the violation of the balance during rotation. We need to disassemble and look. gearbox, bearings on the engine shaft, their integrity. For starters and if you want to understand yourself. The main thing is that such an instrument cannot be used categorically.

Vibration within reasonable limits has a place to be in any manual power tool, especially in corner grinder (corner grinder) and grinder. And heating also takes place to be.

The concept of “heated” I think you need to compare with the state when the hand attached to the body does not tolerate, and strong vibration is if it is not comfortable to work with the tool.

The cause of vibration in the corner grinder may not be a correctly fixed disk (factory marriage) when bearings “sing a dying song” will also be vibration and heating. Gear gear, or rather, poor gearing of gears (backlash), another reason for heating and vibration.

If the grinder of the machine (corner grinder) has vibration, roar and head (gearbox) is heated. then unfortunately it is slowly coming to an end, repairs will help, but as practice has shown, this is already incurable!

This happens due to the production of grooves with gear with the engine shafts and gearbox!

The shafts are not fermented and with incorrect or inept use, jerks, clamps and shocks of discs on the surface occur. the grooves are knocked out over and over again, and over time they begin to hang out there, rattling, the gears are warming up and vibrate!

Replacing bearings, dowels and shaft of the gearbox. you will slightly reduce the symptoms!, Since the same trouble is on the engine shaft (rotor). there are very large engine speeds in the corner grinder, so repairing with improvised means is impossible, and replacing the rotor, gearbox shaft, whales, bearings and bushings will cost it very expensive, so get ready to buy a new grinder and improve the skills of working with a corner grinder. you need to work confidently, feeling the strength and load on the device, then it will last a long time! Source

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

Corner grinder, being the most popular tool in the house, is subjected to considerable loads and intensive use.

Because of this, after some time, it happens that when starting the engine, jerks, the smell of Gary and other malfunctions appear, leading to the idea that the corner grinding machine (corner grind.

But do not immediately carry the device for repair or buy a new. Most of the malfunctions of this device can be eliminated independently.

Diagnosis of the electric part angular grind

As mentioned above, most often the angular grinder refuses to work due to the breakdown of the electrical part of the unit. For the correct diagnosis of electrical circuits of the tool, the wizards for the repair of electrical equipment are used by a special device. a tester.

If you pressed the assembly button, and it does not work, then in 90% of cases the cause of the breakdown is not so serious that you cannot repair the angular grinder with your own hands.

Experts advise adhere to the basic rule of repairing power tools: move from simple to complex.

First of all, it will take a check of an electric cable and a fork at its end. If it is collapsible, then spin it and check the reliability of the contacts. Otherwise, you will have to disassemble the angular grinder (remove the casing of the device) and “call” the cable by the tester, and also make sure that the current is suitable for the “Start” button contacts. If the device shows a break, then the cable should be replaced with a new.

The situation when the current enters the button, but does not go further (when the position is turned on), indicates a malfunction of the switch. The button cannot be repaired. It must be replaced with a new one, but first march the contacts removed in order to connect them correctly in the future. When the contacts are incorrectly connected, the engine winding may burn out.

If when checking it turned out that both the cable and the start button are working, but the current does not enter the brushes, then it is necessary to clean the contact plates of the brush holders. In case of ineffectiveness of this procedure, it is recommended to replace the brushes. Further, if everything is fine with the brushes, and the current comes to them, you should check the rotor and the stator for the presence of circuits and cliffs.

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

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

The anchor of the electric motor

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

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

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

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

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

The safest Metabo Compact Angle Grinders without limits English

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

REDUTOR Repair

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

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

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

Repair of the stator corner grinder

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

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

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

corner, grinder, smokes, sparkles

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

What can a grinder do?

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

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

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

What is the difference between professional grinding machine and household?

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

The main features of a professional angular grinding machine are:

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

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

Device and electrical circuit of corner grinders

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

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

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

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

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

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

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

All components of the electric motor perform certain functions.

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

How to disassemble a corner grinder

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

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

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

Having prepared a screwdriver, you can start disassembling:

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

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

Features of the design of the tool

Interskol is the leader in the development, production and sale of various power tools recognized by world manufacturers. Interskol products are distinguished by ergonomicity, simplicity and ease of maintenance, environmental friendliness, increased capacity. Interskol angular grinder is classified according to the diameter of the disk: 115,125,150,180,230. Among lovers of craftsmen, two classes of two classes are particularly popular with their own hands. In the presented classes, several models are produced, distinguished by power. In the class of 125 mm, 4 (four) models Interskol are produced: angular grinder 125/900, angular grinder 125/1000, angular grinder 125/1100E, angular grinder 125/1400EL. In the class of 230 mm, 10 (ten) Interskol models are produced, which differ from each other in power. Classkol Classkol Corner 230 are produced by a power exceeding 2000 watts.

Interskol label grinder 230/2300 is deciphered: an angular grinding machine with a maximum circle of 230 mm, with a capacity of 2300 W.

In the Interskol Bulgarians, the angular grinder 125 driven gears on the spindle are attached due. INTERSKOL Corner Grinding Corner Grinding 125 are collected in one case that serves as a handle.

In the Interskol Bulgarians, an angular grinder 230 on the back of the case has a comfortable back handle. These are powerful professional machines with a two.handed design. At the angle grinders of this class, the driven gears are pressed on the shaft of the spindle.

In the proposed repair instructions, we will consider the schemes of two classes of the Interskol Bulgarians: angular grinder 125, corner grinder 230.

Homeples turned a monkey into a man

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

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

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

Immediately disassembled and revealed the reason.

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

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

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

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

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

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

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

How to disassemble a corner grinder

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

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

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

Having prepared a screwdriver, you can start disassembling:

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

Metabo WEVA 15-125 Quick

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

How a corner grinder arranges

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

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

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

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

Typical malfunctions of the Bulgarians and methods of diagnosis and repair

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

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

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

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

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

The degree of sparking

The quality of switching, according to GOST 183-74 (Table 1), is estimated by the degree of sparking (switching class) under the running edge of the brush, that is, under the edge, from under which the collector plates come out with their rotation. The degree of sparking 1, 1¼ and 1½ and are allowed in any operating modes.

Degree of sparking (switching class) of electric machines

Weak point sparking under a small part of the brush

Lack of blackening on the collector and soot on brushes

How to understand that you need to change the brushes

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

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

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

It is interesting!It is not recommended to buy omeled brushes on a home corner grinder, as they will quickly disable an anchor due to a large copper content in the composition. Clushed elements can be used on grinders, which have a special coating on collector plates. https: // YouTube.COM/Watch?v = wt0n_ecswve%3f

Do.it.yourself

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

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

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

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

The device is corner grinding

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

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

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

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

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

Speed ​​regulator

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

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

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

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

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

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

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

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

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

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

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

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

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

With a smooth start

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

The regulator diagram on the u2010b chip. Photo source here

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

Without loss of power

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

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

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

Frequent malfunctions, reasons

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

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

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

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

Corner grinder and its operation

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

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

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

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

The device is corner grinding

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

All these details can be divided into two parts:

How to disassemble a corner grinder

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

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

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

Having prepared a screwdriver, you can start disassembling:

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

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

Typical minor breakdowns

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

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

Significant malfunctions

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

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

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

The most common breakdowns

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

The spindle fixation button broke

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

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