How to make a small bosha grinder. DIY Bulgarian button Repair

How to disassemble a small grinder: instructions for disassembling and checking

The owners of the power tool are well aware that any equipment needs periodic maintenance. Some nodes require lubrication, others wear out and are subject to replacement. But most often, the masters operate the device until the details begin to get out of the body. And then you have to take emergency measures to restore the normal operating mode of the tool. How can you find out what has broken, check the grinder for performance and perform repairs with your own hands?

Why is the Ushm used and how it works

The corner grinding machine (Ushm), or “Bulgarian”, firmly entered the household and production life of not only a artisan, but also a simple layman who likes to comfortably solve locksmiths and carpentry problems. The popularity of this power tool is due to the simplicity, versatility and multifunctionality of use.

With the help of various additional nozzles of the grinder, metal can cut, grind various surfaces, clean them of rust or old paintwork. In the arsenal of Ushm there are functions such as sharpening cutting tools, strokes of concrete walls, cutting ceramic tiles or stone.

Bulgarian device

Structurally, the Bulgarian is an electric motor with a capacity of 500 to 2000 watts, which converts the power of electric current into rotational movement. The same purpose is a planetary gearbox consisting of two main gears with a straight or conical gear. The rotation of the spindle of the working shaft is carried out in direct transmission mode, the speed is determined by the ratio of the number of gear teeth. Some grinders are equipped with an electronic unit of the smooth start of the engine and adjusting the speed of rotation.

Professional Ushm with engine speed adjustment

Type of electric motor. Asynchronous, single.Phase. Electrodegent force occurs when the rotor winding interacts in the magnetic field of the stator, motionlessly fixed in the case. Thanks to the angular transmission of the rotational moment, the level of safety during operation is significantly increased. In the case of jamming the disk in viscous material, there is no reactive rotation of the tool body, which prevents the possible injuries of the operator.

Diagnostics of malfunctions in Ushm work

Signs of improper work of the grinder for a sensitive ear and a vigilant eye appear long before the actual failure of the tool. Before finally broken, the Bulgarian usually begins to give distress signals. It can be:

• Increased vibration of the body during operation;
• Excessive sparking of collector brushes;
• Uterine buzz of the motor during inclusion;
• The crackle of the gearbox with broken teeth or dried up without lubrication with gears;
• Braining the rotation of the rotor shaft or their piercing creak during acceleration;
• A specific smell or even smoke emanating from the Ushm case.

If the first symptoms of incorrect work have appeared in the work of the grinder, it is urgent to diagnose the device and find the cause of the problems. To do this, check the two main systems of the device. Electrical and mechanical.

Checking the electric part

The electric part of the grinder consists of:

The electric motor, in turn, is divided into two main parts. Stator and rotor (or anchor).

The task of the master is to sequentially check all these systems and detect the causes of malfunctions in work. This will need a multimeter or tester.

Universal tester for diagnosing the electrical part of the Ushm

Checking the power circuits

First of all, it is necessary to check the integrity of the network power supply. Many turmoil can occur only due to the fact that the cable has damage and the power of the device is uneven. The cord should be completely intact, without signs of damage. During work, he should not warm himself or spark in the places of excesses and connections with a socket or a grinder. If at least one of these conditions is not met, the cord should be repaired or replaced.

Using a tester included in the voltmeter mode, check the input voltage in the Ushm, it must correspond to passport indicators: 220 V. In the ammeter mode, the current consumed is measured. It should not exceed the value of 6 A.

Checking the start and control unit

Next, testing the start buttons and the electronic control unit. Perhaps the contact group of inclusion of the device in the operation was oxidized or clogged. If the device is equipped with a smooth starting system, the disk should accelerate to operating speeds gradually, without a sharp set of speed. Using the multimeter, you need to make sure that the voltage when turning on the button is transferred to the electric circuit.

If during the work of the grinder it was noticed that the brushes at the place of contact with the collector are excessively sparkled or the disk rotates unevenly, spasmodically changing the number of revolutions per minute, then most likely the stator windings or anchor are involved in this. Since the stator is less susceptible to overloads. It only creates a magnetic field, then most often attention should be paid to the ROOTOR of the electric motor.

Diagnosis of the rotor. How to “call” the anchor by the tester?

To make sure the rotor is working, it is necessary to “call” it by the tester.

Having installed a multimeter tolerance to the position of 200 Ohms, to sequentially measure the resistance of the windings on two neighboring lamellas of the anchor. If the resistance is the same everywhere, then the anchor is intact and is efficient. If the tester shows a different value from the lamellas of the lamella, in this place there was an interval circuit. The anchor is subject to repair or replacement.

Interpretation circuit, as a rule, occurs when the tool overheating during operation. The insulation of windings is melted and this leads to the fact that neighboring turns consisting of a copper wire come into contact. As a result, the balance of the electric motor is violated and this leads to a power failure at a certain position of the anchor.

Features of the design of the corner grinding machine Bosch

The peculiarity of the design of the Bosch grinder is presented in the use in the gearbox as a supporting bearing with a driven braid of the gear of a needle bearing.In Bosch perforators, the led gear on the spindle shaft is attached by pressing.

In the Bosch Boshki small power, in which straight.Toothed gears are placed in the gearboxes, the installation of adjusting gaskets is provided. This design allows you to restore the operation of the contact of the gears, reducing the thickness of the gasket. The braids of the tools wear significantly less straightforward.

The work environment of the Bulgarians is most often dusty space. Dust is the main danger leading to the failure of the power tool, falling in love and grinder.

Do.It.Yourself

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

Ремонт блендера Bosch

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

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

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

Bosch Bold Scheme will help to carry out repairs on your own.

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

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

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

Features of the design of the corner grinding machine Bosch

The peculiarity of the design of the Bosch grinder is presented in the use in the gearbox as a supporting bearing with a driven braid of the gear of a needle bearing.In Bosch perforators, the led gear on the spindle shaft is attached by pressing.

In the Bosch Boshki small power, in which straight.Toothed gears are placed in the gearboxes, the installation of adjusting gaskets is provided. This design allows you to restore the operation of the contact of the gears, reducing the thickness of the gasket. The braids of the tools wear significantly less straightforward.

The work environment of the Bulgarians is most often dusty space. Dust is the main danger leading to the failure of the power tool, falling in love and grinder.

Tools necessary for repair

To repair the Bosch grinder, you can’t do without a tool. We’ll make a reservation right away, if you have a screwdriver, then this will significantly accelerate the process of disassembling and assembling the tool.

But you can do with a set of screwdrivers, preferably with a ratchet mechanism. You can’t do without an an eve of a key, which you will unscrew the nut nut of the leading braid of the gear.

It is better to have a special puller for dismantling bearings.

Diagnosis of the electric part can be carried out using a tester or a device for determining a short circuit of the turns.

It is especially useful for determining the malfunction of the rotor or stator without removing the knot.

The Bosch Bulgarian Scheme will help to carry out repairs on your own, and this instruction will help to adequately cope with any problem.

Disassembled Bosch Bosh with your own hands

For the owner of the power tool, knowledge of its device and the ability to disassemble is a mandatory task.

Knowing the procedure for disassembling the grinder allows you to independently perform work such as replacing lubrication, changing bearings and coal brushes.

To disconnect the gearbox of the poses.821 from the stator case pos.888, it is necessary to disassemble (remove) the body of the handle of the grinder pos.24.

This operation must be performed to get coal brushes poses.810 holding a rotor collector.

At the second stage, unscrew 4 (four) screws poses.61, fixing the gearbox and stator housing.

Having pulled out the rotor together with the gearbox, proceed to disassemble the gearbox.

Repair of Bosch Bosh begins with the disassembly of the gearbox pos.821. Dismantling the gearbox begins with twisting 4 (four) screws poses.60. As a rule, at the factory, screws are screwed on sealant. Will have to make certain efforts.

We note right away! Low power Bosch Busters in the gearbox uses straight.Toothed gears. In a capacity of more than 1000 watts in gearboxes, braids are used in the gearboxes.

How to remove the driven gear

Having removed the gearbox cover, you can get the knot of the lobby of the gear pos.26.

To remove the gear, you need to use the press or the puller. But the use of the puller is difficult, since it requires the use of special thin sponges.

Before you remove a shutter, check the backlash of the toothed connection, the integrity of the teeth, the contact spot.

On the shaft of the spindle pos.26 Put the bearing of poses.Fifty. If the bearing has a large backlash, it is noisy when scrolling, the lubricant has dried up, it is preferable to replace it.

To remove the bearing, it is necessary to remove the gear, the stop ring and dismantle the bearing. If when dismantling the rotor shaft node the bearing remains in the gearbox body, the bearing is dismantled with a hammer and a soft instruction.

How to remove the lead gear Bosch grinder

Leading gear pos.27 is removed from the rotor shaft in the following sequence:

The main malfunctions and repair of the grinder with your own hands

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 grinder with your own hands. Repair of the grinder must be carried out carefully and carefully to prevent negative consequences and the appearance of more complex breakdowns.

Ushm electrical equipment device

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

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

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

The site polished by brushes can be seen when disassembling the case. Through the power cable, the current enters the brushes, which transmit the voltage to the collector. Most often, brushes make themselves felt with a glow, and depending on the glow, the degree of efficiency of brushes or anchor can be determined. No less important detail is the gearbox. The main task of the gearbox is to transmit movement from anchor to a working shaft on which a disk or other device is installed. The power of the power tool depends on the design of the gearbox, since this parameter is determined by the number of teeth of the main gear of the gearbox.

The stator is considered a very complex technical node. In the stature there is a winding that determines rotation of the rotor. When the winding fails, its rewinding is rarely carried out and may less often be crowned with success. With such malfunctions, you should not risk it. To eliminate problems, you need to contact experienced specialists.

Electric circuit

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

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

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

Malfunction of the electocepe of the collector motor

Most often, breakdowns in the electrical circuit of the grinder occur for the following reasons:

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

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

Small breakdowns and their elimination

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

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

You should check the button and eliminate it if the malfunction is detected or replace the button. The button must be carefully disassembled, while it is desirable to mark the terminals and wires. When connected, it is important to correctly connect the contacts, since the wrong installation can cause blocking the winding and jamming of the anchor.

How to disassemble a Bosch grinder

At the end of the summer season, the tool migrated from the cottage to the apartment, so it’s time to perform service. This time we will serve a simple criminal machine, which is the Bosch PWS 750-115 Bulgarian. The tool was purchased in 2009, but it was not used very often, I worked a little on the repair of the apartment, and then was episodically used in the country.

I did not really work out at the beginning, due to the fear of the instrument. A colleague at work was injured due to non-compliance with the simplest safety precautions (Bulgarian District on wood “Without a casing” on weight), in general, a classic case. But after years, I still had to overcome my fears and start using the tool. I would like to warn, the Bulgarian, like any other power tool, does not forgive frivolous and careless circulation. Simple safety regulations will protect your health!

The Bulgarian was bought in a plastic suitcase, included: the tool, the key, an additional pen and, according to tradition, a bunch of waste paper, which is better to read, at least the section “Safety of work”. Several times I already disassembled the tool, but due to small use, the disassembly ended with opening the gearbox and lubrication defect in it. I will make a reservation once again that it is better to disassemble only a tool with a guarantee that has ended or does not have one.

Let’s start disassembly with the inspection of the gearbox. First we remove the protective casing and clean it from dirt. Turn away the four screws of attaching the gearbox, traditionally use a bat “star” (Torx T20). Carefully dismantle the gearbox from the case, you may have to put the gearbox cover from each side using a slotted screwdriver.

When dismantling, special attention should be paid to two metal gaskets, which must be tried not to damage. As I actually expected, in view of the low operation of the grinding grinding in the gearbox, to be in good condition and does not require replacement.

Since the low.Power tool is straight.Toothed gears in it, the tool with high power usually uses scooters. If the lubricant is in unsatisfactory condition, it must be replaced, for this it is necessary to completely get rid of the old. All the old grease must be removed due to the fact that it may contain particles of metal and fill a new. If, how do I have lubricants in good condition, then it should be distributed along large and small gears, with the final assembly of the tool.

Next, we disconnect the gearbox body from the plastic case, for this it is necessary to unscrew four screws and carefully disconnect the parts. There is a lot of dust in the air intake, so control that the dust with dirt does not get into the tool. Also try not to damage the rubber seal in the form of a ring.

Next, go to the disassembly of the plastic case and postpone the condition of the main electric nodes. By unscrewing all the screws on the case, you can disconnect the body into two parts. In one half the motor will remain, the second part will be completely empty. We remove all the dust from the tool with a soft brush or as proposed last time with air (vacuum cleaner, compressor, compressed air in a spray can). For better access, you can pull out the engine, or you can dismantle the tool on the tool and clean it without disassembling.

Very often, the main malfunction of the tool is a torn power cable, so if there are strong places of bends, it is better to cut it and reconnect it or completely replace it with a new.

To check or replace the brushes, it is necessary to dismantle the spring and carefully bend the fixers. Having examined the brushes, you can proceed to the assembly of the tool.

The assembly is carried out in the reverse order and does not cause difficulties. When closing the panels and screwing the gearbox, pay attention to the gaps and the absence of “nested” wires. After the assembly, be sure to turn the shaft and make sure that all the details are spinning smoothly, nothing will be bifurcated and does not crack. It is better to check once than to look for new gears or a new tool later. As a result, you can serve the tool on your own and without much trouble.

Without fear of disassembly and assembly of the gazelle gearbox.

The main thing is shown in the abbreviated form. Write if you need in detail to you.

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

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

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

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

Bosch Bold Scheme will help to carry out repairs on your own.

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

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

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

How to make a bosha grinder

Angle.Grinding machines in the old days were made in Bulgaria. Therefore, the Ushm and became called a grinder. Now there are many USHM production companies of different models. Alas, the main elements are similar. Having familiarized yourself with the device, possible breakdowns and the diagnosis of the tool, you can repair the grinder at least any modification on your own.

Bulgarian created for grinding and cutting different materials.

Bulgarian consists of subsequent parts:

• The thin case of a duralumin alloy gearbox better removes heat.
• Coal brushes.
• Fastening the handle.
• Electric system of smooth launch. Prevents a jerk when turning on and reduces the starting loads on the engine.
• Quick protective casing.
• Ball bearings.
• Electric motor.
• Bulgarian switch.

A large selection of bearing products is offered by the company “Thermopolis”. Https: // termopolis.Com.UA/

• Burning, sparkling and jerks. Prerequisites: violation of the insulation of the anchor winding, wear of brushes, collector, clogging of brush holders. Even after changing the brushes Bulgarian sparkles and twitches if the brush holders are clogged.
• Clapping sound. Brushes or inter.Flood.Closing at least any of the windings.
• Crushing sound. The reason is the bearings.
• Mechanical roar and strong tapping. Reducer malfunction.
• Bulgarian finished working, does not cut it. If the disk is performed manually or does not revolve, the reason is in the gearbox. If it turns simply, check the electronic circuits. If the chains work, check the engine and brushes.
• The spindle fixation button broke. The reason in pressing it at the time of rotation of the disk as it is also called in the jamming of the disk.
• Ushm works in snatches. Check the engine for the interval circuit.
• Vibrates. The reason is the mechanics. Check bearings, rotor shaft and gearbox.
• Heating. If heated in the engine, then the reason in the worn brushes as it is also called a small circuit of the turns of the windings. If the gearbox body heats up, then the lubricant has dried up or the gears are worn out.
• Power does not develop or the power falls. Reason for electronics or engine. Check the control board of the smooth start and the revolutionary control regulator, brushes and collector.
• Smoke. The reason for overheating of the tool. Check the motor windings for insulation melting.
• Buzzes and does not even spin. Check the motor bearings and gearbox.

To search for defects, the grinder is necessary disassemble.

Unscrew the bolts of fastening the protective casing.

Unscrew the bolts of the grinder body all with which the case is attached to the gearbox.

Remove the highest part of the rear building. Unscrew the cord bolts. Remove the wires and button from your own grooves. In certain models, for example, in DWT, the rear case does not understand parts, but is completely removed.

Unscrew the gearbox bolts located around the fastening of the casing.

To disconnect the anchor from the duralumin case, unscrew the nut located in the gearbox body.

Collect a tool in a reverse sequence.

At one time, the disk can be so tightly tightened with a nut that it begins to crumble. Unscrew the nut with a key is unrealistic. And this is not necessary, because there is an option to break a grinder. At first, break the disk to the nut itself. Later, find the iron plate slightly thinner than the working disk. With its help, get the rest of the disk under the nut. She just unscrews the key or hands. So as not to bring the tool to this task, put the puck under the nut.

In some Bulgarians, for example, Bosh, the casing is not screwed with bolts, but is fixed. To remove it, it is necessary to turn the neckline of the casing perpendicularly grinder. To put on, turn to click.

• Interpretation close. Put the resistance mode 200 Ohms. Connect the probes of the device with the ends of one winding. A unit means a cliff, and zero is a kutsey close between the turns. If it indicates the presence of a resistance of more than 1.5 Ohms, then inspect the second winding. Both windings are approximately monotonous resistance.
• A breakdown on the mass or the locking of the winding with the iron body of the stator. In the multimeter, put the most resistance mode. Connect one probe with the end of the winding, the other probe with the iron body of the stator. The unit says there is no breakdown.

How to fix the Bosch grinder fell power greatly sparking the repair of the GWS 850 CE tool

At first, visually inspect the collector and winding. There will be visible damage: black traces, bent rounds of windings, raised, worn out in other words of the steamed plates of the collector. After inspection, proceed to check the tester.

• Place the resistance of 200 Ohms. Connect the probes of the device with 2 adjacent collector plates. If the resistance is monotonous between all adjacent plates, the winding is good. If the resistance is the least 1 ohms and very close to the absence, Coice is found between the turns. If the resistance is higher than average and more than once, it means that there is a break in the turns of the winding.

Definition of breakdown for mass is done if the passage of the absence of a break in the winding. Put the greatest resistance on the device scale. Depending on the tester, you will like it more from 2.7 MOM to 200 MOM. Connect one probe with the shaft, and the other with each plate in turn. In the absence of defects, the resistance must be made zero. Do the same with the rotor. Connect one probe with the steel rotor housing and move the other on the plates.

How to disassemble a grinder

Before the instrument is finally broken, you can observe:

• Strong vibration;
• Turning on an engine with low buzzing;
• Sparkling of collector brushes;
• Smoke and smell from the body;
• Crackle inside the gearbox;
• Substantial vibration of the case during work;
• Braining the bearings.

Before analyzing the Ushm, you need to study the rules that should be followed. First thing turn off the tool from the network. Work on a well.Lit table. Do not violate the disassembly order so that it is clear how to collect later.

Ushm can be disassembled yourself, the main thing is to remember the assembly procedure

Preventive actions

To avoid breakdowns and expensive repairs, you need to monitor the condition of the grinder. The gearbox should have enough lubrication. In this case, you need to use Special materials, not the cheapest. Do not overload the tool with work for which it is not designed, and also include for a long time.

It is important to observe the modes. Dust entry also harms the instrument. Subject to all these rules and neat circulation, the Bulgarian will last a long time and will not cause problems.

As a rule, to identify most of the malfunctions of the grinder is easy. Minor breakdown is eliminated independently, large requires the hands of the master to replace the element and some investments. Important Determine the cost and expediency of this procedure in advance. This will help make a decision to repair the tool or buy a new Ushm.

Repair of a small bosha boshe with your own hands

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

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

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

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

Bosch Bold Scheme will help to carry out repairs on your own.

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

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

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

How to make out a grinder | News in construction

The process of disassembling the grinder is not difficult and does not require special knowledge, but it requires attentiveness and caution. Dismantling of any tool can be justified not only from the point of view of repairing components of parts, but also from the point of view of regular cleaning of dust and dirt. Therefore, how to disassemble the grinder, you need to know if you are the owner of such a tool and are interested in ensuring that your tool is working properly for a long period.

Today you can buy various grinders that differ not only in appearance and size, but also in quality. Despite the abundance of models of different manufacturers, characterized by different quality of the assembly, all of them usually have the same assembly principle (layout of parts).

Read more on the site http: // Stroivagon.Ru Choosing a grinder

Therefore, today we will try to find out in this article how to disassemble the grinder of one manufacturer and look inside the case to familiarize yourself with the device of the grinder. Having dealt with this and having understood the device of this grinder, then you can easily make out and back to collect any model you have.

In principle, a lot of tools are not needed for disassembling a grinder, it is enough to have a screwdriver with a ratchet or ordinary and be a little assembled and attentive. Dismantling must be done carefully, slowly and at the same time try to remember the location of the parts inside the case for the correct reverse assembly.

Picture 1. The appearance and location in the body of the system of the system SJS

The main modules components of the assembly of the Bulgarians of all types

One. Convenient housing made of shockproof plastic.

A powerful powerful electric motor which consists of a rotor and stator.

A reliable gearbox that allows you to turn the rotation axis of the rotor spindle 90 degrees.

Smooth start button (not all models are equipped).

System SJS ( Super-Joint-System).

The system provides convenient and smooth operation during operation. It also avoids the operator’s injury and the tool breakdown when jaming the cutting circle into solid material, reduces the level of vibration to a minimum. True, not all grinder are equipped with manufacturers of such a device.

Protective casing allows the operator to work in safety.

Eight. Additional handle. This device allows you to more conveniently hold the tool during operation. The ability to fix the handle in several positions turns the tool into a more convenient and universal device.

And so, today I propose to consider the disassembly of a grinder with a capacity of 700 watts, which I use only for grinding metal surfaces. During grinding, the Bulgarian is strongly contaminated with small metal parts, dust and dirt accumulating inside the body of the grinder in the form of thick layers and pose a greater threat to the performance of the tool.

Therefore, I periodically analyze the grinder after the work and spend the inspection of parts as well as regular cleaning of metal dust and dirt. This process is quite monotonous, but very necessary since the performance of the tool is extremely important for me. Further, I propose to move from words to business and get acquainted with the process of disassembly.

Read more on the site http: // Stroivagon.Ru Bulgarian device

How to disassemble gearbox grinds

The process of disassembling the grinder is inextricably linked with the disassembly of the grinder gearbox, since they make up one. The grinder can be disassembled without the need to disassemble the gearbox, but in this case, such a disassembly would not be complete. Therefore, then we will consider the process of disassembling the grinder and gearbox as components of one whole.

To conduct this operation, we need a screwdriver. Personally, I use a universal-many-functioning screwdriver with a ratchet mechanism.

Dismantling using a screwdriver of a protective casing of a grinder

To disassemble the protective casing of the grinder, it is necessary to unscrew the mounting bolts. For this model, fastening bolts in the amount of 4 pcs. You can unscrew the screwdriver. For other models, you may need a wrench.

Read more on the site http: // Stroivagon.Ru Which grinder to choose

Step-3. Reducer extract from the grinder body.

The gearbox in the housing of the grinder (for this model) is held using four bolts. Scroll these bolts with a screwdriver, then gently remove the grinder gearbox from the housing.

The rotor is fixed rigidly with the grinder gearbox

For this model, the reducer and rotor of the electric motor are fixed by the hard. To extract the rotor from the gearbox, you must first disassemble the gearbox. Therefore, our next step will be the disassembly of the gearbox itself.

Dismantling using a screwdriver of a grinder gearbox

Ground gearbox is disassembled not only for the repair of failed parts, but also for preventive work.

The grinder gearbox is the most important node and during operation experiences certain loads.

Vedica gear (gear of an anchor shaft).

Bearing that need lubrication to reduce friction forces arising in the process.

Step-5. Appearance of a disassembled gearbox

Rearing sliding bearings

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

• Use in maximum mode;
• Too fast rotation;
• Insufficient volume of lubricant fluid;
• Getting particles of dirt and dust;
• Untimely/incorrect replacement of coal brushes or their deformation.

Правильный ремонт погружного блендера (Zelmer ZHB1230BUA 491.30)

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

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

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

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

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

Repair, preparation for work, necessary tools

Before performing repair work Diagnosis is performed In order to determine parts and nodes, due to which the Bulgarian cannot function normally. Electric part of the Ushm It is inspected visually on the subject of the traces of the surface burning in places of short circuit. In the absence of obvious signs of malfunctions after examination, the electric part checked by nickname using special devices (multimeter, short circuit indicator and others). After finding and analyzing the damage, the method of eliminating it is accepted.

Exist Two main methods of stator repair with your own hands:

• A burned stator is extracted from the grinder body. In a specialized store, an identical to a failed device is acquired and is used in Ushm instead.
• The burned winding is removed from the core body and a new one, corresponding to the old turns of the turns and the diameter of the wire, is wound.

Call and rewinding

If the burned stator became the cause of the breakdown of the grinder, it turns out in more detail what part of it is involved in this. In the presence of defects in the coil windings, some users independently rewind new. A detailed description of the production of such works on the links “How to call the stator grinder” and “rewinding the stator of the grinder with your own hands”.

Replacement

For the DWT model, the next video was A new stator was acquired in return for the burned out. The new stator was positioned as a knot precisely from the grinder of this model. Details The process of disassembling Ushm is described before extracting a faulty stator from the case. When examining the appearance of the new and old stators bought There was some difference. However, after the assembly and verification of performance, it turned out that they practically did not affect the work of the grinder.

Burned, rewinding

The author of the next video from the neighboring state of the state, experiencing difficulties with buying a new stator instead of the Bulgarian of the Russian.Made power of the Interskol model, made a decision Rewind it yourself. It is important to pay attention to the experience that the author received in the process of rewinding the wire. You can not weaken its stretch, otherwise the coil will not be able to fit in the depression of the stator. The second time the winding was successful.

The impregnation with varnish described during the repair should not be copied one to one. Because Ordinary carpentry varnish does not have the necessary electrical insulation properties. With difficulties with a choice of prophet substance It is better to use material based on epoxy resin, which is easy to find. The quality of the impregnation will improve if the stator is heated, and not wait until the varnish stops penetrating the winding.

Bosch, replacement

The next video is the author repairs the Bosch model grinder. Work in a very dusty atmosphere, of course, can cause a strong wear of the collector lamella, but for the unambiguous reason for the failure of the stator windings, it should not be taken in any way. Here you should also consider other operating conditions (overload, duration of work and others).

Diagnostics by the author is in the nature of fortune telling on coffee grounds. A sharp change from a burned rotor, which was still quite efficient, to a charred isolation at a stature that really failed, says The absence of a systematic approach in repair work.

During disassembling the grinder The stator is released from the corps Under the influence of strong hammer blows. Although it is wooden, it can cause damage to the protruding parts of the body.

Why not immediately make the output ends of the stator of normal length, remains a mystery. The author twice does the same, very laborious work without explaining the reasons.

Possible electrical malfunctions

The malfunctions of the electric part of the Bosch grinder can conditionally be divided into simple and complex.

Simple malfunctions of the electric part of the Bosch grinder

If you turned on the grinder, and she refuses to work, start looking for a malfunction from a break of the power supply wire. Most often, the wire break is manifested at the entrance site to the grinder or into the fork. Do not allow twist, this will lead to a short circuit in the tool.

To determine such a malfunction, it is necessary to open the lids of the handle of the grinder. In Bosch grinder up to 1000 watts, the lid is attached with one screw in the end. Bosch Bosch over 1000 watts of the handle cover is attached with several screws.

Using a tester, call the power circuit from the entrance fork pos.5 before the switch. With a whole circuit, go to check the circuit breaker. Bosch grinders use simple circuit breakers controlled by the switching lever.

But the electrical contacts of the switch are burned and become the reason for the failure of the grinder. It is impractical to restore contacts of a plastic switch, you need to change it to a new.

If the switch is intact, using the tester, check the presence of the chain from each pin of the fork to each charcoal brush.With entire circuits of the grinder, the. If it does not rotate, then the malfunction by the mechanical part. It is possible to jam the gears or destruction of bearings.

Checking the electric motor

If your Bosh Bosh Bosh is gaining momentum, regardless of you, begins to warm up, sparkle, you need to pay attention to the integrity of the rotor windings, stator.

An involuntary set of speed of Ushm indicates a malfunction of the stator windings. The integrity of the windings is checked by the tester, and a short circuit between the turns is checked by a special device.

How to determine the rotor malfunction

Rotor repair is a complex technological process available to masters with straight hands.

The rotor malfunction is indicated by the drop in engine speed, the appearance of a long sparkling trace in one of the brushes. This is the first sign of a short circuit of the turns of the anchor winding.

The rotor repair is preferably carried out in special workshops. And you can rewind yourself if you decide to repair Bosch grinder yourself.

The dark color of the rotor winding and the burnt lamelons of the collector indicate a short circuit in the rotor chains. The malfunction is eliminated only by replacement with a new rotor.

Stator repair

Repair of the Bosch angle grinding machine includes the restoration of the stator. The main sign of the failure of the stator is a spontaneous increase in the revolutions of a working grinder, which cannot be reduced by adjustments.The burnt stator winding changes color, it becomes darker. The core of the stator from high temperature also darkens.

The stator is easier to rewind, although here you need to follow certain rules and sequence.

If you removed the cover of the stator case, carefully inspect the condition of the coal brushes and the lamella of the rotor collector.

The length of coal brushes should not be less than 8 mm. By the way, coal brushes with a “shot” are used in Bosch grinder, a device that stops the operation of a grinder with a minimum length of a coal brush.

The collector lamps should not have traces of carbon or wear. The carbon car is easily removed using a cotton swab moistened in alcohol.

Malfunctions of speed controllers

In the Bosch series, especially low power, the rotation frequency regulators are installed. Access to the regulator of the rotation frequency is carried out by opening the stator body handle holding on one end screw.

The range of rotation of the regulator can be set by a potentiometer hidden in the handle panel.

The faulty regulator is removed quite easily, since it is attached only on the guide.

Repair of the Ushm revolutionary control regulator is a complex process, the implementation of which requires not only special knowledge, but tools and equipment.

If the revolution regulator fails, but there is no new one, then disconnect the supply wires and install the jumper.

Red shows a jumper installed when the revolutions are exiting the system.

How to make a bosha grinder

Angle.Grinding machines in the old days were made in Bulgaria. Therefore, the Ushm and became called a grinder. Now there are many USHM production companies of different models. Alas, the main elements are similar. Having familiarized yourself with the device, possible breakdowns and the diagnosis of the tool, you can repair the grinder at least any modification on your own.

Bulgarian created for grinding and cutting different materials.

Bulgarian consists of subsequent parts:

• The thin case of a duralumin alloy gearbox better removes heat.
• Coal brushes.
• Fastening the handle.
• Electric system of smooth launch. Prevents a jerk when turning on and reduces the starting loads on the engine.
• Quick protective casing.
• Ball bearings.
• Electric motor.
• Bulgarian switch.

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• Burning, sparkling and jerks. Prerequisites: violation of the insulation of the anchor winding, wear of brushes, collector, clogging of brush holders. Even after changing the brushes Bulgariansparkles and twitches if the brush holders are clogged.
• Clapping sound. Brushes or inter.Flood.Closing at least any of the windings.
• Crushing sound. The reason is the bearings.
• Mechanical roar and strong tapping. Reducer malfunction.
• Bulgarianfinished working, does not cut it. If the disk is performed manually or does not revolve, the reason is in the gearbox. If it turns simply, check the electronic circuits. If the chains work, check the engine and brushes.
• The spindle fixation button broke. The reason in pressing it at the time of rotation of the disk as it is also called in the jamming of the disk.
• Ushm works in snatches. Check the engine for the interval circuit.
• Vibrates. The reason is the mechanics. Check bearings, rotor shaft and gearbox.
• Heating. If heated in the engine, then the reason in the worn brushes as it is also called a small circuit of the turns of the windings. If the gearbox body heats up, then the lubricant has dried up or the gears are worn out.
• Power does not develop or the power falls. Reason for electronics or engine. Check the control board of the smooth start and the revolutionary control regulator, brushes and collector.
• Smoke. The reason for overheating of the tool. Check the motor windings for insulation melting.
• Buzzes and does not even spin. Check the motor bearings and gearbox.

To search for defects, the grinder is necessary disassemble.

Unscrew the bolts of fastening the protective casing.

Unscrew the bolts of the grinder body all with which the case is attached to the gearbox.

Remove the highest part of the rear building. Unscrew the cord bolts. Remove the wires and button from your own grooves. In certain models, for example, in DWT, the rear case does not understand parts, but is completely removed.

• Disconnect the wires of the motor.
• Remove the brushes.
• Disconnect the gearbox body from the grinder body. Together with the child, an anchor of the motor is extracted.

Unscrew the gearbox bolts located around the fastening of the casing.

To disconnect the anchor from the duralumin case, unscrew the nut located in the gearbox body.

Collect a tool in a reverse sequence.

At one time, the disk can be so tightly tightened with a nut that it begins to crumble. Unscrew the nut with a key is unrealistic. And this is not necessary, because there is an option to break a grinder. At first, break the disk to the nut itself. Later, find the iron plate slightly thinner than the working disk. With its help, get the rest of the disk under the nut. She just unscrews the key or hands. So as not to bring the tool to this task, put the puck under the nut.

In some Bulgarians, for example, Bosh, the casing is not screwed with bolts, but is fixed. To remove it, it is necessary to turn the neckline of the casing perpendicularly grinder. To put on, turn to click.

• Interpretation close. Put the resistance mode 200 Ohms. Connect the probes of the device with the ends of one winding. A unit means a cliff, and zero is a kutsey close between the turns. If it indicates the presence of a resistance of more than 1.5 Ohms, then inspect the second winding. Both windings are approximately monotonous resistance.
• A breakdown on the mass or the locking of the winding with the iron body of the stator. In the multimeter, put the most resistance mode. Connect one probe with the end of the winding, the other probe with the iron body of the stator. The unit says there is no breakdown.

Read how to cut tiles with a grinder correctly

How to fix the Bosch Bosh \ Falled Power \ Speaking Very Speaking \ Tool Repair \ Gws 850 CE

At first, visually inspect the collector and winding. There will be visible damage: black traces, bent rounds of windings, raised, worn out in other words of the steamed plates of the collector. After inspection, proceed to check the tester.

• Place the resistance of 200 Ohms. Connect the probes of the device with 2 adjacent collector plates. If the resistance is monotonous between all adjacent plates, the winding is good. If the resistance is the least 1 ohms and very close to the absence, Coice is found between the turns. If the resistance is higher than average and more than times, it means that there is a break in the turns of the winding.

Definition of breakdown for mass is done if the passage of the absence of a break in the winding. Put the greatest resistance on the device scale. Depending on the tester, you will like it more from 2.7 MOM to 200 MOM. Connect one probe with the shaft, and the other with each plate in turn. In the absence of defects, the resistance must be made zero. Do the same with the rotor. Connect one probe with the steel rotor housing and move the other on the plates.

Shine one probe in the button output, and the other in the reverse input.

Press the button. The sound signal says the serviceability of this part of the button.

Do the same acts with another entrance and the release of the button.

Connect one probe with the contact of the fork, the other with the entrances to the button. In one of the 2 provisions, the sound signal must be. Similarly, do a plug with another contact.

Disassembled Bosch Bosh with your own hands

For the owner of the power tool, knowledge of its device and the ability to disassemble is a mandatory task.

Knowing the procedure for disassembling the grinder allows you to independently perform work such as replacing lubrication, changing bearings and coal brushes.

To disconnect the gearbox of the poses.821 from the stator case pos.888, it is necessary to disassemble (remove) the body of the handle of the grinder pos.24.

This operation must be performed to get coal brushes poses.810 holding a rotor collector.

At the second stage, unscrew 4 (four) screws poses.61, fixing the gearbox and stator housing.

Having pulled out the rotor together with the gearbox, proceed to disassemble the gearbox.

Repair of Bosch Bosh begins with the disassembly of the gearbox pos.821. Dismantling the gearbox begins with twisting 4 (four) screws poses.60. As a rule, at the factory, screws are screwed on sealant. Will have to make certain efforts.

We note right away! Low power Bosch Busters in the gearbox uses straight.Toothed gears. In a capacity of more than 1000 watts in gearboxes, braids are used in the gearboxes.

How to remove the driven gear

Having removed the gearbox cover, you can get the knot of the lobby of the gear pos.26.

To remove the gear, you need to use the press or the puller. But the use of the puller is difficult, since it requires the use of special thin sponges.

Before you remove a shutter, check the backlash of the toothed connection, the integrity of the teeth, the contact spot.

On the shaft of the spindle pos.26 Put the bearing of poses.Fifty. If the bearing has a large backlash, it is noisy when scrolling, the lubricant has dried up, it is preferable to replace it.

To remove the bearing, it is necessary to remove the gear, the stop ring and dismantle the bearing. If when dismantling the rotor shaft node the bearing remains in the gearbox body, the bearing is dismantled with a hammer and a soft instruction.

How to remove the lead gear Bosch grinder

Leading gear pos.27 is removed from the rotor shaft in the following sequence:

• Pull the rotor with your hand and use a rock key with a clock counterclockwise the nut.45.;
• Remove the puck pos.59.;
• Pull the leading scobie gear pos.27.

Check visually the integrity of the gear teeth, contact spot.

If the gears are strongly worn out (licked), there are chips of teeth, then they are subject to replacement. Over, the replacement of the gears is always paired.

In small.Power Bosch grinder, a needle bearing is used as a support bearing in the gearbox in the gearbox.

Do.It.Yourself Ushm Repair with your own hands perform strictly attached instructions. If you need to extract a needle bearing from the body, you can’t do without quick wits. Its dismantling is performed only during destruction.

To get the destroyed clutch clip, you can use the proven way.

A tap is selected with a diameter, a slightly large inner diameter of the clip of the destroyed needle bearing. The tap is fixed in the cartridge of the screwdriver and screwed carefully at low speeds into the clip. When the tap reaches the bottom of the gearbox case, it will begin to raise the clip.

In addition to the needle bearing of the spindle shaft, two more bearings installed on the Rotor shaft are used in Bosch grinders.

How to remove bearings from the rotor of the Bosch grinder

To dismantle bearings from the rotor pos.803 Bosch Bolds are recommended to use pullers.

Bearing pos.15 near the collector is easily removed, but to remove the bearing pos.14 on the side of the impeller is complicated by the fact that a number of preparatory operations must be performed.

Bearing pos.15 closed with a soft rubber nest. Similar rubber protection poses.33 closes and bearing poses.Fourteen.

To dismantle the bearing pos.14 must unscrew the nut pos.45, remove the direct gear poses.17 and plastic protection poses.33. Using the puller, you can easily dismantle the bearing from the rotor shaft.

And if there is no puller? A vice, two metal stripes and a hammer with a mentor made of soft metal will come to the revenue.

Video: Bosch Gws 850 CE (Bulgarian 125) What kind of grinder to choose a small grinder with speed regulation

Prevention of Bulgarian breakdowns and tools

To avoid damage to the device, it must be completely or partially disassembled, lubricated and if necessary, replace some elements.

The efficiency of independent repair of the grinder depends on the type of breakdown. For the procedure to be successful, it is important to conduct detailed diagnostics.

Master of Architecture, graduated from the Samara State Architectural and Construction University. 11 years of experience in the field of design and construction.