What brushes to put on the ushm. Cupshaped, in the shape of a cup

Speaking of brushes on the grinder causes and features of their replacement

It is difficult to imagine an arsenal of a home master without such a popular power tool as Ushm or Bulgarian Corner Ground. Ushm gained its popularity due to universality, since this tool can be used for cutting, grinding, sawing, polishing, stripping, gear and other works. And you can process absolutely any materials. During the operation of the tool, different breakdowns arise, and one of the most common is the sparking of brushes on the Ushm. Why do not many know the brushes on the grinder, so we will understand this issue, and also find out why they burn and how their replacement is performed.

Before you find out the reasons for the sparking of brushes on the grinder, you need to deal with their purpose. Collector brushes are used not only in the design of angle grinding machines, but also in the device of all modern power tools. Drills, perforators, electrolobsics and others. In the design of the grinder and other power tools, 2 brushes are used, which have a simple design. This design is based on the following elements:

• The main part. Has a rectangular shape, and is made of coal or graphite
• Contact is the wires of the corresponding diameter through which the electric current occurs. Contact connects the wire to the graphite part
• Spring. A mechanism that provides the clamp of the main part to the collector. There may not be a spring element, and this suggests that such a brush is intended for installation in a power tool where the brush holders have a built.In clamping mechanism in the form of a curved plate

Devices are designed to transfer the electric current to the rotor of the power tool. The removed voltage from the stator is supplied to the rotor, which is reproduced using coal brushes and collector. The current supply to the collector provides its rotation. When rotating the rotor of the device, the device is in contact with the collector (copper lamellas. Conclusions of the anchor winding), thereby ensuring the continuous flow of electric current.

In the process of applying devices, they are abrasion, therefore, they belong to the category of consumables. The service life of brushes depends not only on the working resource of the power tool, but also on the materials from which they are made. The wear of the brushes affects not only the mechanical effect due to the friction force, but also the thermal. Electric current when passing through the conductor causes its heating. The greater the current strength, the higher the heating temperature. When passing current through graphite brushes, they also heat up. The higher the load on the power tool, the higher the current, which means the temperature increases, which negatively affects the integrity of consumables.

It is interesting! There are no differences between the brushes for the corresponding power tools (with the exception of the fixing method), since they are selected exclusively according to such a parameter as the dimensions of the main part.

Replacing brushes on a grinder

Corner grinding machine (or as it is also called “Bulgarian”). Indispensable and demanded in the work of the master tool. Like any other it is subject to natural wear. During operation of the tool Different breakdowns arise, and one of the most common is the sparking of brushes on the ushm. In the article master plumber He will tell you why brushes sparkle on a grinder, and also why they burn and how to replace them.

Before you find out the reasons for the sparking of brushes on the grinder, you need to deal with their purpose. Collector brushes are used not only in the design of angle grinders, but also in the device of all modern power tools. Drills, Perforators, Electrics and others.

In the design of the grinder and other power tools, 2 brushes are used, which have a simple design.

This design is based on the following elements:

• The main part. Has a rectangular shape, and is made of coal or graphite;
• Contact is the wires of the corresponding diameter through which the electric current occurs. Contact connects the wire to the graphite part;
• Spring. A mechanism that provides the clamp of the main part to the collector. There may not be a spring element, and this suggests that such a brush is intended for installation in a power tool where the brush holders have a built.In clamping mechanism in the form of a curved plate.

Devices are designed to transmit an electric current to Rotor Bulgarians.

The removed voltage from the stator is supplied to the rotor, which is reproduced using coal brushes and collector. The current supply to the collector provides its rotation.

When rotating the rotor of the device, the device is in contact with the collector (copper lamellas. Conclusions of the anchor winding), thereby ensuring the continuous flow of electric current.

In the process of applying devices, they are abrasion, therefore, they belong to the category of consumables. The service life of brushes depends not only on the working resource of the power tool, but also on the materials from which they are made. The wear of the brushes affects not only the mechanical effect due to the friction force, but also the thermal. Electric current when passing through the conductor causes its heating. The greater the current strength, the higher the heating temperature. When passing current through graphite brushes, they also heat up. The higher the load on the power tool, the higher the current, which means the temperature increases, which negatively affects the integrity of consumables.

Brushes for a grinder and other power tools are made from different materials, but the main ones are coal and graphite. It is this material that has a low coefficient of friction, and also has increased strength to abrasion. To improve contact, different impurities are added to the composition of graphite or coal during the manufacture of brushes. Depending on the impurities used, the following types of brushes are distinguished:

The composition of the main part affects not only the service life or wear, but also on such a parameter as signs of sparking. The size of the sparkle of brushes depends on the composition from which they are made. When buying them, you need to pay attention to the composition, and do not acquire the equipment of unknown origin and dubious quality.

Appointment

With the help of wire brushes installed on a grinder, many types of surfaces are processed. It can be Processions made of metal, wood, plastic, concrete, stone and other types of materials. The main operations performed using brushes are as follows:

• Surface cleansing from old paintwork;
• Traces of corrosion, the remnants of the scale, the colors of the runner are removed;
• Welding seams are aligned from excessively fused metal;
• Processing of wood from villi to improve the coating with an antiseptic that increases the durability of the material;
• As a technological tool for brushing wood (artificial aging, as an element of a design solution);
• The rough phase of surface processing before the next technological operations;
• Finishing processing. For grinding and polishing surfaces;
• Removing burrs and sharp edges from corners.

When performing many technological operations of the cord-maker used instead of abrasive circles.

For clarity, you can see a comparison of different nozzles for Ushm in the process of removing paint and rust.

Bulgarians with the rear handle

Bulgarians with the rear handle allow you to get to the brushes in a slightly different, simpler way:

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

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

Signs of a malfunction of the mechanism

In the process of using a grinder, it is impossible to avoid small garbage from the mechanism. This leads to the fact that in the area of ​​copper plates there is a closing and overheating. An increase in temperature leads to the fact that the brushes begin to melt and burn. And as soon as the dimensions are close to the minimum, indicated by the manufacturer, the master can observe the following alarming signs:

• Metal brushes on the grinder begin to sparkle;
• When working, the tool has jerks or twitching;
• With severe wear of brushes, the smell of Gary may appear.

Some manufacturers of Bulgarians use special types of protective brushes. They are equipped with a special device that controls their length. As soon as the parameters of the parts do not meet the requirements, it blocks the operation of the mechanism up to the elimination of the malfunction. This measure helps to protect the entire tool from failure.

Coal, graphite and metallographic brushes for Ushm

In the manufacture of electric machines brushes The following materials are used:

Electograph, obtained from carbon materials (soot, anthracite, oilcox, coke), compressed after heating in electric furnaces at a temperature above 2500 ° C.

During heat treatment, the components turn into artificial graphite, which has good switching properties and a high level of protection against close and carbonization.

Areas of use: DC motors of various power; AC motors; traction electric motors; universal electric motors; generators; rotating converters and t.D.

Graphite Makita brushes are suitable for Ushm 9565C/9565CV/9565CVL. Photos all tools.RU

Carleographite, seduced and compressed mixture of amorphous carbon, graphite and binding substances. It has low abrasiveness, removes slight carbonning at low sliding speed, has weak sparking.

Areas of use: turbogenerators; electric motors up to 30 kW; microdisters; universal engines; dynamo machines; Car generators.

Hard coal, amorphous carbon. Has a solid structure, high hardness and abrasiveness, cleanses the surface of the collector. In conditions of rigid switching and significant peripheral velocity, hard coal brush with high specific resistance and graphite structure are used.

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Areas of use: universal engines; Electricians up to 30 kW and voltage up to 500 V. Brush for household appliances.

Bakelite.Graphite. It is made by mixing graphite powder with bakelite resin, pressed and polymerized at high temperature.

Characterized by a large specific resistance with a voltage drop, a large difference between transverse and longitudinal electrical resistances, which positively affects the mitigation of the conditions of switching.

Areas of use: electric generators up to 30 kW, collector electric motors, electric motors at a variable speed, universal engines, etc.D.

Coal brushes Hitachi 999059. Photos all tools.RU

Metallographite. It is made by mixing natural graphite with metals powder, primarily copper. The material has a higher electrical conductivity and low electrical resistance of the contact; current density is much greater than in other materials for brushes.

Applied For brushes of DC electrical machines operating at low speed and at low voltage: vehicle engines, low- and medium-sized synchronous engines with ring collectors and contact rings, etc.D.

Silver, obtained by mixing and sealing at high temperatures of graphite and silver powder.

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Possesses high conductivity and is used if it is necessary to reduce the voltage drop at the contact point.

Silverbrush brushes are indispensable if you need to control the voltage on the contact rings or collector of the electric machine with special accuracy.

Areas of use: Tachogenerators, low voltage micro subsidies, measurement signal transmitters.

A brief analysis of the above classification of materials for brushes shows that in the engine of your grinder. A universal engine engine. The manufacturer could apply Details made of electrographs, carleographic, solid coal or bakelite. The choice of material is dictated by many technical conditions, up to the physical properties of the alloy from which the collector lamellas are made. A significant role was played by the cost of details, important for serial production.

Recommendations for replacement and operation

Wire brushes on a grinder We wear out sooner or later. You can replace worn out with new ones, like any other tool used in the work of a universal grinding machine. For this, there is base puck with a hole under the threaded stiletor of the grinder. It is necessary to combine the basic washer of equipment with similar on the crust and twist it by hand using a puck with a thread that has openings for a special key.

Class novotools brush, corrugated brass, 150×22.2 mm. Photo by Eweld

The direction of the puck is made in such a way that during operation it will strive to drag on stronger. Included with a grinder is supplied key with pins for holes, with the help of which the tension is weakened when removing a worn roof. Some types of shells can be made complete with a threaded part on a nut for an ordinary wrench.

The technology for processing workpieces with wood has some features. The efforts of pressing the nozzle to the workpiece should not be very strong. Such actions will lead to the formation of strong roughness and deep scratches. To prevent such defects, the technology involves moisten the processed surfaces with special compounds (it is possible to use soap solution).

The work of a grinder with a nozzle in the form of wire brushes requires compliance with safety rules. During operation, as it is worn, the roots can fly out of the processing zone at high speed pieces of wire. Should Apply protection products From the body entering the body of such metal particles. First of all, it is necessary protect your eyes professional glasses that reliably preserve the organs of vision. Gloves will protect from hitting on the rest of the body, it is desirable to have work clothes. The mandatory presence of a protective casing was mentioned in the article earlier.

Forms

The structure of the location of the pile and the shape of the product depend on the work for which the nozzle is intended for the grinder. A competent choice is able to make life easier for the master performing work. The instrument market offers to consumers brushes of the following forms:

• Chalice. Cordrates in the form of a cup do a great job with hard processing of large areas. The vertical location of the pile on cup brushes provides the correct vector of effort.
• Conical. In these devices, the bristles are located at an angle relative to the base plane. This design allows you to process parts with minor recesses on the surface.
• Radial. Such nozzles are also called “brush-carzka”. They are designed to finish the products from the scale formed after the etching procedure. A special location of the pile allows you to work in hard.To.Reach places.
• Disk. This form is the most common. The stubble is located on the horizontal plane of the tool. This design is not suitable for large work, but it copes with narrow recesses perfectly.

For the manufacture of brushes, a wire of various types is used:

• Twisted. This type of execution is characterized by a wire twisted by harnesses in random order. The pressure on the surface is higher, however, the life is much less.
• Burnt. Nozzles on the grinder with a burning pile located in strict order are favorably distinguished by the strength of the structure, as well as the effect of independent sharpening during operation.
• Corrugated. The wave.Like structure of the wire gives the brush a springy effect. This softens the effect on the processed surface.

The size of the nozzle depends on the size of the grinder. Their diameter ranges in the range from 75 to 200 mm.