Homemade grinding nozzle for grinder. How is the replacement of brushes on the grinder. Rough cleaning of wood

Metal brushes for grinders (shm)

In various fields of human activity, where processing of materials is needed, a large role is given to grinding. After all, the product will not look ready (as a rule, it will not lose functionality) if it has bulges or burrs. For this purpose, special grinding materials should be used, among which nozzles for an angle grinder (we are talking about the “grinder”, as it is commonly called) in the form of brush brushes are of great benefit. Read more here.

What are the brushes for grinders?

Now Russian manufacturers offer different variants making brushes for angle grinders. They mainly differ in the material for the villi, starting from which the nozzles are divided according to their own rigidity. Nettle, for hard brushes use stainless steel towed wire. The choice of this material was not accidental, because it allows you to work without much wear in quite aggressive environments. Alloyed metal endures impact high temperatures that occur during processing (it is also worth considering the fact that heated products are often processed with such equipment). The protective layers do not allow the metal to be affected by corrosion, which significantly increases the service life of the angle grinder brush.

Look around. Shields for angle grinders (grinders).

Circles for the grinder test comparison PAINT REMOVAL

Paint stripping disc for angle grinder grinder) Used to remove and clean metal

Soft brushes more often are also made of metal wire, but its diameter is noticeably smaller. If the rigid options come with dimensions of 0.5-0.7 mm, then for these they already use a wire with a diameter of 0.3 mm. They provide gentle cleaning, which is ideal for final processing of products. In this case, you can find both wicker options and corrugated ones (the choice depends on the type of work being done).

What brush to choose?

Varieties of nozzles

Processing of wood and other surfaces different type tools. Nozzles for the grinder are divided according to the class of processing, the degree of rigidity and roughness. For example, cutting discs are divided into several categories:

To work with metal, tools of various diameters and thicknesses are used. Common sizes in diameter range from 110 to 230 mm, and thickness reaches up to 3 mm. The parameters depend on the goals, the force of the applied load.
Sawing and grinding of stone materials is carried out with disks of identical sizes, differing in the parameters of education.
Wood discs are used with extreme caution, if safety precautions are not followed, there is a risk of injury. the best safe option is to use a tool with fine teeth. It is forbidden to remove the casing of the rotating element of the grinder. When working on wood, the best option is to use a stationary fixture for a grinder.
The diamond disc has gained the most popularity, because. used when working with various materials. It is used mainly when working with granite, tile, stone or concrete. Materials involve the use of different discs for each composition, differ in the structure of the edges and the presence of slots.

When choosing a cutting disc in a store, it is difficult to determine the direct purpose in appearance, the location of the edges. In order to choose the right disc, you need to familiarize yourself with the purpose on the package.

Rough processing

During rough processing, work is carried out with two main nozzles - peeling and planer disk. The work of the grinder with this type of discs is carried out with a protective cover, because. pieces of wood can scatter in different directions. The planer disk is used in cases where roughing is necessary, preparation of fence supports, construction of a log house, etc.

Special milling cutters are produced, the assortment on the market is plentiful, each tool differs in purpose and features. Main areas of application:

pre-alignment of edges;
sawing or cutting a bowl from blanks of small section;
groove selection.

When working with milling and grinding nozzles with a grinder, it is forbidden to remove the protective device - the tool casing. Each tool has a technical purpose and instructions that clearly describe the materials suitable for work, the modes of operation of the tool.

Grinding

The main purpose of the grinder is grinding. For work on the processing of materials, there are cord - brushes, end, petal devices. Cord - brushes are used for grinding wood of a rough class, removing irregularities, giving the workpiece the required dimensions. The processing of the ends of lumber is carried out by using end discs.

Polishing

Giving a perfectly smooth surface, gloss to wooden blanks is carried out by the polishing process. When polishing or grinding with a grinder, a different number of nozzles are used, such as felt, fine-grained sandpaper or a sponge. Such designs were widely used in the form of Velcro, on which the base for the grinder is attached. In the process, the spent part is easy to change without using a special key to replace the disk.

Sandpaper

The most versatile tool for woodworking is sandpaper or a grinding wheel. Main areas of application:

parquet cycling;
processing of ends, edges of wood;
grinding;
sweep wooden surface before painting.

The design of the attachment for the grinder is a support that is attached to the grinder, sandpaper is attached with Velcro over the tool. This method fasteners make it easy to replace the spent element, choose the grain size.

Nozzle with Velcro

The main repurposing of easily removable kits is polishing various materials. It is possible to use the tool when working with stone, metal, wood and other materials. The main parameters, characteristics of the nozzle - Velcro:

a platform is taken as a basis, the diameter of which is mainly 125 mm, fastening occurs with the help of a special Velcro;
fastening takes place on the mounting platform, which is fixed on the grinder;
the grain size of the sandpaper for the grinder is different, from large marked p40 to fine p220.

There are varieties with holes, they are adapted for vibro-grinding devices. Before buying, you need to pay attention to the diameter, grain size.

Wooden surfaces are easily sanded with petal nozzles. The constituent part has sandpaper superimposed on each other over the entire area of the tool. Due to the dense design, competent use, it is possible to use the kit long time, unlike analogues.

The petal nozzle on the grinder is used incrementally. At the first stage of processing, a set of coarse abrasive is used, then medium and fine sections.

Metal brushes

Many craftsmen believe that metal brushes are used to clean rust and oxides of only steel products. In refutation of this fact, brass wire products are popular in wood processing. Relatively low price, increased resource during operation, make the brush a direct competitor of abrasive nozzles.

It is necessary to carry out work at low speeds, therefore, a grinder with adjustable shaft speed is used. Polishing, processing of stone surfaces is carried out with different grain sizes, from 30 to 2000-3000. There is a special nozzle marked BUFF, which allows you to polish products to a perfect shine, to get a mirror effect.

What are the circles for cutting wood

Processing wood with a grinder is a safe process, unlike cutting. The process is very traumatic, the tool is not intended for cutting wood. Soft woods are processed with a nozzle on the grinder with extreme caution, because. the tool can jam and pull out of your hands. The process of cutting at high speeds implies a high temperature effect on the disc material, as a result of which it can simply shatter into small pieces.

Despite the fact that the grinder is not suitable for cutting wood products, manufacturers offer various cutting discs for use. It is recommended to use the grinder as a stationary station when sawing wood.

Circular saws

Nozzles in the form of a circular saw are dangerous when using angle grinders. The diameter of the circle must be selected based on the parameters and dimensions of the tool in order to be able to use the protective cover.

There are more expensive modifications of circular nozzles, they have anti-jamming protection. The design has set teeth in different directions, a smaller size, the price of such a device is different, but you should not save on health.

Chain saws

A more secure design has a chain type of nozzles. The saw blade, in which the chain from the chainsaw is used, eliminates jamming of the tool and reduces the risk of injury during work. The design has a system that allows the main element to continue rotating, which is attached to the angle grinder, and the chain can remain stationary.

Chain discs are distributed in many different modifications, with which it is possible to perform dacha work or use for harvesting small firewood. Disk chain structure it can be used instead of peeling, for cutting cups in a log or removing a layer of bark.

Saws with few teeth

Increased safety when working with wood is achieved by using discs with a small number of teeth. Small discs usually have 3 teeth, diameters over 180 mm - 4 teeth. The presented type of cutting disc is used for cutting both along and across the grain of the wood. The saw wheel makes it possible to cut grooves, make spikes of various shapes.

It should be understood that when working with a grinder, it is necessary to adhere to the technical regulations. It is not necessary to install discs of larger diameter bypassing the protective cover, smaller discs can be used without loss of cutting properties.

Tungsten Carbide Discs

Tungsten carbide cutting discs are produced relatively recently, they are popular when working with a grinder. The universal tool is not equipped with teeth, instead of cutting elements there are cutouts in the disk. The work of the tool is most safe when cutting wood, it excludes jamming when nails or thick bars of wood get in. Appearance looks like diamond disc cutting concrete, the purpose is indicated on the packaging or instructions.

The price of such a disk is high, but it is justified. It is worth overpaying for a modified tool than going broke for the sad consequences of using a regular saw blade.

Wood sanding attachments

For the grinder, special nozzles have been developed that allow brushing, peeling, milling, and other work. It is necessary to choose the right tool in accordance with the material and type of work. The grinding nozzle for the grinder is used from the degree of processing of the material, they differ in shape and size.

Peeling nozzles

Peeling type nozzles are used in most cases to remove the top layer from the surface or paintwork. Different kinds help to carry out work in accordance with the necessary technical parameters.

The end of the product is ground using a nozzle with crumbs and spikes, an abrasive grinding emery wheel.
Thanks to the variety of the spiked nozzle, it is possible to process surfaces of different heights, grind off the required layer.
Nozzles of their twisted wire are used for rough cleaning wooden products have various modifications.

It is important to understand that the use of coarse wire or peeling nozzles for a grinder can be unsafe; during operation, it is possible to hook a nail or a thick rod, which will lead to the tool flying out of your hands.

Sanding and polishing tips

Various surfaces, including wood, are polished with a special type of nozzles. The kit is attached by using a bolt that is screwed onto the shaft and tightened with a bolt. Often equipped with a special device that mounts to a drill.

Felt discs are used instead of a wheel for grinding wood, the design is attached with Velcro, which allows you to replace the used tool without removing the grinder from the shaft. The petal disc has become widespread in the processing of wood. The name is taken from the shape, the location of the processing surfaces.

The use of a grinder or grinder depends on the specific situation. For application regular paint a wood grinding nozzle for a grinder is suitable, deeper processing with a grinder is not allowed, because. scratches may be visible after painting. The longitudinal belt sander moves in the same direction and uses different grits of sandpaper.

What you need to pay attention to when choosing a nozzle for a grinder

Some angle grinders come with a small diameter of the installed nozzle, as a result of which the craftsmen remove the protective cover, which is very dangerous when working with wood. It is necessary to take a break when working with a tool, because. wood chips can clog the cooling holes in the case. The grinder is used only for wood processing; a special machine is used for sawing.

Home \ Accessories and consumables \ Brushes for grinders (brush)

In various fields of human activity, where processing of materials is necessary, a significant role is given to grinding. After all, the product will not look finished (and in most cases will lose functionality) if it has bumps and burrs. To do this, you should use special grinding materials, among which nozzles for an angle grinder (we are talking about a "grinder", as it is called in everyday life) in the form of brush brushes are of great benefit. Read more here.

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What are the brushes for grinders?

Manufacturers today offer various options execution of brushes for angle grinders. First of all, they differ in the material for the villi, depending on which nozzles are divided according to their rigidity. For example, for hard brushes, stainless steel wire is used. The choice of this material was not accidental, because it allows you to work without much wear in quite aggressive environments. The alloyed metal endures the influence of high temperatures that occur during processing (it is also worth considering the fact that heated products are often processed with such equipment). The protective layers do not allow the metal to be affected by corrosion, which significantly increases the service life of the angle grinder brush.

Soft brushes are most often also made of metal wire, but its diameter is noticeably smaller. If the rigid options come with dimensions of 0.5-0.7 mm, then for these they already use a wire with a diameter of 0.3 mm. They provide gentle cleaning, which is ideal for final processing of products. In this case, you can find both wicker options and corrugated ones (the choice depends on the type of work being done).

What brush to choose?

Another point that you should pay attention to when buying is the shape of the nozzle. For angle grinders, two options are most often used: “cup” and “disc”. Disc-shaped brushes are used to process joints and joints in hard-to-reach places, such as grooves or corners. Cups are ideal for processing even surfaces, especially large areas.

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How to choose a corset and how to work with it?

Metal brushes for grinders amaze the imagination with their variety. Their main purpose is to clean metal from old paint, from corrosion. True, there are hand brushes with wire bristles for small amounts of work.

What kind of tool is a grinder?

Bulgarian or corner Grinder- the tool is universal and necessary in the economy. This tool is used by painters, locksmiths, carpenters have in their arsenal. Its significance varies depending on the nozzles used. Put a circular disc on the machine - and you can cut wood. More often, the grinder is used in locksmith work for cutting metal: pipes, fittings.

But its main purpose is grinding work. With the increase in secondary sales of cars, the demand for their repair and painting is growing. The most difficult stage in this work is preparatory, that is, cleaning the surfaces of machines from old paint and primer. The cleaner the body is before the new primer, the better the new paint will hold. In this work, a grinder with a set of grinding brushes plays a leading role.

What are the brushes?

Metal, bowl-shaped koroschek appeared relatively recently. And before that, grinders worked mainly with sandpaper of various types or emery stone discs. Paper, no matter how high their rigidity, was quickly clogged with ink particles or erased. It often had to be changed, which reduced productivity. Working with a metal brush for a grinder is much more effective in this regard.

Virtually every leading tool manufacturer has seen fit to bring their brushes to market. And each manufacturer has its own approach, its own exclusive in the development and manufacture of a metal nozzle for angle grinders. Some cork brushes are made from a single thin wire, others from a twisted cable, and still others from a corrugated corrugated wire. Wire cord brushes differ in diameter, stiffness, bristle quality. Corsets as nozzles for angle grinders are:

Metal brushes are made from:

become;
steel with brass coating;
brass;
copper.

There are polishing brushes for processing metal surfaces and woodwork. They are made from nylon and other polymers, dried seaweed, cotton fibers.

The hardness of processing depends on the structure of the wire, its hardness and thickness. The thinner the wire used in the manufacture of the brush, the softer it acts on the metal. To clean the surface old painting on initial stage it is better to use a nozzle with hard bristles, and for the final cleaning of the remnants of the primer and other materials, a nozzle with less rigidity is suitable, which will not “eat up” bare metal.

For the manufacture of cork brushes, wire is used:

Corrugated. This brush, due to its springy properties, softens, on the one hand, the impact on the metal, and on the other, the vibration of the machine is reduced.
Twisted. The bristles twisted together provide rigidity to the surface, break less and fly out as they wear. Twisted fragments are untwisted, freeing the bristles for work.
Smooth.

The brushes differ in the diameter of the cup, which determines the parameters of the simultaneously processed surface. Brushes for angle grinders are consumables, but manufacturers are concerned about making them as efficient as possible and extending their life.

How to call them correctly?

In the network and on the labels there is a discrepancy in the name of the nozzles. Some call them cord brushes for a grinder, others call them cord brushes. What are they really called? Cord is translated from English as a string, cord, rope. And if you look closely, these nozzles are made from a variety of steel (or nylon), cut into short bristles, strings or twisted cords. So the essence of this name becomes quite clear - cord brush. Those who write korshchetka obviously took the name of the nozzle by ear, and since the letter “d” is most often swallowed during pronunciation, they began to write it that way. I don’t know about spelling dictionaries, but the Word program in which this article is being written recognized the spelling cord-brush as correct - with a hyphen.

Brushing as a process of working with a brush

Brushing is the process of treating metal surfaces with metal brushes in order to remove loosened sludge or scale formed during the pickling process. This work can be done manually or with power tools. The brushes for angle grinders themselves are called brush heads. With this treatment, the porosity of the galvanic deposit decreases, it becomes denser. The processed surface turns out more uniform.

Brushing of steel surfaces is carried out with steel brushes with a wire diameter of 0.2–0.4 mm. Non-ferrous metals are processed with copper or brass wire brushes. Electroplating is also subjected to brushing in order to increase the density of the coating and give it shine.

Brushing is done according to:

dry surface;
surfaces wetted with water, soap or soda solution.

When brushing with metal brushes, abrasive pastes are not used, since the ends of the wire bristles serve as the abrasive.

How to choose a quality brush?

When choosing a brush for angle grinders, pay attention to the bristles. It should be distributed evenly over the entire disc, the bristles should be the same length everywhere and evenly distributed around the entire circumference of the calyx. It is unacceptable when the bristles are thickened on one edge and thin on the other. Such a brush will beat in the hand (vibrate), cleaning will be uneven, and the brush itself will fail very soon.

Among the parameters for the wire nozzle, manufacturers indicate the recommended speed for the machine. This indicator should not be ignored. If you put a low-speed brush on a high-speed machine, it will not give the desired result and will quickly fail. Conversely, a metal brush, which the manufacturer has designed for high speed operation, will not work with proper performance at low speed.

The smaller the diameter of the cup, the less the load on the engine of the machine, the less vibration, and, accordingly, the less tired the hand. But the larger the diameter of the cup, the fewer passages are obtained. Which brush to choose? There is no definite answer here. Sometimes masters have time to try several brushes different diameter and different bristle stiffness before they find best option. The choice of brush often depends on the quality of the paintwork. After all, as you know, different enamels and primers have different coating densities.

The creative thinking of our people knows no bounds. This recommendation, aimed at improving the performance of brushes, was found on the forums of the masters.

Everyone knows that the bristles of the sanding head wear out over time, and this abrasion rate depends on the stiffness of the bristles and the aggressiveness of the surface to be treated. In some brushes, the outer cup is larger than the inner cup, which allows you to extend the life of the brush a little, by 15 percent. This can be achieved by cutting off the upper edge of the outer cup of the brush by 5–7 mm.

Safety

In the process of surface treatment, whether it be metal surfaces or wood, safety precautions must be observed. The fact is that the higher the speed of rotation of the disc on the angle grinder, the faster the brush wears out. Metal bristles fly off from it, grains of scale and metal burrs fly off from the treated surface. It happens that the cup does not withstand the load, and the brush itself shatters.

And all this literally shoots at a working person. Therefore, when working with such a brush, you need to have goggles, a respirator, gloves, and preferably tight overalls. Even if the sun is shining and the heat is unbearable.

The loud sound of the grinder is tiring, making the worker irritable, so it is also recommended to have headphones. Some workers combine business with pleasure and muffle the sound of their grinder with their favorite music by inserting headphones from a player or phone into their ears.

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Cup brushes

Helpful information

For the initial processing and grinding of metal parts, a cup brush is needed. Tooling for a drill does an excellent job of removing rust, various contaminants, old paintwork from metal.

The nozzle has the shape of a cup. On the working surface there is a brass wire twisted or twisted into several bundles. It is attached to the tool with a nut located in the center of the cup brush and having an internal thread.

What to look for when choosing cup brushes for grinders

The thread of the mounting hole of the nozzle must necessarily match the size of the external thread of the tool spindle. The most commonly used thread is M14, there are brushes, for example, with M10 thread.

The brush diameter is selected based on the surface area to be sanded. If you want to process, for example, the wall of a small barbecue (20x20 cm), then a cup with a diameter of 60 mm will do. For large areas, such as profile sheets (150x150 cm), a nozzle with a diameter of 150 mm is required.

You can buy a corset cup in our online store. Call 8-800-333-83-28 or order a call from the site.

Manufacturers

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Metal brushes. The basics of using brushes for grinders, drills and machine tools.

Every man is familiar with metal brushes. They apply in all areas. machining any materials. They are effective, easy to use and have a low price.

But the correct selection and use of technical brushes will increase the performance and resource of brushes, as well as improve the quality of processing.

To work correctly with a brush - to achieve the quality of processing.

In this article, we have collected information on the correct selection of operating modes and the choice of technical brushes that are optimal for solving your problem.

The method of selecting the operating mode.

In case of insufficient effect, you should:

Increase the speed by using a larger diameter brush and/or increasing the RPM (do not exceed the maximum allowed!)
Use a brush with a shorter bristle
Apply a brush with a larger diameter wire

If the effect is too strong, you should:

Reduce speed by using a smaller diameter brush and/or reducing RPM
Apply a brush with a longer bristle
Apply a brush with thinner wire

When filling up burrs, you should:

Increase speed and/or use a shorter bristle brush
Check the position of the brush and the workpiece: the brush should hit against the cutting direction and work with the tips of the wires
Use a wider brush
Use a brush with a larger diameter wire

Correct clamping force.

A prerequisite for successful brushing is a light pressure, as only the tips of the wires do the work. The lack of speed cannot be compensated by the clamping force. Squeezing destroys the brush faster.

Line speed.

The speed indicated on the brush or in the catalog is the maximum safe. Usually, the operating modes of brushes are much lower than safe ones.

To use quality correctly is to work effectively.

Processing of welds.

Cold-drawn wire is used with a self-sharpening effect that provides bare-metal stability that outperforms competitors by up to 25% in tensile strength and up to 13% in hardness.

Treatment of hard-to-reach places.

Pay attention to the conical brushes, which make it possible to work in right angles. But at the same time, they can be used for processing edges, grooves and surfaces, including concrete.

Speed not less than 35-45 m/s, *6000-12000 rpm.

Surface cleaning from rust, paint.

If you are working on a surface with an angle grinder, such as body work or a fence, then use a cup brush. For drills cup or cylindrical with a shank.

Shank brushes 3000-15000 rpm

Deburring

Corrugated wire technical brushes are best. Important speed is not less than 35 m / s, work with the tips of the wires and the direction of rotation of the brush against the direction of cutting.

Removing the anti-corrosion coating

Speed not less than 5-25 m/s * 3000-15000 rpm

Body work

Removal of rust and paint without thinning the metal, without the cutting operation characteristic of abrasives, with a subsequent decrease in corrosion resistance.

Speed not less than 5-25 m / s (cleaning) 35-45 m / s (finish)

*3000-15000 rpm

Removing tarnish colors

Corrugated stainless wire shank and cylindrical brushes easily remove tarnish from welds. Unlike the use of chemicals, there is no need for washing, drying products and special storage of chemicals.

Speed not less than 30-40 m/s * 10000-15000 rpm

Cleaning, Texturing and Finishing with Polymer Abrasive

Well proven when processing soft sensitive surfaces. The brushes are suitable for processing wood and plastic. Prevent overheating - the polymer bond of the abrasive has a relatively low temperature melting.

Speed not less than 5-20 m/s *1000-4500 rpm

Processing in cavities

End brushes also pass into small holes. End harnesses open with increasing speed and can process hidden grooves and internal surfaces.

Speed not less than 5-35 m/s *3000-15000 rpm

Universal Tool

If you are unable or unwilling to use the drive, use hand brushes. Pay attention to right choice pile material depending on the material being processed.

Note:

There are brushes with a shank for drills that can withstand a maximum speed of 4500 rpm, and professional ones that can withstand up to 20,000 rpm.

The higher the speed, the higher the cleaning effect, as a rule.

Thick wire (0.50-0.80 mm) for rough, aggressive cutting.

Fine wire (0.10-0.35 mm) for finishing.

Steel wire: for processing metal surfaces.

Steel wire rope: increased hardness and self-sharpening effect.

Corrugated steel wire: flexible, different aggressiveness depending on the wire diameter.

Stainless steel wire: for processing stainless steel and aluminium.

Brass wire: for soft materials, bronze and copper.

Polymerabrasive: finishing, roughening and texturing.

When you have chosen the right operating modes and selected the right brush, it is important not to forget about the most important thing - safety.

Observe necessary measures safety when working with driven brushes:

People who are in the area of work with power brushes must wear goggles or a mask.
Inspect the brush before use for mechanical damage.
Pay attention to the correct attachment of the brush to the driven tool.

For your safety: wear protective clothing.

Every man knows. They are used in all areas of mechanical processing of any materials. They are effective, easy to use and have a low price.

But the correct selection and use of technical brushes will increase the performance and resource of brushes, as well as improve the quality of processing.

To work correctly with a brush - to achieve the quality of processing.

In this article, we have collected information on the correct selection of operating modes and the choice of technical brushes that are optimal for solving your problem.

The method of selecting the operating mode.

In case of insufficient effect, you should:

Increase the speed by using a larger diameter brush and/or increasing the RPM (do not exceed the maximum allowed!)
Use a brush with a shorter bristle
Apply a brush with a larger diameter wire

If the effect is too strong, you should:

Reduce speed by using a smaller diameter brush and/or reducing RPM
Apply a brush with a longer bristle
Apply a brush with thinner wire

When filling up burrs, you should:

Increase speed and/or use a shorter bristle brush
Check the position of the brush and the workpiece: the brush should hit against the cutting direction and work with the tips of the wires
Use a wider brush
Use a brush with a larger diameter wire

Correct clamping force.

Line speed.

The speed indicated on the brush or in the catalog is the maximum safe. Usually, the operating modes of brushes are much lower than safe ones.

To use quality correctly is to work effectively.

Cold-drawn wire is used with a self-sharpening effect that provides bare-metal stability that outperforms competitors by up to 25% in tensile strength and up to 13% in hardness.

Pay attention to the conical brushes, which make it possible to work in right angles. But at the same time, they can be used for processing edges, grooves and surfaces, including concrete.

Speed not less than 35-45 m/s, *6000-12000 rpm.

If you are working on a surface with an angle grinder, such as body work or a fence, then use a cup brush. For drills cup or cylindrical with shank.

Shank brushes 3000-15000 rpm

Corrugated wire technical brushes are best. Important speed is not less than 35 m / s, work with the tips of the wires and the direction of rotation of the brush against the direction of cutting.

Speed not less than 5-25 m/s * 3000-15000 rpm

Removal of rust and paint without thinning the metal, without the cutting operation characteristic of abrasives, with a subsequent decrease in corrosion resistance.

Speed not less than

5-25 m/s (stripping)

35-45 m/s (finish)

Corrugated stainless wire shank and cylindrical brushes easily remove tarnish from welds. Unlike the use of chemicals, there is no need for washing, drying products and special storage of chemicals.

Speed not less than 30-40 m/s * 10000-15000 rpm

Well proven when processing soft sensitive surfaces. The brushes are suitable for processing wood and plastic. Avoid overheating - the polymer bond of the abrasive has a relatively low melting point.

Speed not less than 5-20 m/s *1000-4500 rpm

If you are unable or unwilling to use the drive, use hand brushes. Pay attention to the correct choice of pile material depending on the material being processed.

Note:

There are brushes with a shank for drills that can withstand a maximum speed of 4500 rpm, and professional ones that can withstand up to 20,000 rpm.

The higher the speed, the higher the cleaning effect, as a rule.

Thick wire (0.50-0.80 mm) for rough, aggressive cutting.

Fine wire (0.10-0.35 mm) for finishing.

Steel wire: for processing metal surfaces.

Steel wire rope: increased hardness and self-sharpening effect.

Steel corrugated wire: flexible, different aggressiveness depending on the wire diameter.

Stainless steel wire: for stainless steel and aluminium.

Brass wire: for soft materials, bronze and copper.

Polymerabrasive: finishing, roughening and texturing.

When you have chosen the right operating modes and selected the right brush, it is important not to forget about the most important thing - safety precautions.

Observe the necessary safety measures when working with power brushes:

People who are in the area of work with power brushes must wear goggles or a mask.
Inspect the brush before use for mechanical damage.
Pay attention to the correct attachment of the brush to the driven tool.

For your safety: wear protective clothing.

Brushes are called both current collectors inside the grinder - a necessary element of the electric motor, without which the angle grinder, like any other electric tool, will not be able to work, and removable nozzles that allow cleaning, grinding and even polishing various surfaces with this tool. In this article, we will try to deal with those and other brushes.

Brush Features

If we talk about electric brushes, then first you need to explain the name. This device was called brushes in the early days of its existence (the beginning of the 20th century), when, indeed, a design resembling a brush or, more precisely, a brush was used to remove current from the rotor of an electric motor. Such a device, although high efficiency, turned out to be too short-lived and was replaced by a more durable one, made of a dense material into which a copper wire is pressed.

The movement of the rotor of the electric motor causes constant friction of the working surface of the electric brushes, which is the main reason for the failure of this part. As a result, they have to be changed periodically. This process is natural and inevitable during long-term operation of any power tool. It is very simple to identify brush wear: a previously reliable unit will start to work intermittently, the characteristic smell of ozone may appear from the abundant formation of sparks in the current collector. It is advisable to replace the electric brushes at the first sign of wear.

Electric brushes are graphite, carbon or metal-graphite. In all varieties, the main material is carbon.

In the first case, the product is pressed at high pressure, and then thermally processed, gaining increased wear resistance. The coal option is the cheapest, as it does not involve heat treatment. These brushes are the least durable. Metal-graphite brushes are the most expensive, since, in addition to carbon, they contain metal powder. This is the most wear-resistant option, which in household appliances can be found very rarely. As already mentioned, a removable attachment for a grinder is also called a brush.

In order for the UMSh (angle grinder) to perform its main functions, it is necessary to install one or another nozzle on it. These can be cutting or grinding discs or brushes with various kinds of pile, fixed in a circle. Such a removable device is called a cord brush or even shorter - a cord brush. Brushes, like discs for UMSh, are consumables. During operation, they wear out, and they need to be changed. The brushes for the grinder are designed in such a way that they are mounted on the rod thanks to the hole in the center, this is their main difference from the brushes for the drill, which have a shank for their installation in the drill chuck.

The bristle of the brush, depending on the specifics of its application, can be steel, brass, polymer fibers and even wool.

What are they for?

In this section, we will not talk about electric brushes for a long time, their purpose is to remove current from the rotor (armature), in other words, without them there will be no rotation in the electric motor, the rod of the power tool will not rotate, and it will not work. But about the cord brushes you need to say more. They are used for mechanical processing of various materials. different types These attachments are used for cleaning before painting or priming, for brushing wood, for removing old paint from various surfaces, for polishing, sanding, smoothing corners and other operations.

They are especially necessary for cleaning metal products after welding, in order to remove scale.

Classification

As already mentioned, electric brushes can be classified according to the material from which they are made. Graphite brush, as the name suggests, is made of graphite, which is added with carbon black and binding elements. This type of current collectors is most often used for UMSh.

The carbon brush is made of the same material, but without heat treatment. Such a product wears out much faster and is practically not used for grinders. It is important not to make a mistake when purchasing replacement brushes. Carbon brushes on the grinder will not last long.

A metal-graphite brush is used in large industrial units, and it is unlikely that it will be possible to install it on a grinder. This is the most durable product, characterized by a very high price. The variety of cord brushes is much greater, their shape, material and size vary significantly, which is determined by the variety of applications for such equipment. They can also be classified according to the material from which they are made. The most popular brushes with metal bristles. A metal brush is a fairly versatile nozzle. For the manufacture of such products, both metals and alloys are used.

For work on metal, steel brushes are used. Stainless steel brushes are best used on stainless steel or aluminum. Often the steel pile is covered with brass, such brushes do not corrode. There are also pure brass brushes - despite their great softness, they have a number of advantages: a relatively soft effect on the material, the absence of sparks when working at high speeds, and the absence of scratches during surface treatment.

The wire for such brushes can be different. Twisted wire is usually the most rigid, it can be assembled in bundles (they are more rigid and can self-sharpen) or fixed randomly. With the help of such effective nozzles, welding scale or rust can be torn off. The corrugated cord brush has a wave-like curved pile and, unlike the previous type, does not affect the surface so intensively. With its help, you can clean the surface of old paint.

Flat bristle brushes have the widest range of applications, they are the most versatile and can be used on any surface. Their effectiveness may be somewhat lower than that of specialized nozzles. Nozzles with polymer bristles, such as nylon, are used for polishing various surfaces, including metal. They can be successfully used for woodwork - to highlight the texture or finish. Plastic brushes are often used to work with soft materials.

Brushes can also be divided by shape.

Cup is used to work with large surfaces. Its form follows from the name. On such a brush, most often, a clamping nut is immediately fixed, since the special key provided with the grinder cannot be applied to it. The conical brush is used to work on concave surfaces. Radial, as a variety flat brushes, used for processing hard-to-reach areas. The disc brush, the most common type of cord brush, also has a flat shape and can be used for processing a wide variety of small surfaces.

And cord brushes are divided into size groups. The diameter of the brushes is determined by the technical capabilities of the grinder and the scope of this nozzle. Brushes with a diameter of less than 115 mm are usually used for processing small surfaces. It is better not to use a circle of more than 200 mm for a small angle grinder, you will have to remove the protective cover, and this is a violation of all safety standards. Such large brushes are usually used for processing large structures and only with the help of large powerful UMShs.

The most acceptable for domestic purposes is the brush diameter of 125 mm. It is possible to offer a fourth classification of cord brushes - by application. Brush brush, the name is given from the name of the technical operation, which is carried out with the help of this nozzle. Brushing - preparation of the surface for subsequent processing: removal of rust, paint, dirt. At some stages, this process chemical exposure on the surface of the product, but the initial processing is mechanical cleaning surfaces. For mechanical brushing, metal (steel or brass-plated) brushes are used. The purpose of this treatment is to remove scale, oil stains, small defects, barbs and the like. Without brushing, it is sometimes difficult to assess the quality of the weld, adhering scale can hide some defects.

For processing soft materials (plastic or wood), nylon, tow (sisal) and hair stripping brushes are used. Such brushes must be moistened with special emulsions (for wood, you can use vegetable oil), otherwise the surface will be matte.

How to choose?

In stores, the choice of cord brushes for grinders can be very wide. Consider what you need to consider when choosing this type of nozzles. The selection parameters can be dictated by the nature of the work to be done and the size of the angle grinder on which the brush will be installed. On a small grinder, in no case should you install a nozzle designed for a large unit. It is also important to know the number of revolutions of the grinder, the brush must be selected in accordance with this indicator. If on a fast angle grinder there is a circle designed for low speeds, its effectiveness will be small, since, most likely, it will fail before the end of the work. Working on a “slow” angle grinder with a nozzle for a revolving unit will be very laborious and will take much more time than with a brush corresponding to the capabilities of an angle grinder.

If you have decided on the size and type of brush, you should pay attention to its quality. The wire iron brush should have an evenly distributed pile, individual fibers should not be longer or shorter, this factor can cause poor surface finish and excessive vibration, therefore, the load is not only on the parts of the grinder, but also on the hands of the one who will do the work.

Excessive vibration of the machine during operation - main reason high load on the muscles of the hands. With a brush with a small diameter, the vibration is always less. A polymer brush is the lightest type of cord brush, and the vibration with it is the smallest, but not every surface can be treated with such a nozzle. A polymer-abrasive brush is used for brushing (aging) wood, and you should not try to process metal with it.

If you have no experience with cord brushes, of course, you need to consult, and sometimes you have to purchase several different nozzles in order to determine in practice in the process of work best model. The most popular manufacturers of cord brushes, presented on the shelves of specialized stores, can be built into a kind of rating. Russian brands: Zubr, Praktika, SibrTech, Enkor. Foreign: DEXX, FIT, MATRIX, Lessmann, Wortex.