How to choose brushes for corner grinders. Criterias of choice

How to choose graphite, copperographic and coal brushes for an electric motor, generator, converter and other electric machines.

Graphite, medicalographic and carbon electrical concrete brushes, (in the text further “brushes”) are used in many electrical machines, where it is necessary to provide mobile electric contact. In the process, the brushes wear out, decreasing in length, and sooner or later the moment comes when the worn brushes must be changed to new. For the correct selection and replacement of worn brushes, you need to know the following parameters:

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For example 10×12.5×32. The first two digits are the size of the window into which the brush is inserted, the last number is the length of the brush, it will wear out during operation.

There are two main types of brush, these are: single and split.

A single brush This is a whole block with whether without them, it looks something like this:

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Most electrical contact brushes for generators are single.

A split brush These are two bars united by a common wire, it looks something like this:

Clushed brushes. These are two brushes erected by one current.Pissing wire. For example, the size is written 2/16x32x40 K1-8 (type of structure), the same size can be recorded as 32x32x40 K1-8 rub (the letter P in the structure means that the brush is split.)

Large electographic brushes are made split for the best electrical connection and optimal wear during operation.

This is what the brush consists of. Conventionally, all brushes are divided into two categories: these are graphite and copperographic.

Graphite brushes consist of graphite of various densities and with various additives and binders that give the material the necessary characteristics.

In addition to the above, copperographic brushes also have non.Ferrous and precious metals such as copper, lead, tin, silver, which makes them more solid, wear.Resistant and allows you to skip large currents, but at the same time reduces the linear speed of operation of the brush (linear speed is speed with which the brush rubs on the surface of the backcrowing device). Separately, we note that you can buy these metals separately, for example, lead in a flair.

When replacing the spaced brushes, it is best to put the brushes of the same brand, however, in the vast majority of cases, replacement with other brands with not very different characteristics is allowed. The brand of the brush material is usually indicated either by the symbol on the body of the brush, or on the terminals of the wire, or a full brand is written on the body of the brush. If the marking is indicated by the conditional number, then to decrypt the brand you can use the table of conditional and complete designations of the brushes.

In one article, it is difficult to reveal all the information on the labeling of the goods, for example, there are several marking technologies. Capabrape, thermal, laser and thermalrinosphere.

Deciphering the conventions of the brands of the material of the brushes

Symbol Complete designation Symbol Complete designation Complete designation Complete designation
nine MGS5 56 611om 83 M3
12 EG2A 59 EG4E 84 EG84
fourteen EG4 61 EG61 85 EG85
17 Mg 62 EG62 86 M6
eighteen EG8 63 EG63 87 EG51A
nineteen MG4 65 EG17 88 611m
20 G20 66 EG13P 89 MGS9A
21 MGSO 67 EG13 91 MG64
32 G22 68 EG2AF 92 MGSO1
34 G21 71 EG71 93 M20
41 EG14 72 MGS20 94 20
43 G3 74 EG74 95 MG4S
44 G4 74k EG74K 96 96-0
fifty EG50 75 EG75 97 M1a
51 EG51 77 MGSOA 103 G33
52 MGS21 79 EG74AF 106 EG86
53 MGS51 81 M1 108 EG84-1
82 MG2

Instructions for the manufacture of electric grinders to the Makita Peorator

As you know, the main source in the penarator is brushes. It is important to monitor their condition and cleanliness of the collector. Makita 2450 and 2470 peorators, CB-419 coal brushes are used.191962-4. Factory charcoal brushes are recommended to replace after 80 hours of work. Both brushes are subject to replacement, regardless of the degree of wear.

Signs of wear of brushes

Do not confuse the usual slight sparking that is present when working with a partial skipping of sparks in a circle, this is permissible when loading and the new tool has not been lost until the brush has been lost.

The first manifestations of wear of brushes are strong sparking and extraneous sound. Stop work immediately!

Timely replacement of coal brushes prevents the failure of more expensive parts.

The conclusion is simple: more often change coal electrographs. Do not forget, with a malfunction of one brush, the other should change automatically.

The critical length of the coal brushes of the Makita peorator cannot be less than 8 mm

When replacing it is worth taking a closer look at the anchor, what is the production of the collector. With a noticeable deepening, the collector should be polished to an even state, if this is not done, even the original new brushes will spark, which will lead to more burning out the collector.

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After installing new brushes, be sure to get stuck in idle without load at least 10 minutes.

A set of new carbon brushes Makita 2450 and 2470

The procedure for the manufacture of coal from other brushes

Coal electric shows can be purchased at almost any power tool store. But there are times when there is no store nearby, but you need to work.

There is a way out: you need to make brushes on your own from the brushes from other power tools. An important point is the selection of electricle, similar in its characteristics.

The incorrectly selected coal rod will lead to severe sincerity or to develop an anchor.

Option of homemade coal brushes to the Makita 2470

The process of manufacturing coal brushes to the Makita Peorator

Work begins with the preparatory stage. It is necessary to choose the right section of the harvesting of a coal rod. Here are the dimensions of the factory coal brush CB-419A in mm (6 × 9 × 12). The selected coal rods should be in the section of a larger or same size as the Makita peorators used in the peorators.

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If you have selected a more cross.Sectional blanks, they are sawn with files or with sandpaper. But you can use a fairly simple device.

A special device called “fungus” is clamped in the electric drill. This device has almost any master. It is used in the process of grinding surfaces.

The device is a Velcro circle, on which a grinding disk of the desired diameter is attached.

Try to securely fix the electric drill to the workbench or table. The drill can be fixed with clamps, clamps, or temporary device. Insert the fungus into the drill cartridge, fix the circle of sandpaper 00 on it.

Having turned on the drill, adjust the frequency of rotation of the cartridge. It is preferable to start grinding at small speeds. This will allow you to correctly control the grinding process.

Grinding coal nobleman from a battery

Constantly control the dimensions of coal brushes. The sizes of the cross section of the electric grinders are especially important. The brushes should enter the brush holder tightly, but move freely.

Homemade electric shocks

Find the right material, cut it in size with a margin of 2 mm. Then bring on the sandpaper to the desired size. As an upper contact on the wire, it is recommended to use the contacts of old brushes, soldering them to the contact wire if it is.

If there is no contact group, to fix the wire, a hole of smaller diameter is drilled in the electrode than the diameter of the copper braid. The braid is twisted, inserted into a drilled hole and grinned from the opposite side with a copper wire. Everything is ready, set and check for sparking.

Classification

As already mentioned, electric shows can be classified according to the material from which they are made. Graphite brush, as the name implies, is made of graphite into which soot and binding elements are added. This type of current coordination is most often used for crawls.

The coal brush is made of the same material, but without heat treatment. Such a product is abrupt much faster and for a corner grinder is practically not used

It is important not to be mistaken when purchasing brushes to replace. Coal brushes on a corner grinder will not last long

The metallographic brush is used in large industrial units, and it is unlikely that it will be possible to install it on an angular grinder. This is the most durable product that has a very high price. The variety of cord.Shaped is much larger, their shape, material and size are significantly vary, which is determined by the variety of use of such equipment. They can also be classified according to the material from which they are made. The most popular are brushes with a metal pile. Metallic rotor. Rather universal nozzle. For the manufacture of such products, both metals and alloys are used.

Steel roots are used to work on metal. Stainless steel brushes are best used along stainless steel or aluminum. Often steel pile is covered with brass, such brushes are not corroded. There are purely brass brushes. Despite the greater softness, they have a number of advantages: a relatively soft effect on the material, the absence of sparks when working at high speeds, the absence of scratches when processing the surface.

Wire for such brushes can be different. The twisted wire is usually the hardest, it can be collected by harnesses (they can be more gesture and can be self.Adjusted) or fixed randomly. With the help of such effective nozzles, you can remove the scale from welding or rust. The corrugated cordchit has a wave.Like curved pile and, unlike the previous type, affects the surface not so intense. With its help, you can clean the surface from the old paint.

Brushes with even pile are widely used, they are the most universal and can be used on any surface. Their effectiveness can be slightly lower than that of specialized nozzles. Polymer pile nozzles, for example, nylon, are used to polish various surfaces, including metal. You can successfully use them for wood work. To highlight the texture or final processing. Plastic brushes are often used to work with soft materials.

The cup is used to work with large surfaces. Its shape follows from the name. On such a brush, the clamping nut is most often fixed immediately, since a special key, provided for in the kit with an angular grinder, cannot be applied to it. The conical brush is used to work with concave surfaces. Radial, as a type of flat brushes, is used to process hard.To.Reach areas. The disk, the most common type of cord.Shaped, also has a flat shape and can be used to process the most diverse surfaces in the area.

And also the cord.Shafts are divided into dimensional groups. The diameter of the brushes is determined by the technical capabilities of the corner grinder and the area of ​​use of this nozzle. Brushes with a diameter of less than 115 mm are usually used to process small surfaces. A circle of more than 200 mm for a small corner grinder is better not to use, you will have to remove the protective casing, and this is a violation of all safety standards. Such large brushes are usually used to process overall structures and only with the help of large powerful craftsmen.

The most acceptable household purposes is the diameter of the brushes 125 mm. You can offer the fourth classification of corticacles. On the use of. The brand brush, the name is given from the name of the technical operation, which is carried out using this nozzle. Dyeing. Preparation of the surface for subsequent processing: removal of rust, paint, pollution. At some stages, this is the process of chemical exposure to the surface of the product, but the initial processing consists in mechanical surface cleaning. Metal (steel or brass coating) brush is used for mechanical painting. The task of such processing is the removal of scale, oil spots, minor defects, burrs and the like. Without dyeing, it is sometimes difficult to assess the quality of the weld, the bastard can hide some defects.

The main characteristics of the brushes

The basis of the brush is a circle with a hole in the center (diameter 22.2 mm). Outwardly, it resembles a cutting disk. The equipment is installed on the corner grinder also the same. To do this, the nozzle is put on a corner grinder on the spindle, after which it is tightened with a counter.

Brushes are released in different diameters (from 115 to 200 mm). The degree of stiffness of the bristle depends on the thickness of the wire. The nozzle option is selected taking into account these parameters so as not to damage the appearance of the working surface.

Equipment with thin wire is suitable for processing blanks of complex shape or soft structure. It is advisable to use thick bristles for stripping welds or burrs.

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The stiffness of the nozzle also depends on the type of material used for the manufacture of the brush, and the shape of the bristles. Each variety is designed to perform certain work.

When choosing a nozzle, you need to consider:

Rules for replacing brushes in grinder of different manufacturers

The wise master will not wait until the tool will give signs of breakdown. Since the replacement of the brushes is part of the maintenance of the corner grinder, it will regularly clean the collector about pollution and inspect these details.

It is worth remembering that manufacturers of brushes for corner grinders always indicate the minimum size in which the product still retains its performance. This indicator may vary slightly depending on the manufacturer.

Most of the tool models suggest two options for the location. In the first case, they can be inside the handle. In the second version, the brushes are placed on the case. However, regardless of the location of these details, in order to prevent prevention, it is worth disassembleing the tool and lubricating all its components.

Before starting the analysis of the corner grinder, you need to de.Energize it. Then it is required to disconnect the tips, inspect the holder. After extracting the brushes themselves, a thorough check is required for the presence of mechanical damage, which will indicate a wear that requires replacing the part.

Here are examples of repair work on the grinders of leading manufacturers:

Repair of Interskol models begins with the removal of the stator cover, after which it is necessary to unscrew the screws from the holder. The minimum residual length of the brushes on the mechanisms of this company cannot be less than 5 mm.

On Bosch grinders to remove brushes, just open the stator body handle. The device of this brand will not work with the length of the working brushes less than 8 mm.

Buying a corner grinder, you can find demanded spare parts in the starting kit. You can decide on them which brushes to choose.

Not for all types of corner grinding, it is easy to choose the right option even in a special store. In this case, it is required to purchase a larger brush to file them to the required.

Coal, graphite and metallographic brushes for angular grinder

In the manufacture of sequins of electric machines, the following materials are used:

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

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

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Fields of application: 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 angular grinder 9565c/9565cv/9565cvl. Photos all tools.RU

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

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

Firm coal obtained from amonia 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.

Areas of application: 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 application: 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.

It is used 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 mixing and sealing at high temperatures of graphite and silver powder.

It has 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.

Fields of application: tachogenerators, low voltage micromotors, measurement signals transmitters.

A brief analysis of the above classification of materials for brushes shows that in the engine of your corner grinding, a universal engine engine. The manufacturer could apply parts made of electrographs, carleographic, solid coal or baculitographic. 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.

Corner grinding nozzles. Types and features. Application

With proper use of an angular grinding machine, this device becomes a universal tool that is processing any material. In this case, the main factor is to choose the right nozzles for a corner grinder.

With the help of corner grinder, you can perform many different operations using different wheels and nozzles: to rip, sharpen, polish, and also perform other types of work where you can use the rotational movement of the tool.

Types of nozzles

There are many different devices and nozzles used when working with an angular grinding machine. Consider their main types, design features and application.

Cutting discs

These are the most common nozzles, which are produced by many types. With them, you can process any material. The discs for metal, stone, wood were popular of them.

  • Cutting disks for metal differ in diameter and thickness. In diameter in the retail network, you can find discs with a diameter of 115. 230 mm. The thickness of the discs ranges from 1 to 3.2 mm, depending on the diameter. These dimensions also depend on the speed of rotation and the load attached to them.
  • Stone processing discs differ from other species only by abrasive materials from which they are made. The remaining parameters are similar.
  • Wood wheels. The use of such discs is very dangerous, if you work inaccurate, you can get an injury. Such discs are essentially saws. It is forbidden to remove a protective casing from an angular grinder. It is better to use a disk for sawing wood with a small tooth, and do not use a large feed. The best use of such nozzle for angular grinding grounds is the use of special devices for inpatient fixation of the corner grinder.
  • The diamond disk is universal, since they can cut off any material. Such nozzles have gained great popularity in the cutting of tiles, stone, concrete and granite. For each material, you can choose your own disk. Some models have a cutting edge with slots, and other solid ones, as well as they come with small or large diamond spraying, depending on the purpose. For example, the discs for cutting stone are solid, and for cutting concrete with transverse slots and small spraying.
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In appearance, it is difficult to determine why the disk is intended for, so when buying it is necessary to familiarize yourself with the characteristics of the disk indicated on the packaging.

Polishing and grinding

There are many types of such circles. They can be cloth, spongy, felt and with a change of grinding.

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To work with them, it is necessary to use special pastes with small abrasive, as well as various liquids. Small amatery circles are used for stripping and rough grinding. The use of disks for grinding makes it possible to bring the surface of any material to the desired roughness. Such nozzles for corner grinder are used to polish the car body.

These discs can be divided into the following types:

The nozzles for corner grinders much increase the functionality of the grinding machine.

Corner grinder is widely used in construction and many other areas. And together with various nozzles, they become universal equipment.

Wood for grinding nozzles

A grinding machine can be used to polish a wooden surface, tree clippings. For this, special types of nozzles are used for certain types of work. Before starting surface processing, it must be marked.

After grinding, circles from the disk remain on the surface. This is noticeable after covering the surface with varnish or paint. This is the peculiarity of the work of the corner grinding. Therefore, it is necessary to follow the surface with a manual sandpaper on the surface. You need to work on wood with a corner grinder carefully, without making great efforts, do not use thin circles, correctly perform their fastening.

To make the right choice of nozzle for corner grinding, consider their specifics and different modifications.

Druming devices

This category includes two types of nozzles.

A hard drive can completely replace a manual rubbish

To perform gross processing of logs during the construction of a house, processing pillars for fencing, such a nozzle will be an indispensable assistant.

The features of its use are:

  • It is allowed to use only with a grinding machine equipped with a second additional handle. For safety reasons, the corner grinder must only be held with two hands.
  • It is allowed to remove the protective casing, since the body of the nozzle is whole, and the probability of its destruction is very small. However, protection against flying chips is required: mittens, glasses, clothes.

The peeling disk is designed to remove wood bark and rough processing of the workpiece

In the presence of certain skills in the wood array, such a disk can be selected. When erecting a log house from logs, a grinding machine with a roller nozzle is a good alternative to an ordinary ax.

You can also cut the board with a pender disk, but the cut width will be large, and more sawdust will form.

Frezing nozzles

There are two types of such nozzles: discs and mills.

Discs are made of different performance. Their difference is the size of the granularity of abrasive material

Such abrasive discs are similar to the structure of the surface of the manual rashpil, with a honors in the speed of processing. In the presence of dexterity and acquired skills, such discs are used for finishing wood processing.

Features of the use of cutters:

  • It is forbidden to remove the protective casing when working with the cutter.
  • It is allowed to use the cutter only for the work specified in the instructions for it, with the recommended rotation speed, and other instructions.

Types of brushes for corner grinders

They are used directly to work with materials of any composition and strength. Their choice is diverse, and each is different in its properties.

  • Cut.Off. Have an effective cutting part. The perfect choice for sawing metal made of metal.
  • Saw. Used for work with wood. Convenient and easy to use.
  • Rittle. Perfectly remove the old layer of paint coatings. Suitable for grinding wooden and metal coatings.
  • Certificate. This type of nozzle is used before painting pipes. Designed to clean up rusty deposits. Often applied by locksmiths in activities.

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Replacing brushes

For the proper operation of the tool, an accurate setting of the brush unit is important, including a clamping device, a contact group and a guide profile. For low.Class power tools, non.Contact brush holders are sometimes used. With improper adjustment of the brush, the collector, as well as the brush node, can overheat, leading to a malfunction of the anchor.

Manufactured by the manufacturer, these parts are often characterized by a short service life. In this regard, many professional tools are equipped with an access valve. This technology allows you to change the details without much difficulty. However, such graphite brushes are suitable only to models to which they were intended. In the case of emergency repair, some masters extract these parts from the working device and rearrange it on non.Working, adjusting the dimensions using a file. This method for wide use is not suitable and is unlikely to give a good result when operating the product. The main sign that the resource of these parts is coming to an end. A bright glow through the case. The grinder mechanism is cooled, passing through itself the air along with the particles of the abrasive, which gradually destroys the material of the brushes.

To replace you will need to perform the following actions:

  • Up the cap cover of the compartment, remove everything that remains of these parts. The anchor and other parts of the power tool, most likely, is not required to disassemble. Coal brushes are fixed in spring.Loaded brushes or in brass glasses. So that the springs do not rest on the walls of the collector during the repair, special pins for parking are provided.
  • Remove the brushes with the holder. The process of deformation can be reflected unevenly: production depends on the position of parts in relation to the jet of the air-abrasive mixture.
  • Using a caliper, measure the extracted parts and compare their size with new spare parts. If necessary, larger brushes can be finalized with sandpaper (granularity 150), as well as a flat suprafil.
  • Compare the output position of the contact wires. If spare parts are not suitable, additional cutting out the wiring grooves may be required.
  • Install the spare part and attach the wires to the corresponding terminals. If necessary, you can use old wires by soldering them to new products.

After installation, check the work of the tool: new parts should not spark, and the work sound should be even, without sharp differences.

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