How to insert brushes into a corner grinder. And get the calculation today

Grinding Fiolent at what length of the brush to change

Very often, the manufacturer of corner grinding machines compels its products with a spare pair of brushes (graphite contacts that allow transmitting an electric current to a rotating rotor).

Does this detail wear so intensively that it is only provided for adding? If you use the tool from case to case, then the brushes will survive the owner himself. But if you operate the corner grinder daily, then, indeed, their wear will be significant. And the day will come when a slightly centimeter graphite rod is wiped to a thin plate. It is impossible to allow the maximum wear of brushes so as not to damage the rotor contacts. Check the condition of the rods periodically, after developing in tens of hours.

Option 1. Quick access system for brushes.

This option is the simplest. But it can only be implemented in those grinders that are equipped with special brush compartments of fast access. Usually they are on the side of the tool. To replace the brush, you just need to twist the compartment cover, pull out the old worn brush, but install a new one in its place. Everything is very simple. And such a procedure takes only a couple of minutes. The main thing is that the brushes suit the model of corner grinder.

If the manufacturer has not equipped the tool with a rapid replacement system, to implement this procedure, an angular grinder will have to be disassembled. First you need to familiarize yourself with the instructions for the tool and its scheme, if they are included. Usually the corner of the corner grinder consists of two parts fastened to each other. After the case is disassembled, the old brush must be dismantled from the brush holder and install a new one in its place. Make sure that the brush holder reliably presses the brush to the collector. Try to use only original brushes suitable for your specific tool model. However, if you do not have the opportunity to purchase one, and you could not find an analogue. you can fit the brush to the size you need. It is done quite simply. with a small file. When fitting, take your time, comb the brush carefully. The main thing is that it ultimately does not turn out to be smaller than the original.

Separately, it should be noted that the replacement of the brushes with a corner grinding is a procedure for a completely simple. However, when going to conduct it, be sure to make sure that your corner grinder is no longer on a warranty period. Simply put, usually manufacturers are against any unauthorized implementation in their products. For such maintenance there are special service centers. If you violate the warranty agreement, introducing into the tool, then the manufacturer eventually simply refuses free service or the replacement of the tool. In short, cases are different. After all, each manufacturer has its own rules, therefore, before disassemble the corner grinder, we recommend carefully read the guarantee coupon of the tool.

What is made of

Brushes for corner grinding and other power tools are made of 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.

It is interesting!The design of the brushes contains a ceramic tip, which performs one of the important tasks. When abrasion of the graphite layer to the limit, the tip begins to contact with the copper lamps of the collector. Ceramics does not conduct an electric current, so the corner grinder when the brushes is abrasion will work with interruptions or will not turn on until the devices are replaced.

Why brushes burn on the corner grinder

In addition to sparking, often the owners of the power tool are faced with the fact that the brushes on the corner grinder are burning. This phenomenon differs from sparking in that the rapid wear of the main part of the element occurs. Immediately after the installation of new elements, they are worn out immediately with the first use of the power tool. It is necessary to figure out why brushes on a corner grinder are burning.

The main reason is not hidden in the brushes themselves, but in the collector. If lamellas fall on the collectors or abrasion, then this leads to an increase in the load. This load is experienced by graphite elements, which, when the angular grinder is turned on, begin to wear out quickly. this process of accelerated wear is called combustion. Elements literally burn due to a large current passage. Many call this process abrasion, but in reality the brush can quickly erase from mechanical exposure. The cause of combustion is severe sparking, as a result of which graphite is literally burning.

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The reasons why the brushes on the corner grinder burn are as follows:

    LASTING or wear of the Copper Lambels of the collector. What the wear of the collector lamella looks like, shown in the video. The material also shows how to try to eliminate such a malfunction

There is also such a thing as a circular fire. This phenomenon arises with large shocks of the anchor current, for example, during overloads, short circuits, as well as with a decrease in the network voltage. Circular fire manifests itself with re.ignition of the arc. Increasing the load and even short circuit occurs when using a corner grinder for sawing wood. When processing wood, a cutting of the cutting disk occurs, thereby the current increases 15-25 times from the value. Most often, the causes of combustion of elements are a collector, so if you have to change 2-3 pairs of brushes in a month, then it is time to diagnose the power tool.

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.

glass disc grinder

How to replace brushes in a power tool

There is nothing eternal in our imperfect world. and as an evil of this capital truth, I wanted to confirm while I worked as a corner grinding: through the case in the area of ​​the location of the brushes a bright glow began to break through. this means the resource of these same brushes has come to an end and, accordingly. they need to replace them.

The scurry of the Abrall happened at the end of the work and there was no need to urgently seek a replacement for the failed tool.

Still, the works associated with the cutting of various types of stone, facing tiles, concrete and the like made itself felt: and even the venerable Dewalt could not stand it and three years-no matter how you protect the tool, and air with the particles of the abrasive passes as a cooler through the insides of the grinder. and since the pressed graphite from which the brushes are made, the material is quite soft. from “eats” first of all. I reassured myself that brushes are almost a consumable and replacement of them, well, no matter how it will hit a The grief came when, having smoked the Internet for about an hour, I found the brushes I needed only in one store in Odessa, and even then, calling the next morning at this store, the consultant finished me down, saying that there was no product I required in the warehouse and will not be at least until until next year for sure.

Realizing that there was no way out, and the working corner grinder is needed tomorrow, it was decided to “insert your hands” and show Russian ingenuity.

To begin with, I had to disassemble the corner grinding and extract what was left of the brushes for inspection and obtaining conclusions. By the way, Dewalt has a very thought.out case: the compartment of the brushes and the buttons (by the way. the dust protected) stands a mansion and unscrewing the 4 screws only the compartment itself is revealed, and the anchor and everything else is in its own case. Brushes are fixed in spring.loaded brushes; and not in brass glasses, like the best samples of Chinaprom. In order to prevent the spring from resting during the repair or maintenance in the collector’s lamella. parking pins are provided (the photo can be seen).

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I remove the brushes directly with the holders: inside one you can see the hole and the spring in it-something tells me this kind of wear alarmist. The spring on the friction of the collector gives a sheaf of sparks thereby the need to replace the brushes themselves. By the way, I did not find any defects from this signaling mechanism. Another brush is slightly widespread-such an uneven production is due to the position of brushes relative to the jet of the air-abrasive mixture of the flying out of the working area.

How to Replace the Brushes on a DeWalt D28402 GrinderA Quick Fix

I pull out the brushes from the holders, measure it with a caliper and I look in the treasured box with various details of the brush at least remotely acceptable in size. These were found quite quickly. The difference was only in size (naturally in the most way) and in the location of the release of the contact wire.

The necessary size was obtained by finishing the donor with a flat suprafil and sandpaper with a grain of about 150, also the originals on the bottom part had a small sample that was washed down by the same file. By constant examples between the massacre according to the graphite, I achieved an excellent planting of donor brushes in holders; In order to make the contact wire out of that place to completely sit in the nest. the groove was cut into which the wiring was cut out with a round suprafil.

Well, the brushes are inserted into the holders, and the brush holders are installed in their places: now it is necessary to somehow join the wires leaving the brushes to the corresponding terminals. Frankly: I didn’t come up with anything better and cutting off the wires from the old brushes sold them with the wires of the new ones. yes, I agree it not right. the solder in this place is not very good, but I didn’t have any options: the wires as you can see are short.lived and will get out everywhere and get out In a different way, it did not work. Yes, and I tuned it efficiently and plunged it to my conscience. in general: it will not come off. good; will tear off. then we will think. The main thing is that after assembly Dewalt earned. I did not observe any sparkles from under the new brushes, the sound of the instrument was even and without complaints, and tomorrow new brushes will be running in the cutting of metal.

Thank you for your attention!

Tags: repair of corner grinders, extract brushes, corner grinder Makita

Interesting, and when there are already posts about how to unscrew the bulb from the cartridge if it crashes for example.

You take the pliers and even with side cutters you can. you pour nafig and twist.:)

Pill the threaded thread.And they just unscrew the finger with a pillow.but lick when you unscrew them on dry.

I have already changed a lot of brushes :). you can any other penetrating grease.just the form of forms is convenient.If I do not confuse there at all, the shooting ones are worth it, and until it shoots it makes no sense to change.

These goals are unscrewed with a special bundle and, if my memory does not change me, then the key is suitable for a small corner grinder, which is clamped by circles (cutting, food).

These goals are unscrewed with a special bundle and, if my memory does not change me, then the key is suitable for a small corner grinder, which is clamped by circles (cutting, food).

Yeah, there is such a key :)) But such a huge corner grinder has not yet been invented :))) probably on F 1000 mm. Circle if current 🙂

insert, brushes, corner, grinder

damn it, it would be better to sell as broken on Avito for 500 r. :)))

Well, don’t tell me, I already bought such a makar 2 pea dh24pc3.one.th in a box for 500300 r. Ship, with a barrel of 1200 r. and replaced himself = 2000 r.2-oh in a box for 800300 r sends, from the words of the seller sparkled in brushes. Blowing, cleaned. all the norms 🙂 = 1100 r.The brushes are still 70% left

This is good for the one who buys cheaply on Avito.

Well, don’t tell me, I already bought such a makar 2 pea dh24pc3.one.th in a box for 500300 r. Ship, with a barrel of 1200 r. and replaced himself = 2000 r.2-oh in a box for 800300 r sends, from the words of the seller sparkled in brushes. Blowing, cleaned. all the norms 🙂 = 1100 r.The brushes are still 70% left

Why brushes burn on the corner grinder

In addition to sparking, often the owners of the power tool are faced with the fact that the brushes on the corner grinder are burning. This phenomenon differs from sparking in that the rapid wear of the main part of the element occurs. Immediately after the installation of new elements, they are worn out immediately with the first use of the power tool. It is necessary to figure out why brushes on a corner grinder are burning.

The main reason is not hidden in the brushes themselves, but in the collector. If lamellas fall on the collectors or abrasion, then this leads to an increase in the load. This load is experienced by graphite elements, which, when the angular grinder is turned on, begin to wear out quickly. this process of accelerated wear is called combustion. Elements literally burn due to a large current passage. Many call this process abrasion, but in reality the brush can quickly erase from mechanical exposure. The cause of combustion is severe sparking, as a result of which graphite is literally burning.

See also  How to unscrew the angle grinder without a key

The reasons why the brushes on the corner grinder burn are as follows:

  • LASTING or wear of the Copper Lambels of the collector. What the wear of the collector lamella looks like, shown in the video. The material also shows how to try to eliminate such a malfunction
  • Interpretation close between lamellas or winding windings contributes to an increase in current from which the brushes heat up and begin to burn. To identify the cause, you will need to call the anchor
  • With strong overload of the power tool-if we operate the corner grinder for a long time without breaks, then the result of this application will manifest itself in the form of combustion of brushes in 5-10 seconds

There is also such a thing as a circular fire. This phenomenon arises with large shocks of the anchor current, for example, during overloads, short circuits, as well as with a decrease in the network voltage. Circular fire manifests itself with re.ignition of the arc. Increasing the load and even short circuit occurs when using a corner grinder for sawing wood. When processing wood, a cutting of the cutting disk occurs, thereby the current increases 15-25 times from the value. Most often, the causes of combustion of elements are a collector, so if you have to change 2-3 pairs of brushes in a month, then it is time to diagnose the power tool.

Prevention and maintenance

If you had to repair the corner grinder with your own hands, then after such an action you will definitely treat the tool more carefully and more carefully. After all, the service life of these units directly depends on how the owner takes care of them. Any tool needs care, and not only electric. Even if you leave a simple wrench in the yard in the open air, then a month later signs of rust will appear on it. The same with the power tool as corner grinders, they not only need to be stored correctly, but also regularly maintained.

So that the corner grinder does not need to independently repair, it is necessary to periodically process it with lubricants, as mentioned above. To extend the service life of the unit, the following preventive measures are required:

  • Depending on the purpose of the unit (household or professional), to operate it according to the recommendations of the manufacturer, which will exclude the need to repair the corner grinding of a do.it.yourself corner in the near future
  • Do not overload and prevent overheating
  • Regularly disassemble the case and clean the internal parts, blow them and replace grease
  • At the first signs of malfunctions, resort to repairs. You can not work with a device if you know that the mechanism is defective in it. This can not only entail a complete breakdown of the unit, but also cause dangerous consequences for the master working as a tool
  • Timely perform the replacement of consumables, parts and nodes
  • Do not work as a tool in which the button is faulty
  • If you work with an unit with a wooden process of wood, you need to be careful and very careful. The most dangerous with such actions is the return when touching the disk to the processed part. You can’t cut trees with a corner grinder, since it is not intended for this
  • In the process of work, keep the tool with only two hands, for which the design has a special adjustable handle
  • Use the tool only with an installed cover. Without a cover, to work strictly contraindicated by the device. There are many videos on the Internet about the consequences of incorrect operation of a corner grinder that you can see to understand why you need to comply with safety requirements. The cover on the grinder is mobile, therefore, depending on the type of work performed, it should be correctly placed

It is necessary to store the tool in a ventilated or ventilated garage, but not in the observation pit where the condensate accumulates. Adhering to all the recommendations, it will not be difficult to repair the corner grinder, since the need for its repair will disappear with itself. Below watch a short and useful video on how to work properly a corner grinder. This video will be useful for those who are tired of carrying out the repair of corner grinders with their own hands, the need for which depends on the correct operation of the tool. Do not forget about this when you load your tool to the limit.

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