Metal brush for angle grinder
The bristles of a roughing brush are of several types: from straight, twisted, or corrugated wire.
Twisted wire affects the surface harder than others and has the greatest resource. it retains the shape of the brush longer, breaks less. The twisted wire in the process of work gradually unwinds freeing the bristles for work.
Further, according to the degree of rigidity, the corrugated bristle form follows, which has less abrasive properties than twisted wire. Features of such brushes: soft effect on metal due to the springing properties of corrugated wire and less vibration of the tool during operation.
Rough brush diameter
The smaller the diameter of the disc, conical or bowl roughing brush, the less the tool motor is loaded and less vibration is transmitted.
The larger diameter of the brush allows for a shorter working time: make fewer passes for cleaning a specific element.
The pile of the peeling brush can be: steel, copper-plated, brass, abrasive, nylon.
The hardest, and as a result, the strongest effect on the surface is steel pile.
Rough brushes with abrasive and nylon bristles are considered the softest. Suitable for removing paints and rust without thinning the metal and without a consequent reduction in the corrosion resistance of the material.
Brushes with copper-plated and brass bristles are located in the middle in terms of hardness, relative to steel and nylon. In the process of working with such brushes, the removal of the old layer of material is accompanied by the transfer of the brush material to the surface, while a thinnest protective layer is formed on it, which prevents oxidation.
The thickness of the wire of the brush pile is also important. As a rule, steel brushes have a much thicker wire than brass and copper-plated brushes.
How to choose a roughing brush
Rough brushes are used to remove old paint, rust and welding scale from surfaces, sand plastic parts, treat wood surfaces to emphasize the structure of wood, and even for preparatory finishing work, such as cleaning materials from bricks and concrete.
We will figure out what kind of brushes are in shape and material, what kind of power tool you can work with and how to choose a brush for solving a specific task.
Abrasive brushes, brushes, cord brushes, carts, brushes, brush brushes and brushing brushes are all used to refer to rough brushes.
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The first thing they are guided by when choosing a cord brush is where it will be used.
A hard bristle of a peeling brush is required for working with hard materials: old or mechanically resistant paints and enamels, welding scale, high density finishing materials. But there are many tasks that require a more delicate approach and different softness of the brush pile material.
Disc brushes are used to process joints and joints in hard-to-reach places. grooves, niches and corners.
Cups (bowl brushes) are best used on large, flat surfaces. For greater durability, manufacturers sometimes use a reinforcing ring in the design, which retains the shape of the roughing brush bristles longer.
Conical brushes are used for working both on flat surfaces and for processing edges and grooves.
All these types of brushes are designed to work with an angle grinder (angle grinder), they have a bore size of 22.2 mm or a threaded fastener M14.
For sharpening machines, round brushes are used, which have a special landing size of 20 mm or 32 mm.
For brush grinders, cylindrical roughing brushes are designed: for uniform processing of large surfaces.
Grinding brushes for drills are both disc and in the form of cups and brushes, they have a cylindrical shank of 6 mm.
To equip straight grinders, miniature roughing brushes of disc and brush shapes are used, with a cylindrical shank of 3.2 mm.
Steel wire roughing brushes are suitable for a variety of surfaces, mainly metals.
Twisted wire brushes are extra hard for the toughest jobs.
Corrugated steel wire brushes for delicate surfaces.
Stainless steel wire brushes are best for working with stainless steel and aluminum.
Brass or copper roughing brushes suitable for soft materials such as bronze and copper.
Brushes with abrasive bristles are designed for finishing, roughing, preparation for subsequent gluing, picking out soft wood fibers. brushing.
Features of brushes
If we talk about electric brushes, then first you need to clarify the name. This device was called brushes even in the early days of its existence (the beginning of the 20th century), when, in fact, 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, despite its 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 prolonged use of any power tool. It is very simple to identify the wear of the brushes: a previously reliable unit will begin to work intermittently, a 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 abrasion.
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, acquiring increased wear resistance. The coal option is the cheapest, since it does not involve heat treatment. These brushes are the least durable. Metallographite brushes are the most expensive because, in addition to carbon, they contain metal powder. This is the most durable option, which can be found very rarely in household appliances. As already mentioned, also called a brush is a detachable attachment for an angle grinder.
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 discs or grinding discs or brushes with various kinds of nap, fixed in a circle. Such a removable device is called a cord brush or, even shorter, a cord brush. Brushes, as well as disks for UMSh, are consumables. In the process of work, they wear out and must be replaced. Brushes for an angle grinder are designed in such a way that they are installed on a rod thanks to a hole in the center, this is their main difference from brushes for a drill, which have a shank for installing them in a drill chuck.
The pile of the brush, depending on the specifics of its application, can be steel, brass, polymer fibers and even wool.
What are we 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 cord brushes need to be said in more detail. They are used for the machining of various materials. Different types of these nozzles are used for cleaning before painting or applying primer, 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.
How to choose?
If you have decided on the size and type of brush, you should pay attention to its quality. The wire iron brush should have a uniformly distributed pile, individual villi should not be longer or shorter, this factor can cause poor-quality surface treatment and excessive vibration, therefore, stress not only on the parts of the angle grinder, but also on the hands of the person who will perform work.
Excessive vibration of the machine during operation is the main reason for the high stress on the muscles of the arms. With a small diameter brush, vibration is always less. A polymer brush is the lightest type of cord brushes, and the vibration with it is the smallest, but not every surface can be processed with such a nozzle. A polymer-abrasive brush is used for brushing (aging) wood, and you should not try to process metal with it.
Classification of brushes for an angle grinder and features of their selection
- Features of brushes
- What are we for?
- How to choose?
- Subtleties of operation
Brushes are called both current collectors inside an angle grinder. a necessary element of an electric motor, without which an angle grinder, like any other electric tool, cannot work, and removable nozzles, which allow cleaning, grinding and even polishing various surfaces with this tool. In this article we will try to deal with those and other brushes.
As already mentioned, electric brushes can be classified by the material from which they are made. A graphite brush, as the name suggests, is made from graphite, to which soot and bonding elements are added. This type of slip ring 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 an angle grinder. It is important not to make a mistake when purchasing replacement brushes. Carbon brushes on an angle grinder will not last long.
The metallographite brush is used in large industrial units, and it is unlikely that it will be possible to install it on an angle grinder. It is the most durable product with a very high price tag. 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 are brushes with metal bristles. The metal brush is a fairly versatile attachment. 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 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, no sparks when working at high speeds, no scratches during surface treatment.
The wire for such brushes can be different. Twisted wire is usually the most rigid, it can be bundled (they are more rigid and can self-sharpen) or fixed randomly. These efficient attachments can be used to scrape off welding scale or rust. The corrugated cord brush has a wave-like curved pile and, unlike the previous type, does not affect the surface as intensely. With its help, you can clean the surface from old paint.
Even brushes are widely used, they are the most versatile and can be used on any surface. Their efficiency may be slightly lower than that of specialized attachments. Nozzles with polymer bristles, such as nylon, are used for polishing various surfaces, including metal. They can be successfully used for woodwork. for texture selection or finishing. Plastic brushes are often used on soft materials.
Brushes can be divided according to their shape.
The cup is used for working with large surfaces. Its form follows from the name. A clamping nut is most often immediately attached to such a brush, since the special key provided with the angle grinder cannot be applied to it. The conical brush is used for working with concave surfaces. Radial, as a kind of flat brushes, is used to process hard-to-reach areas. Disk, the most common type of cord brushes, also has a flat shape and can be used to process a wide variety of small surfaces.
And more cord brushes are divided into size groups. The diameter of the brushes is determined by the technical capabilities of the angle grinder and the scope of application of this attachment. Brushes with a diameter of less than 115 mm are usually used for 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 UMSh.
The most acceptable for domestic purposes is the diameter of the brushes 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 that is carried out using this nozzle. Brushing. preparation of the surface for subsequent processing: removal of rust, paint, dirt. At some stages, this is a process of chemical action on the surface of the product, but the initial treatment consists in mechanical cleaning of the surface. For mechanical brushing, metal (steel or brass-coated) brushes are used. The task of such processing is to remove scale, oil stains, small defects, burrs, and the like. It is sometimes difficult to assess the quality of the weld without brushing, the adhering scale can hide some defects.
For processing soft materials (plastic or wood), nylon, rope (sisal) and hair scrubbing brushes are used. Such brushes must be moistened with special emulsions (vegetable oil can be used for wood), otherwise the surface will turn out dull.
Subtleties of operation
Installing or changing a cord brush for an angle grinder is no more difficult than doing it with a cut-off wheel. You need to fasten it with a nut, and the same standard open-end wrench with pins is used to tighten and unscrew it. Some cup and cone brushes come with a nut. Replacing such a nozzle is even easier, just screw it onto the pin. Working with a cord brush does not imply strong pressure in the direction of the surface to be treated, this can cause the appearance of furrows, which will be a sign of poor-quality, unprofessional processing.
Operation without a protective cover is inadmissible. Safety goggles or a mask are required to protect the eyes from splinters of wire cord, shavings or flying pieces of old paint and metal scale. The high speed of rotation of the brush can give the shards a completely unpredictable trajectory, so the eye protection must fit snugly against the face. It is also advisable to protect hands from sparks and chips, small metal splinters or cuts with large chips and sharp edges of scale are possible.
Any operations with the preparation of the angle grinder for work (replacement of the cord brush, cutting wheel, adjusting the position of the protective cover, cleaning) must be performed after disconnecting from the power supply.
Brush for angle grinder Piranha 100mm polymer-abrasive
125mm nylon polymer abrasive brush for Yato YT-47787 angle grinder
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Disc wire brush 125mm for angle grinder Intertool BT-7125
Wire disc brush 180mm for Intertool BT-7180 angle grinder
How to choose a quality brush?
When choosing a brush for an angle grinder, 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 cup. It is unacceptable when the bristles are thick on one edge and thin on the other. Such a brush will hit the hand (vibrate), cleaning will be performed unevenly, and the brush itself will fail very soon.
Among the parameters for the wire nozzle, manufacturers indicate the recommended revolutions for the machine. This indicator should not be ignored. If you put the 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 developed for operation at high speeds, at low speeds will not work with the proper performance.
The smaller the diameter of the cup, the less load on the machine motor, less vibration, and, accordingly, less hand fatigue. But the larger the diameter of the cup, the fewer passages are obtained. Which brush should you choose? There is no definite answer here. Sometimes the craftsmen have time to try several brushes of different diameters and different bristle stiffness before they find the best option. The choice of the brush often depends on the quality of the paintwork. After all, as you know, different enamels and primers have different coating density.
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What kind of tool is an angle grinder?
an angle grinder or an angle grinder is a universal and necessary tool on the farm. This tool is used by painters, locksmiths, and is in the arsenal of carpenters. Its importance varies depending on the attachments used. Put a circular disc on the machine. and you can cut wood. often, an angle grinder is used in plumbing for cutting metal: pipes, fittings.
But its main purpose remains grinding work. With the increase in secondary sales of cars, the demand for car repairs and painting is growing. The most difficult stage in this work is preparatory, that is, cleaning the surfaces of cars from old paint and primer. The cleaner the body is before the new priming, the better the new paint will hold. An angle grinder with a set of grinding brushes plays a leading role in this work.
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 etching process. This work can be done manually or with power tools. The brushes for the angle grinder themselves are called brushes. With this treatment, the porosity of the galvanic deposit decreases, it becomes denser. The surface to be treated is more uniform.
Brushing of steel surfaces is performed with steel brushes with a wire diameter of 0.2–0.4 mm. Non-ferrous metals are treated with copper or brass wire brushes. Electroplated coatings are also brushed in order to increase the density of the coating and give it a shine.
Brushing is performed 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 an abrasive.
Surprises from the brush. Advantages and disadvantages of working with her
Metal brushes for angle grinders are amazing with their variety. Their main purpose is to remove old paint and corrosion from metal. However, there are also hand brushes with wire bristles for small amounts of work.
Need for invention is cunning. User tip
The creative thinking of our people knows no boundaries. This recommendation, aimed at improving the performance of the brushes, was found on the forums of masters.
Everyone knows that the bristles of a grinding attachment wear off over time, and this rate of wear 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 one, which allows you to extend the life of the brush by a little, by 15 percent. This can be achieved by cutting off the top edge of the outer brush cup by 5-7 mm.
How to call them correctly?
On the net and on labels, there is a discrepancy in the name of the attachments. Some call them angle grinders, others call them cord brushes. How can we really call them? Cord is translated from English as string, cord, rope. And if you look closely, these attachments 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 the corset, obviously, took the name of the attachment by ear, and since the letter “d” is most often swallowed when pronouncing, so they began to write. I don’t know about spelling dictionaries, but the Word program in which this article is written recognized the spelling cord-brush as correct. with a hyphen.
What are the brushes?
Metal, bowl-shaped corsets appeared relatively recently. And before that, grinders worked mainly with different types of sandpaper or sanding stone discs. Paper, no matter how high their rigidity, quickly clogged with paint particles or was erased. It often had to be changed, which reduced work productivity. Working with a metal brush for an angle grinder is much more efficient in this regard.
Virtually every leading tool manufacturer has seen the need to bring their brushes onto the market. And each manufacturer has its own approach, its own exclusive in the development and manufacture of metal attachments for an angle grinder. Some worms are made from a single thin wire, others from a twisted cable, and others from a corrugated corrugated wire. Wire cord brushes differ in diameter, stiffness, bristle quality. Brush sets as attachments for an angle grinder are:
Metal brushes are made from:
- brass plated steel;
There are polishing brushes for metal surfaces and woodworking. They are made from nylon and other polymers, dried seaweed, cotton fibers.
The rigidity of processing depends on the structure of the wire, its hardness and thickness. The thinner the wire used in the manufacture of the brace, the softer it acts on the metal. To clean the surface of the old paint at the initial stage, it is better to use a nozzle with a stiff bristle, and for the final cleaning of the remnants of the primer and other materials, a nozzle with a lower rigidity is suitable, which will not “eat” the bare metal.
Wire is used for the manufacture of corsets:
- Corrugated. This brush, due to its springy properties, softens, on the one hand, the impact on the metal, and on the other hand, reduces the vibration of the machine.
- Twisted. The twisted bristles provide rigidity to the surface, break less and fly out as they wear out. Twisted fragments unwind, freeing the bristles to work.
Brushes differ in the diameter of the cup, which determines the parameters of the simultaneously processed surface. Angle grinder braces are consumables, but manufacturers are concerned about making them as efficient as possible and extending their lifespan.
In the process of surface treatment, be it metal or wood, safety precautions must be followed. The fact is that the higher the rotational speed of the disc on an angle grinder, the faster the corset wears out. Metal bristles fly off from it, scale grains and metal burrs also fly off from the treated surface. It happens that the cup does not withstand the load, and the brush itself scatters.
And all this literally shoots at the working person. Therefore, when working with such a brush, you need to have glasses, a respirator, gloves and, preferably, a tight overalls. Even if the sun is shining outside and the heat is unbearable.
The loud sound of the angle grinder is tiring, makes the worker irritable, so it is recommended that you also have earphones. Some workers combine useful with pleasant and muffle the sound of their grinder with their favorite music, inserting headphones from a player or phone into their ears.