Grinder attachment for sanding wood: types and application, selection of attachment

What you need to pay attention to when choosing an attachment for an angle grinder

When choosing a grinding disc, you need to take into account the power and size of the grinder. For devices of different sizes, circles are selected that are designed for a certain rotation speed. The main rule when choosing attachments for an angle grinder is that the wheel for sanding wood must have a certain thickness; the use of wheels of small thickness is not allowed.

What parameters are decisive when choosing a disk:

1. External diameter. The larger the size, the higher the processing speed and the longer the service life.
2. Landing diameter. To attach a larger circle, use a special adapter for an angle grinder, which has a mounting hole of the required size.
3. Disc thickness. The larger it is, the longer the nozzle will last.
4. Grain. The size of the fractions is selected in accordance with the type of processing.

When working with an angle grinder, you must take precautions; inept and improper handling of the tool can lead to injury. High rotation speed and heavy load on the device can cause the disc to break into pieces, which can injure a person. Before work, you need to check the correct position of the circle and the strength of its fastening. All movements of the grinder should be made smoothly and softly without vibration.

Conclusion

Thanks to the large number of woodworking attachments available, the drill is one of the most functional tools. It especially makes sense to use all kinds of tips in cases where the need to process wooden parts arises only from time to time. Of course, for frequent and especially professional work, it is necessary to purchase separate tools.

You can get some additional information on the topic discussed above from the video in this article.

The use of special devices clamped in the chuck of this power tool makes it truly multifunctional. For example, you can even cut sheet iron with it. Considering the variety of drill attachments for woodworking, it is unrealistic to go into detail about each of them in one article. We will deal only with attachments that allow using a drill to perform high-quality and quick surface mechanical processing of wood.

What is it? Preliminary cleaning of the surface (rough), removal of burrs, grinding and bringing to a mirror shine (polishing). All other technological operations with wood - milling, drilling, screwing in fasteners, cutting - do not belong to the concept of “processing”. This is what the author proceeds from. The difference in the listed types of work in relation to attachments is in the rotation speed of the drill chuck and the type of device. Which one to choose is decided mainly based on the required degree of processing of the tree and its species (that is, the density of the structure).

Types of attachments for an angle grinder

The processing of a wooden house takes place in stages: first, rough surface treatment is carried out, then finishing, and at the final stage, finishing sanding is performed. Accordingly, the nozzles presented on the market today are divided into varieties that differ in purpose, shape and material of manufacture.

Coarse attachments

There are several types of attachments used for roughing wood. Their main purpose is to remove large inclusions, bark and knots from the wood surface.

1. Grinding wheels structurally consist of a disk with soldered metal wires. The steel bristles can be positioned parallel or perpendicular to the tool. The wheels do an excellent job not only with rough processing, but also with peeling off old paint or varnish.
2. Cord brushes are a disk with metal fibers, horizontal. An abrasive brush is suitable for rough sanding and surface leveling.
3. End discs are used for processing bevel cuts and leveling the ends of logs.
4. Metal brushes consist of bristles made of stiff wire, which are positioned perpendicular to the tool. Used for initial treatment and removal of old paintwork.

Attachments for gentle grinding and polishing

1. Flap attachments for angle grinders are the most common. They consist of many trapezoidal blades of abrasive material that overlap each other. Thanks to this design, the nozzle wears out slowly. Depending on the degree of processing, you can choose discs with different grain sizes.
2. Grinding wheels are made from sandpaper, felt, sponge, thick fabric and are usually sold in a set. The discs are equipped with Velcro, with which they are secured to the plate attachment. The wood sanding set consists of five wheels made of the same material. They are very convenient to use; the worn disk is easily removed from the main nozzle, and another abrasive is placed in its place. Velcro wheels are used for fine and finishing sanding. You can polish wood with soft fabric and felt discs by applying a special wax-based polishing paste to the surface.
3. The cup attachments are a nylon brush consisting of many bristles of abrasive nylon. Used for fine sanding of wood.

Manufacturers

The Russian market for nylon abrasive brushes is increasingly being conquered by Chinese manufacturers . In addition to the reasonable price, the Chinese are working to improve the quality of brushes. Some models are practically not inferior to polymer abrasive attachments from European companies. Among them are the German “Osborne”, “Lessman”, “MATRIX”, “DEXX”, “STAYER MASTER”, the Dutch “DREMEL”, the Italian “Sit”.

Russian (St. Petersburg), "Abazhur" (Kemerovo) produce a limited range of nylon brushes . In the product catalog of a large Russian (Voronezh) only brushes with steel bristles are presented.

However, Russian enterprises are developing their own production and offering their products to the market. In the next video, the author tests a new polymer abrasive brush made by. As examples for comparison, two Chinese brushes and “Noname”, identical to the “Lampshade” in shape and grain size, and one Italian were taken.

In the first test, which involved removing a layer of paint from a wooden log, Chinese and European consumables performed better . The shorter length of nylon fibers than the Lampshade brush made them tough and capable of removing paint from wood.

At the second stage, the quality of brushing the logs with the above brushes was assessed. Softer work with a nylon abrasive nozzle “Lampshade” created a pattern on the log with smooth transitions of soft wood fibers into hard ones and vice versa. European and Chinese specimens, with their short fibers, received an unpresentable pattern covered with shagreen. Here, the tested “Lampshade” brush looked better in terms of brushing quality.

The test showed poor interaction between the Russian company and the end consumer. Obvious errors in the design of the plastic housing in which the fibers are attached are evidence of this. The inability to attach the attachment, due to the thick wall of the body, to the angle grinder spindle may also be due to a lack of knowledge of angle grinder design. The lead manager's response to the author's remark about the possibility of fibers falling out due to the formation of a large skirt under the influence of centrifugal forces made us think about the competitiveness of the Russian manufacturer. What if the consumer doesn’t have electrical tape in their household?

Choosing a suitable grinder for cutting and processing wood

If you have to cut wood material, then you can do it with a grinder, but taking into account the correct choice of tool. Grinders are produced in different sizes and power, which determines the possibility of using attachments with a diameter of 115, 125, 150, 180 and 230 mm. An angle grinder for 115 mm cutting discs for wood is not the best solution. This is due to the following disadvantages:

• A small disk is installed on the tool, which is practically impossible to saw or process anything
• Inconvenience of working with a small grinder when processing large surfaces

The best solution for cutting wood with a grinder is a tool for circles with a diameter of 125 mm. It not only allows for efficient cutting of material, but is also considered to be as safe as possible. However, they are not so safe that they can be used even by beginners. It is better not to use tools with 150, 180 and 230 circles for cutting wood, since the high power of such grinders requires a lot of effort.

The safest option is considered to be an angle grinder for wheels with a diameter of 125 mm. This is the type of machine that should be used when you need to use a tool for sawing woodworking materials. Before you buy an attachment with teeth for cutting wood, you need to take into account not only its outer diameter, but also its inner diameter - the mounting hole. For modern standard tools, discs with a diameter of 22.2 mm are available.

Features of choosing a disk for wood

Grinder circles are produced in standard sizes. The minimum size is 11.5 cm. This tool is compact, but inconvenient for a large amount of work. The optimally convenient and safe tool with a 12.5 cm wheel. Anglers with 15 cm discs are inconvenient for processing wood and create conditions for increased injury.

When choosing a wheel, you need to focus on the markings indicated on the disk - its diameter, thickness, seat size, maximum permissible rotation speed, shelf life of the wheel and the material that can be processed with it.

Disc marking for grinderSource yandex.net

If you install a larger disc on a grinder than specified by the manufacturer, you may exceed the speed of the cutting edge, break the wheel, and cause injury. In addition, a small angle grinder may not have enough power to rotate a large disk. The most dangerous thing is that installing a large circle will require dismantling the protective casing, which can lead to injury when cutting wood.

Grinding

The grinding disc is selected depending on the nature of the work being performed. For roughing and roughing work, wheels with coarse abrasive and wire are suitable. The higher the grinding quality, the finer the grains of the abrasive material.

Grinding discSource tehnomuza.ru

Convenient grinding wheels with the ability to change abrasive discs of different grain sizes, attached with Velcro. The price of these replacement materials is low, but their service life is also short.

For finishing a wooden product – polishing – circles made of felt and pressed wool are used.

Cut-off

It is advisable to approach the choice of a cutting disc more responsibly, since sawing work is characterized by increased injury.

Do not process wood with discs intended for metal, stone or ceramics. To work with them, higher strength and higher speeds are required. In wood, such a circle can get stuck, break, and the instrument will burn.

Cutting discSource alicdn.com

Modern models of angle grinders are equipped with a standard shaft with a diameter of 22.2 mm. Older models have different shaft sizes. And if a disk can be installed on a model with a smaller shaft diameter using a special attachment, then if the shaft is of a larger diameter, then installing the circle will be impossible.

You shouldn't skimp on disc quality. The grinder creates high speeds, so the discs are made from high-strength, expensive material - tungsten carbide. The discs have increased strength and guarantee safety.

Cutting discs vary in diameter, depth of cut, shape, frequency of teeth and their number:

• For sawing wood of different characteristics, the best option is a disc with variably beveled teeth.
• For soft rocks, wheels with straight teeth are used.
• For medium-density chipboard, laminated material, and fiberboard boards, circles with trapezoidal teeth are used.

When cutting material, the discs may become very hot. When processing metal or stone, water cooling is used; when processing wood, this is not possible. Therefore, in order to prevent overheating of the disk, its expansion and possible deformation, disks are produced with rounded slots, through or filled with copper.

The design of the disk prevents it from overheatingSource prom.st

Grinding machines

In addition to the grinder, other equipment is used for abrasive grinding. Today there is a wide range of different grinding machines:

1. Belt machine for sanding timber. The machine performs grinding using an abrasive belt that constantly rotates on two rollers. The rotation speed depends on the power of the device. The machine has high productivity and copes well with large volumes of sanding flat surfaces. Great for roughing and removing old paint.
2. Eccentric sander for rounded logs. The machine can work on both flat and curved surfaces. It is equipped with a round sole on which the abrasive is attached with Velcro. Used for fine sanding and polishing of wood.
3. The vibrating machine for grinding log frames has a rectangular base. The machine can work on a flat surface, and it is also convenient to process the corners of a log house. Features high quality grinding.

Grinder cutting wheels for wood materials

Operating an angle grinder in tandem with a cutting disc for wood necessarily requires compliance with safety precautions. Work should be carried out in special protective clothing, and the workpiece to be cut should be firmly fixed in a vice or clamp. It is important to hold the tool with both hands to prevent it from being knocked out of your hands. Preference should be given to an angle grinder that has a speed regulator.

Manufacturers produce discs for grinders on wood of four main types, which we will learn about in detail:

1. Circular or toothed - appeared the very first, but did not gain widespread popularity due to their kickback effect. The disk has an external (end) arrangement of large teeth. Manufacturers produce wood cutting discs for grinders with a maximum diameter of up to 180 mm. The teeth can be equipped with special brazings made of carbide materials. Although such circles are the most common, they are the most dangerous attachment in action. If possible, avoid using it. It should be noted that such discs can only be used on grinders if the tool is used as a stationary circular saw

2. Chain - they look like a disk, only along the outer circumference instead of teeth there is a chain, like on chainsaws. This type of attachment is safer and can be used to cut medium-density wood chips. With wheels of this type, the risk of jamming and kickback is minimized. This is achieved due to the special design of the nozzle, which is similar to a chainsaw bar. The circle consists of two parts, and there is a groove on the end side. The saw chain is located in this groove, moving due to the force of inertia. This design prevents the disk from jamming, and is thus a safer option compared to the first type. It is strictly contraindicated to saw wood with nails. At the same time, the teeth quickly become dull and fail

3. Universal - received this name due to the fact that it allows not only sawing wood, but also cutting metal, as well as making grooves. The universal type nozzle has the appearance of a regular steel disk, but with three additional teeth in the form of grooves. The teeth are tipped with hard metal, which increases the service life of the cutting attachment. The advantage of a universal cutting disc for an angle grinder lies in the fact that it is as safe as a chain wheel, and at the same time costs 2 times less. Produced by Graff, which is why it got the name “count”

4. With a tungsten carbide edge, manufacturers do not stop there and are constantly improving their products. Another type of cutting disc that is completely similar to a concrete cutting attachment. The only difference is that on the end part of the circle there is a tungsten carbide coating (diamond coatings are also found). The disk is equipped with slots with holes that serve to dissipate heat when working with dense materials, such as wood. Wheels with a tungsten carbide edge are effective not only for cutting wood, but also other materials - plastic, metal, etc. It is better not to use such an attachment for cutting one metal, because it will quickly fail. The wheel does an excellent job of sawing wood that contains nails, screws and other metal objects.

Now it’s not difficult to choose saw blades for wood for an angle grinder, knowing what types there are. For housework, it is recommended to use a wood saw blade with a universal or tungsten carbide edge. They are not only considered effective, but also safe. Circles with a saw chain are more expensive, but they are also safe when cutting wood with a grinder. The most dangerous are circles with teeth. They are recommended to be used only in situations where a stationary circular saw is made from an angle grinder.

The dangers of using an angle grinder with wood

The only operations with wood that can be performed with an angle grinder (angle grinder) without danger are grinding and roughing, and then using special attachments. Of course, you can cut wood, but it is very dangerous. The Internet is full of shocking photos showing what can happen when using an angle grinder as a cutting tool for wood.

The main arguments that can be made against using an angle grinder for sawing are as follows.

1. This machine is not designed for sawing wood.
2. Since wood has a viscous and soft structure, the saw blade can jam in it. As a result, the grinder is often torn out of the hands, and it flies in an unpredictable direction (in the leg, along the arms, in the stomach, etc.), causing deep wounds or amputation of fingers. Even fatal cases have been reported.
3. When cutting wood, the saw blade heats up very quickly, causing it to begin to lose strength. The slightest misalignment or excessive pressure may cause it to fly apart. Since the spindle speed of an angle grinder is high, tool fragments fly away at the speed of shrapnel and penetrate deeply under a person’s skin. The user will be lucky if the fragments do not fly into the head or eyes.
4. Despite the dangers of using saw blades with teeth, some angle grinder users ignore this fact and continue to install compass disks with large teeth or improved with carbide tips. If, when cutting wood, a hard knot or nail residue gets caught in it, the tooth or solder breaks off, gets caught by the next saw tooth and is thrown out at the speed of a bullet. One can only guess about the consequences.
5. Ignoring all the warnings, users of grinders install a circular saw on the machine with a larger diameter than the protective casing. This is the most dangerous option for using an angle grinder.

Based on the above, you can cut wood with an angle grinder only at your own peril and risk, and only if this is a single or infrequent operation.

If you have to cut wood constantly, it is better to purchase a special machine for this purpose, or use a jigsaw. In extreme cases, the grinder can be used as a drive and made into a circular saw, securing the device rigidly to the frame.

Drill for sanding wood

To sand a wooden house, you can use a regular drill. With this tool you can quite easily and efficiently perform a small amount of grinding work. However, it is not recommended to use a drill for large areas. The drill is also equipped with grinding wheels, in the center of which there is a pin for installation in the chuck.

There are several types of drill attachments for grinding:

1. Flat, made in the form of a circle on which sanding paper is glued. The attachments are either rigid with Velcro or flexible with a rubber base.
2. Petal type, consisting of abrasive petals, similar to attachments on a grinder. You need to be careful when working with them. If handled carelessly, petal attachments can leave transverse lines on the wood that will appear through the varnish coating.
3. Drum nozzles are cylindrical in shape. The sanding belt is attached to the nozzle using a bolt. The drum is mainly used for grinding the ends of wooden workpieces.

How to make a nozzle with your own hands

Making accessories for a drill with your own hands is not difficult. Any available means are suitable for this. You can make a wire brush attachment using a piece of pipe and a piece of metal cable.

The manufacturing process consists of the following stages:

1. Cut off a piece of thin metal pipe. The length is chosen arbitrarily. To clean internal cavities, it is recommended to choose the following workpiece parameters: diameter – 10-20 mm, length – about 20 cm.
2. Make through holes in the upper part of the pipe at a distance of 1-2 cm. You will need 4-5 of them. The diameter of the drill is selected taking into account the thickness of the cable.
3. Cut the cable fragment into 4-5 pieces of equal length. The size is selected taking into account the diameter of the pipe (5-8 cm).
4. Thread the pieces of cable into the holes made in the pipe. The parts must fit tightly into the channels. Equal releases are made on each side.
5. Flatten the end of the tube on the side where the holes are made with a hammer.
6. Using pliers, release the cable.

The result is a brush with wire bristles. Such equipment can efficiently clean places where access to the tool is limited. These are mainly pipes of different diameters, cavities and recesses. Fix the attachment into the drill chuck, and the equipment is ready for use!

Other grinding accessories

Another tool used for sanding wood is a Dremel. This is a mini universal device. With its help, you can perform a wide variety of woodworking tasks with high precision: grinding, polishing, engraving, milling, drilling. It is used extremely rarely for grinding large parts, but if you need to apply a drawing or engraving on a wooden surface, then it has no equal in this work.

When sanding wood with a grinder or drill, marks from the sanding discs often remain on the surface in the form of lines, grooves, and depressions. Very often this happens due to inept handling of the tool and when working at high speeds. It is quite difficult to get rid of these marks; you have to sand the surface again by hand.

For manual grinding, you can use a simple device that our ancestors used to grind - a sanding block. It can be made from a rectangular wooden plank. The board must be wrapped in sandpaper and secured with nails or screws.

During grinding, a lot of dust is generated, which settles not only on the surface, but also enters the respiratory system. A log sanding mask, which is made from a special fabric that does not allow dust particles to pass through, will help protect your nose and mouth from dust.

Using a grinder when grinding concrete

Using an angle grinder, you can clean not only the wooden elements of the house. It can be used when you need to level concrete products with your own hands. Most often, concrete is polished with a grinder.

Before starting work, you should let the poured floor stand for about two weeks: during this time, the concrete will gain the necessary strength. Before grinding a concrete floor, its surface should be coated with a special compound, which, when reacting chemically with calcium hydroxide, forms a mineral binder. It can close the pores in concrete, which will give greater strength to the material and resistance to moisture. Floor grinding is performed with diamond cups specially designed for grinding concrete.

If you use cups with a grit of 400 or higher, you can get a perfect mirror finish.

Recommendations for selection

When choosing a polishing wheel for an angle grinder, you should consider several factors:

• outer diameter (larger sizes speed up the processing process and increase service life);
• landing diameter;
• thickness (the larger it is, the longer the circle will last);
• grain size (it must be selected taking into account the type of processing: for rough work - coarse abrasive, for soft work - fine).

When choosing a wheel, you also need to consider the size of the tool. The circle is secured with a special nut. When working with an angle grinder, it is important to strictly follow safety precautions. Circles should be chosen from the factory.

Cleaning and polishing metal with an angle grinder

Grinding is often necessary when manufacturing metal products using welding. Before painting the finished product, it is necessary to clean the welds, for which ordinary cutting discs are used.

Holding the angle grinder at an angle, remove all irregularities, thus leveling the surface. After this, the disk is replaced with a grinding wheel and the surface is brought to the required condition, if necessary, changing the grain size of the sanding paper.

Thus, you can not only grind metal with a grinder, but also polish it.

Despite the apparent ease of the operation, safety rules should not be neglected. It is necessary to work only using personal protective equipment.

Discs for milling and grinding on an angle grinder - purpose and types

The capabilities of angle grinders do not end with cutting, sanding and polishing wood. To expand the range of tool capabilities, manufacturers produce grinder attachments for milling and peeling wood materials. Stripping attachments are designed to remove bark and remove the paint layer from wooden surfaces. Peeling circles are available in different types, and differ in design, shape and purpose.

1. With an edge - their main purpose is to remove the top layer of wood, as well as grind the end part of wooden products. The applied edge made of carbide materials ensures a long service life of the nozzles. After processing wood with such attachments, you will need to additionally grind and polish the surface.

2. Studded - and they are divided into products with large and small spikes. Nozzles with small spikes are designed to remove the paint layer from the surface of wood, and those with large spikes are designed for leveling. If a wooden floor has a defect in the form of a different arrangement of boards in height, then sanding discs with large spikes allow you to quickly and effectively smooth the surface

3. With a working part made of wire or brushes - such attachments are used not only for processing metal, but also wood. A cup-shaped disc with an angular wire arrangement is used to remove paint layers from large surfaces. A nozzle with an end wire arrangement is used to remove the paint layer in places with limited access, for example, in the grooves of processed wooden structures. Another type of attachment that craftsmen use to work with wood is a brush with a thin wire. Used for finishing roughing of wooden surfaces

4. A disc plane is an alternative replacement for a conventional manual or electric plane. The disadvantage of the first option is that it takes a lot of effort and time to complete the work. It is rational to buy an electric planer only when large volumes of work are being carried out to remove the surface layer. Special discs for grinders, replacing electric planers, came to the aid of the home craftsman. The attachment is a massive circle with three flat knives. It is intended for removing bark from a tree, and the end result is achieved very quickly. Dull knives can be sharpened

A special class of attachments for grinders are milling wheels. Special disks, driven by the spindle of the angle grinder, are used for sawing and cutting grooves of different widths. It is also worth noting that the use of milling attachments on an angle grinder is not safe. Every year the number of options for cutter wheels for grinders increases, but you need to work with such attachments with extreme caution. Let's look at the popular options for milling wheels for angle grinders:

1. The wheel rim has the appearance of a thickened circle with cone-shaped spikes located on the end part. Used for making grooves in wooden workpieces. The nozzle has teeth along the base, the main purpose of which is to obtain clean grooves without chips

2. Serrated toothed disc - used for making shallow rectangular grooves in woodworking materials

3. Toothed disc with additional tenons over the entire surface - allows you to make deep grooves in wood workpieces

The production of various attachments for grinders for the purpose of wood processing can significantly expand the functionality of an indispensable tool in the household. The grinder today replaces most hand and electric tools, so every master must have at least one type of this tool.

Some general information

An angle grinder or angle grinder, better known as an angle grinder, is a universal tool for various tasks:

• rough and fine sanding of wood;
• polishing, cleaning surfaces;
• removing bark, cutting branches from trees;
• sawing boards, chipboard, fiberboard, logs.

Such a wealth of tasks that can be solved makes the grinder the most versatile of all grinding machines. It is called angular due to the fact that the axes of the engine and the working circle are located at right angles to each other, in contrast to machines with a direct arrangement.

At the same time, an angle grinder is a tool specifically for periodic work around the house, minor repairs, and replacement of floor coverings. Attachment disks allow you to cut, sharpen, and polish workpieces. For regular work with wood, stream production for the purpose of earning money, you need a professional category tool.

Structure of an angle grinder

Grinding and polishing wheels for angle grinders - varieties

Working with wood involves not only cutting it, but also other types of processing. These types of work include polishing and grinding. Before you begin such work, you will need to prepare the material. The wood being processed must be dried, otherwise it will negatively affect the quality of the work. The following attachments are used for polishing and sanding wood with a grinder:

1. Petal wheels are a type of wheel for an angle grinder, consisting of a metal round base with glued strips of sandpaper around the circumference. Flap discs are suitable not only for sanding wooden surfaces, but also for polishing them. It is also important to understand that flap wheels are produced not only for processing wood, but also metal, and they differ in the type of abrasives used on sandpaper

2. End - needed to adjust the dimensions of the part. Sheets of sandpaper are glued to the end side of the disk, as in the photo below. The attachments work on the principle of a file. End discs are characterized by such a parameter as roughness, which depends on the nature of the work performed. The higher the roughness index (that is, the abrasive particles are small), the softer the grinding operations can be carried out with the nozzle. They are often used for restoring furniture and removing paintwork.

3. Polishing - for final processing of wooden surfaces. The products have different degrees of grain, as well as a simple design. The basis of the nozzle is a backing with a sticky part. Replaceable polishing attachments, which are made of soft abrasives, are attached to the Velcro part. The advantage of such products is that they can be quickly changed if necessary to switch to a different grain size. Polishing discs are used on an angle grinder to finish cleaning a wooden surface.

Depending on the type of wood work planned, it will not be difficult to choose the appropriate type of polishing or grinding attachment for an angle grinder.

Brushes

It is believed that metal brushes are designed to remove paint and rust from steel surfaces. This is true; however, products made from brass-plated steel wire, due to their relative softness, are also successfully used on wood. The price of the brush, which does not exceed 150 rubles, combined with a much higher resource compared to sandpaper, makes it a more than competitive solution.

The photo shows a brush attachment made of brass-plated wire with a diameter of 0.3 mm.

What can wire brushes be used for?

Of course, fine grinding is not their specialty.

• They help to quickly and effectively remove paint and varnish coatings from hardwood.

Please note: as a rule, the main layer of paintwork is removed with a spatula after heating with a hairdryer, burner or after treatment with a remover. The brush helps remove paint residue from cracks, corners and uneven surfaces.

• They allow you to perform the so-called brushing of wood.

The last term is worth paying attention to. Brushing is the artificial aging of wooden pieces of furniture or interior design. When brushing, the softest fibers are removed from the surface; at the same time, uneven textures and annual rings are emphasized. This simulates the natural wear and tear of the product.

Brushing is especially effective after treatment with stain: the relief of the wood is emphasized by the transitions of tones.

The result of brushing.

Self-grinding mistakes

Most home craftsmen sand a wooden house with a household-grade grinder, which is not easy to use, has little power, and overheats quickly. A household appliance is not capable of sanding wood at a good quality level.

Professional equipment is expensive, so not everyone can afford it. But even if you buy such a model, you need to know how to use it, otherwise, if handled ineptly, high-quality grinding will still not work. Many people make the mistake of working at high speeds, pressing hard on the tool, which leads to damage to the surface.

The wrong choice of nozzles also does not lead to anything good. In the best case, the surface will simply be poorly polished, and in the worst case, cases of injury cannot be ruled out.

How to use?

The grinder has a simple technical device. It is equipped with an electric motor connected to an angular gearbox. It ensures shaft rotation at high speeds of up to 1000 rpm (when working with wood, this speed is optimal). Powerful models require a three-phase power source; for household use, a standard power source with a voltage of 220 V is suitable. You have to work with the tool with a single point of support, holding the angle grinder suspended. Misalignment can lead to jerking, so a novice master needs to acquire serious skills for work.

Compliance with safety precautions will allow you to work correctly with the machine, namely:

• inattention in this matter is unacceptable;
• in order to prevent injuries when using an angle grinder, the protective casing is not removed from the disk;
• do not work with wood using strong feed;
• Before starting operations, be sure to wear goggles and thick gloves; protect hands with long sleeves; clothing should not be light, as sparks may fall on the body;
• It is important to take breaks during work so that your hands do not get tired and the machine does not slip.

It is convenient to work with a tool that has a support handle. The safest are those grinders that are equipped with a chainsaw chain. If the machine suddenly jams, the disc continues to rotate, which minimizes the risk of injury. It is also important to move the machine smoothly across the floor surface, avoiding vibration. Before starting work, you should once again make sure that the circle is securely and accurately attached to the axis.

It is better to start mastering the tool with cutters with small teeth. The smaller the teeth, the easier and safer the operations. During operation, any disk wears out, the diameter of the circle changes, and replacement is necessary. Change discs when switching from one type of processing to another during the grinding process.

It also happens that the disk is cracked or the casing is broken. It is imperative to remove and replace such a disk; further work is dangerous.

You should follow the following step-by-step instructions:

1. disconnect the tool from the network, stop rotating the shaft by pressing the locking button, only after this is it possible to unscrew the disk and remove it;
2. unscrew the retaining nut - the stopper is removed using a wrench; if the nut is tightened too tightly on the disk, you will need a gas wrench, which is heated and cooled before use, and the remaining part of the disk is cut out with a hacksaw;
3. remove the unusable disc;
4. put on a new one and secure it with a lock nut, firmly fix the thread on the accurately installed disk, after which you can continue working.

For details on the intricacies of sanding wood with a grinder, watch the video below.

Unwinding methods if the disk is jammed

What to do if the clamping flange is jammed? This trouble, when the nut is bitten, often occurs if, while working with thick and durable materials, the tool gets stuck in the workpiece. In this case, the abrasive wheel often breaks, and the spindle, which continues to rotate, tightly tightens the pressure flange. To unscrew the grinder if the disk is jammed, there are several ways.

Using a gas key

This method is considered not entirely safe, since the stopper can be broken, although in most cases it is possible to unscrew the nut. To avoid breaking the spindle lock, do not apply much force to the gas wrench. The design of the lock is designed to withstand the force applied by a standard wrench.

You can unscrew an overly tightened flange using 2 gas wrenches. To do this, break off the protruding ends of the abrasive wheel with pliers so that you can reach the lower flange with the first gas wrench. Next, clamp both flanges with keys and turn them in opposite directions (taking into account whether the thread on the spindle is right or left).

Disassembling the gearbox

If the lock is broken, you will have to disassemble the gearbox to remove the tool from the angle grinder. Use pliers to break off the edges of the remaining abrasive wheel so you can get to the bolts holding the gearbox cover in place. After this, unscrew the fasteners and open the gearbox. The cover will be removed along with the gear shaft. Next, this shaft should be clamped in a vice, having previously placed aluminum spacers between the steel jaws, and using a gas wrench, unscrew the flange (do not forget to determine the direction of unscrewing).

Nut heating

The nut can be heated using a gas burner, a hair dryer or a blowtorch. The heated flange can usually be unscrewed with a standard grinder wrench.

Grinding a jammed circle

If after using the first 3 methods the nut does not unscrew, then the remaining abrasive wheel between the flanges can be ground off. To do this, do the following.

1. Use pliers to remove as much of the remaining circle around the edges of the nut as possible.
2. Clamp a piece of sheet iron in a vice as thick as the disk itself, turn on the grinder and grind off the remaining circle on the end of the sheet iron.

But the use of a stationary abrasive wheel requires great care, because when grinding off the remains of the tool, the geometry of the flange can be damaged. If this happens, you will have to trim the nut.

Using Penetrating Lubricant

Liberally spray the flange/shaft joint with WD-40. It tends to penetrate into inter-threaded spaces and small cracks. After applying the liquid, wait about 5 minutes and try to unscrew the fasteners with a standard key.

Using a hammer drill

Some owners of grinders, in a situation where the clamping nut is jammed, install a “chisel” or “jackhammer” attachment in the hammer drill, insert it into the flange hole at an angle and turn on the jackhammer mode without rotation. Accordingly, the stop button must be pressed. Just a couple of gentle presses with a hammer drill are enough (so as not to break the shaft lock), and the nut will begin to turn.

Cut the pressure flange with a hacksaw

This method can be called radical, since you will have to buy new fasteners, and it is used if the nut cannot be unscrewed by any other methods. To cut the flange, hold the stop button to prevent the shaft from rotating and, using a hacksaw, cut the fastening nut.

Sanding by professional craftsmen

By choosing professional services from qualified specialists, you save yourself from many problems. In our work, we use modern equipment and high-quality grinding attachments, which we select in accordance with specific working conditions. Sanding is carried out at the optimal moisture content of the wood with precise adherence to technology. Our craftsmen have extensive grinding experience and know all the intricacies of this work. To leave your request, contact us using the coordinates on the “Contacts” page.

Gentle processing with grinding wheels

When performing grinding work, special attachments are used:

1. Petalaceae. They are used for grinding solid wood, performing soft processing. The surface of such a nozzle has a large number of trapezoidal petals made of sandpaper. They are like fish scales, overlapping each other. Thanks to this, the wear resistance of the nozzle is great. There are discs of different grain sizes. The speed and quality of work depends on this characteristic. It is advisable to have discs with both coarse and fine grains. Please note that working with petal attachments requires some skill. Therefore, it is necessary to practice properly before a responsible task. It should be noted that petal circles have a long service life. Their sizes are different: from 115 to 230 mm. One such circle is enough to process 10 square meters. m. wood.
2. Velcro discs. For grinding and polishing wood, as well as stone, metal and other materials, sanding discs with Velcro are used. The diameter of the working platform is generally 125 mm. But you can find larger sizes on sale. The corresponding discs are attached to the base with Velcro. There are sandpaper devices that allow you to carry out grinding work. They can have different grain sizes: both coarse and fine. They are sold in the form of sets, each of which contains 5 discs. A polishing disc, usually felt, can also be attached to the base. It is also secured with Velcro. Using this tool you can work with metal, plastic, plexiglass, marble, polishing them to a shine. Work with metal is carried out using a special GOI paste. It is applied to the disc. The polishing attachment can also be made of sheep wool. It achieves the finest polishing to a mirror shine.
3. Diamond flexible grinding wheel. Used for polishing marble and granite. The grain size of these attachments ranges from 30 to 3000. It is advisable to work with an angle grinder, in which the speed can be adjusted. The ideal speed for work is 2.

Varieties

Grinding is the basic purpose of an angle grinder. In the case of working with wood, this is a complex process that requires care and skill from the master. Natural wood of varying structure is brought to perfection with high-quality and reliable discs. Regular diamond cutters will not work here. There are special grinding wheels for the woodworking industry.

There are several types of grinding wheels for angle grinders. First of all, the initial cleaning of surfaces is carried out. This work is performed by several disks, differing in shape and size.

• Roughing. They are designed to remove old paint and varnish from wood. Typically, remnants of the previous coating that cannot be cleaned by hand are removed from windows, window sills and floor surfaces. The disc is equipped with steel wire bristles for rough processing. The elastic bristles are placed either around the entire perimeter of the circle, that is, along, or at an angle segmentally, as in a regular brush. It depends on the purpose of the nozzle.
• Cord brushes with wire or spikes. They allow you to level and smooth the surface of any material. A wire brush can be used to easily remove a layer of varnish or old paint or rust from metal. If the boards on the floor are of different heights, they can be compared with each other using a tenon circle. They vary in shape and speed of rotation.
• End fittings. They work in layers, like files, with sides and edges, corners and oblique cuts. The attachments are designed for sanding edges or straightening bevels.

When sanding with a sander, the wood layer remains intact, only the decorative coating is removed. This property of the grinder is indispensable when restoring products. Having removed the previous colorful design, you can apply another one to the fresh and smooth panel. At the same time, the furniture will change its appearance and will look new. A brush is used to brush or artificially age the material. To do this, the soft fibers are removed to reveal the rings and grain of the natural wood. The stain emphasizes the relief transitions.

At the next stage of processing, the surface is smoothed. Here experts advise using polishing wheels. They are made of sponge, felt and coarse fabric, with replaceable sandpaper. Fabric and felt are secured for work using Velcro. The attachments are sold in sets of five for easy replacement. Sandpaper is selected with medium or fine grit. The brand is usually indicated on the packaging.

The design of the nozzle is also important. Lapping or finishing wheels are divided into petal, solid and movable. The use of a petal wheel allows you to achieve an absolutely smooth surface. Several layers of emery are placed on the disc as an abrasive, overlapping like fish scales. This arrangement of the abrasive material reduces wear. The product is brought to an ideal state by such a modern attachment as a cup circle. The bowl provides minor texturing and penetrates joints easily. It has a pile made of synthetic material or corrugated wire reinforced on it.

A nylon wood brush consists of a large number of small bristles. It is used for final polishing. The bowl-shaped attachment allows the craftsman to sand the most difficult to reach areas of the part. The brush removes burrs and minor dirt and polishes the varnish. End brushes are made of polymer abrasive, cylindrical brushes are made of brass and steel wire.

Machine Applications

All three stages of finishing can be performed on special grinding machines or using other electrical equipment: grinders for smooth or angular surfaces. There are homemade brushing machines. It is difficult and expensive to make a full-fledged machine with your own hands, working like a thickness planer, so they use the same grinder with several metal and nylon attachments.

Full mechanization of work makes sense for large volumes of wood that require brushing. In such a situation, investments in the acquisition and operation of units will be justified. Common types of home repair and construction work can be quite successfully done with an angle grinder, which every craftsman has.

Sources

• https://master-srubov.ru/sovety/nasadka-na-bolgarku-dlya-shlifovki-dereva
• https://moiinstrumentu.ru/diski-po-derevu-na-bolgarku.html
• https://tokar.guru/instrumenty/ushm-bolgarki/polirovochnye-nasadki-dlya-dereva-na-bolgarku.html
• https://intehstroy-spb.ru/osnastka/nasadki-na-bolgarku-dlya-shlifovki-dereva-raznovidnosti-i-sovety-po-vyboru.html