A sander for wood is a necessary tool during repair work, used for surface treatment. Electric grinders are of different types. You can buy them in the store or make your own.

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Why do you need a grinding tool for wood

Grinding machines are used both in everyday life and in production. During repair or construction work, such power tools are essential. With their help, various surfaces are processed. If you need to remove old paint, polish parts to a shine, or restore furniture, you can't do without a sander.

What are the grinders

Before you buy a grinder (CM), you need to determine which surfaces it is needed for processing. Modern tools can be divided into several types, and each of them has its own characteristics. CMMs differ according to the principle of operation, types of the processed surface. Among them: models of belt, brush, vibration, eccentric type.

Belt sander

The strip model is most often used for treating wood surfaces. Such machines have interchangeable attachments that allow processing metal and plastic parts.

Also, tape-type models are used when sanding parquet. The floor sander allows you to rough and finish the surface.

The device of the belt SHL looks like this: an electric motor of low power and rollers on which the abrasive belt is pulled. It has a closed shape.

When the machine is turned on, the rollers rotate, driving the sanding belt. If you run the typewriter over the surface of the wood, it will remove a decent layer from it.

Its thickness can be adjusted. The coarser the grain of the tape, the more layer it can remove. The surface area that needs to be processed depends on the width of the abrasive. The speed of rotation of the working element affects the thickness of the removed layer.

When buying an instrument, the defining indicators will be:

• belt rotation speed;
• tape dimensions;
• model power;
• way of centering the belt.

Ideal if the rotation speed can be adjusted. This will expand the range of use of the loop of the machine. Usually tape dimensions are 76 * 457 mm. There are also models with parameters 76 * 533 mm and 76 * 610 mm. A power of 1 kW will be enough. Automatic belt centering is very convenient as it often needs to be corrected. The tape often slips off during operation, you have to return it to its place. That is why it is much easier if the model is equipped with automatic centering.

Brush sander for wood

The working element of the model is a brush. With its help, the tool can be entrusted with rough work. Models of this type can easily remove paint and varnish. Also grinders for metal are able to remove rust. Brush models are sometimes used when it is necessary to artificially age a wooden surface.

When choosing a brush machine, you should pay attention to its characteristics, including:

• mass of the tool;
• shaft diameter;
• sizes and types of replaceable brushes and blades.

For thorough processing of materials, a strong pressure of the blade of the sander against the surface to be processed is required. For this, the optimal weight of the model should not be lighter than 4 kg. The quality of processing is influenced by the diameter of the shaft, since it is he who determines the rotation speed.

Vibratory sander for wood

When the most thorough surface treatment is needed, vibrating CMM are used. They are used in furniture restoration. Models of this type are needed for finishing before coating the wood with varnish or stain.

For the convenience of processing corners, the working element of the vibrating grinder is rectangular. Also, in hard-to-reach places, power tools with a triangle-shaped work sole are used.

With this electric sander, it is easy to process indentations and recesses. Typically, these models are rarely used, as they handle specific surfaces.

The defining qualities when choosing will be:

• rotational speed;
• processing depth.

The speed of rotation and the ability to adjust it is just as important as on tape models. Vibration grinders are ideal for surfaces with significant height differences.

Eccentric sander (ESHM)

Eccentric CMM is used when it is necessary not only to grind parts, but also to give them a shine. Such a tool is capable of polishing only flat surfaces. If they are bent, you will have to take on a different type of CMM.

The working element of the eccentric model is a disc, the diameter of which can reach 15 cm. The surface is polished using emery wheels mounted on eccentric units.

At the time of buyinggrinders for wood it is worth giving preference to power tools, in which you can adjust the amplitude of oscillations and the frequency of rotation of the disk. In this case, even a beginner can cope with such a model.

How to make a sander with your own hands

Sometimes the high cost of power tools makes you think about making a sander yourself. This is especially true if it is necessary for a one-time job.

What is required for manufacturing

Having figured out the device of the grinding machine, they begin to manufacture its parts. The power tool for surface treatment consists of:

• bed;
• engine;
• drums;
• sanding belt.

Step-by-step manufacturing instructions

Iron parts are durable and reliable, so it is recommended to make a table from this material. The canvas should be 50x18x2 cm in size. On a milling machine, it is cut on one side. In this place, the motor is subsequently installed.

Note! On a large bed, you can machine more varied parts.

Now you need to prepare the engine. Its power should be about 2 - 3 kW, and the intensity of work - 1500 rpm. The washing machine motor will be the ideal motor for the design.

To make a grinder, you need 2 drums. One of them is the leader, the other is the follower. You can make them from chipboard. The manufacturing process looks like this:

1. Workpieces are made of chipboard with a size of 20 * 20 cm.
2. Collect a bag from blanks. The thickness should be 24 cm.
3. Fold and grind to a diameter of 20 cm.
4. The drum driving the belt is fixed on the shaft.
5. The slave drum remains. It must be mounted on bearings around the bed axis.

Sanding belt - sandpaper. Strips 20 cm wide are cut out of it and glued. In order for the segments to hold tightly and for a long time, you need to use high-quality glue. The location of the tape depends on the type of machine and can be horizontal, vertical and inclined.

When all the elements are assembled, they begin to attach them to each other. The assembled structure is quite suitable for wood processing. You can get to work!

How to make a grinder from a drill

Not everyone has a sander at home. Sometimes it is simply necessary, and what to do if it is absent? It is quite possible to replace it with a drill. How do I sand wood with this tool?

For surface treatment, different types of attachments are used. The brush is used when you need to clean the surface of the old paint layer. This processing is considered gross. The brace is a washer with hard steel or soft copper twisted wires.

For a more accurate surface treatment, use a special attachment with grinding discs for a drill. Depending on the required level of processing, the discs are of different grain sizes. They are attached with Velcro to the nozzle.

For the processing of complex parts, a flap grinding attachment is selected. It looks like this: a disc with strips of sandpaper attached to it. In addition to grinding surfaces with a drill, you can polish parts. For this, a special sponge acts as a nozzle. The polishing paste is applied to the surface and rubbed to a shine with a sponge.

When the drill is used ashand sander for wood, it is important to adhere to the following instructions:

1. The drill bit must be secured in the chuck.
2. To make the tool more comfortable to hold, an additional handle is attached to it.
3. During operation, it is important to hold the tool firmly, and it is also necessary to ensure the same pressure on the surface. On the packages with nozzles, instructions are indicated, according to which the permissible number of revolutions must not be exceeded.

Note! During operation, the tool may heat up, in this case you need to take a short break. We advise you to familiarize yourself with the rating of grinders!

Which wood sander to choose

In hardware stores, you can see a large number of different types of wood sanders. How to choose the most suitable model? Power tools for woodworking differ in cost, as there are professional and household ones. Household grinders are cheaper, but they are designed to run continuously for 3 hours. After that, be sure to take a break for 15-20 minutes. Professional models are able to work for 8-12 hours without stopping. Sometimes you can take a short break, but it is not necessary.

Popular belt grinder models:

Among eccentric grinders, the most commonly used are:

Before you buy a sander, be sure to check it at idle in the store. This will determine the vibration and noise levels of the power tool. The sander must also be handled. If the tool is comfortable to hold and all the switches are in the right place, you can start looking at the following metrics. They play an important role in the choice of power tools:

• power consumption;
• the presence of rubber handles;
• cord length;
• weight;
• engine speed control;
• the ability to connect the device to a vacuum cleaner.

Power consumption can only be compared with models of the same type. Grinding machines are available in power from 120 W to 1.2 kW.

Rubber handles are needed for comfortable use, if they are available, the tool is firmly held in the hands, does not slip.

Heavy cars are more stable and easier to drive. If you need to machine a large vertical surface or sand the ceiling, we recommend using lighter models.

By adjusting the speed of rotation of the belt, you can use the CMM for different types of work. High revs are suitable for processing and sanding wood. To successfully complete the work, you need to ensure that the tool does not vibrate in your hands.

Almost all models are equipped with special containers in which all dust accumulates during operation. Containers or bags need to be constantly cleaned and this is inconvenient with constant work. It is much easier to connect the tool to a vacuum cleaner.

Useful video: choosing a grinder

The choice of a grinder depends on the type of surface to be treated. When buying, pay special attention to the characteristics of the model. The tool is purchased in a specialized store or made by hand.

Needing a grinder for periodic woodworking and not wanting to spend money on professional equipment, you can independently assemble a power tool using the materials at hand, as in this project.

Materials (edit)

To make a do-it-yourself grinder you will need:

• suitable electric motor;
• fasteners;
• grinding disc;
• pieces of plywood;
• sandpaper;
• drill;
• saw;
• roulette.

In this project, the tool was based on an old electric motor from an air compressor. It is powerful enough to make the finished product perform as well as dedicated wood processing equipment.

Step 1... Be sure to attach the purchased grinding disc to the existing engine. This will help you determine the parameters of the motor pedestal.

After carefully making calculations, assemble the base from boards or pieces of plywood. Be sure to attach the motor to it.

Step 2... Cut out the base for the disc from plywood, carefully sand the edges of the cuts with sandpaper. Using the motor pulley, mark the holes in the center of the disc. Drill them with a drill, and bolt the pulley and the round plywood base together.

Step 3... In fact, the grinding tool is ready, you will need to attach the disc itself to the plywood base, and you can work safely. Or, as in this project, you can assemble a box from the remnants of lumber so that the power tool looks nice externally, and also bring the tool start button to its front part. Before assembling the box, be sure to make careful calculations.

Work with the received tool should be extremely careful and in compliance with safety rules. The speed of rotation of the disk is high and the likelihood of grinding off nails or injuring your hands during processing of small parts is high.

When carrying out construction and repair work, men often need to process wood, stone or metal. For quality work, it is advisable to purchase a belt sander. But what if the finances do not allow making such a purchase? To do this, it is enough to build a belt sander with your own hands.

Purpose of the belt sander

Wood is widely used in a wide variety of manufacturing organizations. Many different parts and products are made from wood. In order to properly process a wooden blank and give it the appearance of a finished product, it is customary to use various equipment, including belt sanders.

Belt grinding equipment, as a rule, is used in the final stages of production, when parts are subjected to finishing machining. Such devices are conveniently used in the manufacture of furniture and various consumer wood products. Depending on the material used, belt grinders work with wood or metal.

The main purposes of using wood grinding machines are the final leveling of the surface, bringing their level of roughness to the required value, obtaining even and smooth surfaces of wood and wood products before veneering or after coating with varnish and other finishing materials, removing local irregularities in the form of recesses and elevations, deburring and removal of local build-ups of varnish and primer, deburring, internal grinding and grinding of curves.

Belt grinders for metal work with various materials and formats that are popular in metalworking: plain and alloy steel, non-ferrous metals in the form of rectangular, round and flat workpieces. Grinding machines allow you to grind round timber and large-diameter pipes efficiently and with minimal time expenditure.

Depending on the type of processing and the type of feed, belt grinders are intended:

• for grinding curved surfaces with a loose sanding belt;
• for processing a flat surface with a stationary table, manual movement of the iron and the table, as well as mechanized movement of the desktop and manual movement of the iron;
• for processing panel and bar parts, their ends and side edges;
• for intermediate sanding procedure for paint and varnish coatings.

Belt sander design

Belt grinders are produced by modern foreign and domestic manufacturers in a wide range. Grinding machine prices vary considerably. They also differ in their possible performance and their design. However, they also have something in common. They are united by the fact that absolutely all machines have an abrasive belt as a working body, which is most often connected in a ring and placed between rotating drums.

One drum is the master and the other is the slave. This means that the first of them is equipped with a mechanical transmission, which is most often based on a belt drive, with the help of which torque is transmitted from an electric motor to it. Any belt sander is designed so that the speed of movement of the driving drum, and therefore the speed of movement of the abrasive belt, can be changed, providing different modes of surface treatment.

The abrasive belt can be positioned vertically or horizontally. In addition, there are equipment modifications on sale in which the working body is installed at a certain angle. The abrasive belt is mounted on the bed, on which the workpieces are usually located. The workpieces can be held manually by the operator, or with the help of special devices that facilitate the work of consumers and make the processing procedure more efficient and safe.

The machine table is made of metal sheets or thick boards. If the design provides for the manufacture of a table from metal, then it will turn out to sharpen more complex products. The length of the working part of the belt sander and the belt itself for grinding primarily depends on the length of the products that will be grinded on the machine.

If the part has a shorter length than the working surface of the machine, then it will be much more convenient to process it, and the processing will be of higher quality. For example, with a sanding belt length of 4.5 meters, you can easily process wood pieces that are 200 centimeters long.

Belt grinders are divided into equipment with a fixed and movable work table and devices with a free belt. A special group is wide-belt grinding machines, in which the table, which is made in the form of a caterpillar, is at the same time a feeding device. For machines with tables, the tape is placed horizontally, for structures with free tape, it is installed in different ways.

Since a lot of dust is inevitably generated during the grinding process, all belt grinders are usually equipped with special powerful hoods that remove most of it during the process itself. Grinding machines are powered by an electric motor, which has a power of about 2.8 kilowatts. With a high power motor, the normal belt speed is 20 meters per second.

Abrasive belts for grinding machines

The cutting tool of belt sanders is a sanding belt, which consists of a fabric or paper base and abrasive grains that are attached to it with adhesives. Abrasive belts are made by two methods: mechanical and electrical. The first method consists in evenly pouring abrasive grains onto the base, which is covered with glue, and the second method takes place in an electric field, which orientates the grains upward with the sharpest edges to improve the cutting properties of the grinder.

Abrasive grains are poured onto the base in a bundle tightly or sparsely. The most effective is an abrasive belt with a sparse backfill, when the grains occupy less than 70% of the area, because the wood dust formed during the grinding process is not able to clog between the grains. Natural minerals or artificial materials that have high hardness can be used as abrasives, such as green and black silicon carbide, white and normal mono-corundum, and normal fused alumina.

For the purpose of gluing the grains, synthetic resins and skin glue are used. As a basis, they use a fabric such as coarse calico and twill, or special grade paper. The size of the abrasive grains is indicated by a number that corresponds to the mesh size of the sieve in which these grains are retained, and is displayed in hundredths of a millimeter.

If you are interested in how to make a belt sander, then you should pay attention to the following sizes of grinding powders and abrasive grains and their classification: grinding grain - from 2000 to 160 microns, grinding powders - from 125 to 40 microns; micropowders - from 60 to 14 microns, very fine micropowders - from 10 to 3 microns.

In woodworking enterprises, the sanding paper comes in sheets or rolls. On the non-working surface of the skin there is a marking with the specified characteristics of the skin and the manufacturer. For a belt sander, skins are used in rolls and cut into belts of a certain length and width. The length of the cutting tool is determined, depending on the method of its connection - overlap or butt at an angle.

The ends are cut off when gluing end-to-end at an angle of 45 degrees and then glued onto a linen lining with a width of 80 to 200 millimeters. At one end of the tape, when gluing with an overlap, the abrasive grains are removed with hot water for 80 to 100 millimeters, then the other end of the tape is applied to the exposed base greased with glue. Squeeze the joined ends and dry them using a special tool or a size press.

Sheet skins are used for combined belt grinders. For grinding discs, it is customary to cut the skin in the form of a circle according to a template, the diameter of which is 60 - 80 millimeters larger than the diameter of the disc. Using a rectangular template, the blanks are cut out for the bobbin. After cutting, they have smooth edges without tears. The presence of loose ends or seals when gluing the tapes can cause the tape to break prematurely.

The skin is cut for wide-belt sanders into sheets according to a template made of plywood or aluminum sheet. The skin is cut in such a way that the edges are smooth, and the difference in the length of the side edges is no more than 1 millimeter. One of the beveled edges is cleaned by removing the abrasive at a width of 20 millimeters. The peeled edge and longitudinal edges are pasted over with a strip of tracing paper, which has a width of 40 millimeters, which protrudes from the edge of the skin by about 10 millimeters.

Lubricate the beveled edge with tracing paper with glue and stand in air, depending on the viscosity and type of glue. Then the beveled edges are connected and a strip of skin is applied to the joint, the joint is squeezed and held in the press. It is customary to hang the finished endless belts on special brackets and keep them for at least a day in a dry room before being installed on a grinding machine.

The operating principle of a belt sander

The belt sander consists of a table top with a work table for attaching the cutting tool. This table is fixed in different positions relative to the table top. The material for the countertop is usually laminated chipboard 25 millimeters thick. The working table on rollers is moved manually or in the transverse direction by means of a mechanical drive along circular guides that are attached to the calipers.

Above the table there is a working belt, put on the non-drive and drive pulleys. The sanding belt is tensioned and adjusted by means of a screw device with a pneumatic cylinder. Double belt sanders have two identical sanding tools that are placed in series on the bed and have sanding belts that move towards each other.

Grinding is carried out with the transverse movement of the working table and the longitudinal movement of a short iron, which presses the belt to the material being processed. The sanding belts are driven by an electric motor through a belt drive. Waste generated during grinding is captured by a dust collector, which is connected to the exhaust network.

When assigning a grinding mode, it is recommended, according to a certain roughness and properties of the material that is being processed, to choose the grain size of the sandpaper, the feed rate and the pressure of the belt to the product. It is customary to choose the grain size of the skin, depending on the hardness of the materials being processed and the required surface roughness. The clamping force and the feed rate are interdependent quantities. With a small effort and a high feed rate of the sandpaper, some parts of the surface can not be sanded, with high pressure and low feed, burn-through and blackening of the material are possible.

Before installing the tape, check the quality of its adhesion. Do not use improperly glued and torn abrasive belts with an uneven edge. Using the handwheel, you can reduce the distance between the pulleys and put on the belt. The place of gluing is placed so that the outer end of the seam from the abrasive side is directed against the working movement of the sanding belt.

The belt tension can be adjusted by moving the belt sander idler or non-drive pulley. It is not advisable to over-stretch the tape as this will cause it to break. But the sanding belt slips along the pulleys at low tension and heats up very quickly. The tensile force is set, depending on the strength of the base of the cutting tool and is determined by the arrow of its deflection with slight pressure on it.

How correctly the tape runs up can be checked by turning the pulley manually or by briefly turning on the electric motor. When the belt slides off, the pulley axis is turned by a handle at a small angle and fixed with a locking device. After setting up the belt sander, the dust extraction system is switched on, a trial processing of the parts is carried out and their quality is checked.

Manual belt sander can be serviced by one worker. Moving the product relative to the cutting tool in the longitudinal direction, and turning the part around the axis, the operator in contact with the tape sequentially enters all the areas that form the surface to be machined. Slowing down or careless movement may result in sanding.

It is customary to grind individual parts of the part in several passes. Achieve high-quality alignment is possible with the correct regulation of the pressure that is applied to the iron handle, and the speed of movement of the table and iron. The pressure when approaching the edges must be reduced to prevent them from grinding. To increase the quality and productivity of grinding, small blocks are placed on the table in a row, several pieces at a time.

Belt grinders with mechanical feed of products are served by two operators. One of them places the part on the conveyor, orients it along the width of the working table and guides the product under the clamping elements of the machine. When gripping the conveyor, parts must not be moved laterally.

It is not allowed to feed into the machine workpieces with unequal thickness and parts with rough surface defects. The feed rate and pressure of the clamping beam are usually not controlled during processing. The second operator is engaged in the reception of finished parts and makes sure that there is no unacceptable rounding of the edges and grinding.

Belt sander manufacturing

The price of belt grinders from an industrial manufacturer is quite high, therefore, with their infrequent use, the craftsmen involuntarily think about whether to buy equipment or not. An alternative to buying an expensive machine is to assemble it yourself. The main parts of the machine are the bed, the rollers and the engine.

The motor can be removed from the old washing machine. Cut the bed out of thick iron measuring 500 by 180 by 20 millimeters. Cut one side evenly on a metal milling machine, it is required to mount the platform with the motor. The dimensions of the working platform are approximately 180 x 160 x 10 millimeters. Mark and drill three holes at the end of the flat-cut bed. It is necessary to tighten the platform to the bed with three bolts.

Remember that the longer the working table has, the more options you will have when choosing a technology for grinding and processing a product. If the length of the workpiece is less than or equal to the length of the work table, then you can achieve perfect grinding much easier than moving a large workpiece.

The motor must fit snugly on the bed. It should have a power of about 2.5-3.0 kW and a rpm of about 1500. If you choose a speed of the sanding belt of about 20 m / s, then the diameter of the drums should be about 200 millimeters. Thus, a gearbox is not required for the grinding machine with sufficient engine speed.

One of the two drums will play the role of a leading one, which should be rigidly fixed to the engine shaft, and the other tensioner should rotate freely around a fixed axis on bearings. The table from the side of the driven drum should have a certain bevel, which will ensure a smooth touch of the sanding belt to the surface of the working table, this is especially true for a glued joint.

You can make a tension drum and a drum that drives the sanding belt from chipboard. To do this, you need to saw blanks from a slab with an overall dimensions of 200 by 200 millimeters and assemble a package of 240 millimeters from them. Square tiles or a package of them should be folded on an axis and grinded to a diameter of about 200 millimeters.

Remember that the diameter of the drum should be 2-3 millimeters larger in the center than at the edges. With this surface geometry, the flexible sanding belt will be positioned in the middle of the drum. The optimal tape width is 200 mm. From a roll of emery cloth, which is 1 meter wide, you can easily glue 5 such tapes.

It is necessary to glue the cutting tool end-to-end, placing a thin dense material underneath, for example, a tarpaulin. It is recommended that you use the highest quality glue you can get hold of. Be sure to pull rubber on the rollers, the width of which reaches 30 millimeters. Rubber can be taken from the cameras of a moped or bicycle.

On a homemade belt sander, in addition to grinding wooden products, for which it is actually intended, it is very convenient to sharpen tools with cutting surfaces - chisels, knives, axes, secateurs. Another advantage of this grinder is the ability to work with parts that have a curved surface - for this you need to grind the workpiece with the back of the working belt.

For finishing wood, metal or stone, you can build a belt sander with your own hands. The need for such processing arises quite often. It is needed not only to obtain flat and smooth surfaces. With its help, you can remove various kinds of irregularities, bulges and depressions, peel off burrs, remove local defects, remove burr formed during welding, carry out internal grinding, etc.

Manual execution of such processing is very laborious and low-productivity, and the cost of industrial grinding machines is quite high. Therefore, you have to come up with and build homemade structures, especially since they do not differ in particular complexity.

General information about the design of belt sanders

Belt grinders, with all the apparent variety of their designs, have common distinctive features. An abrasive belt is used as a working tool in these structures. Most often it is connected in a ring and placed between two rotating drums.

Usually there are two such drums: the first is the master, and the second is the slave. The drive drum is driven by an electric motor through a mechanical transmission. This is usually a belt drive. It is desirable that there is a device that allows you to change the speed of rotation of the leading drum, thereby providing various processing modes.

The location of the sanding belt depends on the purpose of the sanding machine and can be anything: vertical, horizontal or inclined. The tape is usually mounted on the bed, and the processed products can also be located there. In homemade designs, workpieces are usually held by hand, although there may be other options.

The length of the working part of the sanding belt depends on the size of the workpieces being processed. The grinding process is accompanied by the release of a large amount of dust, therefore, an exhaust device is desirable. A tension roller is often used to adjust the degree of belt tension.

Depending on what the grinder will be mainly used for, it may have some design features. This concerns the diameter of the drums, the length and speed of the belt, its grain size, the design of the working table, etc. The main varieties of types of grinding are:

• grinding curved surfaces;
• alignment of flat surfaces;
• alignment of side edges or ends, as well as surfaces of bars, boards and similar parts;
• grinding of intermediate layers of paint and varnish coatings.

Back to the table of contents

Homemade belt sander

The design prototype for the homemade sander is a conventional industrial design, in which the belt moves the abrasive part outward over the flat surface of the worktable. The resulting grinder is distinguished from the industrial design by its increased dimensions and a stationary installation.

Since the gearbox or belt drive complicates the design, an electric motor is used, the rotor of which makes 1500 rpm. The power of the electric motor should be about 2-3 kW. With a drive shaft radius of 10 cm, the linear speed of the belt will be about 15 m / s. As already mentioned, a reducer is not needed in this case. Rotation speed control is not provided in such a simple design.

The drive shaft is rigidly mounted on the shaft of the electric motor, and the second shaft carries out tension on the tape. To reduce friction, the tension shaft rotates on bearings seated on a fixed axle. This axis can be displaced relative to the working table in one direction or the other, decreasing or increasing the degree of tension of the sanding belt.

The working table can be made of materials at hand: sheet metal or timber. Its dimensions are determined by the distance between the axes of the shafts and the length of the abrasive belt. Near the shafts, the surface of the table should have bevels to ensure smooth contact of the tape (especially its joint) with its plane.

Both drums are easy to make yourself. The material for their manufacture can be chipboard. Squares with a side of 20 cm are cut from the original plate. Their number should be such that the total thickness of the set is about 24-25 cm. Discs with a diameter of 20 cm are made of them on a lathe. There are two options for their processing:

1. You can grind each workpiece separately on the machine.
2. A more preferable option is to put the workpieces on the axle, clamp and grind them all together.

The groove should be done in such a way that the edges of the drums are a few millimeters smaller than their middle. This is to ensure that the abrasive belt is automatically positioned in the center of the drums.

You can make a very convenient, manual belt sander from a grinder with your own hands. With the help of such a tool, it is good to sharpen an ax, knives, etc. Treat the surface at any angle, giving it a flat plane. In general, those who work with iron or wood will appreciate this mini machine.
We sharpen the cutting edge of the ax:

With this sharpening, the angle will not float away.

How to make a belt sander from a grinder

The fastener for the girth of the grinder will be made of a piece of thick steel, about 10 mm thick. A hole was drilled for the neck of the angle grinder.

We saw through a wide cut.

We cut off the mount with a grinder.

Next, we clean and grind so that everything has a beautiful and safe look.

We drill a hole from the legs of the clamping device.

Then we cut the thread in the wide side.

As a result, this mount can easily be put on the Bulgarian and clamped so that everything is held tightly.

Trying on.

Now you need to make a roller that will rotate the sandpaper tape. We take a chipboard and use large-diameter nozzles to cut out round pieces. To get a wide roller, we glue them together.
Then, with a feather drill, we will drill a hole in all at once.

Then we clamp it in a vice and make an inner hole for a hexagon with a triangular file.

Like this.

We take a wide nut and make notches on the planes with a file.

They are needed to keep the nut in the tree better.

We dilute the two-component epoxy adhesive and glue the knurled nut into the wooden roller.

After the glue dries, we clamp the roller into the lathe.

Sew under the ellipse. This is necessary so that the tape does not fly off. Then we grind with emery paper until smooth.

It came to the second video. It is made of three bearings pressed onto the ow.

Let's make two such ears.

We put on the edges of the protruding shaft.

Let's weld on the plate. The result is a U-shaped piece holding the roller.

To prevent the shaft from flying out, we fix it by welding

Now let's make the frame. It will take two steel pipes of different diameters to fit one into the other.
A flat strip is welded onto a larger diameter pipe. It is needed in order to press on the belt during sanding.

We weld a roller made of bearings to a thin pipe.

We take a sandpaper ring (sold in hardware stores), insert the pipe into the pipe and estimate the approximate size of the entire device.

Saw off the long ends of the pipes. We make a wide groove in a thin pipe, and a hole in a thick one.

Weld a nut to the hole.