Do-it-yourself belt sander. Wood grinder: making your own hands DIY wood belt sander

A do-it-yourself grinder is made from really very necessary “junk” that is in every workshop or pantry. The tool is used for final processing of parts, grinding, rounding corners.

There are several types of such a device. The most common is a grinder with a vibration principle of operation. One of its main elements is a flat sole fixed on the base. It transmits movement from the motor to the abrasive surface. The harder you press the device, the more powerful the vibration movements will be. Such a machine has a low speed, it is noisy, hands get tired quickly with it, but at the same time, such a tool is cheap and compact.

A subspecies of such a device is a device with a deltoid sole, which is brought forward.

Grinding machines types and purpose

Tape devices. Such a machine works on a different principle. A tape of abrasive material (sandpaper), glued into a ring, rotates on spindles. When working with it, you do not need to apply great efforts, since the rotation of the tape is quite fast. Such machines have speed control functions, a soft start system. For more precise work, tape machines have a support frame. When working with such a tool, a lot of dust arises, so they often have a dust collector or the ability to connect to a vacuum cleaner. Various attachments can be attached to the spindles.

eccentric device. This is the most versatile type among grinders. It can process almost any surface and materials. For curved planes, such a device is ideal. It has a round platform. The rotating abrasive is fastened with special clips or Velcro. The sole of the machine performs both rotational and vibrating movements at the same time.

Angle grinders. They are electromechanical and pneumatic. They are quite versatile, they can cut, grind, clean surfaces made of stone, metals. The device is very similar to the grinder, basically it is the grinder, but with special circles.

Polishing machines differ from angle polishers only with polishing nozzles.

Straight grinders perform fine work with high precision. The spindle is parallel to the frame, like the shaft of a pen. Such machines are small in weight and size, they can be manipulated with one hand. Their main purpose is the grinding of corners, the processing of edges and small planes, such as planks and lintels. They look like a thick pen, they are used to engrave, cut and polish small objects.

Multifunctional grinders. They can combine several types of devices in one device, for example, a vibrating and tape machine, using replaceable nozzles.

DIY grinder video

Tools and materials for assembling a grinder

wooden bars, metal elements for the base table;
sheets of plywood, chipboard;
old motor, computer hard drive, power supply;
bolts, screws, bearings, self-tapping screws;
screwdriver, screwdrivers, drill;
spring, steel, metal, textolite plate;
welding inverter, if such work will be carried out;
abrasive tape, circle, glue.

Making a grinder from a hard drive

Now it's not a problem to get a broken hard drive from the computer (but the circle should spin up) and an old computer power supply. If there is no house, then at any repair point they will be sold for a penny.

Such a device will be oversized, for small parts. It is done simply: the disk is disassembled, an abrasive is glued onto the rotating plane, connected to the power supply - the device is ready. It must be mounted on a workbench for stability, it can be equipped with a regulator, a servo tester for speed control and a switch.

Do-it-yourself angle grinder is made from a grinder, it is enough to make the necessary nozzle-circle from an abrasive. You can, of course, make it from scratch by selecting the necessary electric motor, placing it in a casing, attaching handles. But you need to remember about the safety of working with such a tool.

Belt grinder machine. Such devices consist of:

working body: abrasive, two drums, leading and driven. There may be more drums in the machine;
electric motor;
casing, machine base, frame, table.

The do-it-yourself machine is equipped with a speed change function, the tape can be placed both vertically and horizontally.

Stages of manufacturing a grinder-machine of a tape device

preparation;
equip the base-frame for the machine, it is rigid and stable;
pick up the countertop, the larger it is, the larger parts can be processed;
fix racks with tension parts and rotating drums;
fixing the engine and drums, installing an abrasive belt.

To process large parts, they make an overall machine. To do this, they take an electric motor, which is well suited from old, sufficiently powerful household appliances, such as a washing machine.

The bed is made from a thick metal sheet.

Do not indicate the dimensions of the sheet, since in any case they come from individual preferences and the availability of materials, it can be, for example, 500x180x30 mm, more or less. A cutout for the motor is milled in the sheet, all this is attached to the bed, the necessary holes for the fasteners are drilled. All parts, and especially the engine, must be tightly fastened so that there is as little vibration as possible.

The motor can not be equipped with a gearbox if it is powerful enough. The do-it-yourself machine is created from two drums, one is firmly fixed on the shaft, the other is tensioned with it, you can adjust the degree of tension.

The frame is created from thick wooden parts, but it is possible from metal ones. If there is a suitable metal and an inverter for welding, it can be welded. The plate for the support is made from thick plywood, I take several sheets, textolite is also suitable.

The second shaft is beveled, so the tape will smoothly touch the table. For drums, several sheets of chipboard are taken, they are glued and turned to the required diameter, in the center they are made several mm thicker, so the tape will hold well. Single row ball bearings are used for drum spindles. The abrasive belt makes its movement along the frame on which it is attached.

There are many uses for a homemade grinder in the household. We are talking not only about a private house or a personal plot, but also about housing in an apartment building. It can be used to treat any surface. The degree of cleaning depends on the type and abrasive materials used. Unlike industrial models, a do-it-yourself device will compare favorably in cost, since the construction budget will depend only on the master. With locksmith skills and basic knowledge in electrical matters, you can easily assemble the device yourself.

Without a thorough knowledge of the design of grinders, it is impossible to assemble a high-quality device with your own hands. Before moving on to the structure, let's get acquainted with the most common types of grinders:

Corner. In other words, Bulgarian. Disks are consumables. Grinding wheels are designed for surface grinding. Pressure adjustment is carried out manually.
Tape. Surface treatment is carried out with a sanding belt. Suitable for work on flat surfaces only.
Delta grinder. For processing products with a curvilinear structure.
Vibrating. Ideal for finishing flat surfaces.

In addition to the above, there are several more devices that are less common:

straight;
polishing;
eccentric.

Regardless of whether the device is factory-made or self-assembled, the main structural elements are:

Drive unit. The performance of the device depends on its power. In do-it-yourself devices, an electric type drive is used, however, there are pneumatic homemade products powered by a compressor.
Reducer. Transmits torque from the drive to the working tool. The basic part of the gearbox is the spindle.

The gearbox is an integral part of tools such as a grinder or a drill. Some models, especially those assembled with their own hands, do without it.

Working platform. An abrasive material is attached to it. To do this, you can use circles, tapes, disks.
Frame. Protects the structure from mechanical damage and dust, so many factory models are equipped with dust collection systems. The materials used to make the device with your own hands, as a rule, are not able to compete with high-quality polymers that are used in the manufacture of professional tools.
Control system. Includes power off, as well as adjusting the speed of the abrasive.

Options for homemade designs

Making a grinder with your own hands is easy. The main thing is that it should correspond to the types of work that the master plans to perform. From an economic point of view, it is better to take the components that are at hand. If you have to buy the components of the device, then the budget of a do-it-yourself device will be comparable to the factory model. Ceteris paribus, it is better to give preference to an industrial tool, because its quality is incommensurably higher.

Consider a few handmade devices. Perhaps one of them is right for you.

Do-it-yourself grinder from a grinder

As the name implies, the grinder is designed for grinding. Cleaning discs successfully cope with rough work: removing old paint, removing metal deposits or traces of corrosion. For finer cleaning, special nozzles are sold from an emery sheet of various grain sizes.

Models for domestic use operate in one mode, and the number of revolutions reaches 15 thousand per minute with an average of 11 thousand. This speed is great for sawing materials, but for grinding work it is high.

The grinder motor has excess power. For polishing, 300-400 watts will be enough.

A grinder from a grinder will have a lot of weight compared to a factory tool, but it is possible to adapt the homemade product for yourself, which will increase comfort when grinding.

For angle grinders, you can make a simple nozzle that will turn the device into a miniature one. In this case, work is performed without a protective cover.

If you do not want to use fixtures, you can adjust the number of engine revolutions. Independent modernization of the circuit will require specialized knowledge in electrical engineering.

On professional devices, you can set the number of revolutions manually, however, their cost starts from $ 200.

We make a grinder from a drill

From a drill with your own hands, you can assemble a productive belt grinder. In this case, the tool acts as a drive. The design itself is simple and does not require significant investments. To make your own, you will need the following materials:

metal rods with and without thread;
profile pipe;
plywood;
steel sheet;
bearings;
hardware;
wood glue.

You should take care of the availability of metalwork tools, an inverter and devices for sawing metal.

Stages of work:

Pulley manufacturing. The driving and driven pulleys are designed to transmit torque from the drill to the grinder. They are made from plywood.
By changing the diameter, you can get the desired torque. One pulley consists of several round timbers, which are connected with wood glue. In the center, it is necessary to drill holes for steel bars. After the glue dries, the workpieces are finalized by making a groove, which must correspond to the width of the drive belt.
Manufacture of driving and driven shafts. They are also made of plywood by analogy with pulleys. For them, more rounds should be prepared.
We collect the lower part. To do this, you need a profile pipe. First of all, it is necessary to mount the bearings and connect them. This is the basis for the working shaft.
We make the top. A tension mechanism will be attached to it.
We make the thrust part of the steel sheet.
Drive installation. Please note: for normal work, it is better to take a powerful drill.
Finishing work. It remains only to install the pulleys, tighten the drive belt and assemble the protection. After that, the do-it-yourself device must be coated with paint.

For small and precise work, it is better to purchase compact nozzles of drum or plate type, depending on the type of work.

Homemade grinder from a computer hard drive

From an old hard disk, you can assemble a small grinding device, the main advantage of which will be the complete absence of investments, except for the cost of abrasive wheels. The DIY process is as follows:

We open the case and remove all the elements located next to the magnetic disk.
According to the size of the upper part of the drive, cut out a circle of sandpaper of the desired grain size.
Using double-sided tape, we fix the paper on the surface of the disk.
We manufacture a casing that protects against dust or abrasive grains.
To start the design, the hard drive must be connected to the computer's power supply.

Such a do-it-yourself device will allow you to perform minor work, such as grinding contacts, sharpening nail files or tweezers. The rotation speed depends on the factory settings. The average value is 7200 rpm.

A DIY sander won't have the attractive look of a factory tool, but good performance and low assembly costs make up for that.

Have you tried assembling a grinder with your own hands? What was used as a drive? Share your invention experience in the comments.

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 to do when finances do not allow you to make 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 variety of industrial organizations. Wood is used to make many kinds of details and products. 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 is usually used in the final stages of production, when the parts are subjected to fine machining. Such devices are convenient to use in the manufacture of furniture and various consumer wood products. Depending on the material used, belt sanders work with wood or metal.

The main goals of using grinders for wood are the final leveling of the surface, bringing their level of roughness to the required level, obtaining even and smooth surfaces for 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 varnish and primer deposits, deburring, internal grinding and grinding of roundings.

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

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

for sanding curved surfaces with free sanding belt;
for processing a flat surface with a fixed table, manual movement of the iron and table, as well as mechanized movement of the work table and manual movement of the iron;
for processing panel and bar parts, their ends and side edges;
for intermediate sanding of paint and varnish coatings.

The design of the belt sander

Belt grinding machines 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 into a ring and placed between rotating drums.

One drum is the leader 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, through which torque is transmitted to it from an electric motor. Any belt grinder is designed so that the speed 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 a bed, on which the workpieces are usually located. Workpieces can be held manually by the operator, or with the help of special devices that facilitate the work of users 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 precisely from metal, then it will turn out to sharpen more complex products. The length of the working part of the belt grinder and the grinding belt itself primarily depends on the length of the products that will be sanded 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 turn out to be of better quality. For example, with a sanding belt length of 4.5 meters, wooden blanks can be easily processed, which have a length of 200 centimeters.

Belt grinding machines 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 also a feed organ. On machines with tables, the tape is placed horizontally, on designs with a 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 reaches 20 meters per second.

Abrasive belts for grinding machines

The cutting tool of belt grinders 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 produced by two methods: mechanical and electrical. The first method consists in uniformly pouring abrasive grains onto a base that is covered with glue, and the second method occurs in an electric field that orients the grains upwards with the sharpest edges to improve the cutting properties of the grinder.

Abrasive grains are poured onto the base in a bundle densely or rarely. The most effective is an abrasive belt with a rare filling, when the grains occupy less than 70% of the area, because the wood dust generated during the grinding process is not able to clog between their grains. Natural minerals or artificial materials that have high hardness, such as green and black silicon carbide, white and normal monocorundum, and normal electrocorundum, can be used as abrasive material.

For the purpose of gluing the grains, synthetic resins and skin glue are used. As a base, use a fabric such as calico and twill, or a special grade of paper. The size of the abrasive grains is indicated by a number that corresponds to the size of the meshes 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.

Sanding paper is supplied to woodworking enterprises 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 strips 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 at a 45 degree butt joint and then glued onto a linen backing 80 to 200 millimeters wide. At one end of the tape, when gluing the overlap, the abrasive grains are removed with hot water over a distance of 80 to 100 millimeters, then the other end of the tape is applied to the bare base smeared with glue. Compress the connected ends and dry them using a special tool or size press.

Sheet skins are used for combined belt sanders. For grinding discs, it is customary to cut the skin in the form of a circle according to a pattern, the diameter of which is 60 - 80 millimeters larger than the diameter of the disc. Using a rectangular template, blanks are cut out for a bobbin. After cutting, they have smooth edges without tearing. The presence of unglued 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 that is made of plywood or aluminum sheet. The skin is cut in such a way that the edges are even, and the difference in the length of the side edges is no more than 1 millimeter. One of the beveled edges is cleaned, removing the abrasive at a width of 20 millimeters. The cleaned 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 keep it in the air, depending on the viscosity and type of glue. Then the beveled edges are connected and a strip of skin is applied to the junction, the junction is compressed and held in a press. Ready-made endless tapes are usually hung on special brackets and kept for at least a day in a dry room before being installed on a grinding machine.

The principle of operation of the belt grinder

The belt sander consists of a worktop with a working 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 with a thickness of 25 millimeters. The working table on rollers moves manually or in the transverse direction by means of a mechanical drive on round guides that are attached to the calipers.

Above the table is a working tape, put on non-drive and drive pulleys. The sanding belt is tensioned and adjusted using a screw device with a pneumatic cylinder. Twin belt sanders have two identical sanding tools that are placed in series on the bed and have sanding belts that run 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 tape against the material being processed. Sanding belts are driven by an electric motor through a belt drive. Waste that is generated during grinding is captured by a dust collector, which is connected to the exhauster 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 skin, the feed rate and the force of pressing the tape to the product. It is customary to choose the grain size of the skin, depending on the hardness of the processed materials and the required surface roughness. Clamping force and feed rate are interdependent quantities. With a small effort and a high feed rate of the skin, some places on the surface can not be sanded, with high pressure and low feed, burns and blackening of the material are possible.

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

The belt tension can be adjusted by moving the tension roller for the belt grinder or the non-drive pulley. It is not advisable to stretch the tape too much, because this leads to its rupture. But the sanding belt slips over the pulleys at low tension and heats up very quickly. The tension force is set depending on the strength of the base of the cutting tool and is determined by the arrow of its deflection with a slight pressure on it.

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

The manual feed belt sander can serve one worker. By moving the product relative to the cutting tool in the longitudinal direction, and turning the part around the axis, the operator sequentially brings into contact with the tape all the sections that form the surface to be machined. When slowing down or moving carelessly, grinding may form.

It is customary to grind individual parts of the part in several passes. It is possible to achieve high-quality alignment with the correct regulation of the pressure that is exerted on the ironing handle, and the speed of movement of the table and ironing. The pressure when approaching the edges must be reduced to prevent their grinding off. To increase the quality and productivity of grinding, small bars 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 directs the product under the clamping elements of the machine. Parts must not be moved sideways when being picked up by the conveyor.

It is not allowed to feed into the machine blanks that have an unequal thickness, and parts with gross surface defects. The feed rate and pressure of the clamping beam, as a rule, are not regulated during processing. The second operator takes care of receiving the finished parts and ensures that there is no unacceptable chamfering or grinding.

Production of a belt sander

The price of belt grinders from an industrial manufacturer is quite high, so when they are used infrequently, 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 frame, rollers and engine.

The engine can be removed from an old washing machine. Cut out the bed from 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 a motor. Dimensions of the working platform - approximately 180 by 160 by 10 millimeters. Make a markup and drill three holes in the end face of a flat-cut bed. It is necessary to pull the platform to the frame with three bolts.

Remember that the longer the desktop is, the more options you will get when choosing a technological method for grinding and processing the 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 when moving a large workpiece.

The engine must be tightly placed on the frame. It should have a power of about 2.5-3.0 kW and a speed of about 1500 revolutions per minute. If you choose a speed of about 20 m/s for the sanding belt, then the diameter of the drums should be about 200 millimeters. Thus, with sufficient engine speeds, a gearbox for a grinding machine is not required.

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

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

Remember that in the center the diameter of the drum should be 2-3 millimeters larger than at the edges. With such a surface geometry, the flexible sanding belt will be located in the middle of the drum. The optimal width of the tape is an indicator of 200 millimeters. From a roll of emery cloth, which has a width of 1 meter, it is easy to glue 5 similar tapes.

It is necessary to glue the cutting tool end-to-end, placing a thin dense material from below, for example, a tarpaulin. Glue is recommended to use the highest quality that you can get. On the rollers, without fail, stretch the rubber, the width of which reaches 30 millimeters. Rubber can be taken from the cameras of a moped or bicycle.

On a home-made belt grinder, 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 reverse side of the working belt.

Sanding is one of the methods of processing wood, which allows you to give the blanks a perfectly flat surface. A versatile wood sander will be functional and easy to use. For processing lumber, you can use units manufactured by specialized manufacturers, or you can make such equipment yourself, which will save a lot.

Types of woodworking machines

Currently, there are numerous types of grinders that are designed to perform various kinds of work with wood. They differ in their design, intended for domestic and industrial use. You can easily pick up both highly specialized models and universal machines that are designed for complex wood processing.

If necessary, you can make a home-made grinder for metal or wood, made on the basis of a drill, a motor from a washing machine, or using other equipment.

Disc units

The working surface of do-it-yourself grinding machines for metal and wood is made in the form of an island metal disk, on which an abrasive is attached. Due to its simplicity of design and versatility of use, this type of equipment has gained wide popularity in the market today.

This machine consists of an electric motor, on the axis of which a circle with a fixed working surface is put on. Abrasive nozzles and sanding paper are attached to the working axis, which allows processing wooden blanks. Despite the simplicity of design, such machines are versatile in use, they can perform high-quality wood processing, giving the workpieces a perfectly flat and smooth surface.

The advantages of surface grinding technology include:

Versatility of use.
Efficiency.
Reliability.
Simplicity of design.

A feature of this type of equipment is the ability to adjust the speed of processing wooden blanks without changing the indicator of the number of revolutions of the working element. When working with such a machine, you can move the workpiece along the radius of the circle, which allows you to change the intensity of processing products. On the periphery of the disk, the linear speed will be higher, which can significantly speed up and simplify the processing of wood. But inside the circle, where the linear speed is lower, final sanding is performed with the removal of the thinnest layer of wood.

Belt plants

Belt sanders have two shafts between which a continuous belt of sandpaper is stretched. Processing of blanks is carried out by exposing them to sandpaper, which removes thin chips from wooden blanks, giving them a perfectly flat, smooth surface. The working surface of disc machines can be vertical and horizontal, while some models allow you to change the direction of the tape. With the help of such equipment, it is possible to process products of great length, aligning their ends. The simplicity of the design allows you to make a belt grinder for domestic use with your own hands.

drum models

The main purpose of this type of units is horizontal alignment using a jointer. This type of equipment is mainly used in industrial workshops, which is explained by the complexity of its design and the narrow specialization of drum units. With the help of grinding drum machines, wooden products of the same type with the same thickness are manufactured and processed.

Manufacturing of grinding machines

Industrially manufactured machines offered today in specialized stores are distinguished by their versatility in use, functionality and efficiency. Their only drawback is their high cost., therefore, if it is necessary to perform various kinds of grinding work, most homeowners decide to manufacture home-made equipment, which, in terms of its parameters and quality of processing, is practically not inferior to factory units.

A structurally made do-it-yourself metal grinding machine will consist of the following components:

Metal or wooden frame.
Electrical engine.
Drive shaft.
Working surface.
Sanding belt.

When making a drum sander for wood with your own hands, you need to determine the power of the electric motor used. It is recommended to choose electric motors that develop about 3 kW and are able to maintain a clean speed of 1,500 rpm. On the basis of such a drive, a functional, durable and reliable grinding machine can be made that can handle the processing of wooden products. The easiest way is to make such equipment based on an electric motor from an old washing machine.

The grinder bed can be made of lumber or a metal corner, welded and additionally sheathed with plywood. It is necessary to choose the dimensions of the bed based on the dimensions of the drive used, as well as the dimensions of the wooden blanks processed on the unit. When making a bed, it is necessary to focus on the available design documentation, which will allow you to properly manufacture the bearing base of the machine, which in the future will be able to withstand significant loads.

The shaft of the manual and automatic belt grinding machine, which is directly connected to the electric motor, can be machined on a lathe or ready-made blanks from industrial equipment can be used. The shafts of the calibrating drum grinder must be located strictly in the middle of the main drive, which subsequently guarantees high-quality processing of wooden blanks.

The optimal width of the sanding belt used will be 200 millimeters. It can be done from emery, which is cut into strips and subsequently the used abrasive tape is already glued from them. The material should be glued end-to-end, and dense matter is placed on the reverse side, which will ensure the strength of the seam.

Having made a grinder with your own hands, you can significantly simplify the processing of wooden blanks, leveling boards and removing chips from lumber. Making such a unit with your own hands is not difficult. On the Internet, it will be necessary to select a diagram-drawing for the manufacture of the machine, and using an electric motor from an old washing machine, make the simplest equipment, which in terms of functionality and quality of processing will not be inferior to factory-made equipment.

You can make a very convenient, manual belt grinder 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.
Sharpening the cutting edge of the ax:

With such sharpening, the corner will not float away.

How to make a belt grinder from a grinder

The mount for the girth of the grinder will be made of a piece of thick steel, about 10 mm thick. We drill a hole for the neck of the angle grinder.

We cut a wide slot.

We cut the mount with a grinder.

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

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 be easily put on the grinder 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, using nozzles of large diameters, we cut round pieces. To get a wide round roller, glue them together.
Then, with a pen drill, we drill a hole in all at once.

Then we clamp it in a vise and with a triangular file we make an internal hole for the hexagon.

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 breed a two-component epoxy adhesive and glue the knurled nut into a wooden roller.

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

We sew under an ellipse. This is necessary so that the tape does not fly off. Then sand with sandpaper until smooth.

It's time for the second video. It is made of three bearings pressed on vl.

Let's make two such ears.

Let's dress on the edges of the protruding shaft.

Let's make a plate. The result is a U-shaped part holding the roller.

So that the shaft does not fly out, we fix it by welding

Now let's make a frame. You will need two steel pipes of different diameters so that one enters the other.
A flat overlay is welded onto a pipe of a larger diameter. It is needed in order to press on the tape during grinding.