I decided to assemble this device to simplify cleaning the legs of radio components and other surfaces that need to be prepare for soldering.

This is actually the detail that gave me this idea:

You can get it from a Soviet cassette recorder.

Glue it to it fine-grained sandpaper:

Working part sanders ready, let's get started creating a drive. We need any motor with a shaft diameter of 1.5 mm; it will fit perfectly with the nozzle.

And a button like this:

We bend the button fastenings for subsequent fastening to the engine:

And solder it to the electric motor in any place convenient for you:

One of the button pins is also soldered to the body.

We bend one leg of the motor and close it with solder to the body:

Now we need to deal with nutrition. I used a 7 volt power adapter:

We begin to connect the adapter to the motor. We solder one contact of the adapter to the free leg of the switch, the other to the free leg of the electric motor:

That's it! The machine is ideal for cleaning solder joints and other small work. By the same principle you can do small drill using collet. If you already have a drill bit, you can leave the attachment on the original shaft and simply clamp it into the chuck.

Sanding machine made with your own hands from actually very necessary “trash”, which is in every workshop or pantry. The tool is used for final processing of parts, grinding, and rounding corners.

There are several types of such devices. The most common is a grinder with a vibration operating principle. One of its main elements is a flat sole attached to 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. This type of machine operates at a low speed, it is noisy, and your hands get tired quickly, but at the same time, such a tool is cheap and compact.

A subtype of such a device is a device with a deltoid sole, which is moved forward.

Grinding machines types and purposes

Tape devices. This machine works on a different principle. Ribbon abrasive material(sandpaper), glued into a ring, rotates on spindles. When working with it, you do not need to use much force, since the rotation of the tape is quite fast. Such machines have speed control functions, a system soft start. For more precise work, tape machines have a support frame. When operating 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 sanders. It can process almost any surface and material. This device is ideal for curved planes. It has a round platform. The rotating abrasive is attached with special clamps or Velcro. The sole of the machine performs both rotational and vibrating movements at the same time.

Angle grinders. They are electromechanical and pneumatic. Quite versatile, they can cut, grind, and clean stone and metal surfaces. The device is very similar to an angle grinder, basically it is an angle grinder, but with special circles.

Polishing machines differ from angled ones only in the polishing attachments.

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

Multifunctional sanders. They can combine several types of devices in one device, for example, vibration and tape machine, using replaceable attachments.

Do-it-yourself grinding machine video

Tools and materials for assembling a sander

• wooden blocks, metal elements for the base table;
• sheets of plywood, chipboard;
• old motor, computer hard drive, power unit;
• 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 a computer (but the circle must spin up) and an old computer power supply. If there is no home, then any repair center will sell them for pennies.

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 adjusting the speed and a switch.

A do-it-yourself angle grinder is made from an angle grinder; all you need to do is make the necessary wheel attachment from an abrasive. You can, of course, make it from scratch by choosing the required electric motor, placing it in a casing, and attaching handles. But you need to remember about the safety of working with such a tool.

Belt grinding machine, 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 belt can be placed both vertically and horizontally.

Stages of manufacturing a belt sander-machine

• Preparation;
• equip a frame base for the machine, it is rigid and stable;
• select a tabletop; the larger it is, the more large-sized parts can be processed;
• fix the racks with tension parts and rotating drums;
• fixing the engine and drums, installing an abrasive belt.

To process large parts, they do dimensional machine. To do this, take an electric motor; it is well suited for used, fairly powerful household appliances, such as a washing machine.

The frame is made from thick metal sheet.

You do not indicate the dimensions of the sheet, since in any case they depend on individual preferences and the availability of materials, maybe, for example, 500x180x30 mm, more or less. A cutout for the motor is milled into the sheet, all this is attached to the frame, required holes They are drilled for fastenings. All parts, and especially the engine, must be tightly mounted so that there is as little vibration as possible.

The motor does not need to be equipped with a gearbox if it is powerful enough. The machine is created with your own hands from two drums, one is firmly fixed on the shaft, the other is tensioned and the degree of tension can be adjusted.

The frame is created from thick wooden parts, but it is possible with metal ones. If you have the right metal and an inverter for welding, it can be welded. The support plate 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 the drums, take several sheets of chipboard, glue them together and grind them to the required diameter, make them a few mm thicker in the center, so the tape will hold well. Single row ball bearings are used for drum spindles. The abrasive belt moves along the frame on which it is mounted.

When working with wooden surface is coming to an end, a stage has begun final grinding. To perform grinding without burrs, scratches, and to beautifully round sharp corners of any part, you need to use a wood sander. This tool will help you perform professional grinding even for a beginner who picks up the machine for the first time. If you wish, you can make a grinding machine yourself, using only available tools.

The industry produces several types of machines, differing both in design and purpose. Here are the main ones:

• Eccentric or orbital, in this case the base of the tool simultaneously rotates around its axis and along a certain orbit. It turns out that each time it passes in a slightly different place, so scratches and burrs are rubbed out more and more with each pass.

• Vibration model. Here the working sole carries out reciprocating movements with a frequency of about 20,000 movements per minute. It is through these movements that grinding occurs.
• An angle grinder, which is popularly called a “grinder”. This tool is used for rough processing of parts, large logs, etc. For processing they are used abrasive wheels required grain size.
• A belt sander typically used for large surface jobs. Structurally, it consists of rollers driven by an electric motor, on which sanding tape is worn.

Making a belt sander with your own hands + (Video)

Making a belt sander yourself is not at all difficult; you need to complete the following steps:

• pick up suitable materials and details;
• create a reliable basis for securing the tool;
• install a suitable tabletop;
• secure the vertical posts with tensioner and drum;
• mount the motor and drums;
• secure with sanding tape.

To process fairly large parts and elements, it is necessary to make a large copy of a serial grinder. For example, if you take an electric motor with a power of 2 kW or more powerful with a rotor speed of 1500 rpm, then you don’t need to install a gearbox. The power of such an engine is quite enough to rotate a drum about 20 cm in diameter and process parts of about 2 m.

You can also use an electric motor from an old one washing machine. In this case, the frame is made from a thick sheet of iron, preparing a place for installing the motor and carefully securing it with bolts to eliminate vibration. The design of such a machine consists of 2 drums, one of which is fixed, and the second can be tensioned and rotates on bearings around an axis. It is advisable to make the base for the machine from metal or several sheets of thick plywood. Drums are made by lathe from chipboard. The tape is cut from webs sandpaper about 20 cm wide and fixed to the frame. The larger the table size, the larger the parts can be stacked and processed in the future. Drawings finished products can be found on the web.

https://youtu.be/vDs1gBM_MW4

Making a grinder from a grinder

Many may say that the “grinder” is the same as an angle grinder, but there are some subtleties hidden here. It should be borne in mind that the angle grinder has very high speeds and often quite a decent weight. To polish a surface with a grinder, you need to have considerable experience in this matter and use special polishing discs and circles. The grinder has much lower engine speed and weight. To operate a factory grinding machine, no specific experience or skill is required.

You can independently make a good grinder from a grinder, which is not inferior in its parameters to a factory machine, only by modifying it electrical diagram, by installing the regulator at lower speeds and by using special grinding attachments.

Making a grinder from a drill

To turn ordinary, household electric drill The grinding machine must be equipped with a special attachment - a working drum or a special support plate, depending on the task at hand.

The support or sanding pad is a plastic or rubber base with sandpaper glued on and a shank for clamping into the drill chuck. Discs with a flexible shaft are suitable for working with a loose drill, while those with a rigid shaft are best used only for a well-fixed drill.

Sanding drums for a household drill are structurally a regular cylinder, a shank and sandpaper glued to the cylinder. When using drums, the working surface of the grinder is parallel to the axis of rotation.

Making an orbital sander

Currently, you can only make an orbital machine with your own hands from a broken orbital machine. This is due to a complex device for rotating the working disk, which is quite problematic to replicate on your own. You should also keep in mind that a machine manufactured by a specialized company will not cost too much, but making it yourself will be very difficult and will take a lot of time.

Making a grinder from a computer hard drive + (Video)

Any old hard drive can be converted into a miniature grinding machine. To do this you need to complete the following steps:

• completely disassemble the hard drive and remove from the case everything that is located to the left of the magnetic disks;
• cut out a working circle from sandpaper, make a hole for the spindle in the center of the circle;
• stick several strips on the rotating disk of the hard drive double sided tape and fix sandpaper on it;
• make a protective screen to protect the eyes from the possible ejection of the manufactured sanding disc;
• connect the finished design to the power supply from the computer and use it.

Of course, this design does not have high power, but it is quite possible to sharpen a small knife or scissors.

When working with wood, the final stage of processing the material will be sanding. A grinding machine will help you with this. There are many on the market various models, but if your budget is bursting at the seams, you can make such a machine yourself.

How to make a sander

Do a simple typewriter possible from hard drive your PC. To do this, you will need the hard drive itself, an abrasive, and a PC power supply. It will be intended for working with small parts. When disassembling the disc, stick the abrasive onto the rotating plane. After this, the structure must be connected to the PSU (power supply), and then the entire structure must be secured on the working surface of the table, equipped with a speed controller and a switch.

DIY wood sander

Grinding machines are presented in the following types:

• eccentric or orbital;
• vibration;
• corner;
• tape

When making a machine you will need:

• electric motor;
• power supply.

The power unit must be taken from household appliances, for example, from a fan, the power supply - computer, battery - household. As a base for the above elements, a wooden board is suitable, onto which the battery with an electric motor should be secured with screws. The “start” button must be attached to the base with self-tapping screws. The wire strands are fixed using industrial staplers.
The working part of the tool is a grinding wheel, which you can purchase yourself. The abrasive disk will be driven by an electric motor using two bushings.
You can strengthen the design of the device if you use a motor from a washing machine as a motor. Besides polishing discs, in this case, sharpening and abrasive blades can be installed on the tool.

Homemade belt sander

The working element in this type of device is an abrasive sanding belt. A self-made machine will be stationary and have larger dimensions compared to an industrial model. To make a sample, it is best to use a power unit with a power of 2–3 kW and a rotor speed of 1500 rpm.
The radius of the drive drum directly affects the speed of the belt. The larger it is, the higher the speed of the belt. A homemade design will not allow you to regulate the speed of the belt, however, you can influence the tension force by shifting the fixed axis of the tension shaft mounted on the motor shaft relative to the work table.
The workbench for the grinding machine should be made of wood or metal. The sander belt can be made from abrasive paper, available at a hardware store.
The working element, which is the sanding belt, is driven by a transmission and drums by a power unit. Shafts are divided into driving and driven. Drums can be made using chipboard sheets, processing them on a lathe so that the processing results in disks about 20 cm in diameter. When processing, one thing should be taken into account: the edges of the shafts must have larger diameter, compared to the central part, to automatically hold the tape. The dimensions of the rack will depend on the width of the belt and the distance between the shafts. At the location of the shafts in the web, it is necessary to make slots for smooth passage of the tape.

How to make a mini grinder with your own hands

First, you need to find some foam to prepare the base for the device. After that, you need to cut a hole to install the switch in it. Then you will need electrical tape and a power source, for example, the well-known Krohn battery. We tape the battery (Crown) to the foam base with electrical tape. Take a champagne cork and a pen refill. We cut the rod to the required length, then put the handle rod on the plug with the blunt end and insert the tip of the rod into the hole for the motor shaft. After this, you need to use scissors to cut a strip of abrasive tape to fit the size of the cork. After you have cut out the tape, it should be glued to the cork around the circumference. This cork construction will be working part cars. We carefully inspect all the wires and connect them with twists, insulating the connections with electrical tape. Let's try to launch the resulting device. Now you have your own mini car. Such a device is useful for performing simple small jobs for which a conventional grinding machine would be too large and inconvenient. If you are an observant and patient, as well as diligent person, making your own sanding machine is not at all difficult. To do this, you only need deft hands and a little patience.

For finishing wood, metal or stone, you can build a belt sanding machine with your own hands. The need for such processing arises quite often. It is needed not only to obtain smooth and smooth surfaces. You can use it to remove various kinds irregularities, bulges and depressions, remove burrs, remove local defects, remove burrs formed during welding, carry out internal grinding etc.

Manual execution of such processing is very labor-intensive and low-productivity, and the cost of industrial grinding machines is quite high. That’s why we have to come up with and build homemade structures, especially since they are not particularly complex.

General information about the design of belt sanders

Belt grinders, despite the apparent diversity of their designs, have common distinctive features. An abrasive tape is used as a working tool in these designs. Most often it is connected into a ring and placed between two rotating drums.

Usually there are two such reels: the first is the leading one, and the second is the driven one. The driving drum is rotated electric motor through a mechanical transmission. This is usually a belt drive. It is desirable to have a device that allows you to change the rotation speed of the drive drum, thereby providing a variety of processing modes.

Location sanding belt depends on the purpose of the grinding machine and can be anything: vertical, horizontal or inclined. The tape is usually mounted on a frame, where the workpieces can also be placed. IN homemade structures the workpieces are usually held by hand, although there may be other variations.

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 large quantity dust, so it is advisable to have an exhaust device. To adjust the degree of belt tension, a tension roller is often used.

Depending on what the sander will be primarily used for, it may have some design features. This applies to the diameter of the drums, the length and speed of the belt, its grain size, the design of the work table, etc. The main types of grinding are:

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

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Homemade belt sander

A constructive prototype of a homemade grinding machine served as a regular one industrial design, in which the belt moves with the abrasive part outward over the flat surface of the work table. The resulting sander is distinguished from the industrial design by its increased dimensions and stationary installation.

Since a 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 linear speed The belt movement will be about 15 m/s. As already mentioned, a gearbox is not needed in this case. There is no provision for adjusting the rotation speed in such a simple design.

The drive shaft is rigidly mounted on the electric motor shaft, and the second shaft tensions the belt. To reduce friction, the tension shaft rotates on bearings sitting on a fixed axis. This axis can be shifted relative to the work table in one direction or another, decreasing or increasing the degree of tension of the sanding belt.

The desktop can be made from scrap materials: sheet metal or wooden beam. Its dimensions are determined by the distance between the axes of the shafts and the length of the abrasive belt. Near the shafts, the table surface 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 slab. Their number should be such that the total thickness of the set is about 24-25 cm. Disks with a diameter of 20 cm are made from them on a lathe. There are two options for processing them:

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

The groove should be carried out in such a way that the edges of the drums are several millimeters smaller than their middle. This is necessary so that the abrasive belt is automatically installed in the centers of the drums.