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A grinder is a special grinding device that has an electric drive and an abrasive-coated belt. This device is used for finishing metal, wood, and polymer surfaces. The main thing you need to pay attention to when assembling a grinder with your own hands: drawings with dimensions, stages of work, selection of suitable materials.

The grinder allows you to grind products made of wood, plastic, metal, as well as process any surfaces

Do-it-yourself belt sander: operating principle

A distinctive feature of this device is that it has a simple design that anyone can replicate at home. This grinding unit includes an electric motor, rollers and the working tool itself – a belt with an abrasive coating. The strip may have different grain sizes. This indicator is selected in accordance with the purpose of the instrument.

The grinder, unlike the usual stationary machine, is a more versatile tool

When assembling a grinder with your own hands at home, you should prepare and study the principle of its operation. When the unit is turned on, the engine starts. It has a shaft that connects to the main (drive) roller. The roller begins to rotate around its axis, acting through the abrasive belt on the secondary (driven) rollers.

Sanding is quite simple when the device is turned on. To do this, you need to attach the workpiece to a moving abrasive belt. During work, you need to focus on the position of the working strip.

A self-made grinding machine will allow you to process workpieces made of different materials. Such a unit has the ability to eliminate defects on the surface of metal, wood, and glass. Using grinders, rollers are often adjusted, which makes it possible to process defects of different depths.

It is worth remembering that with prolonged use, the sanding strip wears out, which leads to its stretching. In such units this problem is solved very simply. One of the device's rollers contains a special mechanism that allows you to tension the tape. Most often, such a device is installed on a roller located between the main and secondary roller of the device.

A grinder can be used to easily remove rust from the surface and sharpen a knife.

Features of the DIY grinder design: photo

It is recommended to take into account all the design nuances of factory devices. This will allow us to produce the most efficient tabletop grinding machine. The standard equipment of this type of device includes a support table. In addition to its main purpose, this surface performs another auxiliary function: it is used to fix the workpiece being processed.

In factory devices, such a table can be rotated about one axis. The rotation angle is usually 90°. This makes it possible to grind two planes of the workpiece (located perpendicularly) without changing the position of the part fixed on the rotating surface. When assembling a simple grinder with your own hands, you can make a static table. This will greatly simplify assembly, but the finished unit will have less functionality.

There are other, equally important parts that are included in the design of such machines. Let's consider what other structural elements any grinder used for grinding workpieces made of different materials must have:

• skating rinks;
• base;

The main task in making a grinder is to find a powerful motor that will need to be equipped with a drive

• ribbon;
• tension mechanism;
• protective wall.

All these parts are quite easy to make with your own hands. The belt sander may produce dust or sparks during operation. This depends on the material of the part processed on such a machine. Because of this, experienced professionals strongly recommend using special glasses. In addition, it is recommended to organize a protective wall, for the manufacture of which acrylic glass is used.

Portable units are equipped with a housing made of steel. The grinder stand must have holes that are necessary to fix the machine on a wooden surface (using bolts). When choosing a tape, it is worth considering that its length depends on the power of the unit (and vice versa). The higher this indicator, the correspondingly more powerful the drive should be.

How to make a grinder with your own hands: assembly rules

Before you start independently constructing a grinding unit of this type, you must carefully study the sequence of actions and also take into account some rules. The first and most important step is preparing to assemble the grinder. Let's consider what actions this item includes.

A drawing with the dimensions of the grinder is an important document on which the performance and technical characteristics of the unit will depend

The first step is to draw up a suitable drawing. It should be remembered that the circuit must correspond to specific operating conditions. You can draw up the drawing yourself. The second option is to download the finished circuit from the Internet. On specialized websites and forums you can find many modifications of such devices, the design of which is most suitable for home assembly.

The more detailed the drawing, the better. The diagram must contain a detailed description of all individual structural elements with their dimensions. A drawing with dimensions is a very important document on which the performance and technical characteristics of the future machine will depend. Therefore, it is worth approaching its preparation with all seriousness.

You can make different versions of grinding grinders yourself. In addition to stationary devices, there are also simpler types (for example, a do-it-yourself grinder made from an angle grinder). A drawing and video for assembling such a device can also be easily found on the World Wide Web.

The next point worth considering is preparing all the necessary parts and tools for assembling the unit. To construct a grinder at home, you will need the following equipment:

• jigsaw;

In order to make a grinder, you need to understand the principle of operation of the machine

• drill;
• Bulgarian.

Note! When selecting tools, it is necessary to take into account that the design of the grinder involves the use of metal parts, as well as their processing.

Many parts of this grinding equipment are difficult to make for a beginner. Therefore, it is recommended to study in detail the various structural elements and their features. It also wouldn’t hurt to look at the drawings and videos. Making a grinder with your own hands is much easier if you have the opportunity to consult with a qualified craftsman who can give valuable recommendations on this issue.

Some structural elements cannot be created with your own hands without the use of turning equipment. You don't have to do this kind of work yourself. To perform complex parts, you can use the services of a professional turner.

When making a grinder with your own hands, it is advisable to take into account one more important point. The most effective are devices that can be used to process not only horizontal, but also vertical surfaces. Experts recommend choosing a drawing that allows you to grind workpieces at different angles.

You can make different types of grinding grinders with your own hands.

Do-it-yourself grinder: drawings with dimensions of structural elements

The development of an appropriate scheme is the most important preparatory stage. The drawing can be ordered from a qualified craftsman. In this case, it will be as accurate as possible and will allow us to produce equipment that will last for many years.

How to make a grinder with your own hands? Drawings, videos, as well as photos of grinders at various stages of assembly - all this makes it possible to independently produce a high-quality unit.

The second option is to download the diagram from the World Wide Web. In this case, it is worth knowing that some drawings located on the Internet are not effective. Therefore, before downloading this or that diagram, it is recommended to read the reviews of real people who have already used it to assemble belt grinding equipment.

It is also recommended to compare the diagram drawn up yourself with other drawings with the dimensions of the grinder yourself. Videos with relevant topics allow you to quickly understand all the nuances of manufacturing such a unit. There are a huge number of them on the Internet.

In order for the machine to serve for a long time, you need to order a drawing of the grinder from a qualified craftsman

The diagram must be accurate and contain sketches of all structural elements of the structure. The dimensions of individual parts must be indicated. And finally, you can post the finished diagram on a specialized forum and ask what inaccuracies it contains. It is possible that in this case it will be possible to obtain valuable advice on its improvement.

Do-it-yourself homemade grinder machine: choosing a suitable drive

Before you begin assembling such a grinding unit, you need to prepare a suitable motor. Most often, a drive with a power of at least 1 kW is used for these purposes. There are several factors to consider when choosing an engine. Let's look at them in more detail.

First of all, you need to understand that devices that operate on a standard network are suitable for use at home. The voltage in such a network is traditionally 220 V. Higher voltage is necessary for the use of professional equipment, which is found in small enterprises, but not for a home-made device. The grinder grinder must be created in accordance with a pre-prepared drawing.

Another important point is the number of drive revolutions. The accuracy of workpiece processing depends on this parameter. A certain pattern can be traced here. The higher the engine power, the more revolutions it can produce.

For a grinder, a drive with a power of at least 1 kW is most often used

The most suitable drive option includes special blades in its design. Their function is to neutralize overheating that occurs during engine operation. It is easy to make such a device yourself in a home workshop.

Most often, a simple motor from a washing machine is used to assemble such grinding equipment. A do-it-yourself grinder of this type fully meets all operational requirements and is used for processing small workpieces made of metal, wood, and plastic.

Features of making a grinder from a washing machine with your own hands

The engine power is selected depending on the size of other structural elements. First of all, this concerns the dimensions of the main (drive) pulley. If the size of this element is the standard 150 mm, then you need an engine with power that can produce up to 3000 rpm.

Of course, you can purchase a ready-made engine, but this will cost extra money. The best option for assembly at home is to use an unnecessary motor from a washing machine. The grinder, which is based on such a device, is certainly not able to compare with the factory one, but it is quite suitable for simple everyday work.

To make a grinder, you can use a regular commutator motor from an old washing machine

The motor, removed from an old automatic washing machine, has low power (below 300 W). It is distinguished by good reliability and is unpretentious in operation. The popularity of using just such a drive is due to its wide distribution.

Related article:

Belt grinder: a simple device for grinding and sharpening

Advantages and disadvantages. Types of grinders. Design and principle of operation. Recommendations for the selection and use of a belt sanding unit.

The drive from the washing machine must be included in the preliminary drawing. A do-it-yourself grinder at home requires a motor with an output shaft. In this case, the shaft has a threaded connection, the design of which allows it to be connected to the pulley without much difficulty.

Note! For assembling grinding units, engines not only from old automatic machines are suitable, but also new generation drives. When using devices of the second type, you must remember that they need a device that will regulate the speed. This is due to the fact that the maximum rotation speed of such drives can reach up to 18 thousand rpm.

New generation drives have one significant drawback. With the active use of grinding equipment, quite rapid wear of the motor brushes occurs.

The grinder, which is based on a motor from a washing machine, cannot compare with the factory unit

When constructing a grinder with your own hands from a washing machine engine, you must also take into account that such a drive is best suited for a small unit. Therefore, it is worth choosing in advance the optimal dimensions of the leading and secondary rollers.

Making grinder rollers with your own hands: drawings

Designing rollers for a grinding unit of this type is a serious step that requires care and precision. One of the most important elements of a grinder is the main skating rink. It must be remembered that its dimensions must be larger than the dimensions of the remaining rollers.

It is no coincidence that the leading roller has similar geometric parameters. Such dimensions allow you to avoid unwanted jerk that occurs during the starting moment. It is also important to understand that for the manufacture of this structural element, in no case should you use materials that have a large mass. Such materials include:

• steel;
• cast iron.

Before you start creating the rollers, you need to prepare the appropriate drawings with dimensions. A do-it-yourself belt grinder should have light and convenient rollers of small dimensions. As a rule, this is quite enough to carry out simple sanding work.

When assembling the grinder yourself, it is important to place the rollers perpendicular to each other to avoid belt distortions

To reduce the weight of the drive roller, a steel part with a cavity can be designed. There are special reference books that allow you to carry out the calculations necessary for this procedure.

The second option, which is most often used by home craftsmen, is the use of duralumin. This material is lightweight and ideal for this purpose. It contains impurities of copper and magnesium, which provide increased strength to the alloy. To assemble the grinder, it is customary to use duralumin grade D16 and higher.

How to make grinder rollers with your own hands? Experts recommend making a groove on the pulley located at the end. Its dimensions are selected taking into account the size of the abrasive belt that will be used in the machine. This measure is aimed at preventing the tape from falling off during equipment operation. It is advisable to do the same manipulation with the remaining rollers.

The degree of roughness of the rollers is very important. The surface of the rollers may have different levels of roughness. When assembling a grinder, it is recommended to use rollers in which this indicator ranges from 1.25 to 2.5. A table containing information on the degree of roughness of parts can be easily found on the Internet. The pulley for the grinder is mounted on the equipment with your own hands using bearing units.

Duralumin is often used to make grinder rollers.

In this case, closed type bearings are used, which have a static outer ring and are classified as self-aligning. Installing such elements eliminates the possibility of abrasive or any other foreign particles getting onto the roller shaft.

When choosing bearings, it is necessary to take into account their load-bearing parameters. These indicators determine how much load the part can withstand. The higher the unit speed, the more reliable the bearings should be. During work, it is not recommended to deviate from the dimensional drawings. A belt grinder made in accordance with the scheme will be characterized by higher efficiency, as well as a long service life.

How to fix the video in the device? The easiest way to secure the roller at home is to use standard cotter pins. Another fastening option is to use a collar (at one end of the axle).

Manufacturing process

For the manufacture of power parts of the machine, it is necessary to use sheet metal 10 mm thick. To draw the contours of such parts for their further cutting, you can refer to the drawing. There is no need to follow the dimensions exactly, since only the dimensions of the parts that you are going to process on the belt grinder will depend on them. You can draw the outlines of the parts on a sheet of metal with a marker, and use a grinder and a jigsaw to cut them out. It is much easier to cut out such parts using a plasma cutter, but not everyone has such equipment at home.

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Base, machine body parts and engine before assembly

To make the base of your homemade grinder more reliable, it is better to use a 12 mm thick sheet of metal for its manufacture. You can use screw connections to assemble the grinder base, but then you will have to drill a lot of holes, which will significantly weaken the entire structure. It will be much easier and more reliable to assemble the base of your machine using electric welding.

The semicircular grooves on the parts of the belt grinder, which ensure the rotation of the platform on which the rollers are placed, will require a lot of time. To make such grooves yourself, you will need to tinker with a drill, cutters and a file, and also use a drill. You can make your task much easier if you entrust the making of such grooves to a qualified milling machine operator.

Model of the machine made of plastic: thanks to the rotating unit, the grinder can be in a vertical position...

To make the rollers of your homemade mini-machine, it is best to use titanium or duralumin (D16). If it is not possible to find blanks made from these materials, then steel can also be used, but then the rollers must be made as light as possible by choosing metal from their inner part. To make rollers for a homemade machine, you will need the help of a qualified turner, just make sure to prepare a drawing for it.

In any case, the largest roller of the belt grinder, which will be fixed on the electric motor shaft, will need to be made of steel, since a titanium blank of this diameter is very difficult to find, and duralumin may not withstand significant loads. For the entire homemade machine, you will need to make 4 rollers, the dimensions (diameter) of which are: drive roller - 150 mm, tension roller - 100 mm, two small ones - 70 mm. If you are going to make a mini-machine, then the diameters of the rollers may be smaller.

...as well as horizontally

When you assemble your homemade machine with ready-made rollers, it is very important that they are positioned strictly in one line. Otherwise, you will constantly experience the tape coming off. The width of the rollers depends on what size sanding belt you intend to use on your equipment. When you make a drawing for the manufacture of rollers, be sure to keep in mind that they must be barrel-shaped, this will ensure that the sanding belt is securely held on them during operation. In order to give the rollers this shape, a small bevel is made from each edge: 1–2 mm.

The finished rollers of your homemade belt grinder should have a smooth surface; you need to tell the turner who will make them about this. The bearings on which they will rotate must only be of the closed type, otherwise they will quickly become clogged with dust generated during the operation of the grinding machine. In order for your homemade equipment to work for a long time and without failures, you must choose bearings for it that have a class of at least 6. The rollers of the grinding machine rotate at high speed, so the bearings for them must be of very high quality.

Ready-made grinder in a horizontal position with an additional table

Characteristics that a belt for a sanding unit must meet

Selecting an abrasive strip is an important step when assembling a mini-grinder with your own hands. First of all, you need to decide on the length of the tape and its width. The geometric parameters of the strip are influenced by two main factors:

• grinder dimensions;
• purpose of the unit.

Fabric base withstands surface tension better

Endless abrasive strips are also classified into grit types. The length of the sanding strips can be different (from 610 to 1830 mm). Such tapes have a width of 50 or 100 mm. The first option is most often found in units assembled by hand at home.

A high-quality abrasive strip must have an elastic fabric base. When choosing the right tool, you also need to pay attention to how many revolutions the strip can withstand. It is recommended to purchase products that can operate at 1500 rpm. This option is best suited for making a belt grinder with your own hands. The drawing drawn up earlier must contain information about the dimensions of the abrasive strip and its other characteristics.

A good tape must have high abrasive resistance. The wear resistance of the tape depends on this indicator. For homemade machines, it is recommended to use belts whose length is no more than 123 cm. The abrasive strip must not only be resistant to wear, but also have good resistance to high temperatures generated during friction against the workpiece during operation.

It is worth noting that short length tapes are much more susceptible to wear than longer length products. Experts advise paying attention to pictures depicting finished products. Photos of the machines allow us to answer the question of how to make a grinder with your own hands. The design of the device can be significantly simplified if ready-made elements purchased separately are used in its assembly.

The speed and quality of product processing depends on the choice of tape.

And finally, special attention must be paid to the place where the abrasive tape is glued. The junction of the two ends of the strip should be as neat as possible, without any defects or protrusions.

How to glue the tape for the sanding unit yourself

Belt grinders contain a spring, which performs a very important function: it tensions the belt that has sagged due to wear. The belt is changed several times even when processing a small workpiece. This should be remembered.

When assembling a grinder with your own hands from plywood or metal, you can make an abrasive strip yourself. Gluing such tape is a complex undertaking that does not tolerate mistakes. There is a lot of advice on the Internet on how to properly glue tape, but many of them are incorrect.

The gluing process is as follows. First you need to select a fabric-based sanding material. Then you should prepare both ends of the abrasive strip. To do this, they are cleaned. The seam on the strip is made exclusively using the butt method. Experts definitely recommend reinforcing the glued tape from the inside with a thick strip of fabric, which is fixed with a special adhesive composition.

Gluing tape is a complex process that does not tolerate mistakes.

Note! Under no circumstances should you use Moment glue to glue the tape.

In order to connect the ends of the abrasive strip, you need to purchase a special adhesive composition. The best option is to use elastic glue. There is no point in saving money, since cheap products, as a rule, are not of good quality.

Before gluing, it is necessary to prepare a strip for sanding tape. A do-it-yourself grinder (from scrap materials) needs a reliable abrasive strip, which is difficult to do at home. The process is carried out using a glue stick, which is installed on hot-melt guns. First, the composition is heated. To do this, you can use a regular hairdryer, which is found in every home.

Consumables and parts

The only consumable material for a belt grinder is a tape (not counting grease for bearings and hinges. The tape can be ordered to the desired length (see at the end), but you can also make it yourself from textile-based emery cloth. It is highly desirable - flexible, unimpregnated. In general The procedure for making a grinder belt with your own hands is as follows:

• We cut the workpiece - a strip of the required length and width.
• We prepare a mandrel (not necessarily round) with a length along the generatrix slightly less than the length of the tape.
• We outline the mandrel with the workpiece inside out.
• We bring the ends of the workpiece exactly end to end and securely fasten them.
• Place a piece of glue stick for a hot glue gun on the joint.
• Heat with a construction hairdryer until the glue melts.
• We apply a patch of thin fabric to the joint.
• Press with something hard through the Teflon film until the glue hardens.

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There are three significant points here. The first is to use a rough PET film with a thickness of 25-50 microns (sold) instead of fabric for the patch. It is very durable, but just try running your finger across a PET bottle. Not very slippery? Rough PET film cannot be stretched under tension even over polished metal. And instead of a patch, it is better to seal the back of the tape with a continuous strip of PET film with an overlap of 2-3 cm. The runout of the tape will be no more than 0.05-0.1 mm. This is less than from the thinnest calico and even less than the error in the thickness of the blank skin.

Second, insert the finished tape into the machine and grind something indecent with it without strong pressure. The scar on the seam will be sealed, and the tape will become no worse than the branded one.

But the most important thing is that in terms of elasticity, the best adhesive for gluing grinder tape is not expensive and difficult to use, thermal or assembly, but ordinary PVA. If the tape is covered with a lining along the entire length of the back, then its PVA strength will be more than enough. How to glue PVA grinder tape, see video

Video: gluing grinder tape with PVA glue

The generatrix (side surface in cross-section) of the grinder drive pulley must be straight. If you use a barrel pulley, the belt will bend like a trough along its entire length. The rollers prevent it from slipping, see below, but the generatrix of the pulley must be straight.

A pulley for a grinder that is not intended for particularly precise work, firstly, does not have to be turned. In a scheme with 3 rocker arms, the beating of the belt from its misalignment will go out on the rollers before it reaches the working branch. In a simple vertical grinder, the beating of the belt will be sufficiently damped by the tension spring. Therefore, it is quite possible to make a pulley for a grinder without a machine, see video:

Video: drive wheel on a grinder without a lathe

Secondly, the pulley, rollers and, in general, all the parts of a home grinder can be made from plywood. In production, this is certainly not an option, even if a plywood grinder is offered for free with an additional payment: the grinder needs a salary, and the wooden grinder in the workshop will completely wear out before it pays for it and itself. But you won’t be running a grinder at home every day in 3 shifts. And no tape slips along the plywood pulley. Incl. homemade. So you can safely make a grinder pulley from plywood:

Video: pulley for grinder made of plywood

Table for calculating the speed of the grinder belt based on the diameter of the pulley and motor speed

Fortunately, for most abrasive-material pairs, the permissible belt speed limits are quite wide, so choosing a pulley for the grinder can be easier:

Video: what wheel is needed for a belt grinder

Rollers

The rollers of the grinder, oddly enough at first glance, are its most important parts. It is the rollers that keep the tape from slipping and ensure its uniform tension across the width. Moreover, there can be only one video in kinematics, see, for example, the video above about the grinder for incisors. Only barrel rollers can cope with this task, see below. But the “trough” of the belt after any roller must straighten before it reaches the working area.

Rollers with flanges (sides, edges) will not hold the tape. The issue here is not only and not so much with the misalignment of the roller axes: the grinder belt, unlike the drive belt, must withstand the loads from the parts being processed without slipping. If you make videos with flanges, then if you barely touch the tape with something, it will creep onto the flange. In the grinder you need to use Type 3 barrel rollers (highlighted in red on the left in the figure).

What should the grinder videos be like?

The dimensions of Type 3 rollers are also given there. It is advisable to take the diameter of the rollers no more than 0.5 of the width of the tape (so that the “trough” does not go far), but not less than 20 mm for turned steel and not less than 35-40 mm for plywood. The tension roller (the probability of the tape slipping from it is greatest), if the working branch of the tape does not come off it, can have a diameter of 0.7-1.2 its width. Plywood rollers are made in the form of a thick shell into which the bearing is pressed; then the roller is mounted on the axle (in the center in the figure) and processed cleanly, see e.g. track. video:

Video: barrel roller for grinder

Not every turner can turn a profile roller barrel exactly according to GOST even on a machine. Meanwhile, there is a way to make videos for the grinder without significant difficulties. The same PVC-reinforced garden hose will help out, on the right in Fig. previously. A section of it is pulled tightly onto a roller blank with a straight generatrix and cut off with a margin along the edges to the thickness of the hose wall. The result is a roller with a complex profile of the generatrix, which holds the tape even better and gives it a smaller “trough”. Don't believe me? Try to get to an airplane or missile graveyard and dig around in them. You will find rollers with exactly the same generatrix profile. It’s just that mass production of complex profile rollers is much more expensive than Type 3 barrels.

Homemade grinder: drawings with turntable dimensions and assembly tips

At home, you can design both a simple version of the machine and a more functional device. In order to expand the operational capabilities of the unit and ensure ease of operation, a rotary-type support table is manufactured. This surface is installed on the side of the largest pulley.

The drawing of the machine is prepared in accordance with its design features

The advantages of using a rotary table are obvious. First of all, this will allow you to fix the part in a certain position, which will simplify its processing. When assembling a rotary grinder with your own hands, it is worth considering the possibility of changing the direction of the abrasive strip. The emery must necessarily move in the direction where the working surface was turned.

The table must be equipped with a movable locking element - a bracket. This part must implement the function of rotation relative to a horizontal axis at fixed angles.

Most often, for simple machines created at home, a table made of duralumin is used. A wooden option is also available. The drawing of the machine is prepared in accordance with its design features. The thickness of the surface for the manufacture of which duralumin is used must be at least 15 mm. This is very important as a thinner table may not be able to withstand workloads.

The function of the pressure plane in this case is performed by the frame of the unit. To do this, it is necessary to prepare the frame. It is enough to simply grind one of the surfaces of the frame - the one located near the object stage.

For the manufacture of simple machines created at home, a table made of duralumin is used

Do-it-yourself grinder at home from a drill: assembly features

Such a grinding device can be made in a simpler way. Of course, assembling a stationary unit, which is designed to be installed on a table, is the best option, allowing you to grind various parts on an ongoing basis. There are other, less complicated options for creating a do-it-yourself grinding device.

If you wish, you can make your own grinder from a grinder or drill. The drill is an electric tool, so you must follow safety rules when working with such a device.

The need to process metal and wooden workpieces arises quite often in everyday life. Purchasing a factory-made unit for small volumes of work is not the best solution. The easiest way to make a simple grinder is to use a drill.

Most often, improvised materials such as wood, plastic, and plywood are used to assemble such a grinding attachment. Before starting work, it is recommended to prepare a nozzle diagram, which will allow you to make a grinder with your own hands. Videos on this topic are also recommended by experts for viewing, as they cover all the nuances associated with the assembly.

Stationary grinder made from a drill on a wooden base

It is worth saying that when working with small workpieces made of plastic and wood, this grinding machine performs almost no worse than stationary equipment.

Another advantage of this solution is that modern drill models have a special controller. Its function is to regulate the drive speed. Structural simplicity and high efficiency are reflected in the popularity of this solution.

Disc or tape? And drive

There are almost more types of grinding machines used in industry than lathes. The emery known to all craftsmen - a motor with a pair of grinding wheels (or one wheel) - is also a grinder. For yourself at home, it makes sense to make either a disk end grinder (plate grinder) or a belt grinder. In the first, the abrasive is applied to a rotating hard disk; in the second - on an elastic band running around a system of pulleys and rollers. The disc type is more suitable for grinding simple wooden parts and coarse or medium clean metal parts. Using a belt grinder, it is also possible to produce precise and clean finishing of profiled parts of complex shapes, incl. large-sized, see below.

A disk grinder is very easily obtained from the same emery or a motor of suitable power, see below. You need to order an adapter from the electric motor shaft to the shank of a metal-based grinding disc. Or under a clamping chuck, then on the same motor it will be possible to build a mini lathe, see figure:

Homemade disk grinder

A worn-out “plate” is suitable: a disk made of thin (4-6 mm) fibrous plastic is glued to the edge of its side, and an abrasive is placed on it. How to make an end grinder, see next. video clip.

Video: homemade end grinder

Note: a 100-200 W drive uses a mini belt grinder (see below) for precision knife dressing, grinding/polishing jewelry, etc.

A drill or screwdriver as a grinder drive is also convenient in that it allows you to quickly change the speed of movement of the abrasive (see below) using a standard speed controller. You just need, firstly, to make a holder for the drill that rigidly fixes the tool. Secondly, an elastic transition coupling from the drill to the disk shank, because It is difficult to achieve their precise alignment without special equipment, and runout will negate the accuracy of processing and can damage the drive tool.

Drawings of a drill holder for using it as a drive for a home metal-cutting machine are given on the left in the figure:

Drawings of a drill holder for driving a grinder (grinding machine)

Since shock and irregular alternating loads on the drive in a grinder are an order of magnitude lower than, say, in a lathe, the drill holder for it can be made of hard wood, plywood, chipboard, MDF, on the right in Fig. The diameter of the mounting (large) hole is along the neck of the drill. It is highly advisable to use a drill without an impact mechanism and with a steel shell on the neck (for installing the front handle).

coupling

For the adapter coupling, you will need a piece of steel rod (not necessarily turned) of the same diameter as the shank of the grinder drive shaft, and a piece of PVC-reinforced hose (garden irrigation) with a clearance such that it stretches tightly over the rod and shank. The length of the “free” hose (between the ends of the rod and the shank in it) is 3-5 cm. The length of the protruding part of the rod should be sufficient for reliable clamping in the drill chuck. After assembling the coupling in place, the hose on the shank and rod is tightened tightly with clamps; can be wired. Such a coupling completely counteracts the misalignment of the drive and driven shaft up to 1-1.5 mm.

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