DIY Velcro grinding wheel

How to make rollers for a machine

The rollers on which the abrasive belt is placed can be selected from ready-made samples. This approach can be implemented if such a possibility exists. In most cases, they make do-it-yourself grinder rollers. Their sizes range from 70 mm to 150 mm. It is determined by the width of the tape used. In this case, the following approach is used:

  • Select a belt tensioning mechanism.
  • Dimensions of each roller.
  • Select material.
  • Mounting methods.

velcro, grinding, wheel

The most accessible materials for the manufacture of rollers for a grinder are considered wood or plywood, pvc blanks, finished bearings. For the manufacture of rollers from pvc pipes, a billet is selected, in which the inner and outer diameters correspond to those specified in the drawing. The main disadvantage of such a roller is that the temperature rises at high rotation speeds. Therefore, the polypropylene roller can lose its original shape.

The manufacture of such rollers from bearings is reduced to their selection according to the inner and outer diameters. Professionals advise to choose bearings of at least the sixth grade.

In some cases, wood is used. For example, you can make your own videos from plywood. The whole structure will be light enough.

The main condition is the requirement. the loop of rotation of the abrasive belt must be reliable and durable. The tension roller for the grinder must have an adjustment mechanism that will provide the required degree of tension.

Brilliant Ideas Series | DIY Sandpaper Disc

All rollers must be installed vertically. Even a slight change in relative position will cause the tape to break quickly.

Energomash

Energomash offers grinders of its own production. With a strong manufacturing base, they manufacture a line of grinders designed to meet a variety of surface finishing tasks. Basically, these are professional equipment designed for various tape lengths.

The Zubr grinder belongs to the category of universal portable machines. With two grinding tools (wheel and belt), it allows you to solve almost any cleaning and grinding task. Thanks to the angular stop and fixing the angle of inclination of the working table, it is possible to change the working plane and ensure high accuracy. A special system for removing the formed dust and processing products improves working conditions, reduces dust and fire hazard.

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The provided system of protection against unintentional switching on of the electrical circuit ensures compliance with safety rules.

Rotary table device

Expanding the functionality of a homemade grinder can be done by making a turntable. It will allow you to process more complex products and increase productivity.

To implement this idea, it is necessary to develop and make a turning mechanism with your own hands. When developing, it must be remembered that on one side the bed must be rotary, on the other hand it must ensure reliable fastening of the necessary mechanisms.

Tensioner roller

  • We take as a basis a metal square with sides of 12 mm. It fits best with this profile tube.
  • Cutting off unnecessary details.
  • We put a piece of the profile pipe on the edge of the square and scald it. The bearing will be fixed in it, which will perform the function of a roller.
  • We drill a hole with a diameter of 8 mm for the bearing shaft and shorten the part.
  • Now you need to cut off 2 walls of the profile pipe to fit the bearing.
  • After the cut, we process everything with a file.
  • An 8 mm drill can be used as a shaft. We insert the shaft into the roller and grab.
  • After making all the parts of the grinder, you can proceed to the assembly. Insert a roller with a tensioner and put on an abrasive belt.
  • This design still lacks a flat stop. We expose an emphasis under the tape and you can grab.
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Of angle grinder

The simplest and most common design is an angle grinder. As a basis, a motor and an electrical control circuit located on a grinder are used. A special nozzle is made to set the abrasive belt in motion. It consists of two shafts and a fastening system. Grinder for angle grinder is an optional accessory. To assemble a grinder from an angle grinder with your own hands, you must independently make individual structural elements.

Finished designs can be found from 125 angle grinder. They mount onto an angle grinder, creating a belt mechanism to use a standard abrasive belt. The horizontal mechanism ensures the required characteristics of the grinder.

From a drill

A drill grinder can be made using a set of simple tools. In this case, it presents a special chuck attachment. Made by hand, they are designed to perform simple cleaning and sanding operations. Craftsmen have accumulated vast experience in creating such structures. Having the simplest skills in plumbing work, you can independently develop a unit diagram and make it yourself.

The use of a drill allows you to create stationary structures on the bed and portable. In this case, the drill is not attached to the machine, but transferred to the work surface.

Overview of factory models and prices

The variety of manufactured factory models creates great difficulties in choosing the required unit. The selection is made based on the following criteria:

  • the number of functions performed;
  • technical characteristics of individual components and assemblies;
  • at the price indicated by the manufacturer.

The most appropriate approach is considered to be based on the criterion “efficiency. cost”. Thanks to the competent definition of this criterion, you can choose an effective grinder at an affordable price.

Advantages over a sharpener

The belt grinder has a number of advantages over other sharpening and grinding tools. Compared to a sharpener, it has the following advantages:

  • extended possibilities for surface treatment, including for parts of large sizes and mass;
  • improved capabilities for positioning the tool relative to the machined surface;
  • uniform grinding of the abrasive coating of the belt (in contrast to the wheels at the sharpener)
  • simplified abrasive replacement system.

The wider possibilities for surface treatment, which are inherent in belt grinding machines, are expressed not only in the processing of large-sized parts. Even the simplest model can handle second- and third-order surfaces such as pipes, fenders and car bodies.

Correct selection of belts allows you to carry out all stages of processing: rough sharpening, grinding, polishing.

The abrasive wheel, which the grinding machine is equipped with, wears out unevenly during operation. This leads to a violation of its geometry, therefore, the accuracy and quality of processing.

However, the grinder has two design drawbacks. The first is lower reliability. This is due to the presence of a more complex mechanism for setting the belt in motion: bearings, shafts, tension springs, the belt itself. The machine has only a motor and an abrasive wheel.

The design complexity requires periodic inspection and maintenance. Bearing wear leads to imbalance and, as a result, to uneven adhesion of the belt. Prolonged use of the grinder changes the geometry of the shafts. They turn from cylindrical shafts to oval.

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DIY Velcro sanding disc

If you are often involved in construction and finishing work, then you probably have to clean up some surfaces very often. It is no secret that this is done with ordinary sandpaper, which becomes unusable in a very short time. If we compare the price of one sheet of sandpaper and a circle with Velcro, then the price will be completely the same, only the circle has a diameter of 12 centimeters, and the leaf is three times larger than this circle.

Watch the video how you can make three Velcro discs from a sheet of sandpaper

For work we need:
– 1 purchased round disc;
– standard size sandpaper sheet;
– double sided tape;
– scissors.

We need a base to which we will attach sandpaper and tape.

Then we take double-sided tape and cut off a large piece, which we glue in the very center of our circle. The tape must be very, very sticky, otherwise it will not hold

Now we cut off about 8 small pieces from the tape and glue them around the perimeter.

Now remove the protective film from the tape.

We take our sheet of sandpaper and turn it over with the rough side to the table surface.

In the very corner of the sandpaper, glue our blank. It is imperative to glue it to the very corner, otherwise we will waste a lot of sandpaper in vain.
Now we cut out the whole thing.

The disc is almost ready, the very last ones are left. this is to punch holes in the disc. To make holes we take a drill and any drill bit for wood.

Now we put any piece of wood on the table, put a reverse stroke on the drill and start making holes.

All our grinding disc is ready, now you can hook it to the machine and use it.

Of the minuses, although he is one, but he is. Discs need to be made with your own hands and spend your time and energy on it.

Belt sander device

The device is simple. The electric motor drives the belt, which rotates the 10 x 5 cm “main” pulley, which drives the abrasive belt. Another 8 x 5 cm pulley is located 40 cm above the main one and 15 cm behind it and is mounted on a bearing. A third 8 x 5 cm pulley rotates on a lever and acts as a tension roller, holding the abrasive belt tightly. On the other side, the lever is spring attached to the frame.

General purpose and types of machines

The machine is intended for the final processing of parts and workpieces made of different materials by exposing them to a surface with abrasive or diamond spraying. The machine, its constituent mechanisms and devices allow you to maintain the accuracy of size and shape, and also ensure the creation of an ideal surface of a part or workpiece.

With the help of the machine, you can machine flat parts, surfaces outside and inside, parts of various geometric shapes, grind or polish the threads and teeth of gear wheels. According to their characteristics, grinding machines are divided into:

  • Cylindrical grinding.
  • Internal grinding.
  • Centerless grinding.
  • Surface grinding.
  • Special machines (for grinding threads, gears).

Dimensions

Here is a table with the overall dimensions of our homemade tool:

Parameter Value, mm
Length 365
Height 400
Width 230

Dimensions of the walls and adjacent elements:

Bracket element dimensions:

Dimensions of handles and driven rollers: Tabletop dimensions: Base dimensions:

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Installing the rollers

First, you need to install the drive roller in the cover where the bearing is located. As shown in the photo.

Then the bolt must be tightened with a nut so that the bearing remains movable. After that, everything can be locked with a second nut.

The first driven roller is fixed in the furniture case. The structure is fastened with a nut between the roller and the wall of the grinding machine.

And in the same way the second roller is fixed to the bracket.

The last shelf is attached to the top and our machine takes on a similar shape. It’s time for the final stage.

Determining the type of drive

The main issue was to rotate the main pulley directly by an electric motor or with the help of an additional pulley and a drive belt. First of all, I chose the belt drive because I wanted to be able to replace the engine with a more powerful one, however, there was another reason. When you do intensive metalworking, there is a risk of encountering some problems. The belt drive in such cases will slip, while the direct drive will create big problems. With a strap, the device will be more secure.

Frame fabrication and installation

It is important to mention that using a metal corner as a frame can have both advantages and disadvantages. The obvious advantage is that it is easy to assemble, like a constructor in childhood. But the main drawback is that it is strong only in two directions, but weak when twisted. So, you need to take this weakness into account and calculate how much torque can be transmitted from the pulleys to the frame, and compensate for it with additional jumpers.

Cutting:
You can use a hacksaw to cut the angle, but an angle grinder with a cut-off wheel will do the job faster. After cutting off all the elements, I would recommend sanding all of their sharp edges so as not to cut during assembly. Holes can be drilled with a conventional drill and cutting fluid.

Necessity at work and at home

Today, grinding machines are constantly used in production halls. Depending on the scale of production, one machine can be installed, or all of its varieties in terms of complexity and dimensions.

However, this equipment is always used in everyday life. Some have a bench sanding machine in the garage for metal processing. Others have several different wood grinding machines installed in their workshop. Still others have a universal, combined machine in their possession. There are power tools for hand grinding: drum type, belt grinder, band saw, small machines or large machines. And they are all in demand.

There is a fairly wide range of all kinds of similar equipment from many manufacturers on the market. And the for them are quite reasonable. But these are general purpose machines. And if a person is engaged in his own business, or he has a hobby, then a machine of special specialization is needed. Here the price already rises several times.

For this reason, or based on their own desires, many craftsmen make homemade products. Mainly for processing wood, plastic and metal, less often for cutting and grinding stone. And, in general, this is correct. After all, even a simple sharpening of kitchen knives is easier and faster to do on a machine than manually using a whetstone. Fortunately, it has a very simple design to create a homemade wood machine with your own hands.