Homemade Grinder. Important points.
There are many designs of homemade grinders. Someone makes them using the motor from an old washing machine, someone makes from an old angle grinder or drill, but unites all these models with the same technical details. Let’s break them down in more detail.
There are no specific dimensions identical for all grinders, they can be purely individual in each case. When choosing the dimensions and design of the belt-grinder, you need to be guided by the free space in your workshop and the rule, the longer the belt, the more resistant to abrasion it will be and, accordingly, less often it will have to be replaced. If you are going to buy ready-made already glued bands for the grinder, then the machine must be designed taking into account the size of these bands. If you are going to glue the tapes yourself, the size of the machine can be arbitrary, but it is best to stick to the standard sizes of the tapes.
Abrasive belts for grinder width are available in two sizes: 50 and 100m. The length of these belts can be 610, 915, 1230, 1600, 1800, 2000 millimeters.
It is best if you have the abrasive belt in the right length, then it will be easier to adjust the size of the grinder.
The main nodes of the grinder. is the frame of the machine with a working table and a clamp for the belt, an electric motor with a drive roller, tension roller, barrel roller and, if necessary, additional trailing rollers. Barrel roller can be a tension roller at the same time.
The most compact Grinder can be made with only two rollers, one driven on the motor shaft and the other tensioning barrel-shaped.
Belt Grinder with Washing Machine Motor.
The same machine with a washing machine motor. View from another angle.
The machine is made with a plywood frame.
Grinder with furniture gas shock absorber.
This machine is constructed using the rollers from a car’s timing belt.
Another belt grinder with plywood frame.
Grinder with angle grinder drive.
Compact machine with furniture gas spring.
Compact belt-grinding machine on two rollers.
Machine with plywood frame.
If the Grinder is going to work with long abrasive belts, you cannot do without additional driven rollers.
Why do you need a barrel-shaped roller?? When assembling the machine, it is almost impossible to maintain perfect parallelism between the axes of all the rollers. For this reason, the belt tends to run off the rollers. To eliminate this disadvantage, a barrel roller is used. By adjusting the inclination of its axis, it is possible to “force” the abrasive belt to stay in place.
The principle of an ordinary door hinge can be used to adjust the barrel roller axle. The axis of the roller is welded to the movable part of the hinge, and the adjustment is made with a bolt. Which rests on the moving part of the hinge.
Picture shows the barrel roller of a grinder.
Note the barrel roller and adjusting bolt.
Barrel roller with adjustment mechanism.
Barrel grinder roller.
The belt tensioning mechanism can be made in several ways. The most common is with a spring, the second is with a furniture gas shock absorber and the third is with ordinary rubber, such as from a bicycle camera. If a furniture gas shock absorber will be used, you should know that it does not work well at low temperatures.
It is recommended to make a double-layer stop for the belt. The base of the stop should be made of metal sheet and a smooth porcelain tile should be glued to it. This way, the stop will be practically not heated during intensive work on the grinder. Also porcelain tile wears much slower than metal. It will be easy to replace as it wears, you just need to heat the joint with a construction hair dryer, and it will come off. It can be glued with a common silicone sealant for marble, such as Silirub MA from Soudal.
The belt must be adjustable in relation to the belt. It should be moved tangentially to the strip or with a slight overhang to 0.5mm. This overhang does not cause excessive wear on the belt, but allows longitudinal grinding of long strips and prevents them from snagging on the convex parts of the rollers.
Making a belt grinder (Grinder)
Belt grinding machine (Grinder) with their own hands conceived for such tasks as finishing grinding, polishing parts from different materials. With his help, you can process, polish, grind surfaces of wood, and other various coatings. This device is mainly used in furniture production, as well as in blacksmith shops.
Such a machine will also be useful in the home workshop, but the factory-made models are usually quite expensive for the average amateur locksmith. A much more profitable and realistic solution is to make a grinding machine with your own hands. It is assembled from a 550 W electric motor, 2400 rpm, with a belt of 15 m/s, which is a very good result. The base of the machine uses a frame of channel channel 120 mm, also apply standard wheels width of 30 mm. For the manufacture of the spring-loaded rod holder, a profile tube with a square cross-section is taken. The sanding belt is tensioned by a spring.
List of materials used: electric motor 550 W, 2400 rpm; channel 120 mm; wheel, width 30 mm. 2 pcs.; bearing; sanding belt.
List of tools: welder; angle grinder; wrenches; screwdriver.
Step by step description of how to make a grinder (grinding machine)
Drawings, diagrams, prototypes, which are taken as a basis.
Boring a flange on an electric motor, using a lathe.
We do it with a disk or with a belt?
Grinder drawing. On the breadth of the product line with grinding machines can compete only lathes. Grinders on the market offer a huge number. all sorts and sizes.
The most famous and primitive in the form of the famous emery wheel. a pair of grinding stone circles with a screwed motor. These machines are sold in a wide variety of circuits and operating principles.
But if you plan to make a self-made grinding machine by yourself, it is better to stop and choose between two options: disc or belt.
- Disk Grinder the sanding layer of abrasive is applied to the disk, which rotates while it is switched on.
- Belt machine, in which the abrasive is applied to a belt wound on rollers.
Which one is better. it is wrong to speculate. The right criterion is “whichever is more appropriate”. The choice should depend on what you are going to sand. If it is relatively simple parts from, say, wood, you are more suitable self-made disc wood grinders.
If you have serious sanding work ahead of you on fine finishing with complex parts, choose a belt.
It is necessary to take into account the difference between the strip and the strip not only in terms of their functionality. Another important factor is the drive power. You sand small wooden workpieces, you will need 160-170 watts of power.
elementary engine from a washing machine or even from an old drill will easily produce this power.
Grinding large and bulky parts requires more power. up to 1200 watts. Note right away that buying capacitors for the machine will not cost you much cheaper than the motor itself.
Belt sander with their own hands
From this article you will learn how to make a simple sander with their own hands. Here is a detailed description of the work, photos and video.
You can see a lot of different homemade things at https://sdelairukami.ru, we recommend.
Greetings to all home crafters and craftsmen! Your attention. another homemade on the basis of the engine from the washing machine (we previously described what you can make homemade on the basis of the engine from the washing machine).
To construct this construction, we need to prepare the following materials in the form of: plywood; engine from a washing machine; plumbing coupling and a piece of pipe; a rod with a thread. bolts, washers, nuts; glue; a piece of particle board; bearings; switches.
The process of making a grinding machine
In the photo you can see how the process of making the grinder goes.
First we have to cut the wood particleboard blanks, which will make the body of our future device.
The next step is the washing machine motor. To install the driving pulley on the shaft of the engine, a coupling sleeve made of plastic pipes is selected, so that it sits tightly on the pulley of the shaft. To get the right size pulley shaft, you need to turn on the engine and work with a file like a lathe. Then the clutch is carefully pressed onto the pulley, it should be fixed clearly. And to fix it further, you can use glue.
In the socket we insert a piece of pipe that acts as a drive roller. To ensure better grip with the grinding belt, we wrap the roller with rubber from a bicycle wheel camera.
The next step is to assemble the body, install the engine, securely fix it with bolts and nuts. The table top will have two holes. for the driven roller and for the driven one.
To make the tail pulley we also take a piece of pipe and press a pair of bearings into it. Make the axle from a long bolt or threaded rod. The axis of the driven roller is mounted on a special platform of plywood, which can move under the table top in the horizontal plane. That’s how the sanding belt is going to tension.
To tension the belt as comfortably as possible, we use a long threaded rod with a nut. He will pull the platform. so the tension of the grinding belt will happen. Note that there is no belt centering function. Hold the rollers so that the axes do not move, but diverge a little, as seen from the upper point. That way the belt won’t come off.
Then mount the backing pad for the emery belt.
The grinding belt is put on rollers.
You can now machine the wood with the homemade belt sander. Great helper for the home workshop!
In the video you can consider in detail how to make a belt sander with their own hands.
How to make a belt-grinding machine
Many home masters and professionals wonder how to make a grinding machine with their own hands. The reason for this issue is quite simple: the high cost of commercially available grinding equipment, which recoups for occasional use is not all under force. In order to make such equipment, you need a few basic components: an electric motor, rollers and a reliable frame. Naturally, drawings of such a device or its photo will not be superfluous. Also at the end of the article you can see videos on assembling the belt grinding machine by your own forces.
The motor for the belt grinding equipment is not difficult to find, it can be removed from a used washing machine. Bed will have to make yourself, you can use a sheet of metal with dimensions of 500x180x20 mm. One side of the base should be cut very flat, because it will be necessary to attach a platform, on which the electric motor will be mounted. The motor platform should also be made of sheet metal with the dimensions of 180x160x10 mm. Such a platform should be fixed to the bed very securely with a few screws.
The efficiency of the belt grinding machine is directly dependent on the characteristics of the electric motor that is installed on it. If you are going to make a grinding machine with their own hands, then you are quite suitable electric motor with a capacity of 2.5-3 kW, developing the order of 1500 revolutions per minute. In order to use such a motor, the grinding belt travels at a speed of 20 m/s, the drums should have a diameter of about 200 mm. What is convenient, if you pick up the motor with such characteristics, then you do not need to make a reducer for your grinding machine.
The drive shaft is connected directly to the motor shaft, and the second. the slave. must rotate freely on the axis, which is installed in the bearing units. In order for the abrasive belt to touch the surface of the workpiece more smoothly, the section of the bed on which the drive shaft is mounted should be made with a slight bevel.
To make the shafts for the belt grinding machine with minimal financial costs can be made of wood chipboard. You just cut a square billets of 200×200 mm from such a board, drill central holes in them and put them on the axle with the package with a total thickness of 240 mm. After that you will only have to mill the resulting package and make it into a round shaft with a diameter of about 200 mm.
Drawings and a detailed breakdown of some parts of the machine made of wood.
Tape grinder out of wood (click to enlarge)
Table tilt adjustment mechanism Plate unit Belt tensioner Machine tool assembly
For the belt to be located strictly in the middle of the shaft, the diameter of its central part should be 2-3 mm larger than the edges. And in order to prevent slippage of the belt on the drum, it is necessary to wind a layer of thin rubber on it, for which you can use an old tire from a bicycle wheel, having previously cut it along its entire length.
Grinding belt for such a machine, the optimal width of which should correspond to 200 mm, is made from ordinary sandpaper. The standard cloth is cut into strips of the required width, and the abrasive tape is pasted from them. Keep in mind that the material is glued to the joint, for this purpose on the back side is placed a dense cloth, which will strengthen the resulting joint. The properties of such a seam is greatly influenced by the glue, it must be very high quality, then the material will not tear at the seam after a short time of use.
A few more options for making belt-grinding machines can be seen in the video below.
On homemade belt sander you can not only process wood products, but also use it to sharpen various tools: chisels, secateurs, knives, axes, etc. In addition, such machines can handle parts that have a curved surface.
This machine uses the electric motor from a washing machine. We connect it to the 220 V mains, through the speed regulator.
Diagram of connection of the controller to the electric motor.
We make the body of the machine from particle board and fasten it with furniture screws. On the body, you need to bolt the motor. We make the stop for the emery belt from the assembly corner, which edges are rounded to prevent the belt lock from catching.
We make the driving roller from two polypropylene pipes of 20 and 32 mm in diameter.
Choose the big pipe with the inner diameter also equal to 20 mm.
In addition, in the inner hole of the double pipe we insert a tin pipe.
Put the drive roller on the slotted motor shaft.
For the driven roller we choose two bearings and depending on outer diameter. a polypropylene pipe with exactly the same inner size.
The bearings are flattened with a steel tube to relieve the side load. On the inner end of the roller put a ring cut from a sleeve of the same size, which will serve as a stop.
We assemble the resulting assembly on a stud and bolt it to the base using washers and nuts.
Homemade grinding machine is almost ready, now we put on the sanding belt. As it rotates, it can move along the rollers to the left or to the right. To eliminate misalignment, twist the driven roller around its axis by both nuts until the belt no longer shifts to one or the other edge. In this way, we will find the position when the band is in its proper place. Belt grinding machine, ready to work!
What is a belt grinding machine
A belt grinding machine, also known as a belt grinder or Grinder, is used for the following types of work:
- making, periodic sharpening of knives;
- The final sanding of the wooden surface before varnishing or painting;
- Rounding of the sharp corners of the workpieces of wood;
- Sharpening of bars with a sharp end.
The belt sander is suitable for working not only with wood but also with plywood and some kinds of metals: copper, brass, aluminum, steel. Essentially, the Grinder performs all the same tasks as a sharpener.
The design of the belt grinding machine is as follows:
- There are three pulleys at the base. When the motor is switched on, the main pulley starts to rotate and drives the belt with the abrasive belt.
- A second pulley of similar thickness but smaller radius is attached to the bearing.
- A third pulley is mounted and rotates on the top lever. The function of this wheel is to keep the abrasive belt in tight tension. On the back side of the belt grinder, the upper arm is attached to the frame with a spring.
A roller is placed on the motor shaft. There is a metal frame attached to the drive unit on which three more casters are mounted. They are all bound together by a flexible strip of the required granularity. The belt is stretched in the process. For its tensioning on one of the rollers there is an adjustment.
Workpiece is installed on the table, which is also part of the design. In some cases it can be rotated by 90 degrees. This makes it easy to grind parts in 2 planes in 1 setting.
Acrylic glass is installed as a safety device. Designed to protect the operator from flying dust. Attachment to the workbench by means of an integrated stand.