Manual mills for grinding grain at home are modern household designs that allow you to effortlessly obtain flour from different types of cereals.
Professional engineers apply the latest technology to the design of the bean grinder to make working in the kitchen enjoyable and easy. These are relatively new units, but they have managed to gain wide popularity in the kitchen appliance market.
There are also industrial grain mills. But they are used in large flour mills and farms. Their prices are quite high.
There is a wide range of accessories available in stores, such as a bean grinder. But to make such a device yourself is not so difficult, but it will take a fair amount of skill and the ability to work with turning and drilling fixtures. home grain millwill allow you to get flour of different grinding, depending on the specified setting. In this case, you will spend a minimum of money.
This article will tell you how to make a grain mill with your own hands.
Mill "Baby"
The most common model is the Malyutka grain mill. It was invented in Udmurtia by two engineers. By means of this device, it is possible to achieve not only the grinding of grain to the required size, but also the manufacture of compound feed and the production of flour from corn, buckwheat and other cereals. This electric grain mill will become a must-have for a family that lives in their own home and has pets.
The size of this machine is small, but the level of performance can surprise any user. You can process a full bucket of corn in five minutes, and you can easily grind a bucket of wheat in just three minutes.
Technical parameters of fixture:
- body size, not including hopper and nozzle, is 320 x 160 x 170mm;
- device is capable of grinding two types: fine and coarse;
- low 180W motor power;
- high performance with low energy consumption;
- presence of a reversible rotary engine;
- device weighs 15kg.
The main task that increases the efficiency and strength of such a machine as a grain mill is the assembly of the rotor and stator.
Device Diagram
Many are wondering how to make a grain mill with your own hands?
Before you start assembling the fixture, experts advise stocking up on all the necessary parts:
- electric motor (you can use the engine from a washing machine, since the required power is small);
- motor mounts (requires 12 M6 bolts with washers equipped with springs);
- motor mount (two 45 x 45mm steel angles);
- device base (frame) made of sheet steel, the thickness of which is 6-8 mm;
- studs with nuts for tightening;
- receiving box based on roofing metal;
- rotor;
- bearing cap;
- stator;
- pipe;
- 3mm thick iron sheet cover;
- four M6 screws securing the cover;
- distance ring;
- receiving box fastening;
- two bearings 203;
- three screws connecting bearing caps;
- M6 screws equipped with nuts (for installation);
- load box;
- axle (M6 stud and two nuts);
- wood handle;
- pipe attachment points.
Rotor manufacturing process
The do-it-yourself manual grain mill has a unified scheme, so the assembly can be classified as light. If it is not possible to prepare parts by hand, you can order them fromturning workshop. You need a stator, a rotor, and a bearing cap.
If you decide to resort to the manufacture of the rotor on your own, then you should take into account a number of important technical nuances:
- The part must be equipped with a shaft with a variable section. It is made from a forging M 45 9 cm long and 12 cm in diameter or steel round timber.
- The whole process should proceed in stages: preparation of metal parts (holes with a radius of 5 cm are drilled at the same distance in a circle with a diameter of 105 mm).
- Remove the outer layer of the circle in such a way that the size of the groove is reduced to 104.5 mm. The working teeth must be open. After that, the rotor is hardened.
Rotor machining
The hardening of the rotor must be done in a certain sequence: the temperature in the furnace is brought to 800 ºС, after which the part is lowered into the oil container. Cooling the metal with water in this case is highly discouraged, as cracks may appear. Then tempering takes place: the rotor is subjected to secondary heating, but already up to a temperature of 400 ºС. Let it cool down at room temperature. As a result, you will get a very durable and solid part that will last for decades. To check the level of quality of the work performed, you should run a file along the cutting side of the tooth. If a slip is noted and no trace remains, then this means that everything was done correctly.
In thisdevice, like a homemade grain mill, the rotor will spin with the help of two radial bearings. This increases the stiffness of the knot and the strength of the fixture. A distance ring of 0.5 mm is made between the bearings in the shaft. It serves to displace the bearings and create the tension necessary to adapt the assembly to the stress in the mechanism.
Making a stator
Making a stator is a bit more difficult as it requires precision. The work is done in stages. First of all, the workpiece is turned on a lathe, and then a small technological allowance is left. For this purpose, an opening up to 70 mm is drilled in the center. A circle is marked on the workpiece with a diameter index of 105 mm, the central points of future openings are applied. Subsequently, they will become the working plane for the stator. The markup is applied strictly according to the drawing.
The contours of the holes are marked at the top and bottom, and then blind "windows" are drilled with a depth of approximately 26 mm. The allowance left earlier is removed on the machine and the space for the working chamber (105 mm) is bored. The resulting workpiece is turned over and a landing recess is made to insert the bearings. You will also need to make a groove for sealing parts. The mill can function without this component.
When the stator is ready, you can start creating threaded holes for the covers for the bearings, stator, tube and box for loading. The stator, like the rotor, is subjected to heat treatment according tosimilar technology.
Ensuring accurate operation of the unit, you should correctly set the coordinates of the stator. In this case, bolts are used. The rotor during operation should move slowly and easily, without jerks and stops. Only after checking the functionality of all parts, you can start a trial run of the device. For this purpose, the mill (milling machine) is fixed on a stool or table so that it does not fall during vibration.
Stand production
The bed is an important part. It is used as a base plate. To create it, a sheet of steel with a thickness index of 6-8 mm is used. The stator is attached to the frame by means of M6 screws. The screws will also hold the nozzle, which can be removable. The branch pipe is installed in the opening of the base corresponding to the diameter of the part. In the mechanism, it is held only by friction.
Manufacture of a branch pipe
To make a branch pipe, you should take a piece of pipe with a thin wall. Its diameter should be equal to 28 mm. Applicable product with the presence of a round or square section. Depending on this indicator, a hole of the desired shape and diameter is made in the frame.
Making a box for loading
If you have made all the above items, then the production of the loading box is not so difficult. It is made from roofing metal sheet, bent in accordance with the desired shape and soldered seams. Ordinary sheet metal is also applicable, but roofing sheet has more strength.
When the part is ready, it should be installed on the stator and fixedwith two M6 bolts.
Taking into account important points
Before you start assembling a manual mill for grinding grain, the following fact is taken into account: if the rotor is rotated only in one direction, then the first half of the stator working chamber will be in working order, and when the rotor rotates in the opposite direction, it will connect second. The sides differ in the number of protrusions and their sizes. This allows you to get flour of different grinding (large or fine). Only the direction of the rotor needs to be changed.
Installing the unit
To bring all parts into working condition, a certain amount of current is required. Before you start cutting out all the details of the fixture, prepare the necessary electrical equipment. This unified design does not require expensive components.
You will need an electric motor, a 3.8uF capacitor, a fuse, and a toggle switch. The engine is mounted on a dielectric plate, and the rest of the components are attached there. In order for the rotor to turn in the opposite direction, they resort to switching the capacitor.
Shafts for crushing and the engine are located along the axis. A rigid coupling is used to transmit rotation. Holes are drilled in the mounting corners, which guide the parts to adjust the position. Holes are made in the frame. They are needed to move.
Groats are loaded into the receiving box, a container for flour is placed under the outlet pipe and the first grinding process is carried out at homeconditions.
The article highlights the question of how to make a grain mill with your own hands. The manufacture of such a practical device is not particularly difficult. A manual machine will cost you much less than buying a factory fixture.
