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TOOLS AND MECHANISMS FOR AGRICULTURE
Micromill. Drawing, description
Directory / Tools and mechanisms for agriculture
It is within the power of any amateur craftsman who has experience working on lathes and drilling machines to make it. The working bodies of the mechanism are a rotor and a stator with ribbed surfaces. The first, driven by an electric motor with a power of 180 W, rotates inside the second, performing the function of millstones. In general, the whole structure looks like this: on the base - a steel plate 6-8 mm thick - a stator (a fixed working part) and an electric motor from a washing machine are mounted. Both units are mounted on corners 25x25x4 mm. Moreover, the first is regulated in the transverse direction relative to the axis of rotation of the rotor, and the second - in the longitudinal direction. These possibilities are incorporated in the attachment points of both elements. The shank of the motor shaft is connected to the rotor shaft by a feather-key coupling. The shaft, which has a flange for mounting the rotor, is seated in the stator on bearing No. 203. From the side of the engine, the bearing is covered by a cover made of a steel plate 3,5 mm thick. A movable working body - a rotor is attached to the shaft flange Ø 65 mm with three M6 bolts. I made them in two versions: heavy and light, which allows you to adjust the quality of grinding: by installing a heavier rotor, we will get a finer ground mass and vice versa. A rotor having a ribbed surface is manufactured as follows. A pitch circle Ø 104,5 mm is applied on the flat end of the steel cylindrical billet. The centers of the holes are marked on it at an equal distance. Then holes Ø 10 mm are drilled along the marked centers. Further processing of the workpiece is carried out on a lathe: the outer side is ground to a pitch circle and the central part is bored to a depth of 10 mm. After that, the workpiece is unfolded and, having fixed it in the chuck of a lathe, the second side is bored. It remains only to drill a central hole for the shaft Ø 15 mm and three mounting holes - Ø 6,5 mm. The heavy rotor is ready. To make a lung - all operations are repeated, and additional holes are drilled on the drilling machine in the working surface of the rotor - to facilitate the part.
The most difficult part of the micromill is the stator. As with the rotor, turning and drilling work will be required here. A dividing circle is applied to a steel cylindrical billet with a diameter of 154 mm and a thickness of 43 mm, indicating the dimensions of the working chamber and passing through the centers of future holes that form a ribbed surface. Then mark the contours of the upper and lower windows. Further, exactly according to the drawing, the holes are marked and drilled to a depth of 28 mm. Now, the central hole of the working chamber is bored on a lathe and, having unfolded the workpiece, they prepare a seat for bearing No. 203. Having drilled holes for installing an intermediate plate, a pipe, a bearing cover and the corners of the rotor, it is fixed on the base plate. From the outside, the working chamber of the rotor is closed with a cover cut from sheet steel 1,5 mm thick. The loading hopper, attached through an intermediate plate to the upper window of the stator, is made in the form of a funnel from 1 mm thick steel sheets. In my design, this part is assembled from four sheets tightened with bolts, but other options are possible. The lower window of the stator is equipped with a branch pipe, on which, if necessary, a sleeve can be put on. He will direct the finished product to a substituted bag or other container. Electrical equipment, consisting of a capacitor, a thermal relay and a toggle switch, is located on a dielectric plate mounted on small corners next to the electric motor. Before starting work, it is necessary to adjust the position of the stator with the help of bolts so that the rotor rotates easily, without jamming. The micromill is installed on a chair or stool, the engine is turned on, and the hopper is filled with grain. The crushed products will spill out of the outlet pipe into the substituted container. Operating experience has shown the following results: a bucket of corn is crushed in about 6-7 minutes, and grains of wheat, millet, buckwheat - 1,5-2 times faster. The entire portable micromill has been in operation for more than three years. There are no failures or breakdowns. I think many villagers will want to make one. Author: A. Baklansky
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I offer a simple and compact micromill. Its dimensions can be judged from the photo: the whole structure fit on one arm. It is universal: it is intended for obtaining corn flour of both coarse and fine grinding, grinding various grain waste and preparing feed for livestock and poultry in personal subsidiary plots.
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