This implies that the machine is practicable with performance likely to decrease with time of machine operation. The reason for this may be due to a decrease in the viscous effect of the internal wall which causes the air stream flow to slow down with a resultant drop in the relative angular velocity to the surface. The simulation results show that the angular velocity was high as soon as the machine commences operation, but this progressively decreases with an increase in the time of operation. The design results show that a 3 HP, single phase electric motor was required to power 25 mm shaft diameter of the machine. Computational fluid dynamic method was used to carry out machine simulation and the effect of time of machine operation on motor torque angular velocity and linear displacement were investigated. The design was based on previous investigation of the physical and mechanical properties of the seed at 15 % moisture content (db), including average breaking force of the seed (1.12 kN). Thus, this study was undertaken to design and simulate African oil bean seed dehulling machine.
While it is common to dehull the African oil bean seed manually, the mechanical operation of the process has not been reported.
In all, the machine cost N52,170 ($350) to produce.ĭehulling is a unit operation preceding oil extraction of most agricultural products. The metallographic specimen polishing machine can be used in the material laboratory for the grinding and polishing of any metallic materials.
The machine has the ability to grind and polish any kind of metals, is simple to operate, and requires minimum maintenance. The testing and evaluation of the machine involves test running of the machine at each speed rate without placing any metallic specimen on and also running after that metallic specimen was introduced for grinding and polishing. All of these components are assembled to form the polishing machine. The machine consists of motor, pulleys, belt, rotating shaft, wooden disk plate, bush bearing, pillow bearings, metal clip, and metal casing. The objectives of the project are to design and construct a machine that will polish metal for physical metallographic determination and also to design and construct a machine using locally available materials to produce a flat, smooth and mirror-like surface of any metallic materials in order to determine their physical structure using microscopy. One of the most useful pieces of equipment for the grinding and polishing metallic materials in order to determine their physical structure using microscopy is metallographic specimen polishing machine.
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