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A motorized cowpea threshing machine was developed and evaluated to meet the need of small – scale farmers in the developing countries especially Nigeria. A power rating of 0.75 kW, fan speed of 826 rpm, beater speed of 418 rpm were used for the design. The driver and driven pulleys of 59 mm and 198 mm were used respectively. Two varieties of cowpea were used to evaluate the performance of the machine. The evaluation results showed that average threshing efficiency, cleaning efficiency, percentage of grain damage and throughput capacity were determined to be 83.6, 71.1, 4.4%, and 74.5 kg/hr respectively for Ife brown variety and 84.9, 68.5, 4.7%, and 73.0 kg/hr respectively for IAR 48 variety. The investigation was conducted at three levels of moisture content of 13.5, 14.5 and 15.5% wet basis. Based on the performance of the machine, effective threshing of different varieties of cowpea with minimum grain loss, improved threshing capacity cleaning and efficiency were achieved and yet good quality products was achieved.

Development and performance of a motorized cowpea threshing machine for small scale farmers in Nigeria