ETUK

This project focuses on the design and fabrication of an improved twin blades yam pounding machine to enhance the efficiency, speed, and quality of pounded yam production. Pounded yam, produced mainly from Dioscorea rotundata, is a staple food widely consumed in Nigeria and other West African countries. Traditional pounding using mortar and pestle is labor-intensive, time-consuming, and often unhygienic, while many existing mechanized pounders use single blades that limit effective tumbling and crushing of larger yam quantities. Experimental analysis was conducted to determine the crushing force of cooked yam, and detailed engineering design calculations were performed for motor selection, shaft design, pulley system, and bearing selection. A decision matrix was used to compare two design concepts, leading to the selection of the twin blade configuration due to its superior pounding efficiency. Performance evaluation of the fabricated machine showed that it pounded 1 kg of yam in 2 minutes, 1.5 kg in 2.27 minutes, and 2 kg in 3 minutes, compared to 6–8 minutes for single-blade machines and 15–20 minutes for manual pounding. The machine achieved a throughput capacity of 292.8 kg/hr and an efficiency of 97.6%. The results demonstrate that the improved twin blades yam pounding machine provides faster operation, better texture uniformity, and higher productivity, offering a more hygienic and efficient alternative to traditional and existing mechanical methods.