A mango grader suitable for processing mangoes for export that worked on the principle of rolling the mango around the axis of minimum mass inertia was evaluated. Mangoes were made to roll down a slope in an expanding opening. Three grades were separated based on the opening size and a fourth grade consisted of mangoes that over flowed the largest opening. The opening for grade I, grade II and grade III were 50 to 57, 57 to 64, and 64 to 70 mm respectively. The grader was tested for different raw mango varieties namely; Totapuri, Alphonso, Chinnarasam and Neelum at slopes 8 degrees, 12 degrees and 16 degrees. The rates for which the grader were tested were 720 kg/h, 1800 kg/h and 2400 kg/h. The best results were with the Neelum and the lowest with Chinnarasam. Further, the best results were shown by the widest opening (64 to 70 mm). Twelve degrees was the best slope. The percentage of fruits correctly graded decreased as the feeding rate decreased.
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