This research aims to determine the appropriate machine rotation parameters concerning corn parameters (corn diameter and length) in optimizing shelling efficiency, shelling capacity, and shelling quality in a two-hopper corn shelling machine. The research method began with the design and fabrication of the machine, machine testing, measurement of corn characteristics (corn diameter and length), determination of machine rotations (1200, 2000, 2800, and 3600 rpm), data collection for shelling efficiency, shelling capacity, and shelling quality measurements, and data analysis of the test results. The initial data for the two-hopper corn shelling machine testing were as follows: a) Diameter of the front shelling chamber is 85 mm, b) Diameter of the rear shelling chamber is 55 mm, c) Length of the shelling chamber is 300 mm, and d) The distance of the shelling knives from the front of the shelling chamber is 210 mm. It is possible to draw the following conclusion from studies on the two-hoper system corn shelling machine: 1). The corn’s diameter significantly impacts the effectiveness of shelling. While the shelling efficiency is higher at a corn diameter of 31 to 38 mm at a rotating speed of 2000 rpm, 2800 rpm, and 3600 rpm, it is lower at a corn diameter of 33 to 37 mm at a speed of 1200 rpm. 2). The efficiency and capacity of shelling are significantly impacted by engine speed. The capacity and efficiency of shelling increase with engine speed. 3). 2800 rpm is the proper rotation speed for maximum corn shelling capacity, shelling efficiency, and broken grains.

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