Based on relevant physical properties of the corn ear, the corn prototype was designed to achieve corn shelling with lowest losses (un-shelling) and highest shelling efficiency in proper time. The reciprocating shelling plate is investigated as friction surface that easy shell the kernel from the corn ear. This way able to reduce the corn ear movement in varies the direction consequentially rising the percentage of shelling efficiency. The shelling prototype has two segments: one to remove the kernel from ear; and a second to collect the kernels. The oscillating shelling plate is a separator that is manual-driven and can reciprocate at four levels of reciprocating stroke were changed during caring out the experiment that were regulated by changing the crank radius (4.5; 6.5; 8.5 and 10.5cm). Three levels of shelling teeth number 100; 125 and 150 and three phases of the hand revolution of pedal, namely15; 25 and 35 rpm were investigated. The clearance between the corn ear and shelling plate were 2.5; 3.0 and 3.5mm.The shelling plate speed (m/s) was recorded relative to the angular speed of connecting shelling plate with the end point of crank radius. All experiments were carried out under constant kernel and cob ear moisture content "MC" of 10.8% and 10.32 "wb" respectively. The study gives the indicator to judge and deduce that the best factors which give the highest shelling efficiency (98.0%) were found at shelling plate frequency of 1.18 Hz, 10.2 shelling displacement of point ‘P" and crank “ω t" of 3.8 radial and the highest productivity (79. 23 kg/h) was recorded at displacement of crank radius of 10.5 cm, 25mm corn shelling clearance and 0.94Hz    frequency factor. Whereas, the lower value of productivity (26.8 kg/h) was found at frequency factor of shelling plate of 1.23 Hz with corresponding lower crank radius and the highest clearance values of 4.5 cm and 2.5 mm respectively.