Designing small-medium scale groundnut (Arachis hypogea L.) shelling machine for local merchant in Tuban, East Java

In order to produce shelled groudnut, local merchants in Tuban are commonly use the manual methods by hand to shelled the groundnut which ineffective and inefficient. Therefore, the aim of this research is to design a groundnut shelling machine to accelerate the kernel production. There were three main stages that were conducted to achieve the result: designing, manufacturing and performance examination. Solidworks 2016 was used to design the 3D model of the machine before the manufacturing process in a workshop. The functional part of the machine consists of serrated roller and stator. While stator holds the groundnut, the roller rotates to break the pod by mechanical contact. Performance of the machine was then examined by varying the rotation speed of motor: SR 1, SR 2 and SR 3. One-way ANOVA perceived that SR 1 gave the significant fastest average operation (115.46 kg/h) (p < 0.0001) followed by SR 3 (96.78 kg/h) and SR 3 (99.89 kg/h). Speed Rotation 1 also gave the lowest damaged kernel about 30.96% among all dim (p < 0.05). Moreover, the machine gave more than 99% shelling efficiency and less than 0.5% losses. Further research must be conducted regarding varying lower rotation speed, moisture content, and different variety of groundnut.