Rancang Bangun Sistem Penggerak Pada Mesin Perajang Kentang

Abstract

The drive system in a potato slicer serves to transmit power and rotational motion from the motor to the blade mechanism. The drive system must be designed to ensure that the components can withstand the workload and meet the slicing capacity requirements for a home-based industrial operation. The research was conducted through mechanical calculations and analysis covering rotational speed, angular velocity, moment of inertia, angular acceleration, torque, power, design torque, bending moment, shaft diameter and stress, bolted joints, bearings, and slicing capacity. Capacity calculations were performed to determine the minimum number of blades and to compare the theoretical capacity with the target capacity and actual test results. The calculation results showed a rotational speed of 600 rpm, an angular velocity of 62.8 rad/s, a moment of inertia of 58.32 kg·cm², and an angular acceleration of 31.4 rad/s². The required torque was 0.183 Nm with a power of 11.50 watts, while the design torque used was 43.73 kg.mm. The 17 mm diameter shaft produced an actual shear stress of 0.45 kg/mm², which is less than the allowable shear stress of 4.58 kg/mm². The bolted joint produced a shear stress of 0.66 kg/mm² and a surface pressure of 0.27 kg/mm². The calculated theoretical cutting capacity is 133.8 kg/hour, while the target capacity for a home-based industry is 30 kg/hour. The calculation for the minimum number of blades yielded 1.8 blades, which was rounded up to 2 blades. Continuous testing without interruption showed an actual capacity of 135.6 kg/hour. The designed drive system meets safety criteria based on calculations for the shaft, bolted joints, and bearings. The use of 2 blades meets the minimum requirement from the calculations and is capable of producing an actual capacity of 135.6 kg/hour, thus exceeding the target capacity for a home-based industry of 30 kg/hour. Therefore, the designed drive system configuration with 2 blades can be used to support the potato slicing process in accordance with the machine’s requirements.