Rancang Bangun Sistem Transmisi Mesin Perajang Kentang

Ardi Tias Angriawan; Pongky Lubas Wahyudi; Dian Setiya Widodo

doi:10.35891/xfd4r856

Authors

Ardi Tias Angriawan Universitas 17 Agustus 1945 Surabaya
Pongky Lubas Wahyudi Universitas 17 Agustus 1945 Surabaya
Dian Setiya Widodo Universitas 17 Agustus 1945 Surabaya

DOI:

https://doi.org/10.35891/xfd4r856

Keywords:

Bearings, Pulley, Shaft, Transmission System, V-belt

Abstract

The transmission system for the potato slicing machine was designed to generate sufficient torque to rotate the cutting blades optimally and efficiently. The electric motor employed operates at 2,800 rpm with an initial torque of 0.68 N·m. Utilizing a transmission system with a 1:3 pulley ratio, the torque at the upper shaft increases to 1.831 N·m. Based on this torque and a disk radius of 3.81 cm, a cutting force of 48.06 N is achieved. The system utilizes a 3-inch diameter motor pulley and a 9-inch diameter upper shaft pulley, resulting in an actual rotational speed of 924 rpm; while this exceeds the initial target of 600 rpm, it remains within safe and efficient limits based on optimal cutting speeds for tubers. The shaft is designed to transmit a torque of 1,831 N·mm with an actual diameter of 25 mm, whereas calculations indicate a minimum required diameter of only 4.34 mm. The actual shear stress of 0.597 MPa is well below the safe limit of 170.67 MPa, confirming the shaft's safety against torsional failure. The shaft design accommodates two U005 bearings, each supporting a radial load of 24.03 N, with a theoretical service life of approximately 3,536.68 operating hours. The connection between the shaft and the pulley utilizes a 4 × 4 × 5 mm key made of ST 37 material, which was analyzed for shear and compressive stresses. Calculated minimum key lengths of 0.13 mm (for shear) and 1.74 mm (for crushing) demonstrate that the actual key dimensions provide a substantial structural safety margin. Overall, the transmission system design is deemed feasible and safe for implementation in the potato slicing machine.

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