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Simanjuntak, Edward
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Humanities Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Medicine & Pharmacology Nursing

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Analisis Kegagalan Produk Baut Pengikat Pada Unit Fuel Pump Kendaraan Roda Dua Sutiana; Simanjuntak, Edward
BULLET : Jurnal Multidisiplin Ilmu Vol. 4 No. 3 (2025): BULLET : Jurnal Multidisiplin Ilmu
Publisher : CV. Multi Kreasi Media

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Abstract

Gasoline engine vehicles are vehicles that use 2 fuels, namely air and gasoline. In this test, it was observed that the fuel pump fastening bolt was damaged. This damage needs to be analyzed and examined to determine the cause of the damage to the fastening bolt component. The methods used to research bolt components include visual inspection, fractography, hardness testing, and Finite element method analysis using Solidworks software. From the results of the fractography test, it was determined that the damage to the bolt was caused by a torsional moment, leading to a fatigue fracture. The material used in the bolt component is ASTM A36. To validate the bolt material and determine the hardness value of the ASTM A36 material, a hardness test using the Vickers method was required, and the hardness results obtained for the ASTM A36 material were around 259.6 HV. The next test was to analyze the bolt to determine the torsional moment that occurred using the FEM method from the SolidWorks software. After the FEM test was carried out by providing a torque of 20 kgf on the bolt component, the bolt component broke due to holding an excessive load. Thus, the cause of damage to bolt components is due to excessive moment loads and material quality degradation.
Analisis Keandalan Mesin Milling CNC Menggunakan Metode Failure Mode and Effect Analysis Hardiyanti, Nina; Munir Fahmi, Mokhammad; Simanjuntak, Edward
BULLET : Jurnal Multidisiplin Ilmu Vol. 4 No. 2 (2025): BULLET : Jurnal Multidisiplin Ilmu
Publisher : CV. Multi Kreasi Media

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Machine reliability in production units is an important aspect in ensuring productivity and efficiency in various industrial sectors. The purpose of this study is to focus on improving reliability. The Failure Mode and Effect Analysis (FMEA) method is used to analyze as an effort to improve machine reliability. FMEA provides a comprehensive understanding of reliability improvement strategies by strengthening reliability prediction and preventive maintenance strategies. This method is also used to identify potential failures in the system, evaluate their impact, and design effective maintenance strategies. Results and Discussion showed that the Mazak Variaxis CNC milling machine had the highest percentage of problems, reaching 40% based on downtime and frequency of occurrence in the prismatic cell. Based on the FMEA analysis, the main failure mode was identified through the calculation of the Risk Priority Number (RPN) with the highest values ​​of 126 (rank 1), 120 (rank 2), and 105 (rank 3). RPN values ​​greater than 87.93 are categorized as critical failures. The ATC (Automatic Tool Changer) component occupies a crucial position with the highest percentage of component problem factors, reaching 129%. Conclusion: By using an empirical approach, the proposed implementation of actions as an effort to reduce the RPN number and increase machine reliability by prioritizing problems based on the RPN value scale, increasing the intensity of preventive maintenance scheduling and periodic replacements, and planning spare parts stock.
Co-Authors Hardiyanti, Nina Munir Fahmi, Mokhammad sutiana