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All Journal IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA)
Tandio, Joseph Wicaksono
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Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Optimasi Persediaan untuk Ketersediaan Perkakas Kerja di Bengkel Otomotif Pratomo, Hariyo P. S.; Hernando, Ivan Christian; Rudijanto, Matthew Jeffrey; Tandio, Joseph Wicaksono
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.342

Abstract

Automotive workshops commonly face inefficiencies in special-tool availability due to manual and non-transparent tracking systems. This study addresses this challenge by examining the impact of limited tool quantities on operational performance, particularly the low average service level (86.18% vs. the 95% target). This study is among the first to integrate a digital tool management system with quantitative inventory-optimization methods, i.e., Safety Stock and Cost-Benefit Analysis (CBA), in an automotive workshop context. Borrowing-transaction records collected over 60 days were analyzed to identify critical tools with the highest demand variability. Although most tools achieved full availability, 15 high-demand tools contributed to reduced overall service level and were therefore prioritized in the optimization process. Application of Safety Stock analysis recommended ideal inventory quantities, while CBA revealed diminishing-return thresholds, preventing unnecessary investment. Key improvements include increasing service level from 71.27% to 99.51% and enhancing cost efficiency to 89.04%. The combined digital recording system and quantitative optimization framework have proved highly effective in improving tool availability and reducing operational costs. This approach offers a scalable model for automotive workshops seeking to enhance efficiency and sustainability through data-driven tool-management strategies.
Co-Authors Hernando, Ivan Christian Pratomo, Hariyo P. S. Rudijanto, Matthew Jeffrey