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Jurnal Sistem Teknik Industri
Published by Universitas Sumatera Utara
ISSN : 14115247     EISSN : 25279408     DOI : -
Core Subject : Science, Engineering,
Control & Systems Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering
Jurnal Sistem Teknik Industri (JSTI) of Universitas Sumatera Utara, Faculty of Engineering, Department of Industrial Engineering, was published in 1998. Until now, the number of publications has reached 21 volumes, each of which is published by TALENTA Publisher twice a year . Each volume has two publishing numbers, namely January issue numbers and July issue numbers.
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Articles 222 Documents
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Planning of a Preventive Maintenance System for Lathe Machines Using the RCM II and FMECA Adsa, Fattah Fadjrir; Ishak, Aulia; Anizar
Jurnal Sistem Teknik Industri Vol. 28 No. 1 (2026): JSTI Volume 28 Number 1 January 2026
Publisher : TALENTA Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsti.v28i1.23630

Abstract

Unplanned downtime and ineffective maintenance strategies remain major challenges in improving the reliability of production machinery in manufacturing industries. This study proposes a structured preventive maintenance system for a CW6293 lathe machine by integrating Reliability Centered Maintenance II (RCM II) and Failure Mode, Effects, and Criticality Analysis (FMECA). The novelty of this research lies in the systematic integration of risk-based criticality assessment, statistical reliability modeling, and maintenance task selection to develop an optimized maintenance framework. FMECA is employed to prioritize components based on severity, occurrence, and detection attributes, identifying the gearbox as the most critical component. Reliability analysis using Time Between Failure (TBF) and Time To Repair (TTR) data is conducted to determine appropriate maintenance intervals through Weibull and Normal distribution modeling. The RCM II decision logic is then applied to translate reliability characteristics and failure consequences into specific maintenance actions, namely scheduled discard and scheduled restoration tasks. This integrated approach enables the development of a proactive maintenance system that improves decision-making accuracy, enhances machine reliability, and supports a transition from reactive to risk-based preventive maintenance. The proposed framework demonstrates practical applicability for manufacturing environments and contributes to the advancement of maintenance engineering by combining reliability analysis, criticality evaluation, and structured maintenance policy design.
Quality Control Analysis Using the Seven Tools and Kaizen Methods to Minimize Terminal Defects in the Crimping Process Al-Bar, Arba; Tjahyono, Rudi
Jurnal Sistem Teknik Industri Vol. 28 No. 1 (2026): JSTI Volume 28 Number 1 January 2026
Publisher : TALENTA Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsti.v28i1.23738

Abstract

Product quality control plays a crucial role in maintaining competitiveness in manufacturing industries, particularly in high-volume production processes where minor defects can significantly affect product functionality. This study analyzes quality issues in the crimping process of wiring harness terminals at PT XYZ, where 1,170,016 terminals were produced over an eight-month period, resulting in 1,755 defective units (0.15%). The Seven Tools method including check sheets, histograms, scatter diagrams, control charts, pareto diagrams, fishbone diagrams, and stratification was employed to identify defect types and root causes. The analysis revealed that “too short” defects were the most dominant, accounting for 69.17% of total defects. The p-chart control chart indicated that the defect proportion fluctuated beyond control limits in several periods, signaling process instability. Furthermore, root cause analysis identified five main contributing factors: human, material, method, machine, and environment. Based on these findings, improvement proposals were formulated using the Kaizen approach through the Five-Step Plan and Five-M Checklist, focusing on standardization, training, preventive maintenance, and workplace organization. The proposed improvements are expected to enhance process stability, reduce defect occurrence, and support continuous quality improvement in the crimping process.

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