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All Journal Jurnal Rekayasa Mesin Jurnal Engine: Energi, Manufaktur, dan Material Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Proceeding ISETH (International Summit on Science, Technology, and Humanity)
Setiawan, Widia
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Social Sciences Other

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Analisis Re-Layout Line Machining Oil Separator dengan Metode Value Stream Mapping dalam Meningkatkan Efisiensi Produktivitas di PT Astra Otoparts Divisi Nusametal Rasyid, Adji Nur; Hendaryanto, Ignatius Aris; Setiawan, Widia; Winarno, Agustinus
Jurnal Engine: Energi, Manufaktur, dan Material Vol. 8 No. 2 (2024)
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jeemm.v8i2.1848

Abstract

The Oil Separator is a part produced by PT Astra Otoparts Nusametal Division. The products are manufactured on the machining line. The production process of part oil separator through several stages including CNC milling and lathe machining, washing part, and part verification process. Line machining oil separators have been found to have waste problems, namely moving manpower, waiting time process, and inappropriate processing, causing work imbalances in the production process. The job imbalance causes the daily production target not to be achieved as the company planned, so the customer needs cannot be met. The problem in this study was solved using the value stream mapping method to analyze the waste occurring and the impact resulting from the relayout line machining oil separator. The waste analysis is done by spreading questionnaires, waste weighting, value stream analysis tools selection (VALSAT), and cause analysis with fishbone diagrams. After that, some improvements were made to reduce the waste. Implementation of improvements resulted in a reduction in the number of work processes from 72 to 47. Thus, the lead time for process line machining oil separator decreased from 521 seconds/cycle to 444 seconds/ cycle with an increase in the total process cycle efficiency of 8.67%. In addition, the productivity of the previous average number of parts of 6575 pcs/day was increased to 7024 pcs / day and the manpower was reduced from five manpowers/day to three manpowers/day. Keywords: Process Cycle Efficiency, Re-layout, VALSAT, Value Stream Mapping
Perancangan Sistem Ekstruder untuk 3D Printer Cokelat Pambudi, Abim Adhanis; Bekti Wibowo, Setyawan; Setiawan, Widia; Danny, stephanus
Jurnal Rekayasa Mesin Vol. 19 No. 2 (2024): Volume 19, Nomor 2, Agustus 2024
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v19i2.5099

Abstract

The chocolate 3D printer is one such development, designed to assist humans in creating objects using chocolate as the base material. Chocolate 3D printers can produce a wide range of creative objects according to user preferences. This research project began with the design of the extruder components to be used in the chocolate extrusion process of the 3D printer. The components utilized in this design include the barrel and nozzle, Nema 17 stepper motor, 150 W 24 V silicon heater, single screw, hopper, and bracket. The design process was tailored to meet the specific requirements and objectives of this research. Experimentation will be conducted on the extruder by introducing variations in its printing speed. The research results indicate that the extruder can perform the extrusion process effectively using the mentioned components. At a temperature of 40 degrees Celsius and a print speed of 100 mm/s, the chocolate melt consistently flows out.
Inventory Management and Proactive Maintenance to Enhance Operational Efficiency in Excavators: Focus on Common Spare Parts Issues Surojo; Setiawan, Widia; Harjono; Santosa, Nugroho; Winarto, Felixtianus Eko Wismo; Mandala, Wirawan Widya
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & Inovasi Volume 7 Number 1 (2025)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v7i1.7770

Abstract

Effective inventory management and maintenance are critical for the operational efficiency of heavy equipment such as excavators. This study focuses on optimizing spare parts inventory for Cummins diesel engines using the min-max stock method. It aims to improve inventory control by categorizing spare parts into slow-moving, medium-moving, and fast-moving components and addressing maintenance issues that impact performance. The research utilized the min-max stock method to determine optimal inventory levels, ensuring spare parts availability while minimizing holding costs. Key maintenance issues in components such as track shoes, cam shafts, rear shafts, motor starters, and exhaust manifolds were identified through inspections. Advanced diagnostic tools, including vibration analyzers and thermal imaging, were used for proactive maintenance. The study identified critical wear and damage in components like track shoes, cam shafts, and exhaust manifolds, which could lead to equipment failure if not addressed. Implementing the min-max stock method helped reduce stockouts and overstocking, ensuring an optimal balance in inventory. The results demonstrate that integrating the min-max stock method with systematic maintenance practices significantly improves operational efficiency. The use of real-time diagnostic tools enabled early issue detection, reducing downtime and maintenance costs. This study emphasizes the importance of inventory optimization, regular inspections, and timely maintenance interventions for enhancing equipment reliability. Future research should explore predictive maintenance technologies to further refine inventory and maintenance strategies in the heavy equipment sector.
Lap Joint Carbon Steel ST 37 and Aluminum 6061 with Friction Stir Welding (FSW) Setiawan, Widia; Darmadi, Djarot B.; Suprapto, Wahyono; Soenoko, Rudy
Proceeding ISETH (International Summit on Science, Technology, and Humanity) 2016: Proceeding ISETH (International Conference on Science, Technology, and Humanity)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/iseth.2361

Abstract

In this research, Aluminum 6061 and Carbon steel ST 37 sheet were lap joined by friction stir welding. A hardened medium carbonese steel (EMS 45) was used as rotary Probe. The microstructures of the joining inter-metallic compounds were observed by scanning electron microscopy, microstructure photograph, and micro-hardness tests. The joint strength was evaluated by shear stress tests. The experiment was performed with varied length of pin probe 6, 7, and 8 mm, equal rotational speed of 2500 rpm, and welding speed (15 mm/minutes). The Inter-metallic compounds of aluminums sheet was cut off the pin probe and the mixture on the Carbon steel ST 37. Intermetallic compounds were analyzed on its micro sructure in this region aluminum and carbon steel mixed, the value joint tensile shear 6.2KN.
Co-Authors Aji, Muhammad Sulistiyo Alamin, Rachmat Bekti Wibowo, Setyawan Danny, stephanus Djarot B. Darmadi, Djarot B. Felixtianus Eko Wismo Winarto Harjono Ignatius Aris Hendaryanto Jibril Maulana Mandala, Wirawan Widya Nugroho Santoso Pambudi, Abim Adhanis Radhian Krisnaputra Rasyid, Adji Nur Rudy Soenoko Santosa, Nugroho Surojo Surojo, Surojo Tarmudi, Achsan Wahyono Suprapto Winarno, Agustinus Winarto, Felixianus Eko Wismo Wiyadi Wiyadi