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All Journal JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY TEKNOSAINS: Jurnal Sains, Teknologi dan Informatika
Oleh
Universitas Singaperbangsa Karawang
Energy Industrial & Manufacturing Engineering Mechanical Engineering

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Production Process of Making Custom Part Rotary Housing on Milling Machines at PT. Anugrah Petrindo Moratama Johannes Pietra Simamora; Oleh; Tee Boy Jhonson Simamora
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 10 No. 1 (2026): June 2026 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v10i1.16406

Abstract

This internship was conducted at PT. Anugrah Petrindo Moratama, a company engaged in engineering and manufacturing. The purpose of this activity was to understand the production process of manufacturing a custom Rotary Housing part using lathe and milling machines. The methods applied included direct observation, primary data collection, and comparative analysis between theoretical knowledge and field practice. The main material used was Gray Cast Iron due to its suitable mechanical properties for Rotary Housing components. The production process consisted of client request handling, product design using software, raw material selection, engineering processes using lathe and milling machines, and quality control stages. The calculation results show that cutting speed and spindle rotation significantly affect production time; the higher the RPM, the shorter the machining duration. This internship provided practical experience for students to understand the real application of production process theory and broaden their knowledge of manufacturing industry operations.
Design and analysis of refrigerator cooling load for fruit and vegetable storage in tropical climate Kahfi Alwi Kasim; Boni Sena; Oleh; M. Keitaro Ramadhan; Alwi Azwar Anas; Angga Muhamad Najib
TEKNOSAINS : Jurnal Sains, Teknologi dan Informatika Vol 13 No 2 (2026): TEKNOSAINS: Jurnal Sains, Teknologi dan Informatika
Publisher : LPPMPK- Universitas Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/tekno.v13i2.2320

Abstract

This study proposes a domestic refrigerator design based on Phase Change Material (PCM) integration to improve fruit and vegetable storage performance in tropical climates with high temperature and humidity. The study was conducted in two representative conditions, namely Karawang (high temperature) and Banjarmasin (high humidity). The methodology includes thermodynamic-based cooling load analysis (transmission, product, and infiltration load), the use of BMKG climatology data, and three-dimensional geometric modeling using SolidWorks. A 15 mm thick RT4/RT5 PCM was integrated into the cabinet wall as a thermal buffer to reduce temperature fluctuations. The results show that the total cooling load is 103.58 W (Karawang) and 102.42 W (Banjarmasin), respectively, with transmission load dominating at high temperature conditions and a 7.5% increase in latent infiltration load at high humidity conditions. The system is then designed using a 1/8 HP compressor with R134a refrigerant, resulting in a theoretical COP of 3.59. The key findings demonstrate that the integration of PCM into a hybrid wall structure is effective in stabilizing internal temperatures and improving the system's resilience to variations in environmental thermal loads. This approach provides a relevant design contribution to the development of domestic refrigerators in extreme tropical regions
Co-Authors Alwi Azwar Anas Angga Muhamad Najib Boni Sena Johannes Pietra Simamora Kahfi Alwi Kasim M. Keitaro Ramadhan Tee Boy Jhonson Simamora