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All Journal ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Kumawula: Jurnal Pengabdian Kepada Masyarakat Jurnal Mekanik Terapan Jurnal Polimesin
Herman Budi Harja, Herman Budi
Politeknik Manufaktur Negeri Bandung
Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Journal : Jurnal Polimesin

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Development of an embedded coolant system incorporat-ing minimum quantity lubrication for CNC milling applications Hendrawan, Yogi Muldani; Pratama, Andri; Ihsyani, Taufik Abdul Karim; Ruswandi, Ruswandi; Harja, Herman Budi
Jurnal Polimesin Vol 23, No 5 (2025): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i5.7073

Abstract

Machinery applications often generate excessive heat due to friction between cutting tools and work-piece materials. To mitigate heat and friction, the use of coolant is necessary in machining operations. Wet coolant systems risk environmental and health concerns because of their consumption rates and chemical content whose  waste requires recycling, a process that consumes additional energy and contributes to increased carbon emissions. As a sustainable alternative, the Minimum Quantity Lubrication (MQL) method supplies a fine mist of lubricant in minimal volumes, thereby reducing waste while enhancing machining performance. This study aims to develop an Embedded Coolant System (ECS) based on the MQL method for CNC milling machines, ensuring both ease of integration and effective cooling performance. The ECS was designed with a simplified open-loop controller using an Arduino Mega 2560, a peristaltic pump, and air-pressure control to regulate the coolant mist. Initial calibration was conducted to establish the coolant flow-rate equation as a function of motor speed. Experimental validation was carried out using aluminum and ST-37 steel with HSS and carbide tools, comparing conventional air-pressure cooling (APC) and the proposed MQL-ECS. The results demonstrate that the MQL-ECS significantly reduces machining temperatures and improves surface roughness compared with APC. For aluminum, the average temperature decreased by up to 3% from 30.3 oC, while surface roughness improved by 31% from 1.1µm. For ST-37, the temperature decreased by 5.5% from 31.1 oC, and surface roughness improved by 72.74% from 5.96 µm. These findings confirm both the effectiveness and environmental benefits of the proposed system, providing a feasible solution for modern CNC operations.
Design and development of a radial air bearing concave profile for an educational tool Harja, Herman Budi; Febriani, Risky Ayu; Saksono, Novi; Diratama, M Yazid; Fauzi, M
Jurnal Polimesin Vol 23, No 5 (2025): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i5.7216

Abstract

The increasing demand for high-speed, precision machinery has highlighted the limitations of conventional friction and anti-friction bearings, driving the need for more advanced bearing technologies, such as air bearings. However, achieving competency and skills related to air bearing components is difficult to access, particularly radial air bearing rigs. This paper presents the design of a radial air bearing rig as a learning tool to support educational objectives in understanding the working principles, use, and maintenance requirements of air bearing systems. The design stages use the VDI 2222 methodology and utilize SolidWorks for modeling. Air quality specifications refer to the ISO 9001:2015 – New Way Air Bearings standards, which consist of a fly height of 5μm, with operational parameters of 4–6 Bar input pressure and 2–13 LPM flow rate. The rig uses a single-phase motor for shaft rotation and a porous pad for air distribution. The test results show that the rig achieves a fly height of 0.5 μm at 4 Bar pressure and 5 LPM flow rate, although its rotation exhibits resistance. These outcomes confirm the rig’s potential as an educational tool and highlight the need for mechanical improvements to enhance its performance.
Co-Authors Andri Pratama Daian, Ilham Ramdani Dhion Khairul Nugraha Diratama, M Yazid Diratama, Mohammad Yazid Elfrida Ratnawati FATHAN, ASEP Fathurohman, Muhamad FATURROHMAN, MUHAMMAD Febriani, Risky Ayu Fitria Suryatini hadiani, dini Hendrawan, Yogi Muldani Ihsyani, Taufik Abdul Karim M Fauzi, M Mohammad Fauzi Noviandani, Pradika Ruswandi Ruswandi Saksono, Novi