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All Journal Rotasi Jurnal Simetris Rekayasa Mesin VANOS Journal of Mechanical Engineering Education Journal of Science and Applicative Technology INVOTEK: Jurnal Inovasi Vokasional dan Teknologi Jurnal Tekno Insentif Jurnal Teknologi Terapan Journal of Renewable Energy and Mechanics APTEK G-Tech : Jurnal Teknologi Terapan Quantum Teknika Jurnal Vokasi Mekanika Sinergi Polmed : Jurnal Ilmiah Teknik Mesin AMMA : Jurnal Pengabdian Masyarakat Majalah Teknik Mesin
Dicky J. Silitonga
Teknik Mesin, Institut Teknologi Sumatera, Lampung Selatan, Indonesia 35365
Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing Social Sciences Transportation

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Analysis of Biomass Briquettes Made from Rubber Seed Shells and Acacia Sawdust with Variation in Material Composition Percentage Alfian, Devia Gahana Cindi; Sindhu, I Gede Pande Naraya; Paundra, Fajar; Silitonga, Dicky Januarizky; Nugraha, Andhyka Tyaz
invotek Vol 25 No 2 (2025): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v25i2.1209

Abstract

Indonesia is reducing reliance on fossil fuels by expanding renewable energy, including biomass from rubber-plantation residues and acacia wood. This study evaluates briquettes made from rubber seed shell (RSS) and acacia sawdust (AWS) using 10% tapioca binder, a compaction pressure of 50 kgf cm⁻², and drying at 100 °C for 3 h. Three compositions (RSS:AWS, %wt) were tested: A (50:50), B (70:30), and C (80:20). The best performance was obtained for C (80:20), with moisture 7.40%, volatile matter 9.56%, ash 4.47%, fixed carbon 85.95%, HHV 6,716.88 cal g⁻¹ (28.10 MJ kg⁻¹), and burn rate 0.10 g min⁻¹. All compositions satisfied SNI 01-6235-2000 limits for HHV (≥ 5,000 cal g⁻¹), VM (≤ 15%), and ash (≤ 8%); the moisture criterion (≤ 8%) was met by B and C. For context, SNI 1683:2021 (wood charcoal, not briquettes) imposes stricter thresholds; under these, C is closest to First-Quality ranges, while A and B fall short for several parameters. Overall, increasing the RSS (char) fraction produced briquettes with lower moisture and VM, higher fixed carbon and HHV, and steadier combustion suitable for household fuel.
Experimental Study Of Wear Testing Of ASTM 440C Steel On A Ball-On-Disc Tribometer Using Variations Of Lubricants Sitorus, Jhonatan Jufrianto; Silitonga, Dicky Januarizky; Kolala, Putra Andi; Afisna, Lathifa Putri; Alfian, Devia Gahana Cindi
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 4 (2025): Jurnal Vokasi Mekanika
Publisher : Departemen Teknik Mesin Fakultas Teknik Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i4.896

Abstract

Bearings are important components in industry that function to reduce friction between moving parts for smoother and more efficient movement. However, friction that occurs can cause wear on the bearing surface. This study aims to analyze the wear volume, wear width, and wear rate of ASTM 440C steel material with variations of SAE 10W-30, SAE 10W-40, and SAE 140 lubricants at rotational speeds of 180 rpm, 270 rpm, and 310 rpm. Testing was carried out using a tribometer. ball-on-disc with a constant time of 10 minutes. The test results showed that the lowest wear width was obtained in SAE 10W-40 lubricant of 259.806 µm at 180 rpm, while the highest value of 417.894 µm also occurred in SAE 10W-40 at 270 rpm. The lowest wear volume was recorded in SAE 10W-40 of 0.0225 mm³ at 180 rpm, while the highest was 0.0942 mm³ at 270 rpm with the same lubricant. For the wear rate, the lowest value of 0.50 × 10⁻⁸ g/mm²·s was found in SAE 140 lubricant at 180 rpm, while the highest was 1.58 × 10⁻⁸ g/mm²·s occurred in SAE 10W-40 at 270 rpm. Overall, SAE 10W-40 lubricants are more suitable for use at low revs, while SAE 140 lubricants are recommended for high revs due to their greater viscosity and resistance to wear.
Co-Authors Abdul Muhyi Aditia Prahmana, Rico Ahmadien, Ichwan Kurnia Aji, Ahmad Frantoni Andhyka Tyaz Nugraha Andi Kolala, Putra Auriyani, Wika Atro Carlodinho, Samuel Chaniago, Noverto Zhorif Devia Gahana Cindi Alfian Devy Setiorini Sa’adiyah Didik Supriyadi Didik Supriyadi, Didik Dwi Hartanto Eko Pujiyulianto Fajar Paundra Firjatullah, Ahmad Labib Furkhan, M. Aulia G., Gita Christo Gahana Cindi Alfian, Devia Hidayatullah, M Taufik Jehuda, Marthin Juhensen, Jodi Kardo Rajagukguk, Kardo Khaira, M. Irsyad Bin Iskandar Khariman, Muhammad Nur Na’im Kolala, Putra Andi Lasimin Lathifa Putri A Lathifa Putri Afisna Manurung, Daniel Marcellino, Andrean Mardhiyana, Dewi Marone J Tambunan Meliala, Arvin Ade Guna Muhammad Syaukani Muhyi, Abdul Munisamy, Loganraj Nanda Syanur, Farid Nasution, Nur Baiti Nicholas Binsar Pandapotan Nurullah, Fajar Perdana Paundra, Fajar Perdana Nurullah, Fajar Petrus, Bastian Roni Prahmana, Rico Aditia Prasetyo, Tri Wahyu Pujiyulianto, Eko Riayatsyah, T. M. Indra Rico Aditia Prahmana Rifqi Sufra Samarul Fuad, Muhammad Zamir Aizat Sindhu, I Gede Pande Naraya Sitanggang, Feldrico Andreas Sitorus, Jhonatan Jufrianto Sui, Jing Xian Taurista Perdana Syawitri, Taurista Perdana Yunasdi, Hamda Yusupandi, Fauzi