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All Journal Jurnal Rekayasa Mesin Jurnal Teknik Mesin Jurnal Pendidikan Teknik Mesin R.E.M (Rekyasa Energi Manufaktur) Jurnal Mekanika: Majalah Ilmiah Mekanika Otopro Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Indonesian Journal of Engineering and Technology (INAJET) Madani: Multidisciplinary Scientific Journal Diversity Logic Journal Multidisciplinary Jurnal Ilmu Ekonomi, Pendidikan dan Teknik (IDENTIK) Jurnal Rekayasa Mesin
Firman Yasa Utama
Universitas Negeri Surabaya
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Identifikasi Masalah Air intake Dan Exhaust Serta Uji Dynotest Engine C15 Caterpillar Pada PT Trakindo Utama Surabaya Afero Pranesti, Dennova; Puspitasari, Dewi; Yasa Utama, Firman; Mahendra Sakti, Arya
Jurnal Rekayasa Mesin Vol 10 No 03 (2025): JRM Desember 2025
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jrm.v10i03.74025

Abstract

This study aims to identify problems in the air intake and exhaust systems and to evaluate the performance of a Caterpillar C15 diesel engine through engine dynamometer testing at PT Trakindo Utama Surabaya. The method involved technical observation, dynamometer testing under various load conditions, and analysis of engine performance parameters, including power, torque, engine speed, oil pressure, fuel pressure, and boost pressure. The test results indicate that increasing load leads to proportional increases in power, torque, and boost pressure, while engine speed decreases at high loads without indicating abnormalities in the lubrication and fuel supply systems. Problem identification reveals that performance degradation is mainly associated with the valve mechanism and combustion instability, as indicated by improper valve lash and excessive white smoke from the exhaust system. The application of step-by-step troubleshooting procedures in accordance with manufacturer specifications proved effective in determining appropriate corrective actions and restoring engine performance to optimal conditions. This study provides a solid technical basis for implementing preventive and corrective maintenance strategies for Caterpillar C15 engines in heavy-duty industrial applications.
The Effect of Chromium Coating Thickness on ST37 Material on Corrosion Rate Using the Linear Polarization Resistance (LPR) Technique Athallah, Jovano Cilion; Utama, Firman Yasa
Madani: Jurnal Ilmiah Multidisiplin Vol 3, No 12 (2026): January
Publisher : Penerbit Yayasan Daarul Huda Kruengmane

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.18639096

Abstract

ST37 low-carbon steel is widely used in construction and decorative applications such as house window grilles due to its good mechanical properties, ease of fabrication, and cost-effectiveness. However, this material has a major drawback in the form of low corrosion resistance, especially in open environments that are humid and contain chloride ions. One effort to improve the corrosion resistance of ST37 steel is through the chromium electroplating process. This study aims to analyze the effect of variations in chromium plating time on coating thickness and the corrosion rate of ST37 steel. The electroplating process was carried out using a chromium-based electrolyte solution with a constant voltage of 12 volts and plating time variations of 25, 35, and 45 minutes. The coating thickness was measured using a thickness gauge, while the corrosion rate testing was conducted using the Linear Polarization Resistance (LPR) method in accordance with ASTM G59 standards. The parameters analyzed included mass loss, polarization resistance, and corrosion rate in mm/year. The results showed that variations in plating time affect the coating thickness and corrosion rate of ST37 steel. The coating with a plating time of 35 minutes produced the lowest corrosion rate of 0.0099 mm/year, indicating higher corrosion resistance compared to the 25- and 45-minute variations. The 25-minute plating provided moderate protection, while the 45-minute plating showed a tendency toward increased corrosion rate due to the possible formation of micro-defects in the coating.
Analisis Variasi Tegangan dalam Proses Pelapisan Nikel-Krom Material ST37 terhadap Ketebalan dan Kekilapan Permukaan Octa, Moch. Hersan Maudian; Utama, Firman Yasa; Puspitasari, Dewi; Nugroho, Aji
Madani: Jurnal Ilmiah Multidisiplin Vol 4, No 1 (2026): February 2026
Publisher : Penerbit Yayasan Daarul Huda Kruengmane

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.18446547

Abstract

The advancement of manufacturing technology has driven the need for innovation in metal surface protection, one of which is through the electroplating method. This process uses electric current to deposit a coating metal onto the surface of a base metal, aiming to improve corrosion resistance, hardness, and surface aesthetics. Electrical voltage is a key parameter that influences the quality of the resulting coating. This study aims to analyze the effect of electrical voltage on the thickness and gloss of electroplated metal coatings. This study employed an experimental approach consisting of a literature review, problem identification, preparation of tools and materials, testing, and data analysis. The main equipment and materials used in this research included ST37 material, a DC power supply with voltage variations of 3 V, 6 V, and 12 V, electrodes, and an electrolyte solution composed of nickel and chromium. Data were obtained by measuring the coating thickness using a Thickness Gauge and surface gloss using a Gloss Meter for each voltage variation. The results of this study indicate that the applied voltage significantly affects the thickness and glossiness of the electroplated coating. The highest values were obtained at 6 V, with an average coating thickness of 20.80 µm and a gloss value of 566 GU, indicating the formation of a smooth and highly reflective surface.
Analysis of the Effect of Nickel–Chrome Electroplating Time Variations on Coating Thickness and Surface Hardness of ST41 Material Arjuna, Ifan Sheva; Utama, Firman Yasa; Puspitasari, Dewi; Nugroho, Aji
Madani: Jurnal Ilmiah Multidisiplin Vol 4, No 1 (2026): February 2026
Publisher : Penerbit Yayasan Daarul Huda Kruengmane

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

ST41 steel is a low-carbon steel widely used in the industry due to its toughness, but it has low surface hardness, making it less suitable for components subject to friction. To enhance these surface properties, an electroplating process is performed using nickel as the base layer and chromium as the top layer. This study aims to analyze the effect of varying electroplating time on the thickness and hardness of the ST41 steel surface layer. The research method used was an experiment with variations in nickel coating time of 30 minutes, 45 minutes, and 60 minutes at a voltage of 3 V and a temperature of 55 °C. Chrome plating was carried out for 10 seconds at a voltage of 12 V. Layer thickness testing was conducted using a coating thickness gauge, while surface hardness testing was performed using the Vickers method according to ASTM E384 standards with a load of 50 gf. The research results show that the coating thickness increases with longer plating time, from 18.18 µm at 30 minutes to 20.79 µm at 60 minutes. The highest surface hardness value was obtained at a plating time of 45 minutes, reaching 490.4 HV, then decreased at 60 minutes. This indicates that a plating time of 45 minutes is the most optimal condition for producing a nickel–chrome electroplated layer with the highest surface hardness on ST41 steel.
The Effect of Variations in Drying Time and Drying Methods on Paint Coating Gloss Value Using a Multifunction Spray Booth Bernatan, Juda; Utama, Firman Yasa
Madani: Jurnal Ilmiah Multidisiplin Vol 4, No 1 (2026): February 2026
Publisher : Penerbit Yayasan Daarul Huda Kruengmane

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.18464439

Abstract

Sand This study aims to analyze the effect of drying methods on drying time and gloss results during the painting process using a multifunction spray booth. Three drying methods tested were natural drying, forced air drying, and drying with a light bulb. The sample used was galvanized iron plates painted with Pilox spray paint and clear coat, then dried according to the applied method. Drying time was measured using a stopwatch, while gloss was tested using a gloss meter. The results showed that the light bulb method performed the best, with the highest gloss at all drying times tested. At drying times of 5 minutes, 10 minutes, and 15 minutes, the light bulb method produced 97.5 GU, 97.1 GU, and 96.9 GU, respectively. Forced air drying produced a gloss of 85.5 GU at 5 minutes, 87.7 GU at 10 minutes, and 88.9 GU at 15 minutes. Although its drying time was shorter than natural drying, the gloss produced was lower. Natural drying required a longer time of 15.42 minutes, with gloss results of 75.5 GU at 5 minutes, 78.9 GU at 10 minutes, and 85.7 GU at 15 minutes. From these results, it can be concluded that drying with the light bulb method is the best method in terms of both drying time and gloss quality, making it highly suitable for application in both industrial and small workshop scales.
RANCANG BANGUN MESIN PENCACAH RUMPUT GAJAH UNTUK PROSES PEMBUATAN SILASE PAKAN TERNAK SAPI Genta Arya Rahma Mahendra, Genta; Wulandari, Diah; Utama, Firman Yasa; Widoretno, Yustin Setiya
Jurnal Rekayasa Mesin Vol 11 No 01 (2026): JRM April 2026 (In Press)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jrm.v11i01.75196

Abstract

Silage is a method of providing cow feed that requires a forage chopping process so that it is easy to ferment and has a longer shelf life. However, most breeders still do the enumeration manually, so it takes a long time and the size of the enumeration is not uniform. Therefore, this study aims to design an elephant grass chopper with dual input and output funnels, equipped with a knife and a beater to speed up cutting and crush harder materials. This machine is expected to be able to produce a uniform size of 2–5 cm according to the SNI 7785.1:2003 standard This research method uses a 4D Research and Development (R&D) model to design and test a elephant grass chopper. The stages include literature review, design, machine construction and assembly, and then functional testing using elephant grass as the test material in three trials. The test data is analyzed to assess the machine's performance and feasibility. The results of the study show that the designed elephant grass chopper can operate well. Based on the function test at 1500 rpm with a test material load of 5 kg, the machine produces a chopping size of 2–5 cm with a working capacity of 92 kg/hour, so it is considered suitable for use to support the process of making silage for cattle feed and increase efficiency compared to manual methods.
Analisis Sudut Pisau Pada Mesin Pencacah Rumput Gajah Untuk Pembuatan Silase Pakan Ternak Sapi Nugraha, Muhammad Erlangga Adi; Wulandari, Diah; Utama, Firman Yasa; Nugroho, Aji
Jurnal Ilmu Ekonomi, Pendidikan dan Teknik Vol. 3 No. 1 (2026): IDENTIK - Januari
Publisher : CV. SINAR HOWUHOWU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70134/identik.v3i1.1285

Abstract

This study examines how the blade angle of an elephant grass chopping machine affects the chopping results used for making cattle feed silage. Elephant grass needs to be chopped to a standard size for silage production, with the ideal chop length ranging from 2–5 cm and relatively uniform, so that the fermentation process runs properly and the feed is easier for livestock to consume. The research was conducted using an experimental method with 1 kg of fresh elephant grass for each trial. The chopped output was classified into three size categories: <2 cm, 2–5 cm, and >5 cm, to determine which met the silage standard most effectively. The study tested three blade angles—30°, 45°, and 60°—and three machine rotational speeds (1700 rpm, 2000 rpm, and 2300 rpm) to evaluate their effects on chopping time, cut size distribution, and processing capacity. The results show that the best performance in terms of machine rotational speed at the 30° blade angle occurred at 2300 rpm. The highest percentage of chopped material within the 2–5 cm size range was obtained at a 45° blade angle, reaching approximately 55–58% of the total chopped output, indicating the most optimal conformity with silage size standards.
The Effect of Air Pressure and Nozzle Distance on the Quality of Water-Based Painting Using a Gravity-Feed Spray Gun Mochammad Hildad Ajiban; Heru Arizal; Rachmad Syarifudin Hidayatullah; Firman Yasa Utama
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 6 Nomor 1 Tahun 2024
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v6i1.5187

Abstract

Environmental influences can cause corrosion or damage to materials, which is why paint coating is used to protect them. Some of the factors that affect the quality of the paint are technical, such as setting the air pressure and spray gun nozzle spacing. The experimental research aims to determine how air pressures of 1.5, 2, and 2.5 bar and nozzle spacings of 10–15–20 cm affect the gloss and thickness of the water-based paint layer. A gravity-feed spray gun was used for this purpose. The luster test method uses an AMTAST AMN60 glossmeter with the ASTM D523-08 standard, and the thickness test uses a coating thickness gauge with the ASTM E 376-96 standard. The air pressure and the distance of the spray gun nozzle affect the gloss and thickness of the paint layer. Parameter 2 bar/15 cm yielded the highest gloss of 92.77 GU, while parameter 2.5 bar/10 cm resulted in the highest coating thickness of 0.26 mm.
Co-Authors 'Ilmi, Muhammad Iklil Ulil Achmad, Caesario Zakaria Afdhol, Muhammad Zikri Afero Pranesti, Dennova Ahmad Khusnul Hidayat AHMAD SAPUTRA, FANDY Aji Nugroho Akbar, Mokhamad Rizky Akhmad Hafizh Ainur Rasyid Andita Nataria F.G. Annisa Kesy Garside ARDI KUSUMA, JUAN Arifin, Ronald Akbar Arjuna, Ifan Sheva Arya Mahendra Sakti Athallah, Jovano Cilion Audyna Naomi, Irena Aufillah, Muhammad Husain Austin, Aqsha Parisya AZMI ROMADHON, MIFTAKHUL Bernatan, Juda BRAHMASETA HERMIANTO, KUSUMADETYA Caesario Zakaria Achmad Chinsa, Iqbal Rifky Dany Iman Santoso Dany Iman Santoso Darmawan, Indra Dewi Puspitasari DHIMAS WIDAYANTO, LUTHFI Diah Wulandari DWI PRATAMA, YAN Dyah Riandadari EKA ARISMA, NIKO Fahmi, Mochamad Amrizal Fajar, Rafianto Takbiral Fawzi, Ahmad Bahar Febrianto, Andrie Seva Ferly Isnomo Abdi Firmansyah, Rian Fitri Ganda, Andita Nataria Ganda, Andita Ganda, Andita Nataria Fitri Gegatama, Muhammad Henwa Genta Arya Rahma Mahendra, Genta GUNTUR CHRISARDY, ELISA HANAN ERITAMA, MUHAMMAD Hendra Wibowo Heru Arizal Hidayat, Ahmad Khusnul Huda Mei Setio Jalakusuma, Kevin Firdaus Juan Ardi Kusuma Khumaidillah, Moh. Rifqi Kurnia Sandy, Muhammad Khoir Kusuma, Juan Ardi Kusuma, Rachmad Andrian Jaya Manggalasari, Lena Citra Marzad, Deftana Aqsya Mochammad Hildad Ajiban Mohammad Irfan Muhammad Ibrahim Muhimatul Ulya Mukasafah Mujakki, Muhammad Akbar Mukasafah, Muhimatul Ulya Nadhdhif Fikri Ferdiansyah najimuddin, ahmad Nasrul, Nasrulloh Ibrahim Nugraha, Muhammad Erlangga Adi Nur, Muhammad Baihaqi Octa, Moch. Hersan Maudian Pamenang, Ferli Rycarhana Pata Ledi, Simon Aten Rachmad Syarifudin Hidayatullah rachmansyah, fajar Rahman, Muhammad rahmani willdanata Rasyid, Akhmad Hafizh Ainur RATRIKA RINA OKTAVIANI, DEVA RIZKY BACHTIAR, MOCH Rozi Ainurrochim, Miftachur Santoso, Muchammad Rafly Setio, Huda Mei Shadiq, Muhammad Difa Ash Shaid Khanafi Soeryanto Soeryanto Soeryanto Soeryanto Sugiarto, Fikri Ariyadhana Syafa'at, Rachmad Arif Tri Hartutuk Ningsih Umar Al Faruq WAHYU ARDYANTO, MUSLICH WARJU WARJU Wibowo, Hendra Widoretno, Yustin Setiya Wijatmiko, Fengki WIJATMIKO, FENGKI Winoto, Roy Ariel Yan Dwi Pratama Yulianto, Angki Narda ZAKARIA ACHMAD, CAESARIO Zulfa Sari