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Rancang Bangun Alat Sentrifugal Semi-otomatis Kapasitas 1 kg Rochaman, Nur; Sakti, Arya Mahendra; Wulandari, Diah; Riandadari, Dyah
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.v10i03.73588

Abstract

This research aims to design and assemble a semi-automatic centrifuge with a capacity of 1 kg that functions to separate liquid and particles in soy milk by utilizing centrifugal force. The need for this tool arises because commercial centrifuges are expensive, have limited capacity, and are less suitable for learning activities in educational laboratories and small-scale industries. The research method applies a Research and Development (R&D) approach that includes literature review, component design, assembly, functional testing, and evaluation of results. This tool is made using a 0.5 HP AC motor equipped with a speed controller via a dimmer and a pulley and V-belt-based transmission system. Tests were carried out at three variations of engine speed (700, 900, and 1100 rpm) and operating duration (15, 20, and 25 minutes) using soy milk samples. The test results show that the tool can run stably and successfully separate liquid from soy milk particles, as indicated by the formation of separate clear and creamy liquid layers. This research provides a contribution in the form of a prototype centrifuge that is economical, has a larger capacity, and is easy to use, so it has the potential to be a practical tool in educational laboratories and technology that is suitable for small-scale industries.
Analisis Biaya Produksi Mesin Ball Mill Skala Laboratorium Alfie, Fahmi Putra; Fitri Ganda, Andita Nataria; Sakti, Arya Mahendra
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.v10i03.73706

Abstract

The ball mill is one of the essential machines used to reduce material size to the micro and nano scale. At the laboratory level, this machine is highly beneficial for research and technology development, yet its production cost often becomes a challenge. This study aims to analyze the production cost of a laboratory-scale ball mill in detail as a reference for more efficient planning. The research method applied an experimental approach by directly manufacturing one unit of the ball mill, starting from design planning, material procurement, fabrication process, up to cost calculation. All data covering material requirements, labor costs, and process expenses were calculated based on manufacturing standards. The results showed that the total production cost of the laboratory-scale ball mill was IDR 3,807,491, consisting of material costs of IDR 3,094,600, process costs of IDR 512,891, and planning costs of IDR 200,000. With a profit margin of 35%, the recommended selling price was IDR 5,140,112 per unit. This study emphasizes the importance of production cost analysis as a basis for budget control, price determination, and machine development strategies at both laboratory and small-scale industrial levels.
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.
A Pengujian Vibrasi Pada Pompa Sentrifugal Sebagai Langkah Preventif Untuk Menjaga Stabilitas Kinerja Pompa DWI LESMANA, DIO; NAHRUDIN IBAD, MUHAMAD; MAHENDRA SAKTI, ARYA
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.v11i01.74335

Abstract

Centrifugal pumps are essential equipment in industrial systems that function to continuously transfer fluids. The reliability and stability of pump performance are strongly influenced by mechanical conditions during operation, particularly in rotating components such as bearings. Mechanical disturbances in pumps are often not visually detectable at an early stage; therefore, an effective condition monitoring method is required. This study aimed to evaluate the performance condition of a centrifugal pump through vibration testing as a preventive maintenance approach. The method used was vibration measurement employing a VibXpert 2 device with vibration velocity parameters based on Root Mean Square (RMS) values. Measurements were conducted at the pump bearings in three directions: vertical, horizontal, and axial. The test results showed vibration values of 0.360 mm/s in the vertical direction, 0.815 mm/s in the horizontal direction, and 0.518 mm/s in the axial direction. All measured vibration values were below the threshold limits specified in the ISO 10816-3 standard for group 2 machines with rigid foundations. Based on these results, it was concluded that the centrifugal pump condition remained within a safe category or new machine condition. Vibration testing was proven to be an effective condition monitoring method to maintain performance stability and prevent early failure in centrifugal pumps.
Analisis pengaruh kecepatan dan lama waktu putaran alat sentrifugal terhadap viskositas susu kedelai maulana, Faiz sahrullah; Sakti, Arya Mahendra; Sofi, Nurul Ainu; Riandadari, Dyah
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.v11i01.74419

Abstract

This study aims to analyze the effect of variations in rotational speed and centrifugation time on the viscosity and quality of soy milk. The centrifugation process was applied to accelerate the separation of liquid and solid phases (okara) in order to improve the physical quality of soy milk. The research was conducted using an experimental method with three rotational speed variations, namely 700 rpm, 900 rpm, and 1100 rpm, and three centrifugation time variations of 15 minutes, 20 minutes, and 25 minutes. The observed parameter was the viscosity value of soy milk. The results showed that increasing rotational speed and centrifugation time significantly affected changes in viscosity. The lowest viscosity value was obtained at a rotational speed of 700 rpm, amounting to 14,531 cP, while the highest viscosity value was recorded at 1100 rpm, reaching 44,194 cP. The rotational speed of 900 rpm was considered the most optimal condition because it produced a balance in viscosity without causing excessive thickening. This study is expected to serve as a reference for determining optimal centrifugation operating parameters in soy milk processing, particularly for small- and medium-scale applications.
Analisis Pengaruh Variasi Kecepatan dan Karakteristik Roda Penggiling Terhadap Kapasitas Hasil Penggilingan Dimas Aryaputra; Arya Mahendra Sakti; Dyah Riandadari; Nurul Ainu Sofi
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

Abstract

Optimizing the processing of agricultural waste, especially peanut hulls, is a significant challenge inincreasing the economic value of food byproducts. This study aims to analyze the performance of a disc millthrough experiments exploring two key mechanical parameters: variations in shaft rotational speed and thegeometric characteristics of the grinding wheel (number of blades). Experiments were conducted using anFFC-15 machine, where the grinding wheel was varied to 2, 3, and 4 blades, combined with variations in shaftrotational speed of 2400, 2600, and 2800 rpm. The results showed a nonlinear phenomenon, namely thatincreasing the number of blades did not always increase efficiency. The 4-blade configuration actually causedair turbulence and flow resistance, thus reducing production capacity, while the 2-blade configurationtriggered the release of many fine particles. The best performance was achieved with a 3-blade configurationat 2800 rpm, which produced the highest grinding capacity of 0.095 kg per minute. This configuration offersthe best balance between impact frequency and material circulation space, thus becoming a technicalrecommendation for improving the efficiency of the husk waste processing machine.
Rancang Bangun Mesin Uji Abrasi Material Alumunium Terhadap Pelumasan Oli Eko Saputra, Aditiya Wahyu; Wulandari, Diah; Sakti, Arya Mahendra; Puspitasari, Dewi
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

Abstract

Abrasion is a common wear mechanism that occurs in machine components due to repeated frictional contact, particularly in aluminum materials that are widely used because of their light weight and corrosion resistance. Nevertheless, aluminum remains susceptible to wear when the lubrication system does not perform optimally. This study aims to design and develop a laboratory-scale abrasion testing machine and to analyze the effect of rotational speed on the wear behavior of aluminum 6061 under oil lubrication. The research employed a research and development method consisting of design, fabrication, assembly, functional testing, and abrasion testing stages. Abrasion tests were conducted at rotational speeds of 500, 1000, and 1500 RPM with a constant load of 3 kg, a test duration of 30 minutes, and Shell SAE 10W-30 oil as the lubricant. Quantitative data were obtained from the measurement of specimen mass loss before and after testing, while qualitative analysis focused on machine performance and operational stability during testing. The results indicate that the developed abrasion testing machine operated properly and was capable of producing consistent wear data. The mass loss of aluminum specimens increased with higher rotational speeds, with the highest average wear observed at 1500 RPM. This study contributes by providing a simple and cost-effective abrasion testing machine for laboratory applications and by offering insights into the influence of rotational speed on the wear behavior of aluminum under lubricated conditions.
Co-Authors Abdulloh, Isa Yuanata ADI PRANATA, ANGGA ADITAMA, RESKY Afdhol, Muhammad Zikri Afero Pranesti, Dennova Afghan, Fayyadh Buddy Al Afifah, Hidayanti Nuzulatul Aidah, M. Fishal Askarul Faris Aji Nugroho Al Falaq, Mochammad Rama Alam, Ilham Rofiqul Alfadilla, Muhammad Fajar Alfarizi, Edgar Hafizh Alfie, Fahmi Putra Alwi, Zyanata Hasna Andita Nataria Fitri Ganda Aprilianto, Mochammad Ismail Bagus Ardiansyah, Daniar Anggit ARMAN HIDAYAT, DENDI Arruafy, Mohammad Ghithrof Asmara, Anggurit Aji Bayu Asyhar, Achmad Hanif AZIZ MASHURI, ABDUL Bagus Afandi, Muhamad BAGUS PERMANA, AFIF Cahyo Nugroho, Cahyo Casillas, Muhammad Kanz DANANG PRIAMBODO, JAROT Danar Pratama, Sindhi Darmawan, Indra DERI SUBAYU, RHOMDAN Dewi Puspitasari Dewi Puspitasari Diah Wulandari DIDIN NURDIANSYAH, AHMAD Dimas Aryaputra DWI LESMANA, DIO DWI SUHARSONO, NASWAN Dyah Riandadari Eko Saputra, Aditiya Wahyu FAHMY SATRIADI WASKITO, YOGA Fajar, Rafianto Takbiral FANDI ZAMRUDDIN, MOCHAMMAD Farizi, Aziizun Faiq Al Fatahillah, Idham Rizki Yusma Ferly Isnomo Abdi Fikri, Zainur Rijalul Firdayansyah, Itok Maulana Firman Yasa Utama Firmansyah, Rian FIRSTA MARSYAH, ANGGI Fitri Ganda, Andita Nataria Ganda, Andita Ganda, Andita Nataria Fitri HAIKAL AMIN, FIKRI Hardinansya, Farid Aziz Hermawan, Dedy Andy Hidayat, Achmad Fachrus Hidayaturrahman, Hidayaturrahman Ibisono, Gigih Chandra Ilham, Muhammad Nur Ilhamsyah, Tegar Bayu INDRA NASUTION, DONNI ISWANTO, SYAHIDI Jalakusuma, Kevin Firdaus KHABIBULLAH, MUHAMMAD khuluq ma'addin, khusnul Kurnia Sandy, Muhammad Khoir Kurniawan, Prasetyo Tri Laksono, Alif Rahman Laksono, Teguh Setiawan Aldi Lanka, Linggar Anggita Cucu Manggalasari, Lena Citra Marwinsyah, Rizky Marzad, Deftana Aqsya maulana, Faiz sahrullah Ma’addin, Khusnul Khuluq Mujakki, Muhammad Akbar Murod, Moh Iqbal NAHRUDIN IBAD, MUHAMAD Nosuvian, Joko Laksono NOVEMIA HANY, FIRSTY Nur Rohman, Muhammad Nurul Ainu Sofi PRADIPTA BUANA, HABIB Priyambada, Sashatta Daniela Rachmattan, Ryan Ramadhan, Aldhi Fahrezy Ramadhan, Maulana Trisnanda Ramadhan, Yanuar Makhsinardi Ridho, Mukhlis Yazid Rizky Ramadhani, Muhammad Rizqullah, Ahmad Fakih Muhaimin Rochaman, Nur ROHMAN FAIZOL, ABDUL SAKIN NUR HAZNA, GALUH Saputra, Prihatama Wahyu SETYA PRAYOGO, ARNES Sofi, Nurul Ainu Solichudin, Fiqih Nur Sugiarto, Fikri Ariyadhana Sulistyorini, Elisa Trimariyono, Dimas Tsamroh, Dewi ‘Izzatus URFIE, FERDANSYAH WAHYU NUGROHO, MUHAMMAD WARJU Widoretno, Yustin Setiya Wildan Mufti Wirdana Wildan, Muhammad Wildan Satrio Bimo Wulandari, Cyndhi Kartika YOGA ARGE PUTRA, TRI Yolarinda, Dhiko Yulianto, Angki Narda