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All Journal Teknika Infotekmesin Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Jurnal Konversi Energi dan Manufaktur Jurnal Rekayasa Energi dan Mekanika Jurnal Altifani Penelitian dan Pengabdian kepada Masyarakat Joong-Ki : Jurnal Pengabdian Masyarakat Jurnal Sains dan Teknologi Joong-Ki Joong-Ki
Toni Okviyanto
Politeknik Negeri Sriwijaya
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Design of Coconut Milk Pressing Machine with Two Screw Shafts to Improve Extraction Efficiency and Quality Angga Setiawan; Rahmat Wijaya; Agus Subeno; Arif Budi Affandi; Toni Okviyanto; Fathan Mubina Dewadi
Jurnal Konversi Energi dan Manufaktur Vol. 11 No. 1 (2026)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.11.1.8

Abstract

Coconut milk pressing machines play an important role in coconut processing; however, conventional single-screw designs still face limitations related to pressure distribution and extraction stability. This study aims to design and analyze a coconut milk pressing machine, employing a counter-rotating two screw shafts configuration as an alternative to commonly used single-screw systems. The research methodology includes a reverse-engineering approach, analytical calculations to determine pressing capacity, power, torque, and pressure, and finite element analysis (FEA) simulations to evaluate the structural strength of main components. The analytical results indicate that the proposed design achieves a theoretical pressing capacity of 53 kg/h, with a shaft power requirement of 1.11 kW and a pressing pressure of 1.67 × 10⁵ N/m². FEA results show that the Von Mises stress and deformation remain below the allowable limits of the selected material, indicating a conservative, structurally safe design. All results presented in this study are theoretical and numerical in nature and have not yet been validated through experimental testing. The novelty of this work lies in the application of a counter-rotating two screw shafts configuration, which theoretically provides a more uniform pressure distribution than conventional single-screw systems without a significant increase in power consumption. Future work will focus on prototype fabrication and experimental testing to validate extraction performance, energy efficiency, and hygienic aspects.
Effectiveness of Epoxy Coating on Metal Surfaces of NEW773CAT Heavy Equipment Units Agus Subeno; Angga Setiawan; Toni Okviyanto; Herlin Sumarna; Dibyo Setiawan; Fauzi Widyawati
Jurnal Konversi Energi dan Manufaktur Vol. 11 No. 1 (2026)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.11.1.6

Abstract

This study investigates the effectiveness of the epoxy coating system on NEW773CAT heavy equipment unit operating in a mining environment. The research primarily focuses on the influence of surface preparation methods, dry film thickness (DFT), and coating type on corrosion resistance and adhesion strength. Field case studies, thickness measurements, and visual inspections were employed to assess the performance of coating system. The results reveal that average coating thickness of 396 μm significantly exceeds the minimum ISO 12944 category C5-I standard, which specifies a DFT of 320-400 μm for high corrosivity environments. The surface preparation process using high-pressure cleaning and power tool cleaning (ST 3.0) was found to produce an ideal substrate for epoxy coating application. The use of high-built epoxy mastic as the primer and Aliphatic Polyurethane as the top coat demonstrated excellent corrosion protection and optimal interlayer adhesion. The spray application technique resulted in a uniform coating with no visible defects. This study emphasizes the importance of combining effective surface preparation and precise coating specifications to ensure long-term protection of metal surfaces in harsh environments. The findings suggest that epoxy coating systems, when correctly applied and prepared, can provide robust protection against corrosion, extending the service life of heavy equipment exposed to aggressive conditions like those found in mining operations.
Protective Coating Performance on Industrial Components During Shutdown Maintenance Toni Okviyanto; Agus Subeno; Dibyo Setiawan; Fauzi Widiawati; Edward Simanjuntak; Otong Jaelani
Jurnal Konversi Energi dan Manufaktur Vol. 11 No. 2 (2026)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.11.2.6

Abstract

Corrosion protection is a critical aspect of industrial maintenance because coating quality directly influences equipment durability, operational reliability, and long-term maintenance efficiency. However, coating assessments in industrial practice often focus on compliance with thickness specifications without comprehensively evaluating the relationship between surface preparation quality, environmental conditions, coating thickness, and final coating performance under actual shutdown maintenance conditions. This study aimed to evaluate the effectiveness of the coating process during total plant shutdown (TPS) painting work on four industrial components: the sole plate sag mill, cover motor ball mill, base frame motor bubble crusher, and OHC girder. A field-based coating performance assessment was conducted using final painting reports, visual inspection records, environmental condition monitoring, surface preparation evaluation, and dry film thickness (DFT) measurements. Surface preparation was carried out using ST 3/SSPC-SP 3 mechanical cleaning, while coating performance was evaluated against the specified DFT requirements. The results showed that all inspected components satisfied the acceptance criteria, with primer DFT values exceeding 150 µm and final DFT values exceeding the minimum system requirement of 225 µm. Final coating thickness increased by 263–347 µm compared to the existing condition, indicating the formation of a protective coating layer. Nevertheless, noticeable thickness variations among measurement locations suggest opportunities for improving application consistency and process control. These findings demonstrate that the applied coating system met the specified performance requirements and provided effective corrosion protection under field conditions, while further optimization of coating application practices is required to achieve more uniform and efficient coating performance.
Analisis Kinerja dan Reduksi Emisi Karbon pada Mesin Pemipil Jagung Berbasis Energi Surya Toni Okviyanto; Hendradinata Hendradinata; Firdaus Firdaus; Tri Satya Ramadhoni; Agis Fika Wulandari; Indra Syahputra; Stevan Juliandro Aruan
Infotekmesin Vol 17 No 2 (2026): Infotekmesin: Juli 2026
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/

Abstract

Agricultural post-harvest operations require technological innovations that enhance productivity while reducing dependence on fossil fuels and environmental impacts. Although solar energy has been increasingly applied in agricultural mechanization, previous studies have primarily focused on technical performance or energy consumption, with limited attention to integrating machine performance evaluation and carbon emission reduction. This study aimed to evaluate the performance of a solar-powered corn sheller and assess its carbon emission reduction potential compared with a gasoline-powered sheller. A comparative experimental method was employed by analyzing shelling capacity, shelling efficiency, energy consumption, kernel damage, and carbon emissions using the Intergovernmental Panel on Climate Change (IPCC) emission factor. The results showed that the solar-powered sheller achieved a shelling capacity of 65 kg h⁻¹ and a shelling efficiency of 90%, which were comparable to the gasoline-powered sheller (69.67 kg/h and 91.67%, respectively). Moreover, the solar-powered system produced no direct operational carbon emissions, whereas the gasoline-powered sheller emitted 0.5082 kg CO₂ per 10 kg of processed corn. The novelty of this study lies in integrating technical performance evaluation with IPCC-based carbon emission analysis. This study provides a comprehensive evaluation framework to support the development of low-carbon agricultural mechanization based on renewable energy.
Co-Authors Agis Fika Wulandari Agus Subeno Agus Subeno Agus Subeno Angga setiawan Angga Setiawan Anjar Siti Mashitoh Arif Budi Affandi Asep Kurniawan Cahyo Wibowo Derry Murtadho Muthohhary Edi Kurniawan Edward Simanjuntak Fathan Mubina Dewadi Fauzi Widiawati Fauzi Widyawati Firdaus Firdaus Gurruh Dwi Septano Hanni Maksum Ardi Hendradinata, Hendradinata Herlin Sumarna Ilham Azmy Indra Syahputra MARIA BINTANG Meyci Trisna Mokhamad Munir Fahmi Nina Hartati Nor Fajri Otong Jaelani Purfaji Purfaji Putri Suijlia Rachmat Dwi Sampurno Rahmat Wijaya Rizal Jatnika setiawan, Dibyo Stevan Juliandro Aruan Taufikurrahman Taufikurrahman Tri Satya Ramadhoni Yudistira Anugrahadi Wiraputra Yuli Asmara Triputra Zenika Rizki Putra