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Infotekmesin
Published by Politeknik Negeri Cilacap
ISSN : INFOTEKMES     EISSN : 26859858     DOI : -
Core Subject : Science, Engineering,
Computer Science & IT Electrical & Electronics Engineering Mechanical Engineering
INFOTEKMESIN is a peer-reviewed open-access journal with e-ISSN 2685-9858 and p-ISSN: 2087-1627 published by Pusat Penelitian dan Pengabdian Masyarakat (P3M) Politeknik Negeri Cilacap. The journal invites scientists and engineers to exchange and disseminate theoretical and practice-oriented in the various topics include, but not limited to Informatics, electrical Engineering, and mechanical Engineering.
Arjuna Subject : -
Articles 707 Documents
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Pengaruh Fraksi Volume dan Waktu Perendaman Serat Rami Terhadap Kekuatan Impak Sebagai Alternatif Material Skateboard Fina Andika Frida Astuti; Achmad Ali Ridho; Arif Rochman Fachrudin
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

Skateboards are typically made from maple wood, which is strong and flexible; however, its availability is not always guaranteed in terms of quantity or quality. One potential solution is the use of natural fiber-based composite materials, particularly ramie fiber, which is known to have higher impact strength than other natural fibers, making it suitable for skateboard applications that require high impact resistance. This study examines the effect of varying fiber volume fractions (25%, 45%, and 65%) and soaking durations in a 5% NaOH solution (2 hours, 3 hours, and 4 hours) on the impact strength of epoxy-matrix composites. Specimens were fabricated using the hand lay-up method and tested using the Charpy impact method in accordance with ASTM E23. Test results showed that the highest impact strength was obtained at a 65% volume fraction with a 3-hour immersion duration, at 0.08555 J/mm², while the lowest impact strength occurred at a 25% volume fraction with a 4-hour immersion duration, at 0.02823 J/mm². These results indicate that ramie fiber composites have the potential to be developed as a lighter and more environmentally friendly alternative material for skateboards.
Perancangan Mesin Kempa Panas Bambu Laminasi dengan Sistem Pemanas Elektrik Terintegrasi dan Pengempaan Hidrolik Radhian Krisnaputra; Galuh Bahari; Ilham Ayu Putri Pratiwi; Aris Hendaryanto; Sugiyanto Sugiyanto; Inggar Septhia Irawati; Ragil Widyorini
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

Most laminated bamboo production processes in small and medium-sized industries still rely on cold pressing, which requires long pressing times and often results in inconsistent bonding quality. This study aims to design a hot press machine by integrating a hydraulic pressing system, an electric heating system, and temperature distribution analysis using Computational Fluid Dynamics (CFD). The pressing system employs four hydraulic cylinders with a capacity of 15 tons and a maximum operating pressure of 110 bar, while the heating system requires 5.13 kW of power. CFD simulation results indicate a relatively uniform temperature distribution across the primary heating zone, although temperature gradients occur near the edges due to heat loss and the low thermal conductivity of bamboo. The proposed design satisfies the technical requirements of the laminated bamboo manufacturing process and has the potential to improve pressing uniformity and product quality, providing a foundation for the development of hot press machines for small- and medium-scale laminated bamboo industries.
Analisis Mekanisme Kegagalan Guide Vane dan Bottom Ring Akibat Erosi Sedimen pada Turbin Hidro Moh. Ali Sidik; Komarudin Komarudin
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

Sediment erosion is one of the primary causes of damage to the guide vane and bottom ring components of hydro turbines, resulting in reduced operational reliability and increased maintenance costs. Previous studies have mainly focused on coating materials, numerical simulations, or microstructural characterization separately, while the failure mechanism based on actual field damage has not been comprehensively explained. This study aims to investigate the failure mechanism of guide vane and bottom ring components subjected to sediment erosion using a forensic engineering approach. The investigation involved visual inspection, in-situ hardness testing, Micro Vickers hardness testing, and microstructural analysis using Scanning Electron Microscopy (SEM). The results revealed that the failure process initiated with the formation of microcracks in the protective coating, followed by coating adhesion degradation and coating spalling. Consequently, the exposed substrate experienced direct impacts from sediment particles, leading to crack propagation and progressive material loss. These findings provide a comprehensive understanding of the sediment erosion failure mechanism and can serve as a reference for improving inspection strategies, maintenance practices, and the durability of protective coatings in hydro turbines
Analisis Komparatif Metode Manufaktur Soft Pneumatic Actuator Berdasarkan Biaya, Waktu Fabrikasi, dan Karakteristik Mekanik Ilham Saputra; Irfan Bahiuddin; Bambang Hari Priyambodo; Efrem Olivio Gomes; Adhan Efendi
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

The rapid development of soft pneumatic actuators (SPAs) has driven a transition in manufacturing approaches from elastomer-based casting to additive manufacturing (AM). Although both methods have been widely adopted, systematic comparative studies to support manufacturing method selection remain limited. This study proposes a comparative evaluation framework to assess casting and additive manufacturing based on three key parameters: relative cost, fabrication time, and mechanical characteristics. The analysis was conducted through a structured literature review and semi-quantitative synthesis of 29 publications published between 2015 and 2025. The results indicate that casting provides lower material costs and superior structural homogeneity, whereas additive manufacturing offers greater design flexibility, more complex internal geometries, and higher production repeatability. The proposed evaluation framework provides a conceptual basis for selecting the most appropriate SPA manufacturing method according to application requirements, production scale, and available resources.
Analisis Keandalan Sistem Transfer Bulk Menggunakan Metode Reliability Centered Maintenance (RCM) Erwin Sutantyo; Purwanto Purwanto; Rahindra Bayu Kumara; Widar Bayu Wantoro; Irsat Surya Sekti; Wahyu Ari Putranto
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

The Bulk Transfer System on Supply Vessels plays a crucial role in supporting offshore logistics, particularly in transferring bulk cement to drilling facilities. The system operates on pneumatic principles and is influenced by compressors, piping networks, mechanical components, and control devices. However, the current maintenance approach remains reactive, increasing the risk of recurring operational failures. This study aims to evaluate system reliability and determine an optimal risk-based maintenance strategy using Reliability Centered Maintenance (RCM). The analysis includes system function identification, Failure Mode and Effect Analysis (FMEA), and Logic Tree Analysis (LTA). The results show that the transfer pipeline has the highest risk (RPN 48), followed by the air compressor unit, air receiver tank, and safety system (RPN 36). LTA indicates that most failures are evident with Operational Consequences, while safety system failures are categorized as Safety Consequences. The application of RCM effectively improves overall system reliability.
Optimization of Endmill Tool Life in Aluminum 6061 Milling Using Design of Experiments (DoE) and DMAIC Lean Six Sigma Dedhy Prihtiantoro; Agus Lutanto; Baharudin Priwintoko
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

Premature endmill failure in aluminum 6061 milling increases production costs, machine downtime, and surface quality variation. Previous studies have generally been conducted under laboratory conditions; therefore, they do not fully represent parameter variations, machine conditions, operator involvement, and monitoring limitations in industrial shop-floor environments. This study aims to identify the dominant factors affecting endmill breakage and to determine the optimum cutting parameters. The research method integrates DMAIC Lean Six Sigma, Design of Experiments (DoE), FMEA, ANOVA, and cutting force analysis. The results show that feed per tooth and depth of cut are the dominant factors affecting endmill breakage frequency. The optimum combination was obtained at the low cutting-speed level, feed per tooth of 0.10 mm/tooth, and depth of cut of 2 mm, with a predicted Breaks_out_of_10 value of 1.07. Based on the optimization model and cutting force analysis, this combination provides a predictive estimate of a 30–40% reduction in breakage compared with the baseline condition. The contribution of this study lies in integrating process improvement, statistical optimization, and mechanistic interpretation to support tool life control in industrial milling processes.
Pengaruh Rasio Massa Pineapple Leaf Fiber yang Rendah Terhadap Kekuatan Tarik pada PALF/PP Composite Moch. W Arif Sektiono; Saiful Arif; Jundan Hawariyyun; Rima Zidni Karimatan Nisak
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

This study investigates the influence of a very low mass fraction of pineapple leaf fibers (PALF) (≤ 5 wt%) on the mechanical properties of polypropylene (PP)-based composites. The PALF fibers fill the PP matrix and thus influence the mechanical properties of the composite. To improve fiber-matrix adhesion, the PALF fibers were first pretreated for 2 hours in a 5% NaOH solution. The composites were produced using a hand lay-up process, in which the PALF fibers were placed in the mold, and the PP matrix was subsequently injection-molded into the mold at 200 °C. The mass ratios of PALF to PP were 0%:100%, 1%:99%, 2%:98%, 3%:97%, 4%:96%, and 5%:95%. The mechanical properties were tested using a tensile test on a dumbbell-shaped specimen and determined according to DIN EN ISO 527-4 to establish the tensile strength (TS) and tensile modulus (TM). The results showed that adding up to 5 wt% PALF increased tensile strength by 94.74% and tensile modulus by 181.97% compared to pure, fiber-free PP. The highest values for tensile strength (32.31 MPa) and tensile modulus (17.2 × 10⁻⁴ GPa) were achieved with a 5% PALF composition. These results indicate that even small fiber content effectively improves the mechanical properties of composite materials and makes them suitable for the production of lightweight and flexible materials such as biomechanical and prosthetic components
Uji Keandalan Algoritma YOLOv11 Untuk Mendeteksi Rambu Lalu Lintas pada Berbagai Skenario Pencahayaan Yuniarto Agus Winoko; Muhammad Izzul Haqqi
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

Failure to identify traffic signs triggers road accidents, demanding autonomous vehicle navigation systems robust against lighting dynamics. Addressing the lack of objective measurements in previous studies, this research aims to design and evaluate a YOLOv11-based detection system on a miniature autonomous car prototype. The methodology includes hardware design (ESP32, webcam, actuators) and model training using 12,455 augmented images. Performance was evaluated quantitatively via real-time testing under controlled lighting (1–300 Lux) using a lux meter, then analyzed with third-order polynomial regression to prove non-linear correlations. Computationally, the model achieved an mAP@0.5 of 99.43%. Field testing demonstrated high robustness at 1 Lux confidence score (0.77), peaking at 50 Lux (0.87), but dropping drastically at 300 Lux (0.03) due to lens glare. Conclusively, YOLOv11 is highly reliable in normal lighting, but its implementation requires Lateral Overflow Integration Capacitor (LOFIC) optical sensors to overcome extreme overexposure.
Evaluasi Kinerja Sistem IoT untuk Monitoring pH dan Kontrol Suhu Air pada Akuarium Benih Ikan Clarias gariepinus Ellys Kumala Pramartaningthyas; Mohamad Hariyadi; Nur Afiyat; Siti Ma’shumah; Didik Sigiono
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

The cultivation of Clarias gariepinus requires optimal water quality management, particularly temperature and pH, to support the growth and survival of fry. Conventional manual monitoring methods are limited in terms of continuous observation and rapid response to changes in water quality. This study aimed to develop an Internet of Things (IoT)-based water temperature and pH monitoring and control system capable of real-time and integrated operation. The proposed system was developed using an Arduino UNO, NodeMCU ESP8266, a DS18B20 temperature sensor, a pH sensor, and the Blynk platform, employing a threshold-based automatic control mechanism. Water temperature was regulated using a heating element and a Peltier module. System performance was evaluated through 20 experimental trials conducted in a Clarias gariepinus fry aquarium under varying initial temperature and pH conditions outside the optimal cultivation range to assess the system's monitoring, control, and real-time data transmission capabilities. The experimental results demonstrated that the proposed system successfully maintained the water temperature at 26 °C and the pH at 6, which are within the recommended aquaculture standards. The temperature and pH sensors achieved accuracies of ±0.4% and ±0.5%, respectively, while the average communication delay was 13.59 ms, indicating fast and stable data transmission. Compared with conventional manual monitoring, the proposed IoT-based system provides continuous real-time monitoring, faster response, and automatic environmental control, thereby improving the efficiency and reliability of water quality management for Clarias gariepinus fry culture.
Integrated Design-to-Validation Framework for a Precision Dovetail Clamping Fixture in CNC Machining Applications Adam Satria; Aditya Al Fathir; Adrian Satriatama; Ahmad Rifai; Ardytya P. I. Sukardi; Hilmi Yudhistira; Maulana H. Rohman
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

Conventional vise-based workholding systems in CNC machining often limit tool accessibility, provide non-uniform clamping forces, and reduce machining stability. While dovetail clamping mechanisms have been widely investigated, studies integrating fixture design, manufacturing, experimental validation, and structural analysis into a practical and cost-effective solution remain limited. This study develops and validates a precision dovetail clamping fixture for CNC milling applications. The proposed fixture combines parametric CAD-based design, CNC manufacturing using S50C steel, experimental validation, and static structural simulation. Experimental results demonstrated dimensional accuracy within ±0.05 mm, improved workpiece accessibility, and minimal displacement during machining. Structural simulation under representative clamping and machining loads yielded a maximum von Mises stress of 188 MPa, a maximum displacement of 0.645 mm, and a minimum factor of safety of 2, indicating safe operation within the elastic range of the material. The developed fixture provides a reliable, economical, and practical alternative for precision CNC machining in small-scale industrial environments..

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