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JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY
Published by Universitas Medan Area
ISSN : 25496220     EISSN : 25496239     DOI : -
Core Subject : Science, Engineering,
Energy Industrial & Manufacturing Engineering Mechanical Engineering
This journal is a publication media of research results in the field of machinery that has been carried out by academics or practitioners by following predetermined rules. The research areas include: manufacturing, engineering materials, energy conversion and renewable energy, as well as other machinery fields, such as: mechatronics, hydraulics, plantation tools, and engine maintenance management systems. Each paper that has been sent will be reviewed by a team of experts in their field, and published online through the http://ojs.uma.ac.id/index.php/jmemme url address. This journal was founded in 2017 and has been registered with a print version of ISSN 2549-6220 and the online version of ISSN 2549-6239.
Arjuna Subject : -
Articles 226 Documents
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Decreasing the Alarm Tape Jam Ratio on the CM7 Machine Using the Fishbone Analysis Method Ridwan; Wilarso
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 10 No. 1 (2026): June 2026 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v10i1.17289

Abstract

The development of the manufacturing industry requires companies to improve the efficiency of the production process and maintain product quality stability. PT XYZ, a zipper manufacturer, faces a problem with a high Tape Jam Alarm ratio on its CM7 chain making machine, which has an impact on decreasing productivity. Based on three months of production data collection, it is known that the Tape Jam Alarm ratio reaches 8 times in every 1000 mD. This condition indicates an uncontrollable process and the need for an in-depth analysis of the causes of the disturbance. This study aims to identify the root cause of the Tape Jam Alarm and formulate corrective actions that can reduce the alarm frequency. The analysis method used is a Fishbone diagram to trace the causal factors originating from the aspects of the machine, material, method, and work environment. The results of the study indicate that the Tape Guide component on the CM7 machine has a gap that is too narrow and the surface is still rough, causing excessive friction and triggering tape jams. Based on these findings, corrective actions were taken by replacing the Tape Guide with a design that has a wider gap and a smoother surface. After the implementation of the improvements, the Tape Jam Alarm frequency was successfully reduced from 8 times to 2 times in every 1000 mD. Research on reducing tape jam alarms through modifications to the tape jam guide design on the machine is still limited. This research provides a contribution in the form of recommendations for repairing critical components on the CM7 engine and can be used as a reference in efforts to increase the efficiency and reliability of the production process at PT XYZ Keywords: Corrective actions; production; CM7
Experimental Study on the Performance of a Four-Stroke Spark-Ignition Engine Using Pertalite–Bioethanol Fuel Blends Indra Hermawan; Darianto; Saturnus Wardiman Gulo
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 10 No. 1 (2026): June 2026 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v10i1.17397

Abstract

The energy crisis and environmental impacts of fossil fuels have prompted the search for alternative fuels such as bioethanol. This study analyzes the performance of a 4-stroke gasoline engine using pure Pertalite (100%) and bioethanol blends (25% and 35%) through experimental testing with a dynamometer. The evaluated parameters include power, torque, and specific fuel consumption (SFC). The results show that pure Pertalite delivers the best performance, with a maximum power of 8.00 kW and peak torque of 10.30 Nm within the 3000–6000 rpm range. The 25% bioethanol blend produced higher power (7.30 kW) compared to the 35% blend (7.10 kW) at higher speeds (7000–9000 rpm), although both remain below Pertalite. Pertalite also exhibited the most efficient SFC (522.84–697.13 g/kWh), followed by 25% bioethanol (808.05–1371.80 g/kWh) and 35% bioethanol (2160.00–5760.00 g/kWh), particularly at lower engine speeds. Increasing the bioethanol content beyond 25% significantly reduced engine performance due to its lower energy content and suboptimal combustion characteristics. Nevertheless, a 25% bioethanol blend may be considered an environmentally friendly alternative with acceptable efficiency trade-offs. These findings highlight the importance of optimizing bioethanol composition to balance engine performance and sustainability, as well as the need for further research on emissions and material durability.
Design and Construction of Plastic Chair Armrest Cover Piercing Dies at PT. XYZ Wilarso; Asep Dharmanto; Giardyan Komara; Asep Saepudin; Mujiarto
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 10 No. 1 (2026): June 2026 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v10i1.17412

Abstract

The armrest cover on the chair is produced using the vacuum forming method and so far the line cutting and hole making process is done manually using a hand grinder, thus potentially causing quality inconsistencies and low productivity. The armrest cover made of ABS plastic has a hole dimension of 37 mm × 22 mm, a thickness of 3 mm, and a circumference of 119.27 mm, with a shear strength value of 67 MPa based on Proto XYZ data. Calculations show that the minimum force required for the punching process is 8.46 tons. This study aims to design and manufacture piercing dies for the armrest cover punching process to obtain precise cutting results and increase production output. The dies were made using a CNC milling machine with the help of Autodesk Fusion 360 software, then the dies were tested using a 15-ton capacity press machine. The test results showed that the resulting holes met the specified dimensional standards. The implementation of these piercing dies significantly increased production capacity, from 90 sets per shift in the manual process to 1,920 sets per shift using piercing dies. Thus, the use of piercing dies has proven effective in increasing the precision and efficiency of the plastic armrest cover manufacturing process.
Preliminary Study of Mechanical Properties of Fiberglass Reinforced Plastic Composites as Materials for Environmentally Friendly Remote Control Lifebuoy Dwisetiono Dwisetiono; Urip Prayogi; Frengki Mohamad Felayati
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 10 No. 1 (2026): June 2026 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v10i1.17418

Abstract

Safety in waters, whether at sea, in lakes, rivers, or other bodies of water, is crucial. A practical rescue effort is to use a lifebuoy. This research is a preliminary study of Fiberglass Reinforced Plastic (FRP) lifebuoys, which could be an option for remote-controlled, air-pollution-free, electric-powered lifebuoys. The study aimed to obtain data on the mechanical properties of FRP materials with varying numbers of reinforcing layers. Material testing was conducted to determine tensile strength, bending strength, impact strength, and hardness. The results of the study showed that the addition of reinforcing layers to the Fiberglass Reinforced Plastic (FRP) material planned for this remote control lifebuoy material also increased its mechanical properties, namely tensile strength increased by about 20% per layer, bending strength increased by about 15% per layer, shear strength increased by about 28% per layer, and the impact energy absorbed increased by about 50% per additional layer. Meanwhile, the hardness number was not affected by the addition of the number of reinforcing layers.
Experimental Study of the Effect of Water Pressure Variations and Number of Nozzles on Pelton Turbine Power and Efficiency in a Laboratory-Scale Micro Hydropower System Medyawanti Pane
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 10 No. 1 (2026): June 2026 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v10i1.17463

Abstract

Micro-Hydropower (MHP) is a renewable energy source that can be utilized to generate electricity on a small scale. This study aims to analyze the effect of water pressure variations on the performance of a laboratory-scale Pelton turbine and compare the performance of a single-nozzle and a double-nozzle system. The research method used was an experimental method with pressure variations of 2, 2.5, and 3 kg/cm² and electrical loads of 5–25 watts. Observed parameters included turbine rotation, voltage, current, output power, and system efficiency. Test results showed that increasing water pressure increased turbine output power and efficiency in both nozzle configurations. In the single-nozzle configuration, the maximum output power reached 15.19 W with a peak efficiency of 9.8% at a pressure of 3 kg/cm². Meanwhile, in the double-nozzle configuration, the maximum output power was 11.12 W with an efficiency of 7.2% at the same pressure. In general, the single-nozzle configuration performed better than the double-nozzle configuration in a laboratory-scale Pelton turbine system due to a more optimal water jet distribution and lower hydraulic losses.
Development of Wave Energy Conversion Technologies in Sumatera Utara Rakhmad Arief Siregar; Muhammad Yusuf Rahmansyah Siahaan
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 10 No. 1 (2026): June 2026 Edition
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v10i1.17637

Abstract

The increasing energy demand and the serious impact of fossil fuel use on the energy crisis and climate change encourage the development of more sustainable renewable energy sources. This study aims to design a wave conversion device as an alternative energy source for the future. A quantitative approach was used through the distribution of structured questionnaires to 35 respondents, with 29 data points declared valid for analysis. The study focused on user attitudes, knowledge, and behavior towards the device design. Preference data were processed using morphology tables and decision matrices to obtain the most appropriate design. The results showed that respondents tended to choose a pendulum operating system, a horizontal device position, and an aluminum frame, with an expected price below IDR 10 million and preventive maintenance every six months. Based on the evaluation, Concept A was selected as the best design because it was considered technically superior, easy to maintain, cost-effective, and suitable for field conditions. This design was then visualized using CAD software to support the prototyping process. This study shows that the design of a marine energy device that considers user needs and preferences can produce a more realistic, affordable solution and has the potential to strengthen the implementation of marine energy in the transition agenda towards sustainable clean energy. The resulting design offers the development of marine energy technology that is applicable and relevant to the needs of coastal communities.

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