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Jurnal Pendidikan Teknik Mesin
Published by Universitas Negeri Semarang
ISSN : -     EISSN : 25031759     DOI : https://doi.org/10.15294/jptm
Core Subject : Engineering,
Mechanical Engineering
First published in June 2001 and since then it is published biannually in June and December. Contains articles lifted from the results of research on field mechanical engineering and the idea of thinking (conceptual) for the development of education and teaching in the field of Mechanical Engineering, in particular at the Institute of Education Personnel (LPTK) and Vocational High School (SMK). The journal is also a means of communication between professors, teachers, instructors, practitioners in business / industry, as well as other related institutions.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 30 Documents
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Application of MULTIMEDIA Powerpoint Assisted Learning to Improve Learning Outcomes of Knowledge of the function of Fracture Machine Parts Prastiyo pras; Muhammad Khumaedi; Kriswanto
Jurnal Pendidikan Teknik Mesin Vol. 25 No. 02 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v25i02.28845

Abstract

The purpose of the research conducted to determine the effect of using PowerPoint multimedia on improving student learning outcomes in the subject of milling machine parts at SMK IPT Karangpanas. The background of this research is based on poor student learning outcomes, which are below the Graduation Threshold Value (KKM). Before conducting research, the feasibility of media and material was tested by experts with a percentage of 83% so that the material and media were suitable for use. The method used is quantitative experimental research with a two-group pre-test and post-test experimental model. Samples from two XI classes were taken randomly, with one experimental class and the other as a control class. Data were collected through questions in the form of pretest and posttest, and analysed using normality test, paired sample t-test, independent sample t-test, and N-Gain analysis. Results showed a significant improvement in learning outcomes in the experimental class compared to the control class, with a higher mean posttest score. The independent sample t-test showed significance <0.001, and the mean N-Gain of 0.4713 was classified as moderate. Thus, the use of PowerPoint multimedia was proven effective in improving students' learning outcomes.
ANALYSIS OF MECHANICAL CHARACTERISTICS OF TOOTH BUCKET EXCAVATOR BASED ON DIFFERENT GRADE LEVELS akhmad nurdin; Iqbal Zulfikar Alief Utama; Bagus Angger Prasetiyo; Rosyidi Hidayat; Fajar Paundra; Fajri Kurniawan; Dzikrina Salsabila Yasmin; Abdul Muhyi
Jurnal Pendidikan Teknik Mesin Vol. 25 No. 02 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v25i02.33074

Abstract

The purpose of this study is to comprehend the microstructure and hardness value of three distinct tooth bucket manufacturers. Three manufacturers' excavator tooth buckets—Canada Grade, China Grade A, and China Grade C—are compared for their mechanical characteristics. Among the tests are the Vickers method for measuring hardness, optical microscopy for examining microstructure, and chemical composition analysis. According to the results, the primary elements in all three specimens—carbon, silicon, manganese, and chromium—meet the DIN Grade 25CrMo4 standard. The martensite phase, which gives the Canada product its hardness and resistance to deformation, dominates its microstructure. The China Grade C product, on the other hand, has a more prominent ferrite phase, which raises ductility while decreasing hardness. China Grade C (570.24 HVN) had the highest hardness test value, followed by China Grade A (517.67 HVN) and Canada (468.09 HVN). This demonstrates that while Canada excels at withstanding heavy loads without damage, China Grade C is better suited for applications needing high wear resistance. Users of heavy machinery can use this study as a scientific guide when choosing bucket nails based on operational requirements, including material toughness and wear.
The Effect of Fuel Injection Duration on Exaust Gas Emissions of a 4-Stroke Engine 113.68 CC Using Bioethanol Fuel Iqbal Zulfikar; Akhmad Nurdin; Angger Bagus Prasetiyo; Bambang Irawan
Jurnal Pendidikan Teknik Mesin Vol. 25 No. 02 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v25i02.33503

Abstract

In Indonesia, the number of motor vehicles using fuel as an energy source is rising quickly. The government has developed renewable energy to reduce fuel consumption because, according to the Downstream Oil and Gas Regulatory Agency (BPH Migas), the consumption of gasoline-type fuels in 2017 was 1,858,875 L/Quarter. Determining the impact of using bioethanol with different injection times on exhaust gas emissions was the aim of this study. Bioethanol is an environmentally friendly alternative fuel for cars that uses less fuel. It is a renewable energy source made from vegetable sources. Variations in fuel injection duration and exhaust gas emission are the main subjects of this study. With no modifications to compression, the engine operates under standard conditions. A gas analyzer and engine speeds of 1500, 2000, 3000, 4000, and 5000 Rpm were used in the study. According to the study's findings, the amount of CO exhaust gas dropped. At 5000 RPM for 4 ms, the lowest CO in bioethanol fuel is 1.21%. With bioethanol fuel, the amount of HC exhaust gas emissions has dropped. 710 ppm at 3000 Rpm for 4 ms is the lowest HC level. When using bioethanol as fuel, the amount of CO2 emissions rises. The maximum CO2 concentration is 6.50% at 5000 RPM for 4 ms. The maximum amount of O2 emissions from bioethanol fuel is recorded at 1500 RPM for 4 ms.
A REVIEW ON THE POTENTIAL OF INDONESIAN NATURAL FIBERS AS BALLISTIC COMPOSITE MATERIALS fajar paundra; Puji Basuki; Indah Puspitasari; Kuncoro Diharjo
Jurnal Pendidikan Teknik Mesin Vol. 25 No. 02 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v25i02.35870

Abstract

Ballistic composites are key materials in protective applications designed to absorb and dissipate the impact energy of projectiles. Currently, the reliance on synthetic materials such as aramid fibers (Kevlar) and ultra-high molecular weight polyethylene (UHMWPE) faces challenges including high production costs, environmental impact, and import dependency. Indonesia, with its abundant natural fiber resources such as ramie, abaca, bamboo, and sisal, has great potential to develop sustainable and self-reliant ballistic composite materials. This review aims to systematically examine the potential of Indonesian natural fibers as ballistic composite materials by analyzing their mechanical properties, comparing them with ballistic requirements, and identifying key challenges and development strategies. The study concludes that although natural fibers exhibit promising mechanical properties, they face major limitations such as hydrophilic nature and variability in characteristics. However, chemical treatments and surface engineering (such as reinforcement with SiO₂, CNT, or SiC) have been shown to improve fiber–matrix interfacial performance, thereby opening opportunities for the utilization of Indonesian natural fibers in effective and environmentally friendly ballistic composites.
IMPLEMENTATION OF NANO COATING CERAMICS TECHNOLOGY IN VOCATIONAL LEARNING TO IMPROVE THE CORROSION RESISTANCE OF AUTOMOTIVE COMPONENTS IN COASTAL AREAS Budiyanto; Fahmy Zuhda Bahtiar; Muhammad Rizky Rohmawan; Sena Mahendra; Wahid Bagas Wara; Yansen Capriano; Gigih Mujiyono
Jurnal Pendidikan Teknik Mesin Vol. 25 No. 02 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v25i02.37836

Abstract

Coastal flooding creates a highly corrosive environment that damages motorcycle components. This study evaluates the synergistic effects of proper repainting procedures and nano-ceramic coatings on the corrosion resistance of the main standard of motorcycles. Laboratory experiments were conducted using a post-assay-only control group design with four treatments: nanocoating, repainting, a combination of both, and untreated controls. The samples underwent accelerated corrosion testing through immersion for 15 days in a 3.5% NaCl solution. The combined treatment shows superior performance, achieving the lowest corrosion rate (0.15 mm/year), perfect adhesion (0B), and highest hardness (4H). This represents a reduction in corrosion rate of about 91% compared to control. The results significantly show that integrating a multi-layer repainting foundation (primer, surfacer, top layer) with a SiO₂-based nano-ceramic top layer creates a synergistic barrier system. This approach is recommended as a highly effective and practical solution to significantly extend the life of assets and improve operational safety in corrosion-prone areas.
DEVELOPMENT OF LEARNING MEDIA TO IMPROVE STUDENT LEARNING OUTCOMES ON PRODUCT BRANDING MATERIALS IN VOCATIONAL HIGH SCHOOLS rangga dino Alfian; Fahmy Zuhda Bahtiar; Fathur Rahman; Nurul Burhan
Jurnal Pendidikan Teknik Mesin Vol. 25 No. 02 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v25i02.37848

Abstract

The purpose of this study is to analyze the needs of teachers and students for learning media, to determine the feasibility of learning media, and to measure the effectiveness of this learning media on Shiva learning outcomes. This type of research is Research and Development (R&D). With the validation of the research instrument, it is then continued with the research procedure using 10 stages, and quantitative descriptive data analysis techniques. The results of the media feasibility test obtained a percentage of 95% for the media assessment so that the product was categorized as "very feasible", and 93% for the assessment of material experts so that the product was also categorized as "very feasible". Student learning outcomes at n-gain value get an average score of 0.8547, meaning that the increase in student learning outcomes is in the "high" category. The researcher suggested that the use of android-based learning media to improve student learning outcomes on product branding materials could be an alternative and reference for learning media.
COMPREHENSIVE REVIEW OF THE APPLICATION OF HYBRID NANOFLUIDS (HNF) IN MINIMUM QUANTITY LUBRICATION (MQL) FOR SUSTAINABLE MACHINING Nana Supriyana; Afif Faishal; Dhimas Cahyo Anindito; Kuncoro Diharjo
Jurnal Pendidikan Teknik Mesin Vol. 25 No. 02 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v25i02.40338

Abstract

Conventional cutting fluids in machining cause environmental and economic concerns. Minimum Quantity Lubrication (MQL) offers a sustainable alternative but faces cooling and lubrication limitations. Integrating hybrid nanofluids (HNF) into MQL significantly enhances machining performance. This review systematically analyzes HNF-MQL applications in continuous machining, examining improved cooling-lubrication mechanisms, performance outcomes, and sustainability. Results indicate HNF consistently outperforms single nanofluids, reducing cutting force, tool wear, and improving surface quality across various hard-to-machine materials. HNF-MQL also lowers fluid consumption, energy use, and environmental impact. However, challenges like nanoparticle stability, cost, and production scalability hinder widespread adoption. HNF-MQL presents an effective green machining strategy, with future research needed in material optimization, advanced delivery systems, and deeper mechanistic understanding.
THE DETERMINATION OF THE OUTSIDE MOLD DIMENSION FOR OPTIMIZATION OF THE CLAMPING FORCE OF THE PLASTIC INJECTION MACHINE Puji Basuki; Ratih Setyaningrum; Muhammad Bagus Laroybafih; Suwantri -
Jurnal Pendidikan Teknik Mesin Vol. 25 No. 02 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v25i02.41282

Abstract

Injection molding is a popular method that is used to make plastic products due to high productivity, efficiency, and manufacturability. This paper presents the effect of the mold outside dimension on a suitable injection molding machine. It is to capacity in relation to production cost. This research is important as a guide for determining the outer dimensions of the mold to suit the machine being used. The smallest size isn't necessarily the most efficient, as there are minimum dimensions that can be used. The research included calculations for product weight, cycle time, tie bar distance, and minimum mold height. The compatibility between the injection machine used and the mold's outer dimensions is crucial. In this research, the mold height needs to be increased from the previously designed smallest dimensions.
APPLICATION OF FLIPPED CLASSROOM AND AI BASED ON IGNASIAN PEDAGOGICAL PARADIGM IN MACHINE MODELING CLASSES Gilang Argya Dyaksa
Jurnal Pendidikan Teknik Mesin Vol. 25 No. 02 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v25i02.42905

Abstract

This research develops an innovative learning model in the machine modeling classroom using flipped classroom and generative AI methods and it is based on ignasian pedagogy. This research was held parallel in 2 classes, class B1 using the flipped classroom method and class B2 using conventional methods. This study aims to determine the significance of increasing final scores using the independent t-test in the application of flipped classroom in machine modeling classes with assessment rubrics based on the 4C components, namely competence, conscience, compassion, and commitment.  The results of the t-test showed that the final score of class B1 was higher than class B2 even though it was not statistically significant. Although statistically insignificant, qualitative observations show that increased engagement, preparedness, and conceptual mastery among students using the FC–Gen AI–IP model. This study highlights the potential of integrating Gen AI and IP into the flipped classroom framework to enrich learning experiences in CAD-based engineering courses.
EFFECT OF WOOD GRAIN ORIENTATION ON THE BENDING AND IMPACT STRENGTH OF CARBON FIBER–BALSA WOOD SANDWICH COMPOSITES WITH A POLYESTER RESIN MATRIX fajar paundra; Khodrani; Fajar Perdana Nurullah; Kardo Rajagukguk; Eko Pujiyulianto; Sena Maulana
Jurnal Pendidikan Teknik Mesin Vol. 25 No. 02 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v25i02.44886

Abstract

The orientation of wood grains significantly determines the mechanical strength of a sandwich composite material where this study aims to analyze the effect of balsa wood grain orientation variations (0°, 30°, 60°, and 90°) as a core material on flexural and impact strength. The materials used in this research consist of a balsa wood core carbon fiber skins, and a polyester resin matrix, fabricated using the vacuum bagging method. The testing procedures include the three-point bending test referring to the ASTM C393 standard, and the drop weight impact test adhering to ASTM D7136. The experimental data were analyzed to evaluate the mechanical strength and failure characteristics resulting from flexural loading and sudden impact. The results indicate that the straight grain orientation (0°) provides a maximum flexural strength of 22.77 MPa and the best impact resistance compared to other grain directions. This study confirms that balsa wood grain orientation has a significant influence on mechanical strength establishing the straight grain as the most optimal configuration for lightweight structural  applications that require weight efficiency and high mechanical performance.

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