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Jurnal Pendidikan Teknik Mesin Undiksha
Published by Universitas Pendidikan Ganesha
ISSN : 26141876     EISSN : 26141884     DOI : http://dx.doi.org/10.23887/jjtm.v7i1.18616
Core Subject : Education, Engineering,
Automotive Engineering Education Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Jurnal Pendidikan Teknik Mesin, adalah jurnal ilmiah yang diterbitkan oleh Jurusan Pendidikan Teknik Mesin, Fakultas Teknik dan Kejuruan, Universitas Pendidikan Ganesha. Jurnal ini bertujuan untuk mewadahi artikel-artikel hasil penelitian dan hasil pengabdian masyarakat dibidang pendidikan dan pembelajaran teknik. Pada akhirnya Jurnal ini dapat memberikan deskripsi tentang perkembangan ilmu pengetahuan dan teknologi di bidang pendidikan teknik mesin bagi masyarakat akademik. Jurnal ini terbit 3 kali setahun.
Arjuna Subject : Umum - Umum
Articles 296 Documents
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Analisis Pengaruh Variasi Panjang Header Knalpot terhadap Performa Motor Manual 100cc dengan Metode Kruskal-Wallis: Analysis of the Effect of Exhaust Header Length Variations on the Performance of a 100cc Manual Motorcycle with Kruskal-Wallis Method Jhony Langgeng Baruna Wirawan; I Wayan Purnayasa
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study investigates the effect of varying exhaust header length on the engine performance of a 100cc manual motorcycle using a non-parametric statistical approach. Three header lengths (30 cm, 45 cm, and 60 cm) were evaluated. Performance indicators assessed included torque, power (horsepower), and specific fuel consumption (SFC), measured at five engine speed settings: 3000, 3500, 4000, 4500, and 5000 rpm. Torque and power measurements were performed using a dynamometer (dynotest), while fuel consumption was recorded using a flowmeter. For data analysis, the Kruskal–Wallis test was applied, as preliminary Shapiro–Wilk and Levene tests indicated that the dataset did not meet the assumption of normality. Statistical results indicate that exhaust header length has a significant effect on torque and fuel consumption at all tested rpm levels. Power output also exhibits significant variation, especially at medium to high engine speeds. Among the configurations tested, the 45 cm header consistently delivered the best overall performance, producing the highest torque and power while achieving the most efficient fuel consumption. These findings highlight the critical role of optimal exhaust header design in maximizing the efficiency and performance of small-displacement motorcycle engines.
Pengaruh Metode Fabrikasi terhadap Kekuatan Tarik Komposit Serat Cordyline Australis: The Effect Of Fabrication Method On The Tensile Strength Of Cordyline Australis Fiber Composites Ida Bagus Putu Purwadnyana; Tjokorda Gde Tirta Nindhia
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v13i2.102758

Abstract

This study aims to investigate the effect of fabrication methods on the tensile strength of epoxy composites reinforced with untreated Cordyline australis fibers. Two fabrication methods were compared: closed hand lay-up and vacuum chamber. The fiber weight fractions used were 1%, 2%, and 5%. Tensile tests were conducted according to ASTM D638, and morphological characteristics were examined through surface and fracture micrograph analysis. The results show that the hand lay-up method consistently produced higher tensile strength compared to the vacuum method across all fiber fractions. The highest tensile strength was achieved at 2% fiber fraction using the hand lay-up method, reaching 26.91 MPa, while the vacuum method only reached 21.11 MPa. At 5% fiber content, the vacuum method experienced a significant drop in tensile strength to 12.34 MPa, indicating its ineffectiveness at higher fiber loadings without treatment. Micrographic analysis revealed that the vacuum method tended to produce voids and resin-poor areas around the fibers. These findings confirm that fabrication method has a significant influence on the mechanical performance of the composite, and that the hand lay-up method is more suitable for natural fiber-based composites without additional treatments.
Analisis Tingkat Kelulusan Welder Qualification Test Berdasarkan AWS D1.1/D1.1M:2020: Analysis of Pass Rates for the Welder Qualification Test Based on AWS D1.1/D1.1M:2020 Adhe Aryswan; Rio Rahmad Guntur; Ari Wibowo; Nurman Pamungkas
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 14 No. 2 (2026)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v14i2.76264

Abstract

The welder qualification process is pivotal to ensuring quality welding in fabrication industries. This study presents the outcomes of a welder qualification test conducted from February 16 to 17, 2023, involving 151 participants across seven batches. Utilizing the AWS D1.1/D1.1M:2020 standard, participants underwent visual inspection to assess welding proficiency. Results revealed that 141 welders successfully met qualification criteria, while 10 encountered failures primarily due to fast travel speeds and high ampere settings leading to visible defects. The qualification process showcased a 90% success rate on the first day and 100% success on the second day. Grades A, B, and C were employed to assess visual inspection outcomes, with most participants achieving grades A and B. Overall, the study emphasizes the importance of meticulous adherence to welding parameters and procedures to ensure successful qualification outcomes. Addressing identified areas of improvement, particularly regarding welding parameters, is crucial for enhancing the effectiveness of future qualification processes and nurturing a skilled workforce in alignment with industry standards.
Analisis Pengaruh Berat Loler Sliding Terhadap Torsi, Daya Dan Kosumsi Bahan Bakar Pada Motor Metic CVT: Sliding Roller Weight Variations on Torque, Power, and Consumption of CVT Motorcycles Kadek Ari Setiawan; Ni Made Novia Kusumayani; Nyoman Arya Wigraha
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 14 No. 2 (2026)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v14i2.102514

Abstract

This study aims to analyze the effect of sliding roller weight variations on torque, power output, and fuel consumption in automatic motorcycles equipped with a CVT (Continuously Variable Transmission) system. The research object is a 2013 Honda Vario 110cc FI motorcycle. The rollers used include a standard cylindrical roller weighing 13 grams, and sliding rollers with weights of 10 grams, 12 grams, and 15 grams, respectively. The research method employed is experimental, with data collected through dynotest measurements for torque and power, as well as fuel consumption testing within an engine speed range of 3000 – 7000 rpm, with data recorded at five specific points: 3000 rpm, 4000 rpm, 5000 rpm, 6000 rpm, and 7000 rpm. The results indicate that variations in sliding roller weight affect engine torque and power. In general, all sliding roller variations tested produced higher torque and power compared to the standard roller. Torque testing revealed that increasing the weight of the sliding roller tends to enhance torque at lower engine speeds. The 15-gram sliding roller produced the highest average torque of 20.28 N.m at 3000 rpm, while the 10-gram and 12-gram rollers produced average torque values of 19.82 N.m and 19.81 N.m, respectively. Power testing showed that lighter sliding rollers tend to generate greater power at medium engine speeds. The 10-gram roller yielded the highest average power output of 9.08 HP at 5000 rpm, followed by the 12-gram (8.94 HP) and 15-gram (7.96 HP) rollers. Meanwhile, fuel consumption testing showed that all roller variations exhibited nearly identical consumption patterns at each engine speed, with an average difference of less than 0.015%. Keywords: CVT, sliding roller, torque, power output, fuel consumption, automatic motorcycle
Deskripsi Konsep Diri Mahasiswa Pendidikan Teknik Otomotif Terhadap Profesi Guru : Description of the self-Concept of Automotive Engineering Education Students Toward the Teaching Profession Andhika Rafli Syafikri; Fardhan Azhar; Wahid Munawar
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 14 No. 2 (2026)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v14i2.114673

Abstract

This study aims to describe the self-concept of student in the Automotive Engineering Education program at Universitas Pendidikan Indonesia toward the teaching profession. The method used is a descriptive quantitative approach involving 32 respondents selected through convenience sampling. Data were collected using a Likert-scale questionnaire. The result indicate that the aspect of students’ perceptions of the teaching profession achieved the highest percentage at 78.58% (good category), followed by perceived teaching ability at 64.26% and self-confidence at 63.61%, while interest in the teaching profession showed the lowest percentage at 51.74% (fair category). Overall, the students’ self-concept toward the teaching profession has not yet been fully and comprehensively developed
Pengaruh Variasi Kuat Arus Listrik Terhadap Kekuatan Tarik Hasil Pengelasan Tungsten Inert Gas (TIG) Pada Material Aluminium 5052: 1. PENDAHULUAN, 2. METODE, 3. HASIL DAN PEMBAHASAN, 4. KESIMPULAN DAN SARAN, UCAPAN TERIMAKASIH, DAFTAR RUJUKAN Abdi Ciputra; Ni Made Novia Kusumayani; Edi Elisa
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 14 No. 2 (2026)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v14i2.115053

Abstract

Technological advances in the field of welding continue to develop, especially in the Tungsten Inert Gas (TIG) method which is widely used to join metals such as Aluminum 5052. This study was conducted to examine the effect of differences in electric current on the mechanical properties of welding results, including tensile strength, strain, and modulus of elasticity, using ER4043 electrodes and CO₂ shielding gas and ASTM E8 standard specimens. The approach used was a quantitative experiment with variations in current of 90A, 100A, 110A, and 120A, then tested using a tensile testing machine and analyzed through data presentation in the form of tables and graphs. The test results showed that a current of 100A provided the highest tensile strength value of 79.242 MPa, while a current of 120A produced the largest strain of 0,0174 which indicates a more ductile material. Meanwhile, the highest modulus of elasticity value was obtained at a current of 100A of 20,614 GPa which indicates the best level of material stiffness. In general, current variations significantly affect the mechanical characteristics of the weld, with currents that are too low resulting in less than optimal penetration, while currents that are too high can potentially cause overheating and weld defects. Therefore, determining the appropriate current is a crucial factor in achieving optimal weld joint quality.

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