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INDONESIA
JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN
Published by Universitas Negeri Yogyakarta
ISSN : 25487590     EISSN : 25487590     DOI : -
Core Subject : Education, Social, Engineering,
Education Mechanical Engineering Social Sciences
Jurnal Dinamika Vokasional Teknik Mesin (JDVTM) is published by the Department of Mechanical Engineering Education, Faculty of Engineering, State University of Yogyakarta. The journal is published twice a year in April and October. Each publication contains articles comprising high quality theoretical and empirical original research papers, review papers, and literature reviews. The scope of study of this journal includes mechanical engineering education, technology and vocational education, learning and curriculum development, learning method development, and learning media. All of the fields study, particularly in mechanical engineering vocational and education. The articles submitted should be attended to the particular topics above.
Arjuna Subject : -
Articles 195 Documents
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AN ANALYSIS OF DIFFERENCES IN LEARNING OUTCOMES OF MANUFACTURING TECHNICAL DRAWING IN VOCATIONAL HIGH SCHOOLS IN SLEMAN REGENCY suri, hesty monica; Ayuni Lestari; Insan Kamil
Jurnal Dinamika Vokasional Teknik Mesin Vol. 10 No. 1 (2025)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v10i1.89415

Abstract

This study aims to analyze the differences in learning outcomes of Manufacturing Technical Drawing among vocational high schools (SMK) in Sleman Regency, as well as to compare the specific achievements of public vocational schools (SMK Negeri).The study employed a quantitative descriptive method, involving 142 twelfth-grade students from the Mechanical Engineering program across five vocational schools: SMKN 1 Seyegan, SMKN 2 Depok, SMK Muhammadiyah Prambanan, SMK Nasional Berbah, and SMK Piri Sleman. Data were collected through a learning outcome test that assessed conceptual understanding, drawing skills, and proficiency in using design software. The results revealed significant differences in students' learning outcomes among the schools. SMKN 2 Depok achieved the highest average score (74.35), while SMK Piri Sleman recorded the lowest (65.29). A focused analysis of public vocational schools indicated that both SMKN 1 Seyegan (72.85) and SMKN 2 Depok (74.35) demonstrated high achievement levels, with a relatively small gap between their scores. Several factors contributed to these differences, including teacher competence, availability of facilities, teaching strategies, and student motivation. These findings are expected to provide valuable insights for schools to enhance the quality of teaching and learning.
CHARACTERISTICS OF HARDNESS AND MICROSTRUCTURE OF RECYCLED PISTONS MANUFACTURED BY SAND CASTING PROCESS Priyambodo, Bambang Hari; Handoko; Felixtianus Eko Wismo Winarto; Amida Tri Andani; Martinus Heru Palmiyanto; Kaleb Priyanto
Jurnal Dinamika Vokasional Teknik Mesin Vol. 10 No. 2 (2025)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v10i2.86156

Abstract

Motorcycle piston waste, made from aluminum, is often poorly managed despite its advantages in corrosion resistance and thermal conductivity. This study aims to enhance the economic value of piston waste through recycling using the sand casting method. The melting process was conducted at a temperature of 843°C, followed by casting into sand molds. The recycled product is intended for use as a ship propeller component. Tests performed included Vickers hardness testing and microstructural analysis to evaluate the mechanical properties and material characteristics. The results showed that the recycled material exhibited an average hardness of 77.2 kg/mm², consistent with standard aluminum hardness. Microstructural analysis revealed the presence of porosity which may affect mechanical strength; however, this porosity did not reduce the material's resistance to mechanical damage and provided good toughness. Based on these findings, it can be concluded that motorcycle piston waste recycled by sand casting at 843 °C has potential for use in manufacturing high-value components such as ship propellers, considering the hardness quality and microstructural characteristics of the material.
PRESCRIPTIVE MAINTENANCE OF KOMATSU DUMP TRUCK HD785-7 USING NAÏVE BAYES CLASSIFIER UNDER FULL MAINTENANCE CONTRACT Paimin; Baskoro, Gembong; Sahputra, Iwan
Jurnal Dinamika Vokasional Teknik Mesin Vol. 10 No. 2 (2025)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v10i2.89737

Abstract

This study proposes a Prescriptive Maintenance (RxM) framework aimed at improving the Physical Availability (PA) of Komatsu Dump Trucks HD785-7 operated under a Full Maintenance Contract (FMC) at PT ABC Site Sangkulirang. The research integrates the DMAIC methodology with the Knowledge Discovery in Databases (KDD) process to systematically analyze operational failures. Historical breakdown data were preprocessed and modeled using a Naïve Bayes (NB) classifier, selected for its robustness in handling categorical features common in maintenance records. The model demonstrated high predictive performance with 97.93% accuracy, 100% precision, 94.12% recall, and an AUC of 0.995, indicating strong reliability in distinguishing high-risk conditions. The RxM framework was embedded into daily maintenance planning and Standard Operating Procedures (SOPs), supported by a monitoring dashboard for continuous feedback and retraining. As a result, the proportion of Breakdown Unscheduled (BUS) events decreased from 45% in 2024 to 26% in mid-2025, while fleet PA consistently exceeded the contractual target of 92%, reaching 95.5%. These findings confirm that embedding prescriptive analytics into maintenance workflows not only reduces unplanned downtime but also enhances resource allocation and decision-making. The case study highlights the practical value of combining statistical learning with structured process improvement to drive digital transformation in mining operations.
EMPLOYMENT 5.0: THE RELATIONSHIP BETWEEN STUDENTS' PERCEPTION OF WELDING TECHNOLOGY COURSES AND THE WORK READINESS Januariyansah, Sapitri; Yulanto, Dwiki Muda; Siregar, Batumahadi; Situmorang, Hasianna Nopina; Gunawan, Safri; Doni, Rahma
Jurnal Dinamika Vokasional Teknik Mesin Vol. 10 No. 2 (2025)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v10i2.92101

Abstract

Work readiness is an important factor in overcoming the high unemployment rate of college graduates. Various efforts have been made to improve the quality of work readiness, such as through welding technology courses. However, practical contributions measured through statistical analysis have never been made to date. The purpose of this study is to analyze the relationship between students' perceptions of welding technology courses and work readiness. This type of research was ex-post facto research with a quantitative approach. The data collection technique used a questionnaire technique. The data analysis technique used correlational inferential analysis. The results of the study indicate that students' perceptions of welding technology courses (X) have a relationship with work readiness (Y) in the moderate category (r = 0.577) with the amount of contribution based on the coefficient of determination (r2 = 0.333) which means that variable X contributes 33.3% to Y. Based on the regression coefficient (b = 0.228) which shows that if variable X increases by 1 unit then variable Y increases by 0.228. The implications of this study indicate that welding technology courses make a moderate contribution to improving work readiness
DETERMINING THE JOB READINESS OF VOCATIONAL GRADUATES IN THE INDUSTRIAL REVOLUTION 4.0 ERA: PERSPECTIVES ACADEMICS & PRACTITIONERS Indra, Muhammad; Pardjono, Pardjono; Rahdiyanta, Dwi; Triyono, Mochamad Bruri; Herdianto, Yogi; Saputra, Romy
Jurnal Dinamika Vokasional Teknik Mesin Vol. 10 No. 2 (2025)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v10i2.90556

Abstract

The work readiness of vocational graduates is crucial for realizing Independent Learning and Independent Campus (MBKM (acronyms in Bahasa)). However, there are pros and cons from various parties and issues regarding the lack of readiness (competence) of vocational graduates in the 4.0 era, and few discussions about the relationship between this and MBKM. Therefore, this article aims to analyze the best practices in MBKM for the work readiness of vocational graduates in the era of the 4.0 industrial revolution by applying a quantitative survey method. The results of the study reveal that character is the dominant factor for vocational work readiness in the era of the 4.0 industrial revolution, followed by technical and non-technical competencies, with the conclusion that character and its sub-aspects, such as honesty, discipline, responsibility, hard work, a creative attitude (open to new ideas), and curiosity, are fundamental to supporting the future of vocational graduates who are able to compete globally
DEVELOPMENT OF LUBRICATION SYSTEM LEARNING MEDIA BASED ON THE INSTAGRAM APPLICATION Jabariel, Evan Novrian; Sukrawan, Yusep; Mubarak, Ibnu
Jurnal Dinamika Vokasional Teknik Mesin Vol. 10 No. 2 (2025)
Publisher : Department of Mechanical Engineering Education

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

Abstract

Instructional media serves as a pivotal tool in facilitating interactions between teachers and students. The effective and efficient learning process can be significantly enhanced through the optimal utilization of these media. However, this ideal has not been fully realized in the learning environment of SMK Negeri 7 Baleendah. To address this gap, this study aimed to develop an optimal instructional medium. The 4-D model was employed as the methodological framework for this research. The developed instructional medium underwent rigorous validation by a panel of five media experts and five material experts. Upon successful validation, the medium was disseminated to students for practical application. The results of the study revealed that the developed medium demonstrated high validity, as assessed using the Content Validity Ratio (CVR) and Content Validity Index (CVI). The CVR analysis of the media experts' ratings yielded a perfect score of 1 for all items, indicating strong content validity. Similarly, the CVI analysis produced a score of 1, further confirming the medium's content validity. The material experts' ratings also exhibited high validity, with CVR scores consistently exceeding 0.50 and CVI scores surpassing 0.83. Subsequent dissemination of the medium garnered positive feedback from the student users. The learning media that has been created can be used by teachers and students.
CLEAN WATER AND DIRTY WATER PLUMBING PLANNING AT DELIVERY CENTER POS MEDAN OFFICE Ali; Aldianto, M.; Davin, M.; N, Fadhil
Jurnal Dinamika Vokasional Teknik Mesin Vol. 10 No. 2 (2025)
Publisher : Department of Mechanical Engineering Education

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

Abstract

The construction of multi-story buildings requires comprehensive sanitation planning, including the design of clean water supply and wastewater drainage systems. Plumbing system planning aims to ensure that the supply of clean water and the disposal of wastewater are managed effectively and in accordance with technical standards. This study aims to analyze the clean water and wastewater plumbing installation requirements for the Pos Medan Delivery Center Office Building. The planning is based on the Indonesian National Standard 03-7065-2005, which outlines the procedures for plumbing system design. The clean water source is provided by deep well, which supplies water that is pumped into a rooftop storage tank. From there, water is distributed to each plumbing fixture using a gravity-fed system. Based on the planning calculations, the daily water demand for 77 employees is 4.62 m³/day. The estimated volume of blackwater (wastewater) generated is 3.12 m³/day, while the volume of greywater is 1.68 m³/day. The clean water piping system utilizes Polyvinyl Chloride pipes with the following dimensions ½ inch for individual plumbing fixtures, ¾ inch for distribution to 2–3 fixtures, 1 inch for distribution to 3–4 fixtures, 1¼ inch for distribution to 4–5 fixtures, 1½ inch for vertical risers and distribution to 5 or more fixtures. For the greywater and blackwater piping system, PVC pipes are also used with the following dimensions 1½ inch for discharge from washbasins, 2 inch for discharge from urinals, 2½ inch for floor drain discharge, 3 inch for vertical stacks collecting greywater from floor drains, washbasins, and sinks, 4 inch for toilet discharge, 6 inch for the main discharge line carrying blackwater from urinals and toilets to the bioseptic tank. This plumbing system design ensures an efficient and standardized distribution and disposal network, supporting the overall functionality and hygiene of the building.
THERMAL AND ENERGY ANALYSIS OF AN ICE-MAKING MACHINE USING AN OUTDOOR AC REFRIGERATION SYSTEM Teguh Setyawan, Reinaldi; Kurniawan, Irwan; Umira, Siti
Jurnal Dinamika Vokasional Teknik Mesin Vol. 10 No. 2 (2025)
Publisher : Department of Mechanical Engineering Education

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

Abstract

This study investigates the thermal and energy performance of a custom designed ice maker that utilizes a modified outdoor air conditioning (AC) unit as its primary refrigeration system. The objective is to evaluate the feasibility, efficiency, and operational stability of using a household AC condenser unit for small scale ice production, particularly in areas with limited access to commercial ice making equipment. The experimental setup was tested over an 8 hour operation period, with parameters such as input water temperature, ice formation temperature, freezing time, power consumption, Coefficient of Performance (COP), and system efficiency being measured and analyzed. The results show that the system was capable of producing 6.5 kg of ice, with a measured actual COP of 3.05 and an efficiency of 67.78%. Although minor deviations were observed from the design specifications, the overall performance remained within acceptable limits. These findings suggest that repurposing outdoor AC units can provide a cost effective and energy efficient alternative for localized ice production.
DEVELOPMENT OF APPLIED MECHANICAL ENGINEERING UNDERGRADUATE CURRICULUM BASED ON INDUSTRY NEEDS Wibowo, Heri; Kusdiyarto, Prihatno; B, Muh Imawan; Fakhri, Ardani Ahsanul
Jurnal Dinamika Vokasional Teknik Mesin Vol. 10 No. 2 (2025)
Publisher : Department of Mechanical Engineering Education

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Abstract

The curriculum currently used in many universities is still not fully aligned with industry needs, causing a gap between graduate competencies and workplace expectations. Many graduates experience difficulties in finding employment because their skills do not match industry demands. To overcome this problem, the development of an industry-based curriculum is a strategic solution involving various stakeholders such as industry, academics, and alumni.  This study used the Research and Development (R&D) method with the Borg & Gall development model, which includes 10 stages. The results show that the new curriculum for the Mechanical Engineering Applied Bachelor Program emphasizes a greater proportion of practice (60%) compared to theory (40%). This new curriculum is designed to be more relevant to industry needs, integrating the latest technology. Trials of the new curriculum show a 12% increase in students' practical competencies, while the industry partner satisfaction rate reaches 88%, indicating the effectiveness of the new curriculum product.
ANALYSIS OF TORQUE ROD BUSHING DAMAGE IN HINO 500 DUMP TRUCK UNITS AT PT XYZ Ramadhan, Arief Pambudi; Setiawan, Widia; Krisnaputra, Radhian; Hendaryanto, Ignatius Aris; Priyambodo, Bambang Hari
Jurnal Dinamika Vokasional Teknik Mesin Vol. 10 No. 2 (2025)
Publisher : Department of Mechanical Engineering Education

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Abstract

Bushing torque rod is a critical component of the suspension system in heavy-duty vehicles, functioning to absorb vibrations and maintain axle stability. In practice, repeated failures of this component have been observed in dump truck units operating with high hour meters, leading to reduced vehicle stability, driver discomfort, and increased downtime for maintenance. This study aims to analyze the relationship between operational hours and the severity of torque rod bushing damage, as well as to identify the most vulnerable positions in Hino 500 dump trucks at PT XYZ. The research applied a quantitative approach using descriptive statistics, Pearson correlation, and simple linear regression. Data were collected from 50 dump truck units, covering six bushing positions: Front Upper, Rear Upper, Front Left, Front Right, Rear Left, and Rear Right. The results showed that Rear Left and Rear Right bushings had the highest frequency of severe damage, each at 70%, followed by Front Left (50%) and Front Right (44%), while Front Upper and Rear Upper recorded the lowest rates. Regression analysis revealed a strong positive correlation between operational hours and damage severity. The developed model predicts that for every 1,000 additional hours of operation, the potential for bushing failure increases by a quantifiable measure. Consequently, a preventive replacement strategy is recommended at 6,000–7,000 operational hours, particularly for the rear axle positions, to mitigate downtime

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