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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 185 Documents
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DESIGN OF PLASTIC SHREDDING MACHINE WITH HSS CRUSHER TYPE Susilawati, Susilawati; Nugraha, Aditya; Buchori, Azhis Sholeh; Rachelia, Faadiyah Cheryl; Pramudia, Mochammad Resa
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 2 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i2.78306

Abstract

Human commonly use plastic because it is easy to get, economical, heat-resistant, and lightweight. PET plastic is widely used for single-use bottles. This high usage of plastic leads to the accumulation of plastic waste which is difficult to decompose and damaging the environment. The solution is to recycle plastic using an HSS crusher-type plastic shredder. The design process of the HSS crusher-type plastic crusher machine includes: the data collection process, the design starting from the design concept, design embodiment, and design details using Solidworks 2021 Software in two- and three-dimensional forms then processed for design validation. Then, the supervision of the tool manufacturing was continued to determine the suitability of the tool with the created design, machine testing, and evaluation. The dimension of this HSS crusher-type plastic shredding machine design is 775 í— 635 í— 1553 mm with a machine weight of 200 kg. The machine components consist of AS blade, US blade, side blade lock, side blade, UCP 208, size sieve, US knife holder, machine frame, output, holder, US cover, top cover, pulley cover, pulley, output cover, input, hopper, and machine wheel. The engine frame is made by using UNP 50-60 iron. The engine drive is a a 1HP electric motor. The machine made by mild steel plate material which has 10 pcs of steel blades consisting of 6 pcs of steel blades and 4 pcs of sitting blades. The product from this shredded machine is in the form of PET plastic flakes which can be recycled further.
EXPERIMENTAL STUDY ON EVALUATION OF CAVITATION AND WORKING PERFORMANCE OF MOSWELL AQUA 175 CENTRIFUGAL PUMP ON SERIES SERIES WITH DEBIT VARIATIONS Bagas, Putra; Faizin, Ahmad Khairul
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 2 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i2.77339

Abstract

Centrifugal pump is commonly used in industry. Centrifugal pumps work by converting mechanical energy into pressure and kinetic energy. In centrifugal pumps, cavitation or decrease in pump performance due to bubbles in the pump cavity is possible. The impact of cavitation is possibly damage the impeller, reduce efficiency, and increase maintenance costs. In this study, the evaluation of cavitation and the calculation of pump and head efficiency are important things to be carried out in assessing the performance of the pumping system. The pump used in this study is a Moswell Aqua 175 centrifugal pump. The piping systems are arranged in series. The variable used is flow discharge with 10 variations. The maximum flow discharge of the Moswell Aqua 175 pump is 60.7 L/min as the highest variation and the lowest variation is 9.4 L/min. The research began by compiling a series of piping systems and then draining water on the pump by varying the discharge of water flow. The calculation in this study is to find the NPSH-A (Net Positive Suction Head – Available) value, head, and pump efficiency. The results of the study showed that the NPSH-A value was above 8m and greater than the NPSH-R (Net Positive Suction Head – Required) value of 3m which means cavitation did not occur in the pump. The head value and efficiency of the pump increase significantly as the flow discharge variation increases. At the highest water discharge, which is 60.7 L/min, a head value of 9.677m was obtained with a pump efficiency of 37.93%. This shows that centrifugal pumps work more efficiently at higher flow rates.
IMPLEMENTATION EVALUATION OF THE STUDENT'S FIELD WORK PRACTICE PROGRAM IN THE VOCATIONAL SCHOOL 7 SERANG, USING THE COUNTENANCE STAKE MODEL Yulianti, Dinda; Abizar, Haris; Abdillah, Hamid
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 2 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i2.78226

Abstract

The Field Work Practice Program is prepared by educational institutions and the industrial sector. This program is designed to contribute to the vocational school students' development. However, the implementation of Field Work Practices faces several problems that affect its effectiveness. This research was conducted to evaluate the Field Work Practices in the Department of Mechanical Engineering at State Vocational High School 7 Serang City in terms of the Preparation (Antecedent), Implementation (Transaction), and Results (Outcomes) stages. This research is a mixed method evaluative research (combination method), using an explanatory sequential approach. In this study, the student population was 68, so the sample size was 68 students and 4 teachers. All Field Work Practice Student preparation consists of Regular Learning and debriefing which resulted in 82% being in the very good category, then 68 students found that 84.02% were in the very good category. The entire implementation of Field Work Practice (Transaction) which consists of the Work Orientation and Competency Period, from the teacher's perception, obtained results of 84% in the very good category and from student perception 33% in the sufficient category. After implementing the Field Work Practice (Outcomes) there was a School Assessment and Industrial Assessment, from the teacher's perception the results were 88% in the good category and from the students' perceptions the results were 81% in the sufficient category. All indicators of the Field Work Practice preparation stages (Antecedents) are considered sufficient. The implementation stages (Transactions) are considered good, but there are still shortcomings where when carrying out Field Work Practice students are still not disciplined which causes the school to be blacklisted for more than 1 year from several industries. The results of the Field Work Practice (Outcomes) evaluation were declared good.
MODIFICATION OF THE INDONESIAN GROWING BUCKET COVER DESIGN ON THE THICKNESS OF THE PIPE PLACE TO REDUCE WARPAGE USING SOLIDWORKS PLASTICS SOFTWARE Kurniawan, Perwita; Suprabo, Cornelius Tyas Lintang; Silvaro, Stefanus Bima; Hutama, Adhi Setya
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 2 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i2.77238

Abstract

Cover Indonesian Growing Bucket has a product defect problem in the form of a warpage caused by a design considered good. There was a discrepancy in the parameter settings with the initial analysis results, resulting in a difference in cooling time of 2.3 s from the original 3.9 s. This happened because parameter changes aimed to reduce warpage cycle time from the original 25.4 s to 23.8 s. Based on the problems, design modifications and analysis were carried out using Solidworks Plastics software. The design modification and analysis process was carried out using the Experiment of Analysis method, which was carried out by modifying the thickness of the part, which resulted in a warpage. The analysis was carried out to obtain optimal thickness results with the smallest cooling time gap. Modifications and design analysis are done by making three (3) alternative thicknesses for the pipe clamp section. The best modification of the three (3) alternatives made will be used as a reference basis for making material cost calculation data. From the results of design modifications and analysis, it was found that the design thickness changed to 1.5 mm. Based on the results of this analysis, alternative options are produced, which are then used as a reference in design modifications so that the resulting fill time and cycle time are more optimal.
ELECTROCHEMICAL PERFORMANCES OF NITROGEN-DOPED CARBON/MNO2 COMPOSITE SUPERCAPACITOR ELECTRODE IN KI-ADDED NA2SO4 ELECTROLYTE Sutarsis, Sutarsis; Abyan, Demas Muhammad; Kussuma, Fahrul Ardian Firmanda; Pradesar, Yusuf; Purniawan, Agung
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 2 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i2.77816

Abstract

In this study, Nitrogen-doped Activated Carbons (NAC) with different Nitrogen concentrations (NAC1, NAC2, NAC3) and Manganese Dioxide (MnO2) were composited to make the hybrid active material for supercapacitor electrodes to improve the energy density of NAC by adding the pseudo-redox capacitive properties of NAC/MnO2 composite electrode. NAC active material was made from the pyrolyzing biomass carbon and Polyaniline mixture at 800 °C in a nitrogen atmosphere for 2 hours. NAC/MnO2 hybrid material was synthesized by heating NAC: MnO2 with a ratio of 5:1 at 400 °C for 2 hours. Peaks analysis of X-ray diffraction of NAC/MnO2 powder shows that the MnO2 phase was formed as a composite with NAC. The electrochemical performance of the NAC3/MnO2 electrode exhibited the highest capacitance of 168 Fg-1 at a scan rate of 5 mVs-1 in Potassium Iodide (KI)-added Na2SO4 electrolyte. According to the Cycle Voltammetry (CV) measurement, the NAC3/MNO2 composite electrode shows hybrid capacitive behavior consisting of pseudo-redox and double-layer electrostatic energy storage mechanisms in KI-added Na2SO4 electrolyte. NAC3/MnO2 composite electrode demonstrates a high energy density of 22 Whkg-1 at 5 mVs-1.
IN-DEPTH INVESTIGATION OF VARIATIONS IN RISER QUANTITY USING EXPENDABLE MOLDS Riyanto, Obaja Eden Sentosa; J, Khansa Farrel; I.Y.H, Kyagus Ahmad; E., Wahyu Dwi; Akbar, Rafi; Lubis, Didin Zakariya
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 2 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i2.77336

Abstract

This study explores and investigates the impact of the riser quantity on shrinkage and surface quality of two cast products in the sandcasting process.  The research was conducted in several stages: preparing the mold and equipment, performing the casting process, investigating shrinkage, and inspecting the products using a macro camera. Experimental results demonstrated that the number of risers significantly influences the final product quality. Specifically, the average shrinkage for molds with one riser was found to be 3.18% and 5.01% for the first and second products, respectively. In comparison to molds with two risers presented decreased shrinkage, with averages of 0.9% and 2.06% for the first and second product, respectively. Additionally, defects investigated and observed in the first product with a single riser mold underscore the importance of riser quantity alongside casting parameters. The findings of this research highlight that increasing the number of risers can enhance casting quality by minimizing shrinkage. improving surface finish. This research presented essential insights for optimizing riser design and quantity for expendable mold in sandcasting technology to achieve superior cast products quality.
ANALYSIS OF MECHANICAL PROPERTIES OF RECYCLED ALUMINUM PISTON CASTINGS Hanafi, Mohammad; Hadi, Syamsul
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 2 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i2.76590

Abstract

The use of aluminum is increasing in the industrial sector, which is accompanied by an increase in aluminum waste if it is not handled quickly and appropriately, which will have a negative impact on the environment. Recycling is an alternative to overcome this problem. Recycling piston waste into pistons, data was obtained that there are insoluble aluminum elements, namely Cu, Fe, Si. The aim of this research is to determine the effect of recycling aluminum into pistons by tensile and impact testing with the addition of Cu 0.5%-1.5% & Fe 1%-1.5% with various tensile test speeds of 5mm/minute, 10mm/minute, and 15mm/min. The research uses independent variables, namely the addition of Cu & Fe to aluminum waste and the dependent variable is tensile strength testing and specific impact strength. The results of this research can determine how much Fe and Cu content is added in order to reach the standard piston content, increasing the hardness of aluminum without reducing the hardness and ductility too much, which is known from the strength values of recycled aluminum pistons through specific tensile and impact tests with average stress values. The highest was in Cu 1% - 1.5% & Fe 1% - 1.5% alloy with a tensile testing speed of 11 mm/minute of 196.19 MP, while the lowest stress value was obtained from Copper (Cu) 1% - 1.5 % & Iron (Fe) 0.5%-1% with a tensile testing speed of 8 mm/minute of 120.72 N/m2. The largest impact energy for aluminum piston specimens was obtained at 0.294 J in 1% - 1.5% Copper (Cu) and 1% - 1.5% Iron (Fe) alloys.
DEVELOPMENT OF LEARNING MEDIA BASED ON AN ANDROID APPLICATION AT VOCATIONAL HIGH SCHOOL 5 JAKARTA Eriansyah, Imam Mahir; Nugraha, Hari Din; Eriansyah, Rivan
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 2 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i2.76922

Abstract

This research aimed to develop a suitable Android-based mobile learning application as a learning medium for milling machine techniques at Vocational High School (SMKN) 5 Jakarta and to assess the feasibility of the EduFrais application based on evaluations by material experts, media experts, and student responses. The study employed a Research and Development (R&D) approach using the 4D model: Define, Design, Develop, and Disseminate. Validation was conducted by one material expert and one media expert. The developed media was tested on 35 eleventh-grade students majoring in Machining Techniques at SMKN 5 Jakarta. Results showed that the EduFrais application's feasibility level, based on the material expert's assessment, scored 53.00 (96.36%), categorized as "Very Suitable" and "Very Feasible." The media expert's assessment yielded a score of 50.00 (83.33%), categorized as "Very Good" and "Very Feasible." Student responses during testing were predominantly positive, with each question receiving >70% positive responses and an overall percentage of 94.28%. This indicates that the Android-based EduFrais application is suitable for use as a learning medium in milling machine technique courses. The study concludes that the developed EduFrais application meets the feasibility criteria for implementation in the Milling Machine Techniques course at SMKN 5 Jakarta.
EFFICIENCY OF COMPOST PRODUCTION IN SIDODADI VILLAGE: THE ROLE OF ORGANIC WASTE CHOPPER MACHINE TECHNOLOGY Mindarta, Erwin Komara; Wulandari, Retno; Komarudin, Komarudin; Romadhon, Afif Rizqi Nizar; Susilo, Eko; Effendi, Muhammad Idris; Setiawan, Rama Adi; Thoriq, Muhammad Syiva
Jurnal Dinamika Vokasional Teknik Mesin Vol. 9 No. 2 (2024)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v9i2.77230

Abstract

The size of organic waste affect the compost production process efficiency. There is a need to develop the chopper machine to chop the organic waste into smaller size. This study evaluates the application of Organic Waste Chopper Machine technology to improve the efficiency of the compost production process in Sidodadi Village, Ngantang District, Malang Regency. The results of the study indicate that the use of this organic waste chopper machine significantly increases the volume of compost production, shortens the composting time, and produces compost with higher nutritional quality. In addition, this technology also successfully reduces unprocessed organic waste, thus contributing positively to the environment and reducing production costs for the village community. Although this technology is effective, challenges in terms of access to spare parts and financing remain. Therefore, continued support from the government, technical training, and collaboration with educational institutions are needed to ensure the sustainability and further development of this program.
Analisis Sifat Mekanik Pada Serat Bulu Ayam Dengan Campuran Pp Sebagai Material Komposit Rikky Rifaldy; Iwan Nugraha; Faradina Choria Suci; Reza Setiawan
Jurnal Dinamika Vokasional Teknik Mesin Vol. 7 No. 1 (2022)
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v7i1.45386

Abstract

Meningkatnya konsumsi ayam tidak disertai dengan pengolahan dan pemanfaatan limbahnya di mana limbah bulu ayam hanya dibuang secara percuma. Serat bulu ayam atau chiken feather fiber ini sangat berpotensi menjadi material komposit yang tentunya harus di treatmen khusus untuk menonjolkan sifat yang menguntungkan serta mereduksi sifat yang merugikan. Penelitian ini dimulai dari observasi permasalahan pada limbah bulu ayam di sekitar Kabupaten Karawang, Tujuan dari penelitian ini yaitu untuk melakukan pengamatan sifat thermal dan sifat mekanis dari material limbah bulu ayam yang dijadikan bahan komposit, untuk melakukan pengamatan dari pencampuran dua polimer dengan berbeda sifat dan karakteristiknya. Selanjutnya mengumpulkan studi literatur yang digunakan untuk mengumpulkan data yang dibutuhkan. Data yang diperoleh diolah sesuai dengan teori berdasarkan studi literatur yang didapatkan, dianalisa serta dilihat keterkaitan permasalahannya dengan tujuan penelitian, dan selanjutnya disimpulkan. Pada penelitian ini pengujian tarik dilakukan untuk mengetahui kekuatan komposit dengan penguatan natural fiber (serat bulu ayam) dengan matrik PP (polypropilen). Dengan melakukan pengujian tarik dapat diketahui tegangan maksimum, regangan dan modulus elastisitas pada spesimen yang diuji. Spesimen yang diuji ini memiliki bentuk dan ukuran sesuai dengan standar ASTM D 638-03 dengan variasi sampel dengan persentase spesimen A : 30% fiber : 70% PP , spesimen B : 50% fiber : 50% PP ,  spesimen C :70% fiber : 30% PP. Hasil pengujian menunjukkan spesimen A : 12.724 kg/f , Spesimen B : 4.1458 kg/f, spesimen C: 3.9214 kg/f.

Page 17 of 19 | Total Record : 185

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