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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 20 Documents
 1   2 
The Effectiveness Of Peer Teaching In Achieving Student Understanding In The Subject Of Milling Techniques Yusuf, Arya; Wulida, Siti Nursipa; Dzal Yahya, Muhammad Yusri
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 1 (2024): June 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/mbq7ba12

Abstract

Education is one of the important human needs that cannot be separated in everyday life. Differences in individual understanding cannot be ignored at every level of human education. Therefore, teachers are required to design learning methods that are able to increase the effectiveness of the individual needs of learnersThe method used in designing this research is quasi experiment. the population in this study amounted to 36 students who were divided into two groups in one class at SMK Negeri 1 Nanggulan. The experimental design used is post test only control group design, which consists of a control class and an experimental class, each of which has a value. The average value on the understanding of the experimental class post-test results shows a value of 82.444 higher than the mean value of the control class. Nmax the experimental class showed 96.50 and Nmin of 72.50. Meanwhile, the Nmax of the control class showed 76.00 and Nmin of 64.00.  The Pvalue of homogeneity (Levene's) >0.05 is 0.081 which indicates that the data is normally distributed. Then the normality test Pvalue results are below <0.05 which is 0.040 (experimental), 0.019 (control) by comparing the significance level Pvalue <0.05 then H0 is rejected and H1 is accepted. Peer teaching research proves that it is effective for improving student understanding in the subject of milling techniques of multilevel milling material.
THE EFFECT OF VARIATIONS IN THE DIAMETER AND NUMBER OF GROUNDSTRAP WINDINGS  ON THE PERFORMANCE OF A 150 CC ENGINE Putra, A.Afriansyah; Paloboran, Marthen; Parenrengi, Syafiuddin; Yusuf, Andi Zufikar; Halim, Muh Bhilal
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 1 (2024): June 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/vx3rtc76

Abstract

This research is a type of experimental research which aims to determine the effect of varying the diameter and number of groundstrap turns on the spark plug cable on power, torque, AFR and fuel consumption of a 150 CC motorbike engine. The results of the research show that there is a significant influence on engine power by using variations in the 0.3 mm diameter of the 260 winding groundstrap with an increase of 0.53 hp. When varying the diameter of 0.6 mm of winding 155 on power there is a significant influence with an increase of 0.52 HP and using a variation of 0.9 mm of winding 103 on power there is a positive influence with an increase of 0.43 HP. The use of groundstrap on engine torque with three types of variations increased by 1.03 Nm, 0.63 Nm and 0.75 Nm. There is no significant effect of using groundstrap on AFR. For the effect of using a groundstrap on fuel consumption, the variations with the most positive influence are the 0.3 mm diameter of the 260 winding and the 0.6 mm diameter of the 155 winding.
Interactive Learning Media Methods In The Field Of Mechanical Engineering: A Case Study Of Engineering Drawing Subjects Zuliansah, Rizky Adi; Qolby ‘Alya, Najmy; Aprillia, Risma; Muttaqin, Shofya Azzahra; Hamdani, Husni
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 1 (2024): June 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jkekm569

Abstract

This study aims to find out whether the methods in interactive learning media that have been applied are appropriate or not. The application of interactive learning media methods to engineering drawing learning can improve learning efficiency, strengthen concept understanding and improve students' practical skills in mechanical engineering learning. This study uses a qualitative descriptive method with case studies as the main method. Data is collected through questionnaires and in-depth analysis so that it becomes a whole sentence as a whole. The results of the research that has been carried out show that the most effective learning model uses the practicum model in engineering drawing subjects. In addition, teaching aids also affect students' understanding of teaching materials in engineering drawing subjects. Thus, teachers must be able to make an interactive learning so that students understand the technical drawing material to the maximum.
ANALYSIS OF THE EFFECT OF NaOH PERCENTAGE ON THE TENSILE STRENGTH OF SISAL FIBER (AGAVE SISALANA) AND POLYURETHANE COMPOSITES USING THE COMPRESSION MOLDING METHOD paundra, fajar; Sidik, M. Farhan; Muhyi, Abdul; Nurullah, Fajar Perdana; Pujiyulianto, Eko; Syanur, Farid Nanda
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 1 (2024): June 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/vbwm5m25

Abstract

The percentage of NaOH is one of the parameters that greatly affects the sisal fiber composite (Agave Sisalana). The purpose of this study was to observe and analyze the effect of the percentage of NaOH on the tensile strength of sisal fiber composites (Agave Sisalana). The materials used are sisal fiber (Agave Sisalana) and polyurethane resin at various percentages of NaOH, namely without treatment (0%), 4%, 7%, and 10% with soaking time for 2 hours and drying in the sun for a maximum of three days or until the fiber is completely dry. Composite manufacturing was carried out using the compression molding method for 24 hours at a pressure of 50 bar. The tests carried out in this study were tensile tests referring to the ASTM D 638 standard. The percentage of NaOH without treatment (0%) has the lowest maximum tensile value of 6.688 MPa, while the percentage of 7% NaOH has the highest maximum tensile strength value of 11.821 MPa. Then, the percentage of NaOH without treatment (0%) has the lowest maximum elastic modulus value of 0.072 GPa, and the highest maximum elastic modulus value of 0.152 GPa is also found at 7% NaOH percentage.
DEVELOPMENT OF LEARNING MEDIA FOR MOTORCYCLE ELECTRONIC FUEL INJECTION SYSTEM BASED ON FLIP HTML5 AT THE DEPARTMENT OF MOTORCYCLE ENGINEERINGAT SMK SUMBER DAYA BEKASI Sugiarto; C Rudy Prihantoro; Ratu Amilia Avianti
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 02 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/vcbha416

Abstract

The development of technology and information is very rapidly growing and influential in the world of education. Technology and information in learning are very helpful for educators in utilizing technology facilities to prepare for the learning process or when the learning process takes place. This study aims to develop Flip Html5-based e-book learning media for motorcycle Electronic Fuel Injection system material. This research uses the Research and Development (R&D) method using the 4D development model in its development, which must go through an expert assessment as a successful process of testing the feasibility of the developed product before it is later tested and used. The results of the feasibility test of Flip Html5-based e-book learning media get a percentage of 96.36% from material expert validators, 94.54% from media expert validators, and 89.23% from the results of the media feasibility test of 35 students. So, the results that have been carried out can be concluded that the Flip Html5-based e-book learning media for Motorcycle Electronic Fuel Injection system material developed in this study are "Very Feasible" to be used as a learning resource for students in learning.
THE EFFECT OF VARIATIONS IN CURING TEMPERATURE OF CARBON FIBER/PVC FOAM BOARD SANDWICH COMPOSITES ON BENDING TEST FAILURE ANALYSIS paundra, fajar; Saputra, Rizky; Pujiyulianto, Eko; Arif, Muhamad Fatikul; Muhyi, Abdul
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 1 (2024): June 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/xq8fy218

Abstract

Curing is a method to improve the ability of sandwich composite materials by heating the sandwich composite in an electric oven for a certain time and temperature. This research aims to observe and analyze the effect of curing temperature on bending strength and elastic modulus as well as analyzing the fracture results of sandwich composites. The materials used are polyester resin, 240 gsm twill carbon fiber and PVC foam core with a thickness of 5 mm. The manufacturing method used is vacuum bagging and the curing process is carried out with temperature variations of 70°C, 80°C and without curing for 1 hour. The test carried out is a bending test using the ASTM C393 standard. The maximum bending strength value of the sandwich composite is found at a curing temperature of 80°C, namely 48.35 MPa, while the lowest bending strength value is found in the variation without curing, namely 30.07 MPa. The highest elastic modulus value is also found at a curing temperature of 80°C, namely 67.03 GPa and the lowest elastic modulus value is also found in the variation without curing, namely 33.67 GPa.
EFFECT OF PREHEATING TEMPERATURE VARIATION ON MICROSTRUCTURE AND HARDNESS OF WELD OVERLAY CLADDING OF SS400 CARBON STEEL BY SMAW METHOD paundra, fajar; Rajagukguk, Kardo; Aldyansyah, Dimas; Pujiyulianto, Eko; Muhyi, Abdul
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 02 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/eyamkr90

Abstract

SS400 carbon steel is a type of low carbon steel that has low surface hardness, wears easily, and is not resistant to impact. The application of cladding can reduce the risk of material failure due to the weakness of SS400 carbon steel. In this study, cladding was performed by SMAW method using HV-600 electrodes and a current of 115 A. This welding process causes heat to be concentrated in the melting area, resulting in uneven heating and cooling, so preheating is necessary. This study aims to evaluate the effect of preheating temperature variations of 200°C, 300°C, 400°C, and non-preheating on microstructure and hardness in the cladding process. Macro structural testing shows that the application of preheating can minimize the occurrence of welding defects, and an increase in preheating has an effect on increasing the depth of the HAZ in each specimen tested.  Microstructure testing shows that the application of higher preheating will form more ductile phases in the base metal, diffusion layer, HAZ areas. The base metal area has pearlite and ferrite phases. The diffusion layer shows clear boundaries as a result of the diffusion process. The HAZ section forms a fine pearlite microstructure and coarse pearlite and ferrite phases. The weld metal layer is not affected by the preheating temperature used, there are martensite and ferrite phases. Hardness testing on 200oC preheating specimens has the highest hardness in the weld metal of 680.11 HV. Hardness in the diffusion layer, HAZ, and base metal which shows that an increase in preheating temperature affects the decrease in the hardness value of the specimen.
DEVELOPING ANALOG AND DIGITAL ELECTRONIC MEDIA KITS FOR AUTOMOTIVE ENGINEERING EDUCATION STUDENTS Siswanto, Ibnu; Prasetyono, Agus Puji; Sudarwanto, Sudarwanto; Purwanto, Purwanto; Rudiyanto, Atha Fawwaz
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 02 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/btnq6g69

Abstract

Instructional media has an important function for facilitating academia to achieve the learning objectives. Therefore, this study aims to develop an instructional media of the analog and digital electronics for automotive engineering education students. This study used a research and development method which consisting of 4D steps (define, design, development, and dissemination). The instructional media feasibility assessment from the lecturers and students was obtained using a questionaire. The lectures and students, after assessing the media kits, both were suggested that it has a good lay out, appropriate with the learning outcomes, and feasible for benefitting university learners in analog and digital electronics course especially in practice courses. The implementation of this analog and digital electronic media improves the students achievement in the basic analog and digital automotive electronics courses
EFFECT OF VARIATION IMMERSION TIME  FIBER HEMP COMPOSITE USING NaOH MATRIX POLYURETHANE ON TENSILE STRENGTH METHOD paundra, fajar; Wibawa, Gilang Putra; Pujiyulianto, Eko; Syaukani, Muhammad; muhyi, Abdul; Nurullah, Fajar Perdana; Syanur, Farid Nanda
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 02 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/4sj3jr07

Abstract

NaOH immersion treatment on hemp fiber is very important in making composites. This is because natural fibers still contain materials such as lignin and hemicellulose so hemp fibers are cleaner and can provide strong fiber and resin attachment. The aim of this research is to find out how the best time for soaking in NaOH for hemp fiber compares to the tensile strength of hemp fiber composites. The materials used are polyurethane and hemp fiber. The research focused on variations without treatment, 2 hours, 3 hours, 4 hours, and 5 hours with a percentage of 5% NaOH and dried under direct sunlight after soaking. Composite manufacture was carried out using the compression molding method for 24 hours with a pressure of 5 bar. Tensile testing was also used in this research with reference to the ASTM D 638 standard. The fiber surface experiences changes in shape such as cleanliness, color and fiber structure which are different in each variation. It should be noted that the maximum tensile strength is 11,597 MPa at 4 hours of immersion, and the lowest tensile strength is 6,054 MPa at 5 hours of immersion. Then the lowest modulus of elasticity value is found in the variation without treatment at 0,049 GPa. The highest value of elastic modulus is found in the 4 hour variation with a value of 0,076 GPa.
ERGO-MECHANICAL APPLICATIONS IN SMALL-SCALE SMAW WELDING TABLE DESIGN Bawa Susana, I Gede; Alit Triadi, Anak Agung; Kawirian, Wisnu
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 02 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/hpkf3b19

Abstract

SMAW (shielded metal arc welding) is widely used in almost all types of welding work, including small industries. In small industries, workers doing SMAW welding work are generally done by squatting. This work posture causes musculoskeletal complaints in workers as a result of unnatural work postures. To overcome this is done through ergo-mechanical applications to create aids in the form of welding tables. Ergonomically based on worker anthropometric data, while mechanically with the selection of strong, lightweight, and affordable materials in terms of cost. The results of testing the welding table design based on ergo-mechanical applications provided a decrease in musculoskeletal disorders in workers. Workers' musculoskeletal disorders can be reduced by 24.61%. From the moderate category, an average of 51.6, to the light category, with an average of 38.9. The ergo-mechanical application will produce work tools that are comfortable for workers to use and meet technical standards related to specifications as a description of the technical characteristics of a work tool.  

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