Articles
<![CDATA[Installation of gussets to reduce stress on the junction between the arm and bridge on the swing arm ]]>
<![CDATA[Hidayat, Nailul]]>;
<![CDATA[A, Yufrizal]]>;
<![CDATA[Nurdin, Hendri]]>;
<![CDATA[Kassimov, Farid]]>;
<![CDATA[Kenzhaliyev, Elnar]]>
<![CDATA[ Journal of Engineering Researcher and Lecturer Vol. 2 No. 2 (2023): Regular Issue ]]>
Publisher : <![CDATA[Researcher and Lecturer Society ]]>
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DOI: 10.58712/jerel.v2i2.75
<![CDATA[The swing arm is one of the main components of a motorcycle that functions as a connection between the rear wheel and the frame. Under loading conditions, the joint area between the arm and the bridge experiences significant stress, leading to fractures in that region. This study aims to investigate the effectiveness of installing gussets to reduce the stress that occurs at the joint area between the arm and the bridge in the swing arm of ELGO electric motorcycles. The research was conducted using the static analysis simulation method with Solidworks 2021-2022 Research License software. The loading conditions were simulated based on the actual usage of the electric motorcycle. The simulation results revealed that without the installation of gussets, the joint area between the arm and the bridge in the swing arm experienced stress exceeding the yield strength of the material. This would inevitably lead to the breakage of the swing arm and potentially cause accidents for motorcycle riders. However, after the gussets were installed, the stress at the joint area between the arm and the bridge remained below the yield strength of the material. Based on these findings, it can be concluded that the installation of gussets successfully reduced the stress at the joint area between the arm and the bridge in the swing arm. This research outcome can serve as a reference for the design of swing arms for electric motorcycles.]]>
<![CDATA[Optimizing student learning in Computer Numerical Control subject: A comprehensive analysis of influential factors ]]>
<![CDATA[Fadri, Muhammad Al]]>;
<![CDATA[A, Yufrizal]]>;
<![CDATA[Fernanda, Yolli]]>;
<![CDATA[Prasetya, Febri]]>
<![CDATA[ Journal of Engineering Researcher and Lecturer Vol. 2 No. 3 (2023): Regular Issue ]]>
Publisher : <![CDATA[Researcher and Lecturer Society ]]>
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DOI: 10.58712/jerel.v2i3.114
<![CDATA[The learning outcomes achieved by students are influenced by many factors. This study aims to determine the level of support of factors (motivation, interest, family, teacher's role, learning methods and learning facilities) that influence the learning process in achieving student learning outcomes in CNC learning in class XI. The subjects in the study were Class XI students majoring in Mechanical Engineering at SMK Negeri 5 Padang in the 2022/2023 academic year totalling 37 people. Because the number of research subjects (population) is less than 100 people, so all of them are taken as samples or total sampling. Data collection was carried out using observation, questionnaires and documentation. Data analysis techniques using descriptive statistical techniques. From the data analysis, it shows that of each factor studied, the learning facility factor has the lowest level of support for student academic success compared to other factors that have been studied by researchers. Therefore, learning facilities at SMK Negeri 5 Padang in CNC subjects need to be improved again to support the student learning process and achieve better learning achievements for students.]]>
<![CDATA[Effect of Cooling Media on Steel Hardness ST 37 On Conventional Lathe Process ]]>
<![CDATA[Erizon, Nelvi]]>;
<![CDATA[Ardiyansyah, M Iksan]]>;
<![CDATA[Jasman, Jasman]]>;
<![CDATA[A, Yufrizal]]>
<![CDATA[ Teknomekanik Vol. 1 No. 1 (2018): Regular Issue ]]>
Publisher : <![CDATA[Universitas Negeri Padang ]]>
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DOI: 10.24036/tm.v1i1.372
<![CDATA[This study aims to determine the type of air cooling media, soluble oil, and air to the result on lathe ST 37 steel. The cooling medium is very important to maintain boring tool deformation and can add product quality. In the process lathe of friction between the workpiece and chisel cut that can produce overheating and influence on the result of the slice boring tool on the workpiece. The research that will be carried out is experimental research with variables that are controlled that is feeding, deep of a cut, and spindle rotation and examination of the hardness of the specimen on the object before done lathe. The sample in this study which is ST 37 steel with diameter 25 mm and length 60 mm as many as 9 specimens which will be done lathe with different type media kind inprocess working. To know influence the type of cooling medium against steel ST 37 is done brinnel hardeness test using test equipment hardness tester. Of the 9 specimens lathe will be determined 3 points to do hardeness tests. From the result of hardness test and analysis obtained from hardness test on steel ST 37 average data that is use of soluble refrigerant media that produce a very good cooling at the time of the lathe process. The results of research is obtained that the use of soluble refrigerant media is the best with an average hardness of 224.10 kg / mm². On the lathe process, the cooling media has oil content will be able to maintain the scores hardness and time-worn on boring tool. Thus to maintain the hardness values can be used soluble oil cooling media and to increase the hardness values of workpieces can be used air cooling media.]]>
<![CDATA[Comparison of Accuracy in Cutting Dental Profiles Between Differential Methods Approach Upward with a Lower Approach to Making Straight Gear Wheels ]]>
<![CDATA[Agustian, Ganda]]>;
<![CDATA[A, Yufrizal]]>;
<![CDATA[Irzal, Irzal]]>
<![CDATA[ Teknomekanik Vol. 1 No. 2 (2018): Regular Issue ]]>
Publisher : <![CDATA[Universitas Negeri Padang ]]>
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DOI: 10.24036/tm.v2i2.1672
<![CDATA[In the world of industrial gear use, it cannot be denied, every machine in the industrial world uses a component, namely gears to move rotating power. For this reason, in making gears the precision of the gear profile must be considered. The purpose of this study is to compare the accuracy of cutting the dental profile between the approach differential method and the approach to the bottom. This research is an experimental research. Based on the results of data analysis on the comparison of the precision of cutting dental profiles between the approach differential methods and the approach to the bottom, the upward approach is more appropriate in terms of thickness and number of teeth. The number of samples used in the study of 12 gears consisting of 6 gears was carried out with the approach differential approach method, and 6 gears were carried out by the differential approach approach method. Each sample is measured in thickness and the number of teeth in a straight gear. After measurement, the data is processed using the t-test formula to see the significant difference in the accuracy of the dental profile. Based on the results of the t-test analysis that has been carried out there are differences in the gears produced. The approach to differential approach to getting better gear results.]]>
<![CDATA[Design and Testing of Belt Grinding Development ]]>
<![CDATA[Setiawan, Sepdirama]]>;
<![CDATA[K, Arwizet]]>;
<![CDATA[Syahri, Budi]]>;
<![CDATA[Ambiyar, Ambiyar]]>;
<![CDATA[Darmawi, Darmawi]]>;
<![CDATA[A, Yufrizal]]>
<![CDATA[ Teknomekanik Vol. 1 No. 2 (2018): Regular Issue ]]>
Publisher : <![CDATA[Universitas Negeri Padang ]]>
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DOI: 10.24036/tm.v2i1.1772
<![CDATA[The author observes that the use of belt grinding is still rare in the writer's own environment, both in the fields of education and small industries, because there are still many people who are fixated on ordinary grinders, and think that ordinary grinders are better in all work. The development of belt grinders has changed people's perspectives through the development that the authors have done, with increasing belt grinding functions through development which will certainly make belt grinders even more useful. This belt burrs are made and developed through pre-existing belt grinding shapes. The result of this development is a belt grinder which has a function more than the belt grinder which is already before. This belt burrs has three types of work functions, namely vertical, horizontal, and cutter, and also features speed control. With the development that the author does, of course, it will change people's perspectives because belt grinding has a function that is better than before and can better help the work of a grinding process.]]>
<![CDATA[Comparative Analysis Spindle Speed Constant with Cutting Speed Constant against Surface Roughness Gradual Turning Steel ST 37 on the NC PU 2A Machine ]]>
<![CDATA[Efendi, Defindo]]>;
<![CDATA[A, Yufrizal]]>;
<![CDATA[K, Arwizet]]>
<![CDATA[ Teknomekanik Vol. 1 No. 2 (2018): Regular Issue ]]>
Publisher : <![CDATA[Universitas Negeri Padang ]]>
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DOI: 10.24036/tm.v2i1.2272
<![CDATA[Parameters of spindle speed and cutting speed affect surface roughness in the turning process. The purpose of this research is to know the comparison of the level surface roughness resulting from the parameters of spindle speed constant and cutting speed constant. The method of this research is experimental research, by performing gradual turning process on the steel ST 37 specimens in the NC PU 2A EMCOTURN 120 machine. The number of specimens is 6 specimens, each specimen is gradual turned as much 3 levels, each level is tested as much 3 points of surface quality using "Surface Tester Mitutoyo SJ-201P". The results of the research were analyzed using descriptive statistics by taking the average value of the two parameters. Based on the analysis of the data from the results of the research conducted, the surface roughness produced using a cutting speed constant (G96) is better than the spindle speed constant (G97). Cutting speed constant is more stable when cutting in gradual turning.]]>
<![CDATA[Manufacture and Testing of Belt Grinding Development ]]>
<![CDATA[Zulmaidas, Ikhsan]]>;
<![CDATA[Syahrul, Syahrul]]>;
<![CDATA[Ambiyar, Ambiyar]]>;
<![CDATA[A, Yufrizal]]>
<![CDATA[ Teknomekanik Vol. 2 No. 1 (2019): Regular Issue ]]>
Publisher : <![CDATA[Universitas Negeri Padang ]]>
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DOI: 10.24036/tm.v2i1.2972
<![CDATA[The lack of utilization of belt grinding, especially in the world of education due to lack of public understanding of the workmanship of belt grinding. This study discusses the process of developing belt grinders from the manufacturing stage to testing. The purpose of this study is to develop belt grinders of existing forms, to maximize their function. The belt burrs resulting from this development have three functions, namely the vertical, angle and horizontal cutting function. This belt burrs are also equipped with speed control. With the development of this belt grinder, it is hoped that it will add to the public's insight into the belt grinding function and better assist the work of grinding, especially grinding finishing.]]>
<![CDATA[Effect of sonication to the stability properties of carboxymethyl cellulose/uncaria gambir extract water-based lubricant ]]>
<![CDATA[Rahmadiawan, Dieter]]>;
<![CDATA[Ilhamsyah, Febrian]]>;
<![CDATA[Abral, Hairul]]>;
<![CDATA[Laghari, Imtiaz Ali]]>;
<![CDATA[A, Yufrizal]]>
<![CDATA[ Teknomekanik Vol. 5 No. 2 (2022): Regular Issue ]]>
Publisher : <![CDATA[Universitas Negeri Padang ]]>
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DOI: 10.24036/teknomekanik.v5i2.16972
<![CDATA[This study examined the effect of sonication on FTIR and stability at various temperatures in water-based lubricants with a mixture of Carboxymethyl Cellulose (1wt%) and Uncaria Gambir extract (1wt% and 2wt%). The sample was prepared by mixing the two materials into distilled water using a magnetic stirrer and sonicator with time variations of 5 and 10 minutes. Before mixing, the Uncaria Gambir extract solution with water is first centrifuged to remove the dregs in the Uncaria Gambir extract powder. Stability was carried out in an open room (28oC), drying oven (50oC), and refrigerator (5oC). The stability test results showed that the mixture of Carboxymethyl Cellulose and Uncaria Gambir had good stability at all temperatures after sonication for a short duration. The longer sonication duration could fuse the fibrils of Carboxymethyl Cellulose, leading to increasing particle size. FTIR results also show that there is no chemical reaction that occurs. After adding the gambier, there was a new peak at wave 800-1300 cm-1, corresponding to the gambier. The results of this study indicate that the Carboxymethyl Cellulose and Uncaria Gambir solution can be a potential lubricant additive. The Carboxymethyl Cellulose can be a viscosity modifier, while Uncaria Gambir extract for corrosion inhibitor.]]>
<![CDATA[From passive to critical consumption: The role of educational content in short videos to improve students' critical thinking skills ]]>
<![CDATA[Aspar, Fathir]]>;
<![CDATA[Refdinal, Refdinal]]>;
<![CDATA[Erizon, Nelvi]]>;
<![CDATA[Jasman, Jasman]]>;
<![CDATA[Irzal, Irzal]]>;
<![CDATA[A, Yufrizal]]>
<![CDATA[ Jurnal Pendidikan Teknologi Kejuruan Vol 8 No 1 (2025): Regular Issue ]]>
Publisher : <![CDATA[Universitas Negeri Padang ]]>
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DOI: 10.24036/jptk.v8i1.42323
<![CDATA[The engaging and personalized nature from short video makes it quickly popular, yet concerns persist about their potential to diminish critical thinking skills. This study investigates whether short videos with educational content can improve students' critical thinking skills. Using a quasi-experiment method, Thirty-three participants were divided into control and experimental groups, with critical thinking measured using the Holistic Critical Thinking Scoring Rubric (HCTSR) based on essay analysis in pretest and posttest. After administering educational short videos to the experimental group, the results showed that there was an increase in students' critical thinking skills, shown by the result of controlling the pretest variable through the ANCOVA test with a p-value of <0.001. The result highlights the potential of educational short videos as tools for fostering critical thinking by providing interventions which prioritize treatment fidelity through standardized protocols (SOPs) for content delivery, validating assessment tools, and structuring content design. Recommendations for future research include larger sample sizes, repeated data collection at strategic intervals, and rigorous validation of question complexity.]]>
<![CDATA[The Influence of Learning Motivation Using the Project-Based Learning Model on Student Learning Outcomes in PKK Subjects at SMK Negeri 5 Padang. ]]>
<![CDATA[Paderma, Deri Syafamukmin]]>;
<![CDATA[Efendi, Fiki]]>;
<![CDATA[A, Yufrizal]]>;
<![CDATA[Rahim, Bulkia]]>
<![CDATA[ Jurnal Vokasi Mekanika (VoMek) Vol 7 No 3 (2025): Jurnal Vokasi Mekanika ]]>
Publisher : <![CDATA[Departemen Teknik Mesin Fakultas Teknik Unversitas Negeri Padang ]]>
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DOI: 10.24036/vomek.v7i3.849
<![CDATA[The main problem in this research is: How does learning motivation using the Project Based Learning Model affect learning outcomes in Class XI PKK subjects at SMK Negeri 5 Padang. The aim of this research was designed to: measure the influence of learning motivation using the Project Based Learning model on learning outcomes in Class XI PKK subjects at SMK Negeri 5 Padang. In this research, researchers used quantitative research methods, namely correlational research. Correlational research is research used to find out the magnitude of the relationship between variables. The sample for the research carried out was 31 students in the Class XI PKK subject at SMK Negeri 5 Padang. This research aims to measure the influence of learning motivation using the Project-Based Learning model on learning outcomes, using questionnaire instruments and test sheets that are filled in before and after being given treatment. Descriptive analysis shows that the average student learning motivation score is in the high category, while the average learning outcomes are in the good category. Correlation between Learning Motivation and Learning Outcomes: The correlation value of 0.963 is greater than the r table of 0.355, which shows that there is a significant positive relationship between students' Learning Motivation and their learning outcomes. The conclusion from this research is that students' learning motivation has a significant relationship to their learning outcomes in implementing the Project-Based Learning model. Student learning motivation is proven to have a greater influence on learning outcomes.]]>
