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All Journal INVOTEK: Jurnal Inovasi Vokasional dan Teknologi Martabe : Jurnal Pengabdian Kepada Masyarakat JURNAL PENDIDIKAN TAMBUSAI Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Teknomekanik Jurnal Vokasi Mekanika Tsaqofah: Jurnal Penelitian Guru Indonesia ALSYS : Jurnal Keislaman dan Ilmu Pendidikan MASALIQ: Jurnal Pendidikan dan Sains Al-DYAS : Jurnal Inovasi dan Pengabdian kepada Masyarakat Journal of Engineering Researcher and Lecturer Journal of Innovative and Creativity
Zainal Abadi
Universitas Negeri Padang
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Mechanical Engineering Social Sciences Transportation Other

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Hubungan Pemahaman Teori dan Fasilitas Kerja terhadap Prestasi Praktek Pengefraisan Kelas XI Teknik Permesinan SMK Negeri 1 Lembah Melintang Rizaldi, Ahmad; Purwantono, Purwantono; Syahri, Budi; Abadi, Zainal
TSAQOFAH Vol 5 No 3 (2025): MEI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/tsaqofah.v5i3.5619

Abstract

This study aims to determine the relationship between the understanding of milling machining theory and work facilities on the practical performance of eleventh-grade students in the Machining Engineering program at SMK Negeri 1 Lembah Melintang. The method used in this study is quantitative with a correlational approach. Data were collected through observation, documentation, and the distribution of questionnaires, then analyzed using simple regression and multiple regression. The results indicate a positive relationship between the understanding of milling machining theory and practical performance in milling machining, with a correlation coefficient of 0.357. Work facilities also show a positive relationship with practical performance, with a correlation coefficient of 0.242. Additionally, the results of the multiple regression analysis indicate that the understanding of milling machining theory and work facilities together positively relate to practical performance in milling machining, with a correlation coefficient of 0.402. The effective contribution of both variables to practical performance is 16%, with a relative contribution of understanding theory at 11.5% and work facilities at 4.5%. These findings suggest that improving theoretical understanding and providing adequate work facilities can enhance students' practical performance in milling.
Persepsi Siswa tentang Kompetensi Mengajar Mahasiswa Program Pengalaman Lapangan Kependidikan (PPLK) di Kelas XI SMK Negeri 1 Sumatera Barat Putra, Kevinda; Fernanda, Yolli; Abadi, Zainal; Andri, Junil
TSAQOFAH Vol 5 No 4 (2025): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/tsaqofah.v5i4.6661

Abstract

This study is motivated by the importance of evaluating the teaching competencies of students participating in the Teaching Practice Field Experience Program (PPLK) as an integral component in enhancing the quality of future educators. The purpose of this research is to describe students’ perceptions of the teaching competencies of PPLK students from the Faculty of Engineering, Universitas Negeri Padang, who conducted teaching practice in Grade XI at SMK Negeri 1, West Sumatra. A descriptive method with a quantitative approach was used. Data were collected through a closed-ended questionnaire using a four-point Likert scale, covering a single variable: student perception. This variable was measured through four indicators: teaching skills, knowledge, physical condition, and personality of the PPLK students. The research population consisted of all students in the Mechanical Engineering department, with simple random sampling employed for sample selection. Validity testing was conducted using the Product Moment correlation, and reliability was tested using Cronbach’s Alpha, assisted by SPSS version 25. Data were analyzed descriptively and presented as percentages. The results indicate that students’ perceptions of PPLK students’ teaching competencies fall within the "very good" category, with a percentage of 77.66%. These findings suggest that PPLK students were able to conduct the teaching and learning process effectively and were positively received by students. The implications of this study are expected to contribute to the development of a more systematic and high-quality PPLK program.
Implementasi Model Project Based Learning terhadap Hasil Belajar pada Mata Pelajaran Produk Kreatif dan Kewirausahaan (PKK) pada Kelas XI Jurusan Teknik Pemesinan di SMK Negeri 2 Dumai nst, Hafizd Syahiran; Abadi, Zainal; Waskito, Waskito; Purwantono, Purwantono
ALSYS Vol 4 No 4 (2024): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/alsys.v4i4.3326

Abstract

Vocational education is designed to develop skills, abilities, understanding, teamwork attitudes and an appreciation that includes the knowledge and information needed by a worker to enter and make progress in a useful and productive job. Factors that support the creation of quality graduates are found in the subjects of Creative Products and Entrepreneurship. This study aims to analyze the Implementation of the Project Based Learning Model on Learning Outcomes in Creative Products and Entrepreneurship (PKK) Subjects in Class XI of the Machining Engineering Department at SMK Negeri 2 Dumai. This research is a class action research (PTK) or often also called classroom action research. This Jhon Elliot model classroom action research consists of pre-cycle, first cycle and second cycle to achieve the desired results. This study uses an instrument in the form of an assessment rubric that is used to see student learning outcomes in creative product and entrepreneurship subjects with the application of project-based learning models referring to the results of projects made by students. Based on the results of research and discussion, class action research on the subject of Creative Products and Entrepreneurship in class XI Machining Engineering SMK N 2 Dumai can be concluded as follows. 1) Efforts to improve learning outcomes using project-based learning models in class XI TP in the subject of Creative Products and Entrepreneurship have been successfully implemented and are able to improve student learning outcomes at SMK Negeri 2 Dumai. 2) With the project-based learning model, teachers have other choices in determining learning models so that it can be a solution in improving student learning outcomes.
Numerical Simulation of Natural Frequency on Shaft Using ANSYS Software Yopi Zekrri Jenizah Putra; Delima Yanti Sari; Waskito Waskito; Zainal Abadi
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 3 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i3.883

Abstract

This descriptive study aims to analyze the effect of shaft diameter on the natural frequency and maximum deformation of a rotating shaft system. The analysis was conducted through numerical simulation using ANSYS Workbench software. The shaft and two symmetrically positioned disks were modeled, and a modal analysis was performed using the Finite Element Method (FEM) to determine the system’s first ten vibration modes. Simulation results showed that the natural frequencies ranged from 80.495 Hz to 280.4 Hz, with a maximum deformation of 58.903 mm occurring in the 9th mode. The lower modes (modes 1–6) exhibited lower frequencies but higher deformation, while higher modes (modes 7–10) showed more complex vibration patterns with consistently significant deformation values. This indicates that higher frequency does not necessarily result in lower deformation, and the system may still experience critical vibration. These findings demonstrate that the shaft's geometric configuration, including diameter and mass distribution of the disks, significantly affects its dynamic behavior. The simulation provides deeper insight into the vibration characteristics of the critical speed shaft apparatus used in practical experiments and serves as a reference for validating theoretical approaches such as the Dunkerley and Rayleigh methods.
Analysis of the Effect of Feed Rate, Spindle Speed and Coolant on Surface the Roughness of ST 37 Steel in the Turning Process Rahmatul Fauzan Mulyadi; Syahril; Rifelino; Zainal Abadi
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 2 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/epr1f741

Abstract

Surface roughness is an important parameter in turning processes, as it directly affects the performance and service life of mechanical components. This study aims to examine the influence of feed rate, spindle speed, and coolant application on the estimated surface roughness (Raest) of ST 37 steel under conventional turning conditions. A 2³ full factorial experimental design was employed, involving eight treatment combinations consisting of two feed rate levels (0.040 and 0.100 mm/rev), two spindle speed levels (315 and 400 rpm), and two cooling conditions (with and without coolant). Surface roughness estimation was carried out using digital image analysis with ImageJ software based on optical microscope images. The analysis utilized gray-level intensity distributions, which were then converted into roughness values using an empirical scaling approach. The results indicate that increasing the feed rate led to a rise in Raest ranging from 1.74% to 7.11%, while higher spindle speeds contributed to an increase in surface roughness between 4.54% and 11.91%. In contrast, the use of coolant reduced surface roughness by an average of 9.20%, mainly due to its role in minimizing heat and friction during machining. The optimal parameter combination was obtained at a spindle speed of 315 rpm and a feed rate of 0.040 mm/rev with coolant, producing an Raest value of 1.495 µm, which falls within ISO roughness class N7. Overall, all specimens were classified within ISO N7, indicating a semi-finishing surface quality.
Effect of Rice Husk Ash and Clay Powder as Cooling Media in Post Weld Heat Treatment (PWHT) on The Impact Toughness of SMAW-Welded SS400 Steel Angga Hermawansyah; Zainal Abadi; Delima Yanti Sari; Rifelino
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 2 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/f6gkaq38

Abstract

This study investigates the effect of variations in cooling media during Post Weld Heat Treatment (PWHT) on the impact toughness of low carbon steel SS400. The main problem addressed in this research is how differences in cooling medium characteristics influence the cooling rate, which subsequently affects the impact toughness of welded material. The objective of this study is to determine the effect of using rice husk ash, clay, and air as cooling media on the impact toughness value of SS400 steel. The experimental method was employed by applying PWHT to SMAW-welded specimens, followed by Charpy impact testing to obtain the final deflection angle, which was then converted into impact energy and impact value (HI). The results show that clay cooling medium provides the highest average impact toughness value of 1.175 J/mm², followed by rice husk ash at 1.107 J/mm², while air cooling yields the lowest value of 0.845 J/mm². These differences indicate that the thermal characteristics of the cooling media significantly influence the material’s ability to absorb energy before fracture, which is related to the stability of the cooling rate during the PWHT process. It can be concluded that variations in cooling media affect the impact toughness of SS400 steel, where more stable cooling conditions lead to higher toughness values.
Co-Authors Afriza Media Ahlal Fikri, Rivandy Akbar, Irfan Muhammad Akbar, M. William Ambyar, Ambyar Ananda, Opi Andre Kurniawan Andre Kurniawan Andri, Junil Andrian Saputra Angga Hermawansyah Anggara, Diki Anwar, Roki Putra Arafat, Andril Ardianto, Riki ARIF RACHMAN HAKIM Arwizet Arwizet, Arwizet Aslfattahi, Navid Berry Delfi Andra Budi Syahri Bulkia Rahim Daffa Raihan Senthot Daffa Raihan Senthot Delima Yanti Sari Dori Yuvenda Eko Indrawan Enggian Lubis Erizon, Nelvi Fathur Rahman fatur Rahman, fatur Fauza, Anna Niska Febri Prasetya Fernando, Dicky Pratama Fiki Efendi Fikriyyah Hilmy Ardana Firdaus Firdaus Fitra, Dinul Fonny Maswija Priscilla Ghozali, Rahmatul Gifan Ainul Mukhrim Habibie Habibie Hakiim, Evan Hamid, Taufiqul Hendri Nurdin Ibnu Hafiz Wardhana Indra, Yoan Alfarezy Iqrha, Muhammad Irma Yulia Basri Irzal Irzal Irzal, Irzal Jannuar, Arifin Jasman Jasman Jasman Jasman Kurniawan, Muhammad Ridwan Laksono Trisnantoro Marisa, Susi Muhammad Aulia Anugrah Muhammad Riski Hidayat Muharam, Bananda Mulianti Mulianti Mustaqin, Iqbal Nabawi, Rahmat Azis Nanang Qosim Nelvi Erizon Nensy Aryasandy Nofri Pratama Putra nst, Hafizd Syahiran Nur Ichsan Abdillah Nurdin Hendri Nurwijayanti Pratama, Yuhanda Dicky Primawati Primawati Primawati Primawati, Primawati purwantono purwantono Purwantono, Purwantono Putra, Alan Putra, Kevinda Putra, Rahmat Mardiansyah Putra, Randi Purnama Putra, Rido Rahmad Robby Alzam Rahmadiawan, Dieter Rahmatul Fauzan Mulyadi Ramadhan, Athaya Ramadhan, Qadri Refdinal Refdinal Refelino, Refelino Remon Lapisa Ressi Novia Windri Rifai Adlani, M. Rifaldo Novembli Rifelino Rifelino Rifelino Rilgy Aulia Rizaldi, Ahmad Rozaki Yudha, Hatami Salwa Chairani Sanjaya, Gilang Santos, Thiago F. Saputra, Muhammad Pandi Satrianto, Habib Indra Shi, Shih-Chen Subakti, Muhammad Syahril Syahril Syahril Syaputra, Afzan Syauqi Arjunanda Tasyah Tasyah Teki Haryono Wahyu Ivan Pramana Wahyu Pratama Wahyudi Wahyudi Wanda Afnison Waskito Waskito Waskito Waskito Waskito, Waskito Wulansari, Rizky Ema yahril yahril Yandi Saputra Yolli Fernanda Yopi Zekri Jenizah Putra Yopi Zekrri Jenizah Putra Yufrizal A Yufrizal Yufrizal, Yufrizal Zhuang, Wei-Ting