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All Journal Jurnal Pembangunan Nagari MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Jurnal Teknik Industri Terintegrasi (JUTIN) Jurnal Surya Teknika AEEJ : Journal of Automotive Engineering and Vocational Education Journal of Scientech Research and Development Jurnal Teknik, Komputer, Agroteknologi dan Sains TOFEDU: The Future of Education Journal Edumaspul: Jurnal Pendidikan
Mukhnizar
Program Studi Teknik Mesin, Fakultas Teknik Dan Perencanaan, Universitas Ekasakti.
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Mechanical Engineering Public Health Social Sciences Transportation Other

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Pembuatan Alat Uji Putaran Kritis Poros Jufrizal, Ryan; Mukhnizar, Mukhnizar; Afdal , Afdal; Abu , Risal; Zulkarnain , Zulkarnain
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 6 No. 4 (2023): Oktober
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v6i4.26059

Abstract

This critical shaft rotation test tool is used to calculate the maximum deflection of a steel shaft. Currently, the critical shaft rotation test tool still uses human power to operate it, namely by rotating the handle to read the rotation value. So the test results carried out are not effective and accurate. This tool uses an electric motor with ¼ HP power and 2800 Rpm rotation as the driving force. So that the results are more accurate, this tool is designed to use an electronic system (sensor) equipped with a digital counter. Making this critical rotation test tool for the shaft goes through several processes, namely, making a table or position of the critical rotation test tool for the shaft using a digital counter, selecting the disk (load), selecting the bearing (pillow block), selecting the electric motor, selecting the shaft, and selecting the voltage regulator. . The testing phase has undergone several testing stages and the results are as planned. The tool that has been made can be operated effectively and obtain results as planned, and its operation is very easy.
Analysis of the Effect of the Cooling System Modification on the Engine Performance of the Wuling Confero Khairi, Ullul; Abu, Risal; Mukhnizar, Mukhnizar
The Future of Education Journal Vol 4 No 8 (2025): #2
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v4i8.1149

Abstract

This study aims to analyze the effect of cooling system modification on the engine performance of the Wuling Confero vehicle. The main focus of this research is to evaluate the impact of thermostat removal and the use of plain water as a substitute for radiator coolant on engine operating temperature, engine speed (RPM), and fuel consumption. The research method used was a quantitative experimental approach, with direct testing using a Vehicle Diagnostic System (VDS) to obtain real-time data on operating temperature, RPM, and fuel consumption. The tests were conducted under three different conditions: the factory-standard cooling system (using a thermostat and coolant), the system without a thermostat, and the system using plain water. The results show that the factory-standard cooling system produced the most stable engine performance, with an optimal operating temperature of 80–92°C, stable RPM at around 750 ± 5, and the lowest fuel consumption of 3.8 ml/min. In contrast, the removal of the thermostat resulted in high temperature fluctuations (±6–8°C), unstable engine speed reaching up to 825 RPM, and the highest fuel consumption at 5.2 ml/min. Meanwhile, the use of plain water showed no statistically significant difference but caused moderate temperature fluctuations (±4.3°C) and a higher risk of long-term corrosion. The Wilcoxon statistical test indicated significant differences between the standard and thermostat-removed systems (Z = −2.81; p < 0.05), as well as between the thermostat-removed and plain-water systems (Z = −2.14; p < 0.05). Cooling system modification particularly by removing the thermostat has a negative impact on temperature stability and engine thermal efficiency. The factory-standard cooling system remains the most efficient configuration and is strongly recommended to maintain optimal performance, fuel efficiency, and engine durability.
Analysis of the Tempering Process Results with Temperature Variations on the Mechanical Properties of AISI 4340 Material Hardness Giano, Jordy; Abu, Risal; Mukhnizar, Mukhnizar
The Future of Education Journal Vol 4 No 8 (2025): #2
Publisher : Lembaga Penerbitan dan Publikasi Ilmiah Yayasan Pendidikan Tumpuan Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61445/tofedu.v4i8.1182

Abstract

This study aims to determine the effect of tempering temperature variations on the hardness of AISI 4340 steel after undergoing a quenching process. AISI 4340 is a high-strength low-alloy steel widely used in manufacturing industries, making the control of its mechanical properties through heat treatment crucial. In this study, the steel specimens were initially heated to 800°C and rapidly cooled (quenched) in water. Subsequently, the specimens were subjected to tempering at three different temperatures—200°C, 400°C, and 600°C—with a holding time of 60 minutes. The mechanical properties were evaluated using the Rockwell hardness test (HRC scale) with three measurement points on each specimen. The results indicate that variations in tempering temperature significantly affect the hardness of the steel. Tempering at 200°C produced the highest hardness value of 22.00 HRC due to the presence of tempered martensite with fine carbide precipitation. At 400°C, the hardness decreased to 15.90 HRC, attributed to the transformation of martensite into ferrite and fine cementite (troostite). Meanwhile, tempering at 600°C resulted in a hardness value of 17.80 HRC, characterized by a more stable and ductile sorbite structure. Overall, the findings show that increasing tempering temperature generally decreases hardness while enhancing the ductility of AISI 4340 steel.
Contribution of Pedagogical Competence and Transformational Leadership of the Principal to the Implementation of the Tasks of Design and Build Teachers at SMKN 1 Padang Melda Fajra; Jalius Jama; Sukardi Sukardi; Danyl Mallisza; Mukhnizar Mukhnizar; Oskah Dakhi
Edumaspul: Jurnal Pendidikan Vol 6 No 2 (2022): Edumaspul: Jurnal Pendidikan
Publisher : Universitas Muhammadiyah Enrekang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33487/edumaspul.v6i2.5248

Abstract

This study aims to reveal and analyze how much (1) the contribution of pedagogical competence to the implementation of teacher duties, (2) the contribution of principals' transformational leadership to the implementation of teacher duties and (3) the contribution of pedagogical competence and principals' transformational leadership to the implementation of teacher duties of SMKN 1 Padang both individually and together. This research uses a quantitative approach. The population is all teachers at SMKN 1 Padang totaling 89 people, while the sample is 56 people determined by Stratified Proportional Random Sampling technique and the strata used are educator certification and length of service. Data were obtained using a Likert scale questionnaire that had been tested for validity and reliability. The results of data analysis show that (1) pedagogical competence contributes significantly to the implementation of teacher duties by 19.2%. (2) principals' transformational leadership significantly contributed 8.2%, while (3) pedagogical competence and principals' transformational leadership together contributed 24%. Data analysis has shown that the three hypotheses can be accepted empirically. From the findings, it can be concluded that pedagogical competence and principals' transformational leadership are two independent variables that have a positive impact on the dependent variable of teachers' task implementation. To improve the implementation of the duties of teachers of SMKN 1 Padang, it is necessary to improve through pedagogical competence and transformational leadership of principals properly and responsibly.
Co-Authors Adami, Mukhlis Adi Candra, Adi Afdal Afdal Afdal Afdal , Afdal Afdal Afdal, Afdal Ahmadi, Syukri Algusra, Jeri Amsal, Amsal Antonnius, Antonnius Azmil Azman Bio Oktonius Manurung Danyl Mallisza Didik Agung Nugroho Eka Satrya Fadlan, Muhammad Fauzan, Idham Fernando, Pungki Giano, Jordy Gowasa, Estomi Hihamsyah, Diva Puperta Irpandi, Wahyu Ivonne Ayesha Jalius Jama Jufrizal, Ryan Khairi, Ullul Koto, Rahmat Desman Melda Fajra Muhammad Abdillah Muhammad Rafly Ramadhan OSKAH DAKHI Pratama, Bagas Adi Pratama, Hardian Putra, Afrionaldi Rahman, Hidayatur Risal Abu Risal, Abu Rivaldy Oktari Hidayat Rizky Maulana, Rizky Septiawan, Abel Sukardi, Sukardi Tio Bonardo Veny Selviyanty Widi, Widi Yurnalis Zega, Toniman Zulkarnain Zulkarnain Zulkarnain , Zulkarnain Zulkarnain Zulkarnain