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All Journal Jurnal Teknik RING Mechanical Engineering Journal of Education and Teaching Learning
Saifuddin Karim
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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OPTIMASI PARAMETER DRY MACHINING PADA PROSES PEMBUBUTAN CNC MATERIAL BAKELITE UNTUK MENDUKUNG MANUFAKTUR BERKELANJUTAN MENGGUNAKAN METODE TAGUCHI Riyanto, Obaja Eden Sentosa; Muhammad Ilman Nur Sasongko; Saifuddin Karim; Jibril Maulana; Dewi Izzatus Tsamroh; Sis Nanda Kus Andrianto
RING ME Vol 5 No 1 (2025): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rme.v5i1.23600

Abstract

Penelitian ini bertujuan untuk mengoptimalkan parameter proses pemesinan kering (dry machining) pada material Bakelite menggunakan metode Taguchi, dengan fokus pada minimisasi kekasaran permukaan (Ra). Tiga parameter utama yang diuji adalah kecepatan spindle (700, 800, 900 rpm), feed rate (0,18; 0,23; 0,28 mm/rev), dan depth of cut (0,3; 0,4; 0,5 mm), yang dikombinasikan dalam desain eksperimen orthogonal array L9 (3³). Pengujian dilakukan pada mesin CNC turning LEADWELL menggunakan pahat karbida tanpa pendingin. Pengukuran nilai kekasaran permukaan dilakukan dengan surface roughness tester Mitutoyo SJ-210, dan hasil dievaluasi menggunakan rasio signal-to-noise (S/N). Hasil menunjukkan bahwa feed rate merupakan faktor paling dominan terhadap kualitas permukaan. Nilai feed rate 0,23 mm/rev menghasilkan kekasaran tertinggi, sementara kombinasi parameter optimal yaitu kecepatan spindle 800 rpm, feed rate 0,18 mm/rev, dan depth of cut 0,3 mm memberikan kekasaran permukaan terendah. Selain itu, ditemukan bahwa peningkatan kecepatan spindle cenderung meningkatkan kekasaran akibat efek termal, sedangkan depth of cut 0,4 mm menghasilkan performa terburuk dibandingkan 0,3 mm dan 0,5 mm. Metode Taguchi terbukti efektif dalam mengidentifikasi parameter optimal dengan efisiensi eksperimen tinggi, mendukung penerapan strategi pemesinan presisi berbasis prinsip manufaktur berkelanjutan tanpa pendingin.
Enhancing Heat Treatment Learning for Mechanical Engineering Students: A Comparative Study of Corrosion Inhibitor Effectiveness on Aluminium Protection Saifuddin Karim; Pradani, Yayi Febdia; Pratomo, Danang Yugo; Muhtarom, Imam; Widowati, Tamara Rahma; Wahyudi, Dian Julianto; Wulandari, Amelia Dini; Subekhi, Prido
Jurnal Teknik Vol 23 No 2 (2025): Jurnal Teknik
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v23i2.650

Abstract

Corrosion still remains a serious problem in the application of aluminum alloys, such as Aluminum 6061, which is one of the most widely used aluminum alloys in industries because of its high strength-to-weight ratio. However, the material degrades when exposed to aggressive environments, such as acidic, alkaline, or salty solutions, and the control of corrosion has been achieved with the use of synthetic chemical inhibitors, but the increasing concern of environmental and health risks has shifted attention to more eco-friendly alternatives. The present study aimed at evaluating the efficacy of three vegetable oils (coconut oil, palm oil, and soybean oil) as environmentally friendly corrosion inhibitors for Aluminum 6061, and the alloy coupons were subjected to three different corrosive solutions (hydrochloric acid, sodium hydroxide, and sodium chloride). A quantitative experimental procedure was employed to determine the corrosion rate through the measurement of the weight loss of aluminum coupons prior to and after the immersion, and the results showed that all three oils were able to reduce the corrosion rate when compared to the samples without any inhibitor. Among them, coconut oil gave the best protection, followed by soybean oil and palm oil, because the adsorption of the organic compounds and fatty acids in the oils onto the aluminum surface formed a thin layer that separated the metal and the corrosive environment. Consequently, the results also showed that the use of bio-based oils can be a promising alternative to synthetic corrosion inhibitors in industries that use aluminumbased materials.
Development of Swansoft-Based CNC Milling Simulation Module for Vocational Students : Untuk siswa SMK Negeri 1 Tuban Mella Karisma Fauzianti; Saifuddin Karim; Marsono
Journal of Education and Teaching Learning Vol.4 No.1 July (2026)
Publisher : PT Media Jurnal dan Pendidikan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59211/mjpjetl.v4i1.411

Abstract

The limited availability of actual CNC machines and high safety risks pose major obstacles to CNC programming education in vocational high schools. This study was conducted with the aim of developing a valid, practical, and effective Swansoft-based CNC Milling Simulation Learning Module to enhance the understanding of vocational high school students, particularly at SMK Negeri 1 Tuban. The study employed a Research and Development (R&D) model using the Define, Design, Develop, Disseminate (4D) framework. The test subjects were 33 students from class XI TP-3 at SMK Negeri 1 Tuban. Research instruments included validation sheets for media, language, and content experts; a comprehension test questionnaire; an implementation observation sheet; as well as pre-test and post-test questions. Validation results showed a percentage of 89.71% from media experts, 87.50% from language experts, and 86.46% from content experts, all categorized as "Very Good." The student comprehension test achieved a percentage of 87.47% in the "Very Good" category, and the implementation observation indicated that 94% of students were able to follow all practical steps well. The effectiveness test results showed a significant increase in the average score from 68.2 to 90.8, with an average N-Gain of 0.71 in the "High" category. The Swansoft-Based CNC Milling Simulation Learning Module was declared valid, practical, and effective for use as a self-directed learning medium for vocational high school students.
Changes in Machining Students’ Learning Outcomes Following CAM Design and Simulation Video Tutorials Prido Subekhi; Saifuddin Karim; Marsono Marsono
Journal of Education and Teaching Learning Vol.4 No.2 October (2026)
Publisher : PT Media Jurnal dan Pendidikan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59211/mjpjetl.v4i2.437

Abstract

Pembelajaran Computer-Aided Manufacturing (CAM) di SMK masih banyak mengandalkan penjelasan lisan dan bahan ajar tertulis, padahal materi CAM bersifat prosedural, visual, dan membutuhkan demonstrasi langkah kerja secara berurutan. Penelitian ini menganalisis pengaruh video tutorial desain dan simulasi CAM terhadap hasil belajar siswa kelas XI Teknik Pemesinan SMK Negeri 1 Singosari. Penelitian menggunakan pendekatan kuantitatif dengan desain pre-eksperimental tipe one-group pretest-posttest yang melibatkan 34 siswa melalui teknik total sampling. Perlakuan diberikan dalam lima pertemuan melalui video tutorial yang mencakup pembuatan desain, pemilihan pahat dan material, pengaturan parameter pemesinan, pembuatan toolpath, simulasi, dan verifikasi proses CAM. Instrumen penelitian meliputi tes praktik, rubrik penilaian analitik, dan kuesioner skala Likert. Validitas isi diuji melalui expert judgment menggunakan Aiken’s V dengan nilai rata-rata 0,948. Data dianalisis menggunakan statistik deskriptif, uji Shapiro-Wilk, paired-samples t-test, Cohen’s , dan Normalized Gain. Nilai rata-rata meningkat dari 57,09 menjadi 90,50. Uji paired-samples t-test menghasilkan t = −32,012 dan p < 0,001, dengan Cohen’s = 5,49 yang menunjukkan efek sangat besar. Rata-rata N-Gain sebesar 0,78, dengan 97,1% siswa berada pada kategori tinggi. Temuan menunjukkan bahwa video tutorial CAM efektif meningkatkan pemahaman prosedural, hasil belajar, dan kemandirian siswa.
Development of apd compliance observation instrument based on risk matrix for smk smaw welding practices: Instrumen observasi kepatuhan APD berbasis matriks risiko Rahmad Putra Ardyansyah; Saifuddin Karim; Marsono; Rezaqi Adenan
Journal of Education and Teaching Learning Vol.4 No.2 October (2026)
Publisher : PT Media Jurnal dan Pendidikan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59211/mjpjetl.v4i2.453

Abstract

Occupational Safety and Health (K3) is an important aspect in learning SMAW welding practices because it has a high risk of work accidents. Based on the results of initial observations in the Machine Workshop of SMKN 1 Tuban, it was found that many students still did not use complete Personal Protective Equipment (PPE) during practice. This study aims to develop a valid and effective risk matrix-based PPE compliance observation instrument to reduce K3 violations in SMAW welding practices. The research method used Research and Development (R&D) with the ADDIE model which includes the stages of Analysis, Design, Development, Implementation, and Evaluation. The research subjects were 37 students of class X Mechanical Engineering. The research instruments were a checklist for PPE use, work condition observation sheets, and a risk matrix. The validation results by three experts obtained an average score of 4.65 with a very valid category, while a CVR value of 1.00 indicated that all instrument indicators met the content validity criteria. The implementation results showed that the number of PPE use violations decreased from 81 to 37 violations. The average PPE use compliance score increased from 1.857 to 3.914.The Wilcoxon Signed Rank Test results showed a significance value of p < 0,001  and the N-Gain analysis obtained a value of 0.6127 with a moderate category. Thus, the risk matrix-based PPE compliance observation instrument is effective for improving OHS culture in SMAW welding practices.
Co-Authors Danang Yugo Pratomo Dewi Izzatus Tsamroh Dian Julianto Wahyudi Imam Muhtarom Jibril Maulana Marsono Marsono Marsono Mella Karisma Fauzianti Muhammad Ilman Nur Sasongko PRIDO SUBEKHI Rahmad Putra Ardyansyah REZAQI ADENAN Riyanto, Obaja Eden Sentosa Sis Nanda Kus Andrianto Subekhi, Prido Widowati, Tamara Rahma Wulandari, Amelia Dini Yayi Febdia Pradani