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All Journal Rotasi Rekayasa Mesin ROTOR: JURNAL ILMIAH TEKNIK MESIN JURNAL INTEGRASI Jurnal Teknologi dan Riset Terapan (JATRA) Journal of Engineering and Applied Technology Jurnal Pengabdian kepada Masyarakat Politeknik Negeri Batam J-ENSITEC (Journal of Engineering and Sustainable Technology) Journal of Applied Mechanical Technology (JAMET)
Pamungkas, Nurman
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Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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EFFECT OF WELDING SEQUENCE ON DISTORTION RESULTS IN BRACKET CONNECTIONS Suheri, Suheri; Widodo, Syamsul Bahri; Arif, Zainal; Surawan, Surawan; Ali, Sulaiman; Pamungkas, Nurman; Syafii, Muhamad
ROTOR Vol. 17 No. 1 (2024)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/rotor.v17i1.49037

Abstract

The distortion in the shape of the weld specimen is influenced by the uneven heat distribution during the welding process. There is also distortion in the welding modeling performed on the bracket joint. The modeling scenario of the bracket joint forms the basis for measuring the distortion results. Therefore, when we model the bracket joint, we obtain varying distortion results. There are three lines to observe the distortion effects. Lines a, b, and c are located on the X and Y axes (center), while line c is on the X and Y axes (+). Line a is on the X and Y axes (-). The test specimen that has been modeled is the result of numerical modeling, which is then used to calculate the magnitude of the distortion on the longitudinally stiffened plate test specimen. For the numerical modeling of the bracket joint, the result of scenario 1 is distortion. Meanwhile, the distortion results of the bracket joint modeling in scenarios 1 and 2 show that the distortion value obtained in scenario 2 is higher than that obtained in scenario 1. This is influenced by the order of welding lines used in the bracket joint modeling.
Experimental Study : Thermal Variations and Pressure's Impact on Plastic Injection Molding Quality Leksonowati, Nur Fitria; Pamungkas, Nurman; Manurung, Meilani Mandalena
ROTASI Vol 26, No 3 (2024): VOLUME 26, NOMOR 3, JULI 2024
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.26.3.50-56

Abstract

This study investigates the effects of varying hot water temperatures (75℃, 85℃, and 95℃) and injection pressures (328 Bar and 928 Bar) on the outcomes of experimental tests in injection molding. Results indicate that at 75℃, 85℃, and 95℃ with an injection pressure of 328 Bar, the product displayed a Short Mold defect despite a slight increase in mass. At 75℃ with an increased injection pressure of 928 Bar, a White Line defect was observed, while at 85℃ and 928 Bar, a defect-free part was produced with optimal mass. However, at 95℃, a Bright Color defect was evident, leading to part rejection despite a slight mass increase. The findings highlight the significance of meticulous parameter selection, with an optimal combination identified as 85℃ hot water temperature and 928 Bar injection pressure for defect-free production in injection molding processes. 
Experimental study: coolant viscosity's impact on Inconel 600's surface roughness measured using a refractometer Pujo Leksonowati, Nur Fitria; Pamungkas, Nurman; Manurung, Meilani Mandalena; Batubara, Ninda Hardina; Widiastuti, Hanifah
Journal of Engineering and Applied Technology Vol. 5 No. 1 (2024): (March)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jeatech.v5i1.71254

Abstract

This paper presents an experimental study on the impact of coolant viscosity on the surface roughness of Inconel 600 material processed using a lathe. This research employs sequential experimental methods, encompassing a coolant viscosity test, specimen machining with a lathe, and surface roughness test. The standard for the roughness grade number is defined by ISO 1302. The study effectively demonstrates the use of a refractometer as a reliable and practical alternative for determining coolant quality in % Brix units, which strongly correlates with coolant viscosity. The research findings reveal that an increase in coolant viscosity results in a smoother surface roughness of the workpiece, while a decrease leads to an increase in surface roughness. Specifically, the average viscosity of 8%, 10%, and 13% Brix coolant results in an average surface roughness of Ra 11.83 μm, Ra 10.09 μm, and Ra 7.23 μm, respectively. The average roughness grade number based on this study is N9 - N10. However, the study also identifies the need for further mathematical calculations to establish a link between coolant concentration, % Brix, and coolant viscosity. This opens up an intriguing avenue for future research and holds the potential to significantly enhance our understanding of the relationship between these variables.
Studi Keausan Mata Pahat Pada Proses Pembubutan Material ST 37 Manurung, Meilani Mandhalena; Leksonowati, Nur Fitria Pujo; Saputra, Agung; Pamungkas, Nurman; Stefani, Windy; Batubara, Ninda Hardina; Purba, Adi Syahputra; Muvariz, Mufti Fathonah
Jurnal Teknologi dan Riset Terapan (JATRA) Vol. 6 No. 1 (2024): Jurnal Teknologi dan Riset Terapan (JATRA) - June 2024
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v6i1.7418

Abstract

Penelitian ini bertujuan untuk membandingkan tingkat keausan pada tiga jenis pahat insert bubut, yaitu CNMG120408-NM4 WPP20, CNMG432-MS3, dan CNMG 150604r-k 4325, dalam kondisi pemotongan yang identik. Variabel kedalaman potongan dan kecepatan spindle ditetapkan pada 1,0 mm dan 560 rpm, dengan material yang digunakan adalah besi ST 37. Hasil menunjukkan bahwa CNMG 150604r-k 4325 mengalami kehilangan massa paling besar, sedangkan CNMG120408-NM4 WPP20 menunjukkan keausan paling rendah. Faktor-faktor yang mempengaruhi keausan ini meliputi gesekan, temperatur tinggi, kecepatan potong, material yang diproses, dan kondisi pemotongan. Penelitian ini memberikan highlight tentang faktor-faktor yang mempengaruhi keausan pada pahat insert bubut sehingga dapat dijadikan referensi untuk pemilihan pahat yang tepat untuk meningkatkan efisiensi proses permesinan
Studi Kasus Penjadwalan Proyek: Frame Acid Skid dengan Gant Chart dan Critical Path Method Pujo Leksonowati, Nur Fitria; Pamungkas, Nurman; Stefani, Windy; Purba, Adi Syahputra; Manurung, Meilani Mandhalena; Batubara, Ninda Hardina; Gunawan, Leo Van
Journal of Applied Mechanical Technology Vol 3 No 1 (2024): Journal of Applied Mechanical Technology (JAMET)
Publisher : Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/journalofappliedmechanicaltechnology.v3i1.53

Abstract

This study examines the scheduling of the Frame Acid Skid project at the Lombok Steam Power Plant (PLTU) using Gantt Chart and Critical Path Method (CPM). The primary objective is to identify the causes of delays and propose optimization measures for the project duration. Data collected indicates a significant difference between the planned duration (24 days) and the actual project completion time (47 days). The main delays occurred in the welding and painting phases, each requiring an additional 13 days. Contributing factors include the addition of a welding process for materials not covered in the initial contract and specification mismatches in the painting phase. Analysis with Gantt Chart and CPM reveals that enhanced communication, more detailed initial planning, and strict monitoring of project specifications are crucial to minimize the impact of delays on cost and time. The results of this study provide a strong basis for decision-making in similar future projects.
STUDI PERHITUNGAN DAN IMPLEMENTASI AIRBAG PADA PELUNCURAN KAPAL TONGKANG 330 FEET BERDASARKAN STANDAR CB/T 3837-1998 Dzulfiqar, Mohamad Alif; Pujo, Nur Fitri; Pamungkas, Nurman; Husen; Mufariz, Mufti Fathonah; Fadhilah, Nurul
J-ENSITEC Vol. 11 No. 01 (2024): December 2024
Publisher : Universitas Majalengka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31949/jensitec.v11i01.11541

Abstract

Ship launching is a crucial stage in shipbuilding, and the airbag launching method has become widely adopted due to its flexibility, cost efficiency, and better safety compared to conventional methods. The ship launching stage is a crucial part of the ship's transition from land to sea, representing a significant innovation in the maritime field. Among the various methods available, the use of airbags has become one of the most effective and widely applied techniques. The approach taken is a quantitative approach to ensure accurate calculations in the process of launching ships using airbags. The quantitative approach aims at calculating the right number and distance between airbags to ensure the safety and efficiency of ship launching, in accordance with the industry standard C/B T 3837-1998. CB/T 3837-1998 standard can be applied to ensure stability and safety during the launching process, as well as minimize the risk of damage to the ship and ensure the launching process runs smoothly. This research aims to calculate the number and distance between airbags used in the launching of a 330-foot barge. The main ship dimensions and airbag specifications were obtained through field interviews to support accurate calculations. The results show that 18 airbags are required, with a distance between airbags ranging from 6.66 to 11.78 meters using a crossover arrangement configuration. This calculation is based on the main dimensions of the ship and the specifications of the airbags used. T
STUDI KOMPARATIF PENGGUNAAN YOKE AC DAN DC UNTUK DETEKSI CACAT SUBSURFACE PADA MATERIAL BERLAPIS CAT Leksonowati, Nur Fitria Pujo; Pamungkas, Nurman; Mufariz, Mufti Fathonah; Purba, Adi Syahputra; Manurung, Meilani Mandhalena; Stefani, Windy; Batubara, Ninda Hardina; Dupan, Pandi
Jurnal Teknologi dan Riset Terapan (JATRA) Vol. 7 No. 1 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - June 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i1.8565

Abstract

Penelitian ini bertujuan untuk mengevaluasi perbandingan efektivitas yoke AC dan yoke DC dalam mendeteksi cacat bawah permukaan (subsurface defect) pada pelat baja karbon A36 yang dilapisi cat dengan ketebalan bervariasi menggunakan metode Magnetic Particle Inspection (MPI). Lima spesimen baja dengan ketebalan lapisan cat 100, 200, 300, 400, dan 500 mikron diuji. Metode visible wet particle diterapkan setelah kalibrasi yoke AC dan DC sesuai standar BS 6072. Hasil penelitian menunjukkan bahwa pada ketebalan cat 100 mikron, yoke AC mendeteksi 93% cacat, sedangkan yoke DC mendeteksi 98%. Seiring dengan meningkatnya ketebalan cat, performa yoke AC menurun drastis, terutama pada ketebalan 500 mikron, di mana yoke AC hanya mampu mendeteksi 38% cacat, sementara yoke DC masih mampu mendeteksi 43%. Dengan demikian, yoke DC lebih efektif dalam mendeteksi cacat bawah permukaan pada spesimen dengan lapisan cat yang lebih tebal dibandingkan yoke AC.
IDENTIFIKASI FAKTOR KERUSAKAN MESIN BUBUT DI LABORATORIUM MANUFAKTUR MENGGUNAKAN METODE FAILURE MODE AND EFFECT ANALYSIS (FMEA): Studi Kasus: Laboratorium Manufaktur Politeknik Negeri Batam Mutiarani , Mutiarani; Gianluca Fenta, Sandro; Pamungkas, Nurman; Aryswan, Adhe; Giat Juangsa Putra, Lalu
Jurnal Teknologi dan Riset Terapan (JATRA) Vol. 7 No. 1 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - June 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i1.9257

Abstract

Dalam kegiatan praktikum di Laboratorium Manufaktur Politeknik Negeri Batam terdapat beberapa mesin bubut konvensional yang beroperasi. Namun dalam pengoperasinnya, terkadang terjadi masalah dengan proses produksi karena kerusakan mesin yang signifikan sehingga menyebabkan proses belajar menjadi terganggu. Tujuan studi ini adalah untuk mengidentifikasi komponen utama penyebab kerusakan pada salah satu mesin bubut konvensional dengan menggunakan metode Failure Mode and Effect Analysis (FMEA) dengan cara menghitung Risk Priority Number (RPN) dan memberikan rekomendasi. Dengan menghitung nilai RPN dapat diidentifikasi risiko kerusakan tertinggi dari komponen mesin bubut tersebut sehingga prioritas perawatan yang dibutuhkan dapat diketahui. Berdasarkan analisis, nilai RPN terbesar diperoleh sebesar 192 oleh gearbox mesin bubut, kemudian eretan pemutar sumbu x sebesar 36 dan kopling transmisi roda gigi sebesar 32. Karena seluruh komponen tersebut memiliki nilai RPN < 200, maka mitigasi risiko yang perlu dilakukan adalah dengan melakukan corrective maintenance namun untuk mencegah kerusakan mesin bubut sebelum terjadi dan memperkecil risiko gangguan pada praktikum, diperlukan peningkatan strategi yang lebih tepat pada preventive dan predictive maintenance.  
Pengaruh Proses Tacking dan Welding Sequence Terhadap Distorsi Pada Pengelasan Butt Joint Pipa Dengan Flange Berbahan Carbon Steel Pamungkas, Nurman; Leksonowati, Nur Fitria Pujo; Mufariz, Mufti Fathonah; Hakim, Rahman; Baharudin, Budi; Dzulfiqar, Mohamad Alif; Saputra, Ihsan; Aryswan, Adhe; Reynaldi, Muhammad Ryan
Jurnal Teknologi dan Riset Terapan (JATRA) Vol. 5 No. 2 (2023): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2023
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v5i2.6893

Abstract

This research explores the issue of distortion in spool pipes within the context of the fabrication process, with a specific focus on pipe connections with flanges. The main objective of this study is to investigate the impact of distortion caused by the tacking process during fit-up and the sequence of welding sequences in the welding process. The experiments were conducted by collecting data through inspections of concentricity in the connections using the Total Station Sokkia CX 101 S/N GP1159 tool, with tolerances set at 1, and 0.75 for capping weld. Fabrication Piping and Structure Onshore served as the testing location, with ASTM A671 CC60-12 as the testing material. All tests were conducted at room temperature. The inspection results were used as a guide for the repair process, providing instructions to the Fitter for improving the connections and enabling the welder to maintain the precision of the pipe connections with flanges to avoid distortion. Based on the experimental results, the concentricity of pipe connections reflects the occurring distortion, while welding sequences show a counter effect at each welding step. The distortion after welding, measured at 0.75, still complies with client specifications.
​​Pengaruh G96 dan G97 terhadap Kekasaran Permukaan ST 37 dan S45C pada Pembubutan CNC​ pujo leksonowati, nur fitria; Pamungkas, Nurman; Baharudin, Budi; Cahyagi, Danang; Van Gunawan, Leo; Adimas, Adimas
Journal of Applied Mechanical Technology Vol 4 No 1 (2025): JOURNAL OF APPLIED MECHANICAL TECHNOLOGY (JAMET)
Publisher : Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/journalofappliedmechanicaltechnology.v4i1.308

Abstract

ABSTRACT – This study aims to compare the effects of Constant Cutting Speed (G96) and Constant Spindle Speed (G97) modes on the surface roughness of ST 37 and S45C materials in step-turning processes using a CNC lathe. A comparative experimental method was employed, measuring surface roughness (( R_a )) at stepped diameters (16 mm, 24 mm, 32 mm, and 35 mm) with a Mitutoyo Surface Tester SJ-210. Results indicate that G96 mode produces lower surface roughness, with average ( R_a ) values of 2.22 µm (S45C) and 2.27 µm (ST 37) in the N6 class, compared to G97 mode with ( R_a ) values of 3.08 µm (S45C) and 3.03 µm (ST 37) in the N7 class. G96 mode is superior due to its ability to automatically adjust rotational speed based on diameter, whereas in G97 mode, small diameters with high rotation (1273 rpm) increase roughness due to vibration or heat. This study recommends using G96 mode for optimal surface smoothness in step-turning of similar materials. rning of similar materials.
Co-Authors Adhe Aryswan Adimas, Adimas Agung Saputra Ali, Sulaiman Ari Wibowo Arif, Zainal Ariyanto, Nugroho Pratomo Baharudin, Budi Batubara, Ninda Batubara, Ninda Hardina Budiman Budiman Butar, Hendra Butar Cahyagi, Danang Cahyo Budi Nugroho Dimas Prasetyo Dupan, Pandi Dzulfikar, Mohamad Alif Dzulfiqar, Mohamad Alif Fajrin, Aulia Fyona, Annisa Gemala, Mega Gianluca Fenta, Sandro Giat Juangsa Putra, Lalu Hendra Saputra Husen Irawan, Benny Haddli Jayawarsa, A.A. Ketut Juangsa Putra, Lalu Giat Kamsyah, Domi Khollilurrahman, Kholillurrahman Leksonowati, Nur Fitria Leksonowati, Nur Fitria Pujo Leo Van Gunawan Manurung, Meilani Manurung, Meilani Mandalena Manurung, Meilani Mandhalena Mufariz, Mufti Fathonah Mutiarani , Mutiarani Mutiarani Mutiarani Muvariz, Mufti Fathonah Nidia Yuniarsih Nurul Fadhilah Nurul Laili Arifin, Nurul Laili Pujo Leksonowati, Nur Fitria Pujo, Nur Fitri Purba, Adi Purba, Adi Syahputra Puspita, Roza Rahman Hakim Restu, Fedia Reynaldi, Muhammad Ryan Rosbandrio, Wowo Saputra, Ihsan Siregar, James Sriyanto Sriyanto Stefani, Windy Surawan, Surawan Syafii, Muhamad Ulfah, Nurul Widiastuti, Hanifah Widodo Widodo Widodo, Syamsul Bahri Wijayanti, Ita