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All Journal SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Jurnal Inotera Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vocatech : Vocational Education and Technology Journal Jurnal Vokasi Jurnal Teknologi dan Riset Terapan (JATRA) Jurnal Surya Teknika J-Innovation Communio: Jurnal Pengabdian kepada Masyarakat Journal Of Artificial Intelligence And Software Engineering Jurnal KALANDRA Jurnal Mesin Sains Terapan Jurnal Teknologi dan Otomasi
Mahmud
Politeknik Negeri Lhokseumawe
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Acoustic Analysis of 3D Printing Motion Patterns for Machine Condition Monitoring Mahmud Mahmud; M. Dirhamsyah; Muhammad Rizal; Hamdani Hamdani; Azwar Azwar; Sariyusda Sariyusda; Zulfadli Zulfadli
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 19 No. 2 (2025): SINTEK JURNAL
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.19.2.113-131

Abstract

In additive manufacturing, mechanical vibrations generated during the printing process produce characteristic acoustic emissions, which are directly influenced by toolpath kinematics. These vibrations can adversely affect dimensional accuracy and interlayer adhesion, underscoring the need for effective process monitoring. This study investigates the correlation between specific toolpath geometries and their acoustic signatures in a Fused Deposition Modeling (FDM) 3D printer to establish a foundation for non-invasive condition monitoring. Five fundamental motion patterns—diagonal (Quadrants I-III and II-IV), horizontal, cylindrical, and vertical—were fabricated in an anechoic chamber. Acoustic emissions were captured via two microphones positioned 5 cm from the printer and analyzed in the time domain using statistical features: Root Mean Square (RMS), Kurtosis, and Crest Factor. The measured sound pressure levels ranged from 0.5 Pa to 1.5 Pa. Results indicate that the vertical toolpath yielded the lowest RMS (0.0863) and Crest Factor (5.38) values, reflecting the least intense and most stable acoustic emission. Conversely, diagonal patterns exhibited significantly higher values, denoting greater vibrational energy and transient fluctuations. These findings demonstrate a definitive influence of motion geometry on a printer's acoustic signature. The vertical pattern is identified as the most stable under the tested parameters. This research confirms that time-domain acoustic analysis is a viable technique for characterizing machine performance. Establishing this baseline correlation enables the future development of real-time, sound-based monitoring systems capable of predicting print defects and facilitating predictive maintenance, thereby enhancing the reliability and quality of additive manufacturing processes.
Peningkatan Keterampilan Vokasional Melalui Pelatihan Pengelasan Fabrikasi Meja dan Kursi Bagi Siswa SMK Negeri 2 Banda Aceh Rachmad Ikhsan; Zulfadli Zulfadli; Rizki Faulianur; Zoel Fachri; Inzar Salfikar; Rouhillah Rouhillah; Zakwansyah Zakwansyah; Mahmud Mahmud
Jurnal Vokasi Vol 10, No 2 (2026): Juli
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/vokasi.v10i2.10011

Abstract

Keterampilan praktik pengelasan merupakan salah satu kompetensi penting bagi siswa Sekolah Menengah Kejuruan (SMK) sebagai bekal memasuki dunia kerja, khususnya pada bidang manufaktur dan konstruksi. Kegiatan Pengabdian kepada Masyarakat (PkM) ini bertujuan meningkatkan keterampilan vokasional siswa SMK Negeri 2 Banda Aceh melalui pelatihan pengelasan dan fabrikasi meja serta kursi berbahan besi hollow. Kegiatan dilaksanakan selama dua hari, pada tanggal 25 s/d 26 Juni 2026, dengan melibatkan sekitar 20 siswa. Metode pelaksanaan meliputi pemberian materi dasar pengelasan, prosedur penggunaan peralatan, penerapan Keselamatan dan Kesehatan Kerja (K3), diskusi, demonstrasi, serta praktik langsung secara berkelompok. Tahapan praktik mencakup membaca gambar kerja, mengukur dan menandai material, pemotongan, perakitan, pengelasan, penggerindaan, finishing, serta pemeriksaan kualitas produk. Hasil kegiatan menunjukkan bahwa seluruh kelompok mampu menyelesaikan rangka meja dan kursi sesuai gambar kerja dengan konstruksi yang kokoh dan dimensi yang sesuai rancangan. Penilaian berdasarkan ketepatan ukuran, kualitas pengelasan, finishing, penerapan K3, dan kerja sama tim menghasilkan nilai akhir antara 88,6 s/d 95,4 dengan kategori sangat baik. Kegiatan ini memberikan pengalaman praktik secara nyata serta memperkuat keterampilan teknis, kedisiplinan, kerja sama, dan penerapan K3 bagi peserta
EFEKTIFITAS PELATIHAN JUNIOR GRAPHIC DESIGN DALAM PROGRAM VOCATIONAL SCHOOL GRADUATE ACADEMY BEASISWA TALENTA DIGITAL KOMINFO TAHUN 2024 Mahmud; Rizki Faulianur; Hilmi; Muhammad Azzahari
Jurnal Teknologi dan Otomasi Vol. 1 No. 1 (2025): Jurnal Teknologi dan Otomasi Juni 2025
Publisher : LLDIKTI WILAYAH XIII

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Abstract

ABSTRAK Penelitian ini mengkaji efektifitas program pelatihan Junior Graphic Designer di Politeknik Aceh sebagai bagian dari Vocational School Graduate Academy Beasiswa Talenta Digital Tahun 2024. Penelitian ini berfokus pada peningkatan kompetensi lulusan vokasi. Metode penelitian mencakup pengumpulan data berdasarkan indikator efektivitas program, termasuk pencapaian tujuan, kualitas materi, metodologi pengajaran, umpan balik peserta, tindak lanjut, dan rencana jangka panjang. Hasil penelitian menunjukkan bahwa pelatihan berhasil secara efektif meningkatkan keterampilan peserta secara signifikan dan relevan dengan perkembangan industri. Dukungan tindak lanjut juga membantu transisi peserta ke dunia kerja. Disarankan agar program pelatihan terus dilakukan pembaharuan agar tetap sejalan dengan tren industri terbaru, serta menambahkan elemen yang memperkuat jaringan profesional. Kata kunci: Junior Graphic Design, Pelatihan, Kompetensi, Talenta Digital
Optimasi desain struktur octagonal ring dynamometer menggunakan pendekatan parametric modeling berbasis makro untuk pengukuran gaya potong CNC milling Ilham Surya; Bukhari Bukhari; Mahmud Mahmud
Jurnal Mesin Sains Terapan Vol 10, No 2 (2026): JURNAL MESIN SAINS TERAPAN
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jmst.v10i2.10472

Abstract

A dynamometer is an instrument used to directly measure the cutting force generated during a CNC milling process. Politeknik Negeri Lhokseumawe currently does not have a dynamometer to support laboratory practice and cutting-force research, so the development of an economical octagonal-ring-based dynamometer structure is required. This study applies parametric modeling based on Visual Basic for Applications (VBA) macros in SolidWorks to automate dimensional variation of the octagonal ring, and analyzes the effect of geometric variation on sensitivity, stress, factor of safety, stiffness, and natural frequency using Finite Element Analysis (FEA). Three geometric parameters were varied—side length (l), ring thickness (t), and ring width (b)—across seven dimensional combinations, each tested under fifteen loading scenarios (Fx, Fy, Fz at five points), producing 105 simulations. The VBA macro successfully automated parameter updates, model rebuilding, and simulation execution without manual intervention. Variation V1 produced the highest sensitivity but FOS 1, whereas variation V4 (l = 18 mm, t = 4 mm, b = 18 mm) was selected as the optimal design, increasing average sensitivity by 20% (Fx), 26.67% (Fy), and 35.29% (Fz) compared with the initial design, while maintaining a minimum factor of safety above 2 and a natural frequency of 130.49 Hz. This optimal design can serve as a reference for developing a physical dynamometer to support CNC milling machining practice and research
Analisa pengaruh variasi kecepatan potong dan kedalaman pemakanan pada proses bubut baja St.42 terhadap kekasaran permukaan Sumardi Sumardi; Mahmud Mahmud; Saifuddin Saifuddin
Jurnal Mesin Sains Terapan Vol 10, No 2 (2026): JURNAL MESIN SAINS TERAPAN
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jmst.v10i2.10464

Abstract

The surface quality of lathe-machined workpieces is primarily governed by three cutting parameters: spindle speed, feed rate, and depth of cut, as the resulting surface roughness directly determines the functional quality of the machined component. Empirical observations indicate that achieving a favourable surface roughness in the turning process depends on the appropriate selection of cutting tool parameters, since the cutting tool constitutes one of the principal elements of the turning system alongside the machine tool and the workpiece itself, and exerts a significant influence on the resulting surface finish. This study aims to determine the surface roughness values and roughness grades of St.42 steel under varying spindle speeds and depths of cut during the turning process. Experiments were performed using a PL-1000 G lathe machine with ST 42 steel specimens, and surface roughness was measured using a Mitutoyo SJ-310 roughness tester. The results indicate that the optimum surface roughness value (Ra) at a spindle speed of 1020 rpm and a depth of cut of 0.2 mm was 3.573 µm, corresponding to roughness grade N8. At a spindle speed of 1800 rpm and a depth of cut of 0.4 mm, the optimum Ra value was 1.678 µm, corresponding to roughness grade N7. Meanwhile, at a spindle speed of 550 rpm and a depth of cut of 0.2 mm, the Ra value obtained was 3.925 µm, corresponding to roughness grade N8. Overall, the average surface roughness values obtained, in terms of Ra and roughness grade (N7 and N8), indicate that the machined surfaces fall within the fine-finish category for the turning process.
Co-Authors Abu Bakar Ja’far Amalia Harmin Aswar Aswar Azwar Azwar Azwar Azwar Yunus Azzahari, Muhammad Bukhari Bukhari Bukhari Kasim Devi Mulya Sari Dirhamsyah, Muhammad Elfisa Febrianton, Adi Feri Susilwati Gunawan, Bakti Hamdani Hamdani Hamdani Hamdani, Hamdani Hilmi Hilmi Hilmi Ibnu Khaldun Ichsan Ichsan Ilham Surya M. Dirhamsyah M. Dirhamsyah M. Dirhamsyah Mhd Ridho Pratama Mizanul Ahkam Muhammad Azzahari Muhammad Dirhamsyah Muhammad Razi Muhammad Rizal Muhibuddin Muhibuddin, Muhibuddin Munzir Umran Nurdan Nurdan Rachmad Ikhsan Ramadhani Rizki Faulianur Rizki Faulianur Rouhillah Rouhillah Rozaliana Rozaliana RumintoSubekti Safwan, Safwan Saifuddin Saifuddin Salfikar, Inzar Samsul Bahri Sariyusda Sariyusda Sariyusda Sinaga, Jufri Suharyadi Pancono Sumardi Sumardi Zakwansyah Zoel Fachri Zulfadli