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All Journal Jurnal Rekayasa Mesin Journal of Applied Engineering and Technological Science (JAETS) Jurnal Polimesin
Ali Sai’in
Politeknik Negeri Semarang
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Effect of Moisture Content of Green Sand on The Casting Defects Nanang Qosim; AM Mufarrih; Ali Sai’in; A. Hanif Firdaus; Fina Andika F. A.; Ratna Monasari; Zakki F. Emzain
Journal of Applied Engineering and Technological Science (JAETS) Vol. 2 No. 1 (2020): Journal of Applied Engineering and Technological Science (JAETS)
Publisher : Yayasan Riset dan Pengembangan Intelektual (YRPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1469.666 KB) | DOI: 10.37385/jaets.v2i1.77

Abstract

In this study, three percentages of moisture content on the green sand were benchmarked to be observed their effects on the casting defects. The metal used is scrap Al-Si with wt% of Al 59.7. The metal was melted in a furnace at 550 ºC then poured into sand molds and cooled for 24 hours before it can be removed, cleaned, and finished. There were prepared three specimens for each benchmark. Qualitative observation of defects was done by physical observations on the surface of the specimens. The observations show that on the moisture content of 2.5%, there is a defect in the form of porosity. Defects in the form of drops, misruns, blowholes, and shrinkage cavity are found on the benchmark 3.5%. The most severe defects are found on the benchmark 4.5% in the form of buckles and severe shrinkage cavities that are found in almost all specimens.
Finite Element Analysis of Miniplate for Post-Fracture Finger Rehabilitation Device Nanang Qosim; Ratna Monasari; Zakki F. Emzain; Lutfi Hakim; Ali Sai’in
Journal of Applied Engineering and Technological Science (JAETS) Vol. 2 No. 1 (2020): Journal of Applied Engineering and Technological Science (JAETS)
Publisher : Yayasan Riset dan Pengembangan Intelektual (YRPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (560.062 KB) | DOI: 10.37385/jaets.v2i1.160

Abstract

Miniplate plays an important role as one of the implant components used as a rehabilitation device for a post-fracture finger. In this study, an analysis was carried out to determine the strength of the miniplate design made from Ti-6Al-4V titanium alloy material. Simulation and analysis were carried out using the finite element method. The given input for modeling tensile and bending loads determined von Mises stress, kinetic energy, strain energy, and internal energy. The analysis showed that uneven von Mises stress and strain distribution have occurred. The critical concentration of stresses was located at the center of the miniplate and these values were a lot lower than the yield stress of Ti-6Al-4V.
Investigasi Permukaan Besi Square Hollow Hasil Pengerollan menggunakan Teknologi Mesin Roller Bending Eko Saputra; Carli Carli; Hartono Hartono; Sunarto Sunarto; Ali Sai'in
Jurnal Rekayasa Mesin Vol 18, No 1 (2023): Volume 18, Nomor 1, April 2023
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v18i1.4382

Abstract

Industri skala kecil menengah saat ini masih banyak dijumpai menggunakan teknologi penunjang produksi secara manual menggunakan tenaga manusia, salah satunya adalah industri pembuat tralis atau rangka. Banyak industri kecil saat ini masih melakukan pengerolan besi dengan metode manual, dengan cara memotong sebagian (menyobek) square hollow. Metode manual ini menghasilkan kualitas pengerolan yang tidak rapi dan membutuhkan waktu yang cukup lama. Solusi yang dapat dilakukan agar kualitas pengerolan rapi adalah dengan mengeroll menggunakan mesin pengerol. Namun teknologi mesin roller juga memiliki keterbatasan radius pengerolan sehingga produk pengerolan tidak akurat. Indikator kualitas pengerolan adalah muncul tidaknya kerutan pada permukaan besi hasil pengerolan. Beberapa faktor penyebab ketidak akuratan tersebut adalah dimensi profil dan ketebalan besi square hollow yang bervariasi. Semakin kecil dimensi profile besi square hollow maka sulit dilakukan pengerolan. Berdasarkan survey literature, belum ditemukan investigasi pengaruh variasi radius terhadap kerutan pada permukan besi square hollow, padahal kualitas terbaik dari permukaan hasil pengerollan sangat disukai oleh pelanggan. Oleh karena itu, penelitian ini bertujuan untuk menginvestigasi kualitas besi square hollow akibat variasi radius pengerolan. Pengerolan dilakukan pada besi square hollow ukuran 20×20 mm dan 40×40 mm dengan variasi radius pengerolan yang dilakukan adalah 2000 mm, 1500 mm, 1000 mm, 750 mm, dan 500 mm. Hasil pengujian menggunakan square hollow ukuran 20×20 mm dan 40×40 mm menghasilkan radius pengerolan yang dapat dibuat paling kecil adalah 500 mm, dengan kondisi permukaan pada square hollow 20×20 mm yang masih bagus dan 40×40 mm sudah muncul kerutan.
Optimization of cutting current in CNC plasma cutting for improved bracket fabrication quality Ali Sai'in; Venditias Yudha; Luqman Al Huda; Zaenal Abidin; Hartanto Prawibowo
Jurnal Polimesin Vol 24, No 2 (2026): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i2.8618

Abstract

CNC plasma cutting is widely used in metal fabrication due to its efficiency and versatility; however, parameter optimization is essential to ensure high-quality results. This study investigates the influence of CNC plasma cutting parameters affect the fabrication quality of Revo motorcycle brackets, which are essential for electric motor vehicle conversion. We conducted experiments on 6 mm thick low-carbon steel plates using a JIAXIN JX-1530 machine. The electric current was varied at 50, 52, 54, and 56 A. For each current level, four specimens were prepared and tested while keeping other parameters constant: a cutting speed of 600 mm/min, a gas pressure of 6 bar, and a torch distance of 1–2 mm. We assessed cut quality based on surface roughness (Ra) at two measurement points, dimensional accuracy relative to CAD design, and hardness variations in the Heat-Affected Zone (HAZ) and base material. The results showed that the best conditions were achieved at 50 A, 6 bar gas pressure, and a torch distance of 2 mm, resulting in an average Ra of 5.39 µm and a dimensional deviation of ±0.3 mm. Although increasing the current above 50 A improved HAZ hardness, it negatively impacted surface roughness and increased the risk of thermal defects. These findings indicate that the identified optimal parameters support the production of high-precision, cost-effective brackets.
Co-Authors A. Hanif Firdaus AM Mufarrih Carli Carli Eko Saputra Fina Andika F. A. Hartanto Prawibowo Hartono Hartono Luqman Al Huda Lutfi Hakim Nanang Qosim Ratna Monasari Sunarto Sunarto Venditias Yudha Zaenal Abidin Zakki Fuadi Emzain