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All Journal Manutech : Jurnal Teknologi Manufaktur
Husman Husman
politeknik manufaktur negeri bangka belitung
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Optimasi Parameter Pemesinan CNC Turning Terhadap Kekasaran Permukaan Benda Kerja Material ST 42 Menggunakan Response Surface Methodology Prabowo Agung Pribadi; Yudi Oktriadi; Husman Husman
Manutech : Jurnal Teknologi Manufaktur Vol. 18 No. 01 (2026): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/manutech.v18i01.677

Abstract

Product quality is a critical aspect for producers in the manufacturing industry. One such quality is the surface roughness of the resulting product. A minimal surface roughness indicates a superior CNC machining process. However, achieving minimal surface roughness requires an optimal combination of machining parameters. This study aims to identify the significant process variables and determine their optimal combination in the CNC machining of ST 42 steel to improve its surface roughness. The method employed was Response Surface Methodology (RSM) with a Box-Behnken design to analyze three variable factors: cutting speed (at levels of 110-140 m/min), feeding (at levels of 0.25-0.45 mm/rev), and depth of cut (at levels of 0.1-0.5 mm). The results demonstrated that all three factors have a significant influence on the product's surface roughness. The most optimal parameter combination to achieve the best surface roughness was found to be a cutting speed of 264,56 m/min, a feed rate of 0.25 mm/rev, and a depth of cut of 0.1 mm. With these settings, the predicted achievable surface roughness value is 0,16 ?m.
Pengaruh Alkalisasi NaOH Terhadap Kekuatan Tarik Biokomposit Serat Daun Pandan Alas dengan Matriks Resin Poliester BQTN Malvin Nurhidayat; Muhammad Subhan; Husman Husman; Yuliyanyo Yuliyanto
Manutech : Jurnal Teknologi Manufaktur Vol. 18 No. 01 (2026): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/manutech.v18i01.751

Abstract

Pandanus tectorius leaf fiber exhibits considerable potential as a natural reinforcement material for biocomposites owing to its high cellulose content and robust fibrous structure. This study aims to investigate the influence of NaOH alkalization treatment on the tensile strength of biocomposites fabricated from BQTN polyester resin reinforced with Pandanus tectorius fibers. The experimental parameters include NaOH concentration (0%, 5%, and 10%), immersion time (3 hours and 5 hours), and fiber volume fraction (10% and 15%). Tensile tests were conducted in accordance with ASTM D638 standards, and the data were analyzed using analysis of variance (ANOVA) and Pareto diagrams. The results revealed that the untreated composite exhibited the highest tensile strength, with an average value of 30.47 MPa at a 15% fiber volume fraction. Conversely, the alkali-treated specimens demonstrated a reduction in tensile strength with increasing NaOH concentration and immersion duration, reaching the lowest value of 19.60 MPa at 10% NaOH for 5 hours. ANOVA results indicated that fiber volume fraction had the most significant effect on mechanical performance, followed by NaOH concentration and immersion time. These findings suggest that the optimization of alkalization parameters is crucial to enhance fiber–matrix interfacial bonding without significantly compromising the overall mechanical properties of the composite.
Co-Authors Malvin Nurhidayat Muhammad Subhan Oktriadi, Yudi Prabowo Agung Pribadi Yuliyanyo Yuliyanto