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All Journal Jurnal Inovasi Teknologi Manufaktur, Energi dan Otomotif Jurnal Polimesin
Ansor Salim Siregar
Politeknik Negeri Banyuwangi
Automotive Engineering Control & Systems Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Analisis Komparatif Efektivitas Pahat Variable Helix Angle (VHA) dan Normal Helix Angle (NHA) untuk Pengendalian Regenerative Chatter pada Pemesinan CNC Milling Stainless Steel 304 Venusa Abriandika; Ansor Salim Siregar; Agung Fauzi Hanafi; Indra Adi Saputra
Jurnal Inovasi Teknologi Manufaktur, Energi dan Otomotif Vol. 4 No. 1 (2025): Jurnal Inovasi Teknologi Manufaktur, Energi, dan Otomotif
Publisher : Politeknik Negeri Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57203/jinggo.v4i2.2026.1-8

Abstract

This study compares the effectiveness of Variable Helix Angle (VHA) and Normal Helix Angle (NHA) end mills in controlling regenerative chatter during CNC milling of stainless steel 304. Experiments were conducted across a range of cutting parameters, including cutting speed, feed per tooth, and axial depth of cut, using VHA and NHA tools with identical basic geometries except for the helix angle. Measurements were obtained for vibration signals using an accelerometer, machined surface roughness (Ra), and tool wear. Signal analyses, including Fast Fourier Transform (FFT) and Power Spectral Density (PSD), experimental construction of stability lobe diagrams, and statistical evaluation using ANOVA, were employed to assess the influence of helix angle on stability limits and surface quality. The results are expected to determine whether VHA tools offer significant improvements in chatter suppression and expand the stable cutting region compared to NHA tools, as well as their implications for productivity and tool life when machining SS304. The findings provide practical recommendations for selecting cutter geometry in industrial applications where regenerative chatter poses a critical challenge.
Structural strength analysis of a tourist minicar knuckle using finite element analysis Agung Fauzi Hanafi; Mega Lazuardi Umar; I Gusti Ngurah Agung Satria Prasetya Dharma Yudha; Ansor Salim Siregar
Jurnal Polimesin Vol 24, No 1 (2026): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i1.8194

Abstract

The design of components for vehicles used in tourist areas must be efficient, safe, and economical. The steering knuckle is a vital component in the vehicle's suspension and steering systems, playing a crucial role in transferring loads, connecting the wheel to the steering mechanism, and supporting braking components. This research aims to design, analyze, and fabricate a steering knuckle for a mini tourist car with a total mass of 300 kg using plain carbon steel. The design and strength analysis were evaluated using the open-source Finite Element Analysis (FEA) software PrePoMax to investigate stress distribution, deformation, and the factor of safety. The FEA results showed a maximum Von Mises stress of 86.27 MPa, well below the material's yield strength, a maximum deformation of 0.126 mm, and a minimum safety factor of 2.72, confirming a robust design. The component was designed to accommodate a 30204 tapered roller bearing. The fabrication process, encompassing cutting, machining, and welding, successfully produced a functional prototype validated through direct installation and load testing on the vehicle. This study confirms that plain carbon steel is a reliable and economical material for structural components in lightweight vehicle applications and provides a pragmatic engineering framework for developing cost-effective automotive components.
Co-Authors Hanafi, Agung Fauzi I Gusti Ngurah Agung Satria Prasetya Dharma Yudha Indra Adi Saputra Mega Lazuardi Umar Venusa Abriandika