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All Journal Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi
Zainal Sudirman
Akademi Komunitas Industri Manufaktur Bantaeng
Aerospace Engineering Automotive Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh Putaran Mesin Bubut Terhadap Kekasaran Permukaan Material Komposit Serat Rami Zainal Sudirman; Nur Asmi Rahmawati; Isnandar Isnandar
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 11, No 2 (2025): Oktober
Publisher : universitas teuku umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jmkn.v11i2.12817

Abstract

Penelitian ini bertujuan untuk menganalisis pengaruh variasi putaran mesin bubut terhadap kekasaran permukaan material komposit berbasis serat rami. Komposit dibuat dengan metode cetak menggunakan pipa PVC berdiameter 1 inci dan panjang 15 cm, dengan perbandingan volume antara serat dan resin yang telah ditentukan. Proses pembubutan dilakukan pada tiga variasi putaran spindel, yaitu 120 rpm, 660 rpm, dan 1100 rpm. Hasil pengukuran kekasaran permukaan menunjukkan bahwa peningkatan putaran spindel menyebabkan nilai kekasaran meningkat secara signifikan. Kekasaran permukaan terendah sebesar 19,22 µm diperoleh pada putaran 120 rpm, sedangkan nilai kekasaran tertinggi sebesar 37,73 µm terjadi pada putaran 1100 rpm. Hal ini mengindikasikan bahwa kecepatan putar tinggi meningkatkan gaya potong dan suhu kontak, yang dapat merusak struktur permukaan komposit. Dengan demikian, pemilihan parameter pemesinan yang tepat sangat diperlukan untuk menjaga kualitas permukaan komposit serat rami. Penelitian ini memberikan kontribusi terhadap optimasi proses pemesinan material komposit berbasis serat alam untuk aplikasi teknik dan industri ringan.  Kata kunci— komposit serat rami, kekasaran permukaan, putaran mesin bubut, permesinan komposit.
Evaluasi Sudut Potong Pahat Bubut terhadap Kekasaran Permukaan Poros Baja AISI 1045 Hasil Build-up Welding SMAW Zainal Sudirman; Laode Abdul Gamsir; Astuty Astuty; Rusdi Kaimuddin
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 12, No 2 (2026): Oktober
Publisher : universitas teuku umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jmkn.v12i2.16642

Abstract

Carried out through the build-up welding process, followed by turning to restore the component dimensions and surface quality. One of the challenges encountered is obtaining a smooth turned surface on materials that have undergone welding. Tool geometry, particularly the cutting angle, is one of the factors that may affect cutting forces, process stability, chip formation, and surface quality. This study aimed to evaluate and compare the surface roughness of an AISI 1045 steel shaft after SMAW build-up welding using three turning tool angle configurations, namely 65°, 75°, and 85°, under the applied cutting conditions. The experimental study used an AISI 1045 steel shaft with an initial diameter of 36 mm. The build-up welding process was performed using an RD-460 E6013 electrode with a diameter of 3.2 mm and a welding current of 116 A. Turning was carried out using a conventional lathe at a spindle speed of 225 rpm and a depth of cut of 2 mm. Surface roughness was measured using a Mitutoyo SJ-310 roughness tester, with two measurements taken for each configuration. The results showed that the average surface roughness values for tool angles of 85°, 75°, and 65° were 1.19 µm, 1.80 µm, and 7.46 µm, respectively. The lowest surface roughness was obtained at a tool angle of 85°, whereas the highest was recorded at 65°. These results indicate that the 85° tool angle produced the smoothest surface among the three angle configurations tested. Keywords— ST-45 steel, SMAW, build-up welding, lathe machine, cutting angle, surface roughness.
Co-Authors Astuty Astuty Isnandar Isnandar Laode Abdul Gamsir Nur Asmi Rahmawati Rusdi Kaimuddin