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All Journal Jurnal Teknik Mesin Indonesia Integrated Mechanical Engineering Journal
Rachmad Hartono
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Aerospace Engineering Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Development of the profile cross-sectional model of lightweight steel structure to improve the value of stiffness Sugiharto Sugiharto; Rachmad Hartono; Bukti Tarigan
Jurnal Teknik Mesin Indonesia Vol 15 No 1 (2020): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v15i1.150

Abstract

Baja struktur ringan adalah baja profil yang dibentuk dari pelat baja tipis hasil pengerolan dingin sehingga profil baja tersebut berbobot ringan dan tipis. Kekuatan tarik baja struktur ringan memiliki nilai yang sama dengan dengan kekuatan tarik baja sejenis. Kekuatan struktur baja ditentukan oleh kekakuan dan fleksibilitas strukturnya. Kekakuan adalah gaya yang diperlukan untuk menghasilkan perpindahan, sedangkan fleksibilitas adalah defleksi yang dihasilkan oleh gaya yang diberikan. Defleksi yang terjadi pada suatu batang ditentukan oleh nilai inersia penampang batangnya. Kekuatan struktur yang disusun oleh baja profil struktur ringan, dibentuk dari tingkat kekakuan profil penyusunnya, semakin kaku profilnya maka akan semakin kuat struktur yang disusun oleh profil baja struktur ringan tersebut. Pada kajian ini akan diuraikan suatu proses penelitian untuk peningkatan nilai kekakuan pada profil baja struktur ringan dari bentuk dan ukuran profil menurut standar SNI-1729:2015. Peningkatan nilai kekakuan dilakukan dengan mengembangkan model dari bentuk penampang profilnya, peningkatan kekakuan ditinjau dari besar defleksi yang terjadi pada saat diberikan beban lenturan. Hasil analisis menunjukan pengembangan model penampang yang dilakukan pada profil baja struktur pada ketebalan pelat yang sama dapat menurunkan defleksi yang terjadi dibawah beban lentur yang sama.
The Development of Rotary Fixture on Laser Engraver Machine Rachmad Hartono; Demas Cahyadi Ningrat; Fahru Rozi; Farhan Ali Husaini
Integrated Mechanical Engineering Journal Vol. 3 No. 1 (2025): Integrated Mechanical Engineering Journal (IMEJOUR) Vol. 3 No. 1 Mei 2025
Publisher : Department of Mechanical Engineering, Faculty of Engineering and Computer Science, Universitas Global Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56904/imejour.v3i1.82

Abstract

In the Mechanical Engineering Laboratory of Pasundan University there is a laser engraver machine that is able to perform the gravir process on materials that have a flat surface. The laser engraver has the disadvantage of not being able to do the gravir process on cylindrical workpieces. To overcome this weakness, it is necessary to make a workpiece holder tool specifically for holding cylindrical workpieces. The purpose of this research is to improve the ability of the laser engraving machine, so a rotary fixture model is made on the laser engraver machine. The rotary fixture is directly connected to a stepper motor. The stepper motor is controlled by the axis controller on the laser engraving machine. The rotary fixture has been successfully made and has undergone a testing process. The letter gravir process produced on a cylindrical gravir surface with workpiece dimensions Ø66 mm with a workpiece thickness of 6 mm requires a power modulation of 250 and an engraving speed of 200 mm/min and produces gravir with a letter width of 16 mm, a letter height of 5.50 mm and a spacing distance of 9.50 mm stated with ideal results. In general, the rotary fixture has been successfully made and improves the performance of the laser engraver machine to perform the gravir process on cylindrical workpieces. From the test results it can be concluded that the rotary fixture mechanical sistem can be operated to gravir letters, names, and batik motifs. With the rotary fixture, it is hoped that craftsmen can increase creativity in carrying out the gravir process using laser engraver.
Co-Authors Demas Cahyadi Ningrat Fahru Rozi Farhan Ali Husaini Sugiharto Sugiharto Tarigan, Bukti