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All Journal Journal of Science and Applicative Technology JAMETECH Logic : Jurnal Rancang Bangun Dan Teknologi
Risa Nurin Baiti
Jurusan Teknik Mesin Politeknik Negeri Bali, Jl. Kampus, Kuta Selatan, Badung Bali 80364, Indonesia
Automotive Engineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Perancangan mekanisme rel torch plasma cutting 1 (satu) Axis I Wayan Suma Wibawa; I Komang Kantun; I Ketut Suherman; Risa Nurin Baiti; I Wayan Suirya
Journal of Applied Mechanical Engineering and Green Technology Vol. 3 No. 1 (2022): March 2022
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (515.479 KB) | DOI: 10.31940/jametech.v3i1.8-12

Abstract

Plasma cutting is a method of cutting metal, especially steel, with relatively low cost and effectiveness, with satisfactory results. Where in the cut, it is enough to need a plasma cutting machine/inverter that is quite affordable, widely available in the market, and simple tools, an air compressor (no special oxygen/gas needed as in gas/oxygen and acetylene/LPG cutting), a power source, the material being cut and the cutting process can be carried out. How to use plasma cutting is relatively easy, namely by setting the machine and then directing the plasma torch to the cutting plane as needed by maintaining a stable movement and height. However, when we make repeated cuts, our concentration and physical strength will automatically decrease, so we need a tool that can help us direct/adjust the plasma torch, which is called a plasma cutting mechanism. After paying attention to these needs, a plasma cutting mechanism was designed with a working space/cutting length of 1200 mm, with a tool size of 1400 mm x 300mm x 200 mm length, width and height, estimated cost of Rp. 3,050,000,-, with a cutting speed setting of 100 mm/minute to 1000 mm/minute, a cutting height of 0 to 10 mm with an angle of 0 degree to 90 degree.
Evaluation of surface properties of betung bamboo (Dendrocalmus asper) strands under various heat treatment duration and temperature Risa Nurin Baiti; Sena Maulana; Wahyu Solafide Sipahutar; Rio Ardiansyah Murda; Fajar Aditya Julyatmojo; Astri Aulia Suwanda; Muhammad Saeful Fadlan
Journal of Science and Applicative Technology Vol 5 No 2 (2021): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i2.457

Abstract

The abundance, rapid growth characteristics and good mechanical properties have made betung bamboo as good alternative materials to replace the slow growing wood. To adress the susceptibility to insects and water attack, the making of bamboo composites, using resin as matrix, has been widely practiced. Thus, the surface properties of bamboo strands are crucial to determine the optimum interaction with resin. This study evaluate the effect of heat treatment to improve the surface properties of bamboo strands, such as the wettability and the color change. Beforehand, the freshly cut bamboo was cut, cleaned and sand-grinded. The heat treatment was done at 140o and 160oC for 1, 2, and 3 hours. After cooling down to room temperature, the contact angle of bamboo’s surface was measured by sessile drop methode. The wettability was indicated by constant of contact angle change rate, K. Besides, the change of color was also determined. After the experiments, it was obtained that the bamboo surface tends to be more hydrophobic and has darker color with longer duration of heat treatment. Higher temperature and longer duration of heat treatment can cause more evaporation of liquid inside bamboo and decrease hydrophilicity of the surface.
The Effect of Reinforcement Surface Treatment With Citric Acid on The Flexural and Hardness Properties of Epoxy/Wood Sawdust Composites Asana, I Wayan Padma Yogi; Baiti, Risa Nurin; Widantha, Komang Widhi
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 2 (2025): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i2.100-106

Abstract

This study investigates the effect of citric acid surface treatment on wood sawdust used as reinforcement in epoxy-based composites, with a focus on improving bending strength. Wood sawdust was subjected to surface modification using citric acid and sodium hydroxide (NaOH) under equivalent molar concentrations. Bending strength tests showed that both citric acid and NaOH treatments significantly improved mechanical performance compared to untreated samples, with average strengths of 33.83 MPa and 32.82 MPa, respectively, versus 21.83 MPa for the untreated group. Statistical analysis was conducted to compare the two treatments. After confirming normal distribution but unequal variances, a Welch two-sample t-test was performed, yielding a p-value of 0.742. This result indicates no statistically significant difference in bending strength between citric acid and NaOH treatments.
Co-Authors Asana, I Wayan Padma Yogi Astri Aulia Suwanda Fajar Aditya Julyatmojo I Ketut Suherman I Komang Kantun I Wayan Suirya I Wayan Suma Wibawa Muhammad Saeful Fadlan Rio Ardiansyah Murda Sena Maulana Sipahutar, Wahyu Solafide Widantha, Komang Widhi