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Tumpal Ojahan Rajagukguk
Universitas Malahayati
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Perancangan alat pemotong kayu dengan dua mata pisau menggunakan dinamo sebagai mesin penggerak yang multifungsi M Miko Mizar; Asnawi Lubis; Tumpal Ojahan Rajagukguk
Jurnal Teknik Mesin Indonesia Vol. 17 No. 2 (2022): 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.v17i2.379

Abstract

Technology continues to develop all the time along with the progress of the times, in addition to facilitating human work, the use of machines is very helpful in increasing productivity in a relatively faster time, including wood processing craftsmen in Indonesia. To make it easier for wood craftsmen, a modern saw machine is needed so that it is hoped that the demand from the community can be met. This study aims to design a wood cutting tool and find out how long it takes to cut wood with a thickness of 0.75 cm, 1.75 cm, 2.75 cm and 3.75 cm, and a cutting width of 3 cm. The design of this multifunctional tool uses cutting blades and an AC 220 V – 180 watt dynamo as a driving machine. The result of the design is shaped like a table with two blades that can be used interchangeably, and there is sandpaper on the front that functions as a smoothing part of the cut wood. This tool has a height of 90 cm, a width of 50 cm, a length of 70 cm, and the height of the top blade holder is 15 cm, and the top blade holder is 60 cm long, the sandpaper holder is on the front side. This tool is able to cut the type of wood medang aged approximately 15 years in the form of blocks with a thickness of 0.75 cm in 2.51 seconds, 1.75 cm 3.72 seconds, 2.75 cm in 6.27 seconds, and 3. 75 cm with 8.70 seconds average time.
Pengaruh fraksi massa dan ukuran butir basalt terhadap sifat mekanik komposit hibrid serat rotan Bely Agusti; Tumpal Ojahan Rajagukguk; Slamet Sumardi; Yusup Hendronursito
Jurnal Teknik Mesin Indonesia Vol. 17 No. 2 (2022): 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.v17i2.380

Abstract

Composite is a material that continues to be developed because of its advantages as an engineering material. With its diverse geographical environment, Indonesia has resources that can use as a composite material, and Lampung Province is no exception, which has basalt and rattan fiber resources. This research is needed to determine the effect of using basalt powder as a filler and rattan fiber as a polyester resin matrix composite reinforcement. Basalt was reduced to size variations of 100, 200, and 325 mesh with 2%, 7%, and 12% mass fractions. Rattan is made into fiber and washed with 5% NaOH, then dried. Rattan fibers were arranged randomly with a fixed mass fraction of rattan at 10% with a fiber size of 2 mm in diameter and 5 cm in length. SHCP 2668 polyester resin matrix with 2% catalyst. The composite was made using the hand lay-up method by pressing 3 tons for 15 minutes and drying the composite. Mechanical testing includes tensile strength test based on ASTM D638 standard and three-point bending test based on ASTM D790, macro test observations to determine the shape of the fracture after mechanical testing. ANOVA analysis showed the significant effect of mass fraction and size of basalt powder on tensile strength with a P-value <5%. The basalt particle size contributed 84% dominantly, while the mass fraction was 15.6% to the tensile sterngth. The grain size of the basalt contributes 62.13% to the flexural strength with a significant effect of P-value <10%. In flexural strength, rattan fiber has more influence than tensile stress. The small grain size of the basalt provides a denser bonding density between the particles than the larger particles. Resin can fill small cavities formed by small particles to make the composite board thicker and more robust.
Co-Authors Asnawi Lubis Bely Agusti M Miko Mizar Slamet Sumardi Yusup Hendronursito