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All Journal LONTAR Jurnal Teknik Mesin Undana (LJTMU )
Jack C.A. Pah
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Mechanical Engineering

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Karakteristik Pembakaran Difusi Campuran Solar Murni dengan Minyak Kelapa Jack C.A. Pah; Defmit B.N. Riwu; Adi Y. Tobe; Suprianto Siagian
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 7 No 01 (2020): April 2020
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v7i01.3379

Abstract

This research was conducted to determine the effect of adding coconut oil to pure diesel oil on the characteristics of diesel oil steam diffusion combustion. The characteristics observed are flame height and fire temperature. The combustion process is carried out on a circular tube burner. The steam mass flow of fuel in this study is 0.0895 grams / second. From the results of the study the biggest results were obtained in the mixture of 90% diesel oil with 10% coconut oil, fire height of 94.51 mm and a temperature of 967˚C and the lowest yield was found in a mixture of 70% diesel oil and 30% coconut oil, namely temperature amounting to 796˚C and fire height of 68.85 mm. From this, it can be concluded that the greater the percentage of diesel oil added to the combustion process, the higher and the flame temperature will increase. This is due to the characteristics of different fuels, where diesel oil has a lower viscosity than coconut oil and has a heating value greater than coconut oil.
Rancang Bangun Mesin Pemarut Batang Putak Vinsen Yuminto Bifel; Defmit B.N. Riwu; Jack C.A. Pah
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Putak is the name of a local feed on the island of Timor, East Nusa Tenggara which is obtained from the trunk of the gewang tree (Coypha gebanga). Most of the putak processing by the people of Timor Island is very low and also limited so that putak productivity is very low because people still do it traditionally and only use it as food. Therefore, this study aims to design a putak grater for animal feed. The VDI 2221 method is a design method that uses a systematic approach to design for engineering systems and engineering products. The effective capacity of the tool is obtained by grating / repeating 3 times, then the average effective capacity of the tool is calculated. In testing the putak sticks used to produce a grated mass volume of 3,5 kg, and a tool capacity of 70 kg/hour. The results showed that the effective capacity of the putak grating machine was 70 kg/hour.
Waktu Gesek Terhadap Kekuatan Tarik Sambungan AA6061-Baja Karbon Pada Pengelasan Gesek Continuous Drive Jack C.A. Pah; Defmit B.N. Riwu; Dominggus Adoe; Adi Y. Tobe
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 02 (2021): Oktober 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i02.5940

Abstract

The objective of this research was to get the effect of friction time on the tensile strength of the joining of aluminum alloy AA6061 and carbon steel, with continuous drive friction welding process. Variations of friction time of this research were 5 seconds, 7 seconds, 9 seconds, and 11 seconds. Other friction welding variables were friction pressure 24 MPa, forging pressure 79 MPa, forging time 60 seconds, and friction rotation speed 1600 rpm. The independent variable was the ultimate tensile strength of the welded joint. The results showed that the relationship between friction time and ultimate tensile strength is not linear, with the increase in friction time. The increasing of friction time, caused the ultimate tensile strength increase to a maximum value and then the ultimate tensile strength of the joint will decrease sharply. The greatest ultimate tensile strength is obtained at a friction time 9 seconds, with ultimate tensile strength 111.89 MPa
PERANCANGAN SISTEM INSTALASI PERPIPAAN IRIGASI PADA LAHAN BUDIDAYA TANAMAN HOLTIKULTURA Sam Rudian Rivaldo Fanggidae; Verdy A. Koehuan; Jack C.A. Pah
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 01 (2025): April 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i01.19928

Abstract

Penelitian ini dilakukan untuk perancangan sistem instalasi perpipaan irigasi tetes pada lahan pertanian budidaya tanaman hortikultura yang dilakukan pada lahan terbuka dengan ukuran 40x80 meter dengan Sumber air untuk penyiraman tanaman holtikutura pada lahan terbuka adalah bak penampung air dengan ukuran 12x8 meter. tujuan penelitian adalah untuk merancang sistem instalasi perpipaan pada jaringan irigasi tetes pada lahan pertanian budidaya tanaman hortikultura. Perancangna ini mengunakan metode perancangan, Metode perancangan dibutuhkan untuk memudahkan perancang untuk merancang dan mengembangkan rancangan. Tahapan-tahapan pada metode rancangan mulai dari pencarian ide rancangan kemudian mencari permasalahan dan tujuan dari rancangan itu. Perancangan system irigasi tetes ini menggunakan dua mode operasi yaitu system tower dan system pompa. System tower memompa air dari bak penampung ke tower kemudian di teruskan ke system jaringan secara bergilir ke masing-masing Jalur A, Jalur B dan Jalur C. Dari hasil analisis yang diperoleh untuk kebutuhan daya dengan menggunakan system tower yaitu 112,5025 W, Sedangkan system pompa tanpa melalui tower yang dapat dioperasikan secara bersamaan kesemua jalur maupun secara terpisah ke Jalur A , Jalur B dan Jalur C. Dari hasil analisis diperoleh kebutuhan daya pompa adalah 350 W Dengan total head 22 m.
HEAT TREATMENT PADA MATA PISAU ALAT PENGHANCUR ARANG BIOMASA UNTUK MENINGKATKAN NILAI KEKERASAAN DENGAN VARIASI TEMPERATUR Agustinus Otu; Jack C.A. Pah; Jahirwan Ut Jasron
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 02 (2025): Oktober 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i02.23211

Abstract

. This is evidenced by the large use of steel in various machine components, work materials and building construction, both in the form of plates, sheets, pipes and so on. Damage that often occurs in the application of ST 41 steel is wear. Wear occurs due to the influence of external forces in the form of friction and is the most dominant factor in damage to the function of machinery. As a result, the service life and performance of various machine components are reduced and indirectly will increase maintenance costs. The public demand for this metal hardening technology is increasing, so researchers have tried to apply knowledge about metal hardening to knives with low carbon steel materials. Heat treatment aims to increase ductility.. This study shows that Heat Treatment with different temperatures and different cooling media can significantly affect the hardness of low carbon steel. The results of the study showed that the highest hardness of low carbon steel was obtained at a temperature of 950°C with oil cooling media, which was 44.30 HRC.
Alat Penggorengan Abon Ikan Berpenggerak Motor Listrik 200 Watt Yohanes T. Luluk; Ishak S. Limbong; Jack C.A. Pah; Murni Pallawagau
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 02 (2025): Oktober 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i02.27056

Abstract

Fisheries play a crucial role in the Indonesian economy, particularly for fishermen and coastal communities. However, fishery products such as fish floss have problems in the frying process, which requires continuous human power to stir. This research aims to design and develop a fish floss frying device powered by an electric motor with a driving power of 200 W. This tool is expected to facilitate the fish floss frying process, reduce the energy expended by the fish floss maker, and increase the efficiency of the production process. This research uses data collection methods, tool design, and tool testing. Autodesk Inventor software was used in the design stage to design the tool frame, stirrer, and pan holder. This tool includes an electric motor, gearbox, pulley, V-belt, and frying pan. Then, the tool was made using a hollow iron box, a stainless-steel pipe, and wood. This research yields a fish floss fryer equipped with an electric motor, capable of frying fish floss with a capacity of up to 3 kg. This tool can help ease the work of frying fish floss, save labour, and increase production efficiency. With a driving power of 200 W, this tool can produce good-quality fish floss
Bangun dan Pengujian Alat Pencetak Briket Silinder dan Kubus Berlubang Tengah Menggunakan Variasi Putaran Jason Yuniando Willa Here; Jack C.A. Pah; Muhamad Jafri
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.19389

Abstract

The global energy crisis is driving the need for environmentally friendly alternative energy, one of which is biomass briquettes from coconut shells, rice husks and sawdust. This research designs and tests a biomass briquette printer based on an electric motor with variations in rotation to produce cylindrical and cube-shaped briquettes with a center hole. The tool design was created using SolidWorks, accompanied by stress, displacement and strain simulations, as well as testing at the Mechanical Engineering Laboratory, Nusa Cendana University, Kupang, NTT. The results show a maximum stress of 5.006 × 10⁴ MPa and a maximum displacement of 2.165 × 10⁻⁴ mm, proving the tool is quite strong. 17.3 rpm rotation produces 19 complete briquettes, showing the best efficiency compared to other variations. This tool is effective for supporting sustainable alternative energy production.
Rancang Bangun Mesin Penghancur Arang Biomassa Sebagai Bahan Baku Briket Dengan Penggerak Motor Bensin Arlindo Samuel Mata; Jahirwan Ut Jasron; Jack C.A. Pah
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.20173

Abstract

The community that utilizes biomass energy as an alternative material (briquettes) still manually uses wood or other hard objects as a crushing medium, but produces coarse and non-uniform charcoal granules which have an impact on the quality of the charcoal briquettes produced. The purpose of making this tool is to solve the problems in the briquette making process, by utilizing the rotation of a gasoline engine as a driver, this tool is also equipped with a sieve with the aim of obtaining uniform biomass charcoal results. The results of the study showed that within 55 seconds with a motor rotation of 1,440 Rpm as much as 1 kg of charcoal material can be crushed and get results as much as 0.9 kg of uniform biomass charcoal according to needs.
Analisis Kinerja Turbin Savonius Dengan Variasi Sudut Pengarah Aliran Air Pada Saluran Terbuka Bernabas Rivaldo Allung; Arifin Sanusi; Jack C.A. Pah
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.22490

Abstract

Indonesia has significant potential for hydropower development due to its mountainous and hilly topography, numerous rivers, and lakes/reservoirs that can be utilized as water energy sources. Water energy is harnessed for power generation using water turbines. One type of water turbine that can be used is a turbine with vertical or horizontal axis rotation, which can convert fluid energy into mechanical energy without requiring high head like other types of water turbines. One challenge is how to utilize the potential of relatively small water flow energy. Therefore, research is needed to transform constant water flow velocity to drive turbine or wheel shafts. The results show that the use of flow guide vanes on Savonius-type water turbines significantly affects turbine performance, with an average power coefficient increase of 5.80%. Additionally, the highest average power output of 3206.86% was obtained at a 45° deflector angle, which is higher compared to other angles such as 0°, 15°, 30°, and 60°.
Pengaruh Perlakuan Alkali Terhadap Wettability Serat Ijuk Aren (Arenga Pinata) Sefriano Muti Seran; Dominggus G. H. Adoe; Jack C.A. Pah
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 13 No 01 (2026): April 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v13i01.22798

Abstract

This study aims to analyze the effect of alkali treatment (NaOH) with variations in concentration (0%, 2%, 3%, 4%, dan 5%,) and soaking time 30, 60, 90, and 120 minutes on the wettability of palm fiber. Wettability measurements were carried out by observing the diameter of water droplets on the fiber surface. The results showed that the concentration of NaOH and soaking time had a significant effect on changes in droplet diameter. At a concentration of 0 without treatment, the droplet diameter reached 81.20 µm. At a concentration of 2%, the droplet diameter decreased to 40.01 µm 30 minutes, 38.84 µm 60 minutes, 42.57 µm 90 minutes, and 43.20 µm 120 minutes. The 3% concentration showed an inconsistent pattern with droplet diameters of 28.66 µm 30 min, 78.11 µm 60 min, 28.50 µm 90 min, and 66.21 µm 120 min. At a concentration of 4%, the droplet diameters varied between 41.37 µm and 74.61 µm. A concentration of 5% produced droplet diameters of 41.24 µm 30 min, 61.32 µm 60 min, 44.42 µm 90 min, and 60.65 µm 120 min. This study provides important insights into the optimization of alkali treatment for the application of palm fiber in composite materials.
Co-Authors Agustinus Otu Arifin Sanusi Arlindo Samuel Mata Bernabas Rivaldo Allung Defmit B.N. Riwu Dominggus Godlief Heryson Adoe Ishak S. Limbong Jahirwan Ut Jasron Jason Yuniando Willa Here Muhamad Jafri Murni pallawagau Sam Rudian Rivaldo Fanggidae Sefriano Muti Seran Suprianto Siagian Tobe, Adi Yermia Verdy A Koehuan Vinsen Yuminto Bifel Yohanes T. Luluk