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Muhamad Jafri
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LONTAR Jurnal Teknik Mesin Undana (LJTMU )
Published by Universitas Nusa Cendana
ISSN : 23563222     EISSN : 24073555     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Lontar Jurnal Teknik Mesin Undana merupakan jurnal ilmiah rekayasa teknologi, khususnya bidang Teknik Mesin, meliputi: Energy Convertion, Manufacture Process, Engineering Design, Material Engineering.
Arjuna Subject : -
Articles 216 Documents
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Perhitungan Umur Pakai Lapisan Teflon pada Permukaan Prototype Alat Masak dari Ketahanan Aus Terhadap Gesekan Sutil Bayu Aji, Alam Prasetya; Suyitno, Suyitno; Hilm, Fuad y
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.v12i02.16852

Abstract

Teflon-coated cookware is a disposable product because its use involves an inevitable physical destruction process. The wear and tear of the glaze during the cooking process is one of the physical destruction processes that cause damage to the teflon coating. The time until the occurrence of damage to the teflon coating due to wear from the friction of the utensil can be used to calculate the service life of the teflon coating. This study uses the Weibull distribution method to calculate the service life of the teflon coating on the cookware prototype, with the calculation results showing an expected lifespan of about 20,335.5 friction with a reliability level of 47%. The results of these calculations are a description of the specifications of the service life of the Teflon coating on the cookware prototype that will be used in household kitchens.
ANALISIS BAHAN BAKAR MINYAK HASIL PIROLISIS SAMPAH PLASTIK JENIS PP (POLYPROPYLENE )TERHADAP KARAKTERISTIK MINYAK YANG DIHASILKAN Ashsidiq, Muhammad Hasby; Adoe, Dominggus G. H.; Riwu, Defmit B.N.; Sina, Dantje A. T.; Ginting, Almido H,; Doo, Samy Y.
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.v12i02.17278

Abstract

This research aims to determine the density and viscosity of oil resulting from pyrolysis of plastic waste and to find out the relationship between density and viscosity of the pyrolysis oil produced. This research was carried out using polypropylene (PP) plastic, with the reactor used being a single reactor with the reactor temperature set at 200c and 250c. The results of the research show that the density is 0.751 – 0.773 kg/l, the viscosity is 0.574822548 – 0.841376288 cPs, where during the research carried out density and viscosity have an interrelated relationship. Changes in pyrolysis temperature can significantly affect the viscosity and density of pyrolysis oil, besides that, different research times and materials can influence the results of the pyrolysis process.
ANALISIS FASA KRISTALIN PADA TULANG SAPI TIMOR DENGAN VARIASI WAKTU DAN TEMPERATUR PEMANASAN DENGAN PENGUJIAN XRD soko, raymundus rheymon; Maliwemu, Erich U. K.; Adoe, Dominggus G. H.
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.v12i02.18033

Abstract

The aim of this research is to identify the crystalline phase of Timor cattle bone powder and characterize it using XRD (X-Ray Diffraction) testing. This research uses a method of analyzing the results of XRD (X-Ray Diffraction) of Timor beef bones with variations in heating time and temperature. After the beef bones have been ground, the sample is oven-treated for 1 and 2 hours at a temperature of 1000C, then 5 grams of the sample is taken for testing using XRD (X-Ray Diffraction). The research results show that a 1 hour time variation at a temperature of 100 0C has a purity level of 84.07% with a diameter of 32.81 mm, and a crystallinity of 85.1%. And a time variation of 2 hours at a temperature of 1000C has a purity level of 76.68% with a diameter of 31.97 nm, and a crystallinity of 98.0%.
Pengaruh Penambahan Phasa Change Material (PCM) Terhadap Sistem Penyimpanan Energi Termal Baterai Pasir AOETPAH, YARDESH; Dwinanto, Matheus M.; Koehuan, Verdy A.; Selan, Rima N.
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.v12i02.20103

Abstract

The thermal energy storage system through sand media is one of the energy storage solutions that has great potential to be developed to meet energy needs. PCM is a type of latent heat storage that has been developed as a good thermal energy storage material. The purpose of this study was to analyze the efficiency of thermal energy storage in sand media equipped with phase change material (PCM) stored in a drum container as a sand battery. The results of this study indicate that the use of sand batteries without PCM tends to be low at the beginning of the heating time by the heater element and increases at the end of the heating time. The use of PCM where the PCM changes phase from solid to liquid tends to absorb higher heat than media without PCM so that efficiency increases and tends to be stable until the heat release process is also longer than media without PCM. While in media without PCM, there tends to be a slower increase in thermal efficiency and a shorter time for the heat release process than media with
The Effect The Effect of Fiber Orientation on the Compressive Strength of Palm Fruit Fiber Composite Beams hanmina, Marsianus mario fredirikus; Pell, Yeremias M.
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.v12i02.21556

Abstract

The demand for wood for construction continues to increase, while the supply of quality wood is decreasing. Therefore, a new alternative is needed to replace wood, one of which is by utilizing palm fruit fiber as a basic material for making composite wood as a new material to replace wood. This study uses an experimental testing method where the composite beams that have been molded by hand lay-up press with polyester resin reinforced with palm fruit fiber that has been treated with 5% alkali for 2 hours, and a fiber volume fraction of 35%. The variations in fiber orientation tested include parallel and perpendicular fibers. The compressive strength test specimens were made according to the ASTM D695-02a standard and tested using a compressive strength testing machine. The test results showed that the composite beam with parallel fibers had the highest average compressive strength and tension, namely 13,851.72 MPa and 42.94 MPa, while the perpendicular fiber orientation produced the lowest value. The highest strain was obtained in the composite with parallel fiber orientation, namely 0.16. While the highest modulus of elasticity was obtained in the composite beam with perpendicular fiber orientation, namely 432.38.
RANCANG BANGUN MESIN MIXER PUPUK ORGANIK silambi, Yosua Guntur; Mangesa, Daud P.; Pell, Yeremias M.
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.v12i02.22881

Abstract

Organic fertilizers are fertilizers composed of living matter, such as weathering of animal and human plant residues. Organic fertilizers have more organic matter than nutrient content. Organic fertilizers have the advantage of being environmentally friendly, providing nutrients and macro elements for plants, functioning as soil dividers, improving soil structure, improving soil pore size which in turn makes water holding capacity and soil aeration better. Raw materials that can be used in making organic fertilizers include animal manure, rice husks, soil and charcoal. making organic fertilizer is a very heavy job and requires a long time to produce organic fertilizer until it is ready to use if done manually. This is what encourages research to increase the author's knowledge in the research “DRY ORGANIC PUPUK MIXER MACHINE DESIGN” in order to help make it easier to produce organic fertilizer in the next two decades
HEAT TREATMENT PADA MATA PISAU ALAT PENGHANCUR ARANG BIOMASA UNTUK MENINGKATKAN NILAI KEKERASAAN DENGAN VARIASI TEMPERATUR Otu, Agustinus; Pah, Jack C.A.; Jasron, Jahirwan Ut
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.
Analisis Kinerja Mesin Drum Cleaner Dalam Proses Manajemen Bahan Baku Jagung di PT. Sidoagung Farm Magelang Jafri, Muhamad; Tenis, Yohanes Babtista Rojerio; Boimau, Kristomus; Tobe, Adi Y.
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.v12i02.23667

Abstract

PT. Sidoagung Farm Magelang merupakan perusahaan yang bergerak di bidang produksi pakan ternak dengan bahan baku utama jagung. Salah satu tahapan penting dalam pengelolaan bahan baku jagung adalah proses pembersihan menggunakan drum cleaner. Efektivitas dan efisiensi drum cleaner dalam proses ini dapat memberikan dampak yang signifikan terhadap kualitas akhir pakan ternak. Metode analisis yang digunakan dalam penelitian ini meliputi pengumpulan data, pengukuran kinerja, dan analisis data. Parameter yang diukur meliputi kapasitas proses, persentase kebersihan jagung, efisiensi pembersihan, persentase downtime, dan availability. Hasil penelitian menunjukkan bahwa drum cleaner memiliki kinerja yang baik dalam membersihkan bahan baku jagung untuk produksi pakan ternak, dengan kapasitas produksi sebesar 38.20674 ton/jam, persentase kebersihan sebesar 99,816%, nilai efisiensi pembersihan sebesar 0,184%, downtime sebesar 13,79%, dan availability sebesar 86,21%. Mesin ini handal dalam membersihkan bahan baku jagung untuk produksi pakan ternak. Namun, faktor-faktor seperti kecepatan putaran drum, kondisi jagung sebelum dibersihkan (termasuk kadar air dan tingkat kotoran), dan desain lubang drum memengaruhi kinerja pembersihan drum.
Evaluasi Penerapan Kesehatan Dan Keselamatan Kerja Di Bengkel Teknologi Mekanik Jurusan Teknik Mesin Politeknik Negeri Kupang Dengan Metode HIRADC Ratu, Desi Natalia; Tuati, Amros A.; Rerung, Oktavianus D.; Lomi Ga, Jonri; johanis, Alexius L.
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.v12i02.24262

Abstract

HIRADC (identification, hazard analysis, and risk control) is the application of controls used to systematically review processes or operations in a system. This research using HIRADC method, summarized in the form of transcripts, analyzed using research forms and risk assessment matrices to identify the hazards levels present in the mechanical technology workshop/laboratory, measurements taken to prevent accidents. Based on the interview results, it was found one accident. The questionnaire results showed the majority of respondents had a positive perception of safety and service quality, Over 70% stating that it was safe and of good quality. However, the frequency of service use was relatively low, with over 50% of respondents stating they had never used the service. Identification and evaluation revealed 1 High Risk, 6 Moderate Risks, and 1 Low Risk. Based on these results, they were categorized as 75% physical and 25% chemical. In addition to the results of technical, administrative, and PPE controls, the steps presented in this study include control measures and preventive actions that can be implemented to improve OSH aspects in the laboratory. Thus, workshop/laboratory managers can develop strategies to reduce risks and enhance user safety.
Rancang Bangun Dan Validasi Alat Uji Kekerasan Brinell Sederhana Menggunakan Dongkrak Botol Jamalulail, Nurul; Supriyanto, Ari; pratama, wisnu fajar; Fato, Adri
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.v12i02.24393

Abstract

Penelitian ini membahas perancangan, pembuatan, dan validasi alat uji kekerasan Brinell sederhana dengan menggunakan dongkrak botol hidrolik sebagai beban utama. Tujuan penelitian ini adalah menghasilkan alat uji yang lebih ekonomis, mudah dibuat, dan praktis untuk keperluan pendidikan dan praktik di Universitas Dian Nusantara. Proses penelitian meliputi perancangan menggunakan perangkat lunak Autodesk Inventor 2021, pembuatan komponen utama, dan validasi alat. Material utama yang digunakan untuk rangka antara lain baja UNP, IWF, pelat baja A36, dan baja S45C. Hasil validasi menunjukkan bahwa rangka mampu menahan beban hingga 3000 kgf tanpa mengalami deformasi yang berarti dengan toleransi yang dapat diterima. Pengujian menggunakan material aluminium 5052 menghasilkan indentasi yang konsisten sebesar 7,1 mm, sesuai dengan standar kekerasan 60-65 HB. Hasil penelitian ini menunjukkan bahwa alat yang dirancang memiliki akurasi yang cukup untuk digunakan sebagai alat pembelajaran dan praktik.

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