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All Journal Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY Jurnal Rekayasa Material, Manufaktur & Energi Martabe : Jurnal Pengabdian Kepada Masyarakat AMALIAH: JURNAL PENGABDIAN KEPADA MASYARAKAT Jurnal Abdi Insani IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) IRA Jurnal Pengabdian Kepada Masyarakat Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Bobby Umroh
Universitas Medan Area
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Other

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DESIGN AND MANUFACTURE OF SKATEBOARD FROM BANANA STEM Zulfikar, Achmad Jusuf; Umroh, Bobby; Siahaan, Muhammad Yusuf Rahmansyah
JMEMME (JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY) Vol 3, No 2 (2019): EDISI DESEMBER
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (241.858 KB) | DOI: 10.31289/jmemme.v3i2.3022

Abstract

A skateboard is a small piece of wood shaped like a surfboard with four wheels attached to it that is used to glide on a certain track. In general, this tool is made using wood material taken from nature and vulnerable to environmental damage issues. In this research, the waste of banana stems will be processed into the main raw material for skateboarding. The type of material chosen is the type of composite material with banana stem waste selected as reinforcement and polyester resin as the matrix material. The purpose of this research is to design and manufacture a skateboard made of composite fiber reinforced banana stem fibers and to test its flexural strength to obtain the characteristics of the material formed. The design was carried out with the help of the 2007 version of Autocad software by following commercial skateboard standards.  Flexural testing was carried out at the Impact and Fracture Research Center laboratory, Faculty of Engineering, University of North Sumatra. Static static testing of polymer composite board specimens from banana stems obtained the average value data for the composition of 5% banana stems is 9.81 MPa, for the composition of 10% banana stems an average of 13.60 MPa, and composition of 15% banana stems the average is 27.20 MPa. 2. The analysis shows that the best composition is 15% of banana stems, with an average flexural strength value of 27.20 MPa. Therefore, the composition used in this study is the composition of 15% reinforcement of banana stems.
ANALISA GAYA DAN SUDUT RAHANG PADA ALAT PEMBUKA BUAH DURIAN METODE GERAK PUTAR RELATIF Danis Nainggolan; Achmad Jusuf zulfikar; bobby umroh
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol 3, No 2 (2019): EDISI DESEMBER
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v3i2.2813

Abstract

Pada prinsipnya, teknologi dipergunakan manusia untuk memberikan kemudahan dan peningkatan terhadap efisiensi kerja, baik ditinjau dari sisi waktu maupun biaya produksi. Pada penelitian ini, sebuah alat pembuka buah durian dengan metode rahang berputar telah dibangun dan telah diuji. Analisa gaya untuk membuka buah durian dengan menggunakan alat ini menjadi fokus utama dalam penelitian ini. Tujuan penelitian ini ialah mengukur beban dan sudut pengupasan buah durian serta menghitung kapasitas dan efisiensi alat tersebut. Metode pengambilan data pengujian ialah dengan meletakkan alat pengukur beban pada alat pembuka buah durian dan mencatat nilai beban yang diberikan selama proses pengujian berlangsung. Buah durian diletakkan dalam rahang khusus yang dapat digerakkan berputar relatif terhadap pisau. Jenis buah durian yang dipergunakan dalam penelitian ini terdiri dari buah durian matang dan buah durian mentah. Hasil yang diperoleh ialah gaya rata-rata yang dibutuhkan untuk membuka buah durian matang ialah 99 N dengan sudut rahang rata-rata 45o dan waktu rata-rata 9,5 detik. Sedangkan untuk buah durian mentah, gaya rata-ratanya ialah 134 N dengan sudut rahang rata-rata hingga 80o dan waktu proses pembukaan rata-rata hingga 15 detik. Kapasitas alat untuk buah matang ialah 185 buah/jam dan buah mentah 144 buah/jam. Efisiensi alat untuk buah matang dan mentah adalah sama, yaitu mencapai hingga 85%.
NUMERICAL ANALYSIS OF STRENGTH OF REAR BRAKE HOLDER FLAT ON THE MOTOR CYCLE DUE TO IMPACT LOAD Zulfikar Zulfikar; Bobby Umroh; Amrinsyah Amrinsyah; Fadly A Kurniawan
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol 2, No 1 (2018): EDISI JUNI
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v2i1.1648

Abstract

Brake is one of vital motorcycle element, which serves as a speed reduction mechanism. This section reinforced with retaining plate which serves to hold the wheels when braking process occurs. Research on the plate strength is still rarely found. Stress distribution that occurs on the plate due to shock loads is also not well known. Therefore, this study aims to obtain the strength retaining plate with a numerical analysis of the distribution of stress and deformation which occur on plate. Research done in two ways, experimentally and numerical simulations. Experimentally, direct measurements on the amount of stress that occurs on the plate. The research was done by putting strain gage on the connection plate and brake. In simulation, using Nastran software with the primary data based on the results of the experimental measurements. Based on the results of the numerical analysis of the stress distribution that occurs is obtained that the maximum stress distributed around the staging area in direct contact with the brake. Therefore, motorists should be aware that section and provide additional anchoring structure to further strengthen the structure of the retaining plate rear brake.
Karakteristik permukaan dan struktur mikro Pada bahan aluiminium 6061menggunakan Pahat Karbida dengan metode pemesinan laju tinggi dan pemesinan kering bobby umroh
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol 1, No 2 (2017): Edisi Desember
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v1i2.1172

Abstract

Penelitian pemesinan laju tinggi  dan kering dengan tujuan untuk kemasan permukaan yang meliputi corak permukaan cacat (defect) yang diakibatkan oleh kondisi pemesinan  pada  bahan aluminium 6061 menggunakan pahat karbida. Pengumpulan data pengujian pemesinan ini dilakukan menggunakan metode faktorial data sebanyak 8 kali percobaan dengan 3 variabel utama yaitu laju pemotongan(V), laju pemakanan (f) dan kedalaman potong (a) pada tiga tiga tingkat besaran. Dari percobaan yang telah direkomendasikan dengan kondisi pemesinan terbaik  maka didapati beberapa Nilai kekasaran permukaan sangat ditentukan oleh aus pahat yang tinggi. Aus pahat yang tinggi (0.129-0.247)sangat berpotensi terjadi cacat berupa koyak permukaan (tearing surface) permukaan benda kerja termesin, pada laju pemakanan yang tinggi terjadi feed mark goresan karena laju pemakanan yang tinggi .Lebar butiran pada mikrostruktur sangat ditentukan oleh kecepatan potong, dimana pada kecepatan potong V= 1000 m/min besarnya butiran terlihat lebih melebar sedangkan pada V=1250 m/min besar butiran terlihat lebih rapat
Manufacture of Water Pipe From Clampshell Powder Materials Abdul Rahmansyah; zulfikar zulfikar; bobby umroh
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol 2, No 2 (2018): Edisi Desember
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v2i2.2105

Abstract

In general, household waste water pipelines use plastic pipes of PVC type that are not environmentally friendly and are relatively expensive. Therefore, this research will design molds and manufacture of composite pipes using raw materials of clampshell powder. The raw material used is clampshell powder with the composition of MgO and CaO compounds which is about 22.28% and 66.70%. The mixture of materials used consisted of clampshell powder with a size of 40 mesh, catalyst, and unsaturated polyester resin as a matrix. The objective of this study is manufacture of water pipes made from polymer composites reinforced by clampshell powder. Composite pipe manufacturing is carried out using the casting method. Pipe molds are made of stainless steel with a diameter of 40.46 mm (1.6 in) and an outer diameter of 50.8 mm (2 in). This mold size follows SNI 06-0084-2002 standards. The results of the study, water pipes from polymer composite material reinforced by clampshell powder with an inner diameter size of 40.64 mm and varying outside diameter. This variation depends on the composition of the clampshell powder in composite materials. The greater the clampshell powder composition, the more easily the maximum pipe wall thickness can be obtained. The average wall thickness variation is 3.35 mm. This variation is still included in the polymer water pipe requirements, which is a minimum of 2 mm.
ANALISIS KEKUATAN STRUKTUR RANGKA MESIN PENGERING BAWANG MENGGUNAKAN PERANGKAT LUNAK ANSYS APDL 15.0 Azwir Sofyan; Jean Glusevic; Achmad Jusuf Zulfikar; Bobby Umroh
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol 3, No 1 (2019): EDISI JUNI
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v3i1.2417

Abstract

Typical technology for processing red onion affects the quality of red onion produced. The process of drying red onion is one of the important factors in producing the best quality of red onion. Environmentally friendly and easy operation and maintenance technology is the desired technology. In the process of engine design, the strength of the material and structure are the main factors of the building of the machine. Calculation with finite element method (FEM) is the best choice to obtain information on stress distribution on a machine structure. In this study, the calculation of the FEM method was assisted by Ansys APDL 15.0 software. The objectives of this study were: (1) calculation of the load on the tray structure, (2) the distribution of stress on the tray structure, seat, and frame for red onion dryers, and (3) analyzing the strength of the material using the Tresca and Energy Distortion methods. The input load comes from the weight of the tray and red onion. The analytical method used is the finite element method with the type of structural analysis and Beam 3Node 189 element type. Based on the FEM simulation results, the maximum stress that occurs in the tray is 1.22 MPa and the maximum deflection is 0.0055 mm. The maximum stress in the tray support structure is 33.25 MPa and the maximum deflection is 0.014 mm. The maximum stress on the frame structure of the onion drying machine is 0.89 MPa and the maximum deflection is 0.000235 mm which occurs in the middle of the machine structure. Using the Tresca and Distortion Energy theories, it is found that the stresses that occur are still far from the failure criteria for all structures. Likewise, the deflection that occurs is very small so that the construction of the onion drying machine is safe to use.
Numerical Simulation on Mechanical Strength of a Wooden Golf Stick Darianto Darianto; Bobby Umroh; Amrinsyah Amrinsyah; zulfikar zulfikar
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol 2, No 1 (2018): EDISI JUNI
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v2i1.1652

Abstract

In general, golf players only know the techniques used in Golf games, but do not know the golf sticks response that occurs when the ball is hit. Referred to as response is the stress and strain that arises from the impact load that occurs when the hitting member touches the ball. The objectives of this research are: (a) to analyze golf sticks response when impact occurs, and (2) to know the stress distribution that occurs in golf sticks. The golf stick design in this study uses the autodesk inventor software. The material used is Titanium for head stick and Graphite for stick rod. The basic principle of this study is based on simple swing pendulum method. The variables that will be used for simulation are: swing speed, that is difference between start and end speed, that is Δv = 272,2 m / s, impact time, which is the time when the ball touches the batter Δt = 0.0005 seconds, the volume of the head of the stick Vo = 96,727 mm3, the cross-sectional area of the stick A = 63,504 mm2, the head mass of the sticks ρ = 4620 kg / m3, and the modulus of titanium elasticity 9.6 e +10 Pa. From the simulation result on the surface of the golf club hitter is obtained as follows: σmax = 2.1231e +10 Pa at 1.231e-06 s, emax = 0.22115 m / m at 1.231e-06 s, and the maximum stress and strain is located in the area the connection between the stick and the head of the stick.
ANALISA KINERJA MATA PISAU MESIN PENGIRIS KULIT KELAPA MUDA Bobby Umroh; Darianto Darianto; Rinto Supardi Sipangkar
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol 3, No 1 (2019): EDISI JUNI
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v3i1.2429

Abstract

Kelapa muda umumnya disajikan secara alami dengan bentuk kerucut di atas. Proses pembentukan kelapa ini sudah dilakukan secara manual di industri rumah tangga dengan menggunakan sebilah parang. Proses ini memiliki resiko kecelakaan kerja yang tinggi. Kelapa yang dihasilkan pada proses ini memiliki bentuk yang kurang menarik, tidak seragam, dan sulit untuk dibuka. Oleh sebab itu, dibutuhkan alat pengiris kulit kelapa muda yang dapat menghasilkan bentuk yang lebih baik, seragam, dan aman untuk digunakan. Untuk merancang alat pengiris kulit kelapa muda, penting untuk melakukan analisis mekanisme pemotongan kulit kelapa muda. Tujuan dari penelitian ini adalah untuk menganalisis mekanisme pemotongan kulit kelapa muda, membangun model matematika pendugaan gaya spesifik pemotongan, dan mendapatkan daya pemotongan maksimum pemotongan kulit kelapa muda. Variasi faktor sudut ketajaman, sudut potong, dan sisi mata pisau dioptimalkan untuk menghasilkan gaya potong terendah. Model matematika telah dibangun untuk menduga gaya pemotongan maksimum untuk pisau satu sisi menajam dan dua sisi menajam dengan sudut potong (θ) 00, 150, dan 300. Dari hasil penelitian disimpulkan bahwa jenis pisau yang menghasilkan gaya pemotongan terendah adalah pisau dua sisi menajam dengan sudut ketajaman 100 dan sudut potong 300. Daya terendah untuk pemotongan tegak lurus kulit kelapa muda adalah 0,12 kW yang dihasilkan dengan menggunakan pisau dua sisi menajam dengan sudut ketajaman 100 dan sudut potong 300. Daya pemutaran maksimum yang dibutuhkan untuk memotong kulit kelapa muda adalah 0,75 kW.
Study on the CBN Tool Wear Mechanism on Dry High-Rate Turning Process for AISI 4140 Budi Harto; Bobby Umroh; Darianto Darianto
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol 2, No 1 (2018): EDISI JUNI
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v2i1.1654

Abstract

This study aims to investigate tools wear and wear mechanisms when machining high-rate extreme minimum lathe AISI 4140 material in hard and dry cutting conditions. Cutting tool made from CBN CB7015 Sandvik Coromant production is used for turning of AISI 4140 steel in order to obtain the failure mode of tool and the wear mechanism of the cutting tool. The machining process is carried out under dry cutting conditions with variations of high velocity Vc, feeding rate f, and a cutting depth a at minimum rate conditions. The wear growth curve obtained shows that the CBN tool undergoes three phases: the initial phase, the gradual phase, and the abrupt phase. From the results of the study found that the failure modes that occur are flank wear, crater wear, flaking, chipping, and fracturing catastrophic failure. The wear mechanism that occurs in outline is caused by abrasive, adhesive, and diffusion processes. While the cracks and fractures that occur due to a combination of impact load and thermal shock
SIMULASI KEKUATAN MEKANIS MATERIAL KOMPOSIT TEMPURUNG KELAPA MENGGUNAKAN METODE ELEMEN HINGGA Darianto Darianto; Amru Siregar; Bobby Umroh; Dedi Kurniadi
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol 3, No 1 (2019): EDISI JUNI
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v3i1.2443

Abstract

Komposit merupakan sejumlah sistem multi fasa sifat gabungan, yaitu gabungan antara bahan matriks atau pengikat dengan penguat. Penelitian ini dilakukan menggunakan metode kuantitatif dengan rancangan penelitian eksperimental serta membandingkan hasil pengujian pada metode elemen hingga yang dilakukan penelitian di laboratorium. Objek penelitian berupa serat tempurung kelapa yang dipilih karena melimpahnya sumber daya alam tersebut. Spesimen matriks resin dibuat dengan standar ASTM D 638 M-84 dengan bahan resin epoksi dan katalis menggunakan metode pengecoran. Teknik pengumpulan data yang digunakan adalah teknik pengujian laboratorium. Instrumen yang digunakan berupa lembar pencatatan. Dari hasil penelitian yang dilakukan didapatkan kekuatan tarik komposit tertinggi dengan tata letak random sebesar 3,38 kgf/mm2 dan perpanjangan sebesar 0,38 mm, Cross sebesar 3,03 kgf/mm2 dan perpanjangan sebesar 0,86 mm, continuous sebesar 2,24 kgf/mm2 dan perpanjangan sebesar 1,03 mm, woven sebesar 1,64 kgf/mm2 dan perpanjangan sebesar 0,64 mm. Bentuk patahan menunjukan bahwa hasil pengujian tarik mengalami patahan getas, karena ujung patahan terdapat patahan 900 dan kasar di karenakan adanya mekanisme fiber pull out.
Co-Authors Abdul Rahmansyah Achmad Jusuf Zulfikar Achmad Jusuf zulfikar Ahmad Marabdi Siregar Alfifto Amiruddin, Arfis Amrinsyah Amrinsyah Amrinsyah, Amrinsyah Amru Siregar Amru Siregar Azwir Sofyan Budi Harto Dadan Ramdan Danis Nainggolan Darianto Darianto Darianto Darianto Darianto, Darianto dedi kurniadi Dedi Kurniadi Dinata, Irvan Hendrawan Surya Eka Dewi Setia Tarigan Elapri, Bima Yoel Ellen Lumisar Panggabean Fadly A Kurniawan Fauji S, Ahmad Glusevic, Jean Haniza Harahap, Uun Novalia Harto, Budi INDRA HERMAWAN Iswandi Iswandi Iswandi Iswandi Jean Glusevic Jufrizal Jufrizal Jufrizal Jufrizal Kamaluddin Kurniawan, Fadly A Maulana, M Rizky Muhammad Idris Muhammad Idris Muhammad Yusuf Rahmansyah Siahaan Nainggolan, Danis Nurdiana Nurdiana Prawoto, Yogi Purba, Jepriadi Rahmansyah, Abdul Rahmatullah . Rinto Supardi Sipangkar Sarjana, SS Siagian, Martua Sangap Siahaan, Muhammad Yusuf Rahmansyah Sianturi, Danial Jack Marbis Sipangkar, Rinto Supardi Siti Alhamra Salqaura Siti Mardiana Sofyan, Azwir Tino Hermanto Tumangger, Theo Fredrik Yolanda, Aginta Yopan Rahmad Aldori Yuni Syahputri zulfikar zulfikar Zulfikar, Achmad Jusuf zulfikar, Achmad Jusuf Zulfikar, Achmad Jusuf zulfikar, zulfikar