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Analisa Pengujian Lelah Material Bronze Dengan Menggunakan Rotary Bending Fatigue Machine Rahmatullah Rahmatullah; Rohadi Ahmad
Rekayasa Material, Manufaktur dan Energi Vol 1, No 1: September 2018
Publisher : Fakultas Teknik UMSU

Is a material fatigue due to repeated loading. damage caused by repeated loads (Fatigue Failures), The test is carried out as much as 5 x using a fatigue tester, With the Rotary Bending type the load variations are given as follows: 10kg, 15kg, 20kg, 25kg, and 30kg. fatigue is very dangerous compared to static failure because the failure occurred without warning, or suddenly and in a rush, Experiment 1: Cycle with 22741 with a time of 12.06 minutes given a load of 10 Kg with the results of calculation = 34.226 Mpa, Experiment 2: Cycle with 20786 with a time of 11.59 minutes given a load of 15 Kg with the results of calculations = 51,339 Mpa, Experiment 3: Cycle with 17033 with time 11,39 minutes given load 20 Kg with result of calculation = 68,45 Mpa, Experiment 4: Cycle with 8640 with time 06,39 Minutes given load 25 Kg with result of calculation = 83,333 Mpa, Experiment 5: The cycle with 4541 with a time of 03.27 minutes was given a load of 30 Kg with the result of calculation = 102.667 Mpa. With conclusions as follows, Bronze Tired Resistance decreases as the voltage increases.

Analisa Pengaruh Diameter Impeller Terhadap Kapasitas Dan Penurunan Tekanan Blower Sentrifugal K. Umurani; Rahmatullah Rahmatullah; Fariz Aulia Rachman
Rekayasa Material, Manufaktur dan Energi Vol 3, No 1: Maret 2020
Publisher : Fakultas Teknik UMSU

Blower is a device used to increase or increase the pressure of air or gas that will be flowed in a particular room as well as suctioning certain air or gas where the Blower produces a relatively high pressure ratio with a greater volume of gas flow. At present the role of the Blower has begun to be widely used, especially in the engineering field, where the Blower role was created to facilitate the process of air exhaust. The blower itself is a producer of air movement which is generally used for ventilation. Blowers consist of several types, namely Axial Blowers and Centrifugal Blowers. Blowers have one component, namely Impeller. To determine the right diameter of the impeller, a performance test on centrifugal blowers with different variations in the size of the impeller diameter is needed, such as an anemometer, wattmeter and tachometer, and the impeller diameters are 180 mm, 190 mm and 200 mm with a rotational speed of 1500 rpm. The results obtained from testing on the diameter of the 200 mm impeller obtained the highest efficiency with a value of 0.0086%. The maximum air velocity is found in the diameter of the impeller with a size of 200 mm which is equal to 19.82 km / h. Then, the maximum pressure drop (∆p) is found at the diameter of the impeller with a size of 200 mm and 190 mm with the same result which is 136,206954 Pa. Then followed by the largest capacity value (Q) found in the variation of the diameter of the impeller with a size of 200 mm that is equal to 118.92 m3 / h. And the largest motor power is found in variations in the diameter of the impeller with a size of 200 mm that is equal to 62.85 W.

Pengembangan Lintasan Pahat Pada Pengefraisan “Umsu” Menggunakan Cnc Tu-3a Rahmatullah Rahmatullah; Khairul Umurani; Munawar Alfansury Siregar
Rekayasa Material, Manufaktur dan Energi Vol 4, No 1: Maret 2021
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v4i1.6690

Computer numerically controlled (CNC) machines have long been known and used in various industrial sectors such as the aircraft, shipping, automotive, molding and others industries. Various types of existing CNC machines such as CNC turning, CNC milling, CNC shaping, CNC drilling, CNC laser cutting and others have been commonly used in various manufacturing industries. CNC machines for production units and training unit CNC machines can be used according to milling machining parameters, machine capacity, product quality targets and workpiece material types. In milling machining using a 3-A training unit CNC machine, the first step is to design a workpiece, design G and M codes, simulate it using software such as CAD / CAM and can also be done by simulating it with a pen plotter. After evaluating and the simulation results are in accordance with the workpiece design, it can be executed for product machining. Different designs of CNC machining products have different toolpaths. In general, there are three types of techniques for path generation tools, namely iso-parametric, iso-planner, and iso-scallop height. Tool path generation on "UMSU" CNC milling machining using the CNC TU-3A has been developed a toolpath generation suitable for the "UMSU" machining. The type of tool path generation technique to be used can be considered from several factors including the complexity of the product design, the type of milling tool used, product quality, machining time and other factors.

Pengaruh Variasi Putaran Spindel Terhadap Gaya Potong pada Proses Pemesinan Arya Rudi Nasution; Rahmatullah Rahmatullah; Jagodang Harahap
VOCATECH: Vocational Education and Technology Journal Vol 2, No 2 (2021): April
Publisher : Akademi Komunitas Negeri Aceh Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38038/vocatech.v2i2.56

Abstract This study aims to see the cutting force that occurs during the lathe machining process using two different types of aluminum specimens. The research data collection method uses sensor aids; there are three sensors: a load cell sensor for cutting force, a photoelectric counter module for rotation (rpm), and a thermocouple for feeding temperature. The results showed that each specimen tested had a different value in each test, such as testing on Pure Aluminum (Al 1100) specimens with a depth of cut of 0.3 mm and variations in rotation. It can be seen that the DCMT tool blade is greater than the cutting force DCGT chisel. The cutting force produced on the DCMT tool blade is 9.91N with a rotation of 90 rpm, and at 190 rpm the DCMT tool gets a force of 6.83N. Whereas in the Al 2024 specimen using the DCMT chisel, the highest cutting force was at 90 rpm rotation of 8.34N, and there was a decrease at 190 rpm rotation of 4.56N. For DCGT chisels using Al 1100 specimens, the highest cutting force results at 90 rpm rotation of 4.22N and a decrease in cutting force at 190 rpm rotation of 2.9N, and for the highest cutting force in Al 2024 specimens at 90 rpm rotation of 3.84N, experienced a decrease in cutting force at 190 rpm rotation of 3.2N. It can be concluded that the decrease in cutting force is influenced by the amount of rpm used because the vibration that occurs is also large. Keywords: Spindle speed, Cutting force, Tool insert. __________________________ Abstrak Penelitian ini bertujuan untuk melihat gaya potong yang terjadi pada saat proses pemesinan bubut dengan menggunakan 2 jenis spesimen aluminium yang berbeda. Metode pengambilan data penelitian menggunakan alat bantu sensor, ada tiga sensor yaitu sensor load cell untuk gaya potong, photoelectric counter module untuk putaran (rpm) dan thermocouple untuk temperatur pemakanan. Hasil penelitian menunjukan bahwa setiap spesimen yang di uji memiliki nilai yang berbeda disetiap pengujian, seperti pengujian pada spesimen Alumunium Murni (Al 1100) dengan kedalaman pemakanan (depth of cut) sebesar 0,3 mm dan variasi putaran, dapat diketahui pada mata pahat DCMT lebih besar gaya potong yang terjadi dibandingkan dengan pahat DCGT. Gaya potong yang dihasilkan pada mata pahat DCMT sebesar 9,91N dengan putaran 90 rpm dan pada putaran 190 rpm pahat DCMT mendapat gaya sebesar 6,83N. Sedangkan pada spesimen Al 2024 menggunakan pahat DCMT gaya potong yang tertinggi pada putaran 90 rpm sebesar 8,34N dan terjadi penurunan pada putaran 190 rpm sebesar 4,56N. Untuk pahat DCGT menggunakan spseimen Al 1100 hasil gaya potong yang tertinggi pada putaran 90 rpm sebesar 4,22N dan terjadi penurunan gaya potong pada putaran 190 rpm sebesar 2,9N, dan untuk gaya potong yang tertinggi pada spesimen Al 2024 pada putaran 90 rpm sebesar 3,84N, mengalami penurunan gaya potong pada putaran 190 rpm sebesar 3,2N. Dapat disimpulkan bahwasanya penurunan gaya potong dipengaruhi oleh besarnya rpm yang digunakan, karena getaran yang terjadi juga besar. Kata Kunci: Spindle speed, Gaya potong, Tool insert. __________________________

Development of new renewable energy hybrid system for simple home electricity purposes Rahmatullah Kasim; Khairul Umurani
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 16, No 1 (2022): SINTEK JURNAL
Publisher : University of Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.16.1.46-52

The need for energy has now become a major problem that is increasingly complex in all countries in the world to support their economic growth. These various conditions require the need for new renewable energy that can answer these challenges. Wind energy and solar cells have become one of the solutions to reduce dependence on fossil energy. Wind energy and solar energy are actually the most promising sources of energy considering their sustainable nature and very large amounts to be used as electrical energy for lighting in simple people's homes. A wind turbine is a prime mover that utilizes wind energy to drive the turbine blades which are then transformed in the form of mechanical energy to rotate the turbine shaft. Solar energy is energy in the form of light and heat from the sun, which technology can be applied to a variety of energies, including solar thermal electrical energy. New and renewable energy with hybrid or combined systems for home-scale power plants is very much needed to ensure the continuity of the existence of electrical energy and efficiency. The combined and hybrid system models that have been developed and applied are hybrid solar cells and wind turbines.

Analisis Pengaruh Bio Additive Pada Bahan Bakar Terhadap Unjuk Kerja Mesin 4 Langkah Poppy Aprilya Sitorus; Rahmatullah Rahmatullah; Darianto Darianto; Muhammad Idris
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 6 No. 2 (2022): Edisi Desember 2022
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v6i2.6869

Bioadditives are elements derived from plants that are used as additives to improve fuel quality. Citronella oil is one type of essential oil that has been studied for its potential as a fuel bio additive because of its volatility and ability to dissolve into fuel. The purpose of using this bioadditive is to increase engine performance. This research was conducted using an experimental method, some of the samples tested consisted of pertalite fuel, bioethanol then the development was carried out by adding the Bioadditive element citronella oil to the fuel with a ratio of 2,0 : 1000 ml, 3,0 : 1000 ml, and 3,5 : 1000 ml. The sample test was aimed to measure engine performance using a dynamometer. The results of this study show that the use of citronella bioadditives can improve motorcycle performance, the maximum power increases by 55% at a ratio of 2,0 : 1000 ml, and the optimum torque is achieved by 39% at a ratio of 2,0 : 1000 ml. In addition to these tests, measurement of fuel consumption is also carried out by producing a savings of 10%, using a ratio of 2,0 : 1000 ml.

EFFECTIVENESS OF CNC TURNING AND CNC MILLING IN MACHINING PROCESS Rahmatullah Rahmatullah; Arfis Amiruddin; Sudirman Lubis
International Journal of Economic, Technology and Social Sciences (Injects) Vol. 2 No. 2 (2021): October 2021
Publisher : CERED Indonesia Institute

Technological developments and advances in the digital era are currently growing rapidly along with the times, so that they have an impact in all sectors including the manufacturing industry sector. Competition in the manufacturing industry is getting higher, both in the field of supporting equipment technology and in the production sector. This makes all interested parties and companies compete to create more technical and practical equipment. The manufacture of equipment, parts, components and manufactured products in the past still used conventional machines such as lathes, milling machines, scrap machines and other machines in general and are still used today for certain jobs. The manufacture of parts such as shafts, factory components, heavy equipment components, car components, aircraft components and other engineering equipment components still uses conventional machines in a small part of the manufacture of parts and components. In jobs that require high production rates, short production times and high and uniform quality, using conventional machines is not recommended. Machines with CNC technology with computer-assisted numerical control or the like have been the solution for decades. In this paper, we will discuss the effectiveness of CNC machines, especially the TU-3A EMCO CNC milling as an illustration by developing G, M code programming, and product examples.

The New Renewable Energy Hybrid Systems for Simple Home Electricity Purposes Rahmatullah; Khairul Umurani; Sudirman Lubis
International Journal of Economic, Technology and Social Sciences (Injects) Vol. 3 No. 1 (2022): May 2022
Publisher : CERED Indonesia Institute

The need for energy has now become a major problem that is increasingly complex in all countries in the world to support their economic growth. These various conditions require the need for new renewable energy that can answer these challenges. Wind energy and solar cells have become one of the solutions to reduce dependence on fossil energy. Wind energy and solar energy are actually the most promising sources of energy considering their sustainable nature and very large amounts to be used as electrical energy for lighting in simple people's homes. A wind turbine is a prime mover that utilizes wind energy to drive the turbine blades which are then transformed in the form of mechanical energy to rotate the turbine shaft. Solar energy is energy in the form of light and heat from the sun, which technology can be applied to a variety of energies, including solar thermal electrical energy. New and renewable energy with hybrid or combined systems for home-scale power plants is very much needed to ensure the continuity of the existence of electrical energy and efficiency. The combined and hybrid system models that have been developed and applied are hybrid solar cells and wind turbines.

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