Machine : Jurnal Teknik Mesin

PERANCANGAN SAMBUNGAN BAUT RANGKA VERTIKAL PADA MESIN CNC MILLING MINI

Ganjar Pramudi — 2025-04-29

Printed Circuit Board (PCB) adalah sebuah medium berbentuk papan yang dilapisi tembaga yang berfungsi untuk menghubungkan dan menyalurkan listrik antar komponen elektronik. Pembuatan jalur PCB dengan kualitas bagus maka perlu penggunaan Mesin CNC Milling Mini agar memudahkan pembuatan jalur PCB yang teliti dan presisi. Mesin CNC Milling Mini merupakan pengembangan dari mesin milling konvensional, yang terdiri dari 3 sumbu axis yaitu X axis, Y axis, dan Z axis yang dapat digunakan untuk membuat jalur PCB. Mesin CNC Milling Mini berukuran 620 mm x 600 mm dan memiliki beberapa komponen antara lain frame, stepper motor, poros, leadscrew, bearing, spindle motor, chuck, endmill, kopling, kotak kontroler, bed. Pada sambungan mesin menjadi komponen penting dalam perancangan mesin yang perlu diperhatikan. Dengan adanya sambungan yang tepat, maka pada perakitan Mesin CNC Milling Mini dapat menjadi kesatuan yang utuh, kuat dan presisi dalam penggunaannya. Perancangan Mesin CNC Milling Mini memerlukan sambungan baut untuk menggabungkan komponen mesin. Sambungan baut berperan penting dalam penerus beban antara rangka vertikal dengan komponen mesin. Pada komponen mesin untuk dipasang di rangka vertikal menggunakan ukuran baut M5 diameter 5 mm dengan kekuatan baut sudah dikatakan aman karena gaya yang bekerja 5.145 N kurang dari beban tarik baut 10.104,3 N.

OPTIMIZATION OF MAIN ENGINE COOLING SYSTEM MAINTENANCE FOR MITSUBISHI 6UEC52LS ON MT. PRINCESS NAOMI

Waris Wibowo — 2025-04-29

The purpose of the study is to optimize the cooling system maintenance on the Mitsubishi 6UEC52LS Main Engine on the MT. Princess Naomi belongs to PT. Waruna Nusa Sentana. This research was conducted in the engine room of the MT. Princess Naomi. This research employed qualitative descriptive approach methods. Data collection techniques were obtained through field research by combining observation methods, documentation, in-depth interviews, and a literature review. Data analysis was conducted in triangulation (combination). The results of the study showed that the maintenance of the diesel engine cooling system on the MT. Princess Naomi belongs to PT. Waruna Nusa Sentana has been running optimally with an average after optimization treatment of 83.75%. The cooling system on the main engine of the MT. Princess Naomi applied a closed cooling system. Parts of the cooling system treated include: expansion tank, centrifugal pump, fresh water cooler, sea chest

EFEK PENAMBAHAN GASKET KEPALA SILINDER DAN VARIASI OKTAN BENSIN TERHADAP PERFORMA MESIN SILINDER TUNGGAL

Bahtiar Rahmat — 2025-04-30

The total motor vehicle sales reflected an increase in people's mobility. Alongside this, the industry were also develop high compression engines to achieve optimal performance. This research aims to examine the effects of adding a cylinder head gasket and variations in the octane number of gasoline used in a single-cylinder internal combustion engine. Dynamometer testing was conducted to observe the differences in torque and power output. The test results indicate that an engine with a compression ratio of 11,8 Kg/cm², coupled with the use of RON 100 gasoline, produces the highest power output, which is 7.90 kW, with peak torque reaching 9.93 Nm. On the other hand, the smallest torque is generated by the same engine when supplied with RON 92 gasoline, at 4.78 Nm, with the lowest power output of 5.43 kW.

PENGARUH VARIASI FRAKSI PENGUAT DAN SUHU SINTERING AMC TERHADAP NILAI DENSITAS DAN KEKERASAN DENGAN SiO2/RHA/BA

sukanto - wiryono — 2025-04-30

Penelitian ini bertujuan untuk mengevaluasi pengaruh variasi fraksi penguat dan suhu sintering terhadap nilai densitas dan kekerasan komposit bermatriks aluminium yang diperkuat dengan pasir silika, baggase ash, dan rice husk ash. Serbuk aluminium daur ulang digunakan sebagai matriks dengan komposisi fraksi penguat sebesar 6%, 8%, dan 10%. Proses pembuatan komposit meliputi pencampuran serbuk menggunakan metode mechanical alloying, dilanjutkan dengan proses kompaksi panas pada suhu sintering 530°C, 550°C, dan 570°C. Pengujian densitas dilakukan berdasarkan standar ASTM B962-17, sedangkan kekerasan diuji menggunakan standar ASTM E110-14. Hasil penelitian menunjukkan bahwa peningkatan fraksi penguat dan suhu sintering berpengaruh signifikan terhadap nilai densitas dan kekerasan. Nilai densitas tertinggi sebesar 2,387 g/cm³ dan kekerasan tertinggi sebesar 45,9 HB dicapai pada fraksi penguat 10% dengan suhu sintering 570°C.

ANALISIS PARAMETER PEMESINAN MESIN CNC LASER DENGAN CONTROLLER ARDUINO UNO PADA BENDA KERJA AKRILIK DENGAN TEBAL 3 MM

Jandri Fan Saragi — 2025-05-05

CNC (Computer Numerical Control) machines have revolutionized manufacturing processes and mechanical engineering by replacing manual methods that rely on human labor. A significant innovation in CNC technology is the use of lasers, which are highly beneficial in the engraving industry. CNC Laser machines are used to etch materials like 3 mm thick MDF boards according to predetermined design patterns. The precision level, removal rate, and engraving quality depend on the material properties, laser source characteristics, and laser parameters. The objective of this research is to determine the appropriate machining parameters for 3 mm thick MDF boards and to identify the optimal working time for engraving on this material. The method used in this study is the experimental method. The results of this research show that the feed rate used is 750 mm/min and the laser power is set at 40%, with a processing time of 4 minutes and 42 seconds to complete the engraving of a logo on a 3 mm thick MDF board.

ANALISIS PENGARUH PENGGUNAAN BAHAN BAKAR ALKOHOL TERHADAP PELEPASAN PANAS DAN KINERJA MESIN PEMBAKARAN

Tri Susilo Wirawan — 2025-05-08

Gasoline engines are crucial, especially in the transportation sector, and currently rely on fossil-based gasoline, which is expected to deplete. To meet domestic energy needs, the country must import gasoline. Therefore, there is a need for renewable energy sources that do not require major modifications to the engine. Methanol, a renewable alcohol fuel derived from plant materials, was tested in a 20% blend with gasoline in a TV-1 engine with a power output of 4.50 kW, a single cylinder, four-stroke configuration, and a cylinder volume of 661.45 cc. The research results indicate that the engine performance with the methanol blend is better in terms of cylinder pressure and heat release. The largest difference in cylinder pressure is 1.91 bar, while the largest difference in heat release is 1.64 J/°C. However, the specific fuel consumption for the methanol blend is higher compared to pure gasoline, with an average specific fuel consumption for the methanol-blended gasoline being 8.7% higher than that of pure gasoline.

UJI KARAKTERISTIK PELET REFUSE DERIVED FUEL (RDF) HASIL PROSES PENGOLAHAN SAMPAH MENGGUNAKAN PELLETIZER

RANY PUSPITA DEWI — 2025-05-08

Municipal solid waste can be processed into solid fuel in the form of Refuse Derived Fuel (RDF) pellets and used as a fuel substitute. One of them is through the Waste Processing Technology at the Source (TOSS) method. Solid waste generally has a low ash content ranging from 20-40%. RDF is combustible waste or rubbish that goes through a crushing and filtering process by turning it into solid fuel. RDF pellets can be made by pressing using a pellet machine or pelletizer. The aim of this research is to test the characterization of pelletizer performance in processing urban waste into RDF pellets. The characterization tested includes analysis of bound carbon content, volatile content and ash content. The research was carried out by varying the composition of organic waste and inorganic waste, namely 1 sample A (70% organic components + 30% inorganic components), sample B (60% organic components + 40% inorganic components), sample C (50% organic components + 50% inorganic components, sample D (40% organic components + 60% inorganic components), and sample E (30% organic components + 70% inorganic components). The lowest volatile was produced in sample E with a value of 52.8445%, and the lowest ash content was produced in sample A with a value of 4.5466%.

ANALISA EFISIENSI ISENTROPIK PADA ASH REMOVAL COMPRESSOR DENGAN SOFTWARE COMPUTER AIDED THERMODYNAMICS TABLE 3

Muhammad Nizar Ramadhan — 2025-05-08

Steam Power Plant (PLTU) is a plant that relies on kinetic energy from steam to produce electrical energy. One of the components used to run the system in PLTU is an air compressor. In Pulang Pisau Steam Steam Power Plant, Air Screw Compressor is used to meet the needs of compressed air in air instruments and ash removal. This study aims to analyze the isentropic efficiency of ash removal screw compressors 2 and 3 at Pulang Pisau Steam Power Plant by comparing the isentropic value of factory specifications with the isentropic value of actual conditions using Computer Aided Thermodynamics Table 3 (CATT3) software. The method carried out in this study is divided into two, namely taking actual data in the field and calculating data using CATT3 software. The results showed that the average isentropic efficiency value of ash removal compressor 2 is 84% and ash removal compressor 3 is 83% with a range of values of 77% - 89%. From these results, it can be concluded that ash removal compressors 2 and 3 at the Pulang Pisau Steam Power Plant are still working properly.

PREDIKSI TITIK LAS BAJA TULANG KING CROSS MENGGUNAKAN METODE TAGUCHI DI PT. XYZ

Raden Muhammad Rafi Hadiriyanto — 2025-05-11

Welding is a process of combining materials that produces melting at welding temperature, either by applying pressure or without pressure, and using filler metal or without using it. Before the welding process is carried out, it is necessary to place spot welds which aim to hold the previous position during the welding operation. The spot welding process is carried out by placing small lumps of weld on the welding line. Therefore, this research needs to be carried out to determine the effect of the number of spot welds and predict the weld points on king cross bone steel using the Taguchi method. The Taguchi method is used to arrange an orthogonal array for the layout of the experiment. In this method, the experimental results must first be analyzed for accuracy to meet certain conditions. Based on the results of research using the Taguchi method in predicting weld points, it was found that the main factor that most influences the build up setting of Kingcross is the distance between weld points, the second factor is the number of weld points, and the third factor is the length of the weld points.

RANCANG BANGUN PENDINGIN OTOMATIS PADA SAMBUNGAN PLAT BAJA GULUNGAN (HOT ROLL COIL) PASCA PENGELASAN

Abdul Haris Mubarak — 2025-05-12

This research aims to create an automatic cooling device for rolled steel joints (Hot Roll Coil) produced by a nickel processing factory operating in the Morowali Industrial Area. Steel plates in the form of long rolls that are rolled are first welded to connect the steel plates to produce rolls of steel plate that are ready to be marketed. Joining steel using this welding method makes the steel plate hot with a temperature in the range of 100°C-200°C. The temperature of the steel plate after welding must be immediately lowered before rolling, because otherwise the steel joints will come apart and could hamper the production process because the broken plate will have to repeat the welding process from the beginning. The plate temperature required to enter the rolling process is 40°C - 60°C. This research has produced a tool to cool steel joints by automatically spraying the steel joints and succeeded in reducing the plate temperature from 100℃ - 200℃ to a constant temperature of 40℃ - 50℃ according to the required temperature.

ANALISA KARAKTERISASI KOMPOSISI CAMPURAN TANAH LIAT, ALUMINA, KANJI SEBAGAI ALTERNATIF BAHAN ISOLATOR

Sallolo Suluh — 2025-05-12

Abstract

The use of clay is mostly used to make various crafts such as flower vases, jugs and also made into pottery, bricks and roof tiles. The purpose of this study is to determine the effect of the composition of the mixture of clay, alumina and starch on the porosity, density and water content of the heat insulator cylinder. The research method used is an experimental method by making material from a mixture of clay, alumina, starch as an alternative insulator material. A series of processes are carried out in making the material. Furthermore, after the material has been successfully formed, tests are carried out on the water content, porosity, and density of the material. The results showed that the best mixture of clay, alumina and starch was obtained in sample E with a composition of 20% clay, 60% alumina, and 20% starch. The water content, porosity, and density of the mixture were 9.49%; 26.97%; and 1,514.80 kg/m^3

Key words : alumina, insulator, composition, porosity, and starch

PRESTASI POMPA SENTRIFUGAL TIPE OVERHUNG UNTUK APLIKASI INDUSTRI DENGAN METODE REVERSE ENGINEERING DAN CFD

Mohamad Yamin — 2025-05-12

Indonesia faces various challenges in achieving net zero emissions, energy crises, and urgent agricultural irrigation needs. In this context, centrifugal pumps play a crucial role in various industrial applications and irrigation systems. However, performance curve data for pumps is often unavailable, particularly for older pumps or those with lost documentation. This study aims to develop new performance curves for centrifugal pumps using Reverse Engineering (RE) based on 3D scanning and Computational Fluid Dynamics (CFD) simulation. The process begins with geometric modeling of the pump using 3D scanning to obtain accurate data regarding the pump’s physical shape. The model is then used in CFD simulations with the k-epsilon (k-ε) turbulence model and SIMPLE method to analyze flow characteristics and pump performance. Simulation results show that the deviation in efficiency and power compared to existing experimental data is below 2%, with a mesh size of 0.00005 mm providing optimal results in terms of accuracy and computational efficiency. This research demonstrates that developing performance curves using RE and CFD methods can address issues of missing data and provide a solid foundation for design improvements and efficient operation of centrifugal pumps. The findings have the potential to enhance operational efficiency of pump systems and support environmental impact mitigation efforts through pump technology optimization.