http://repository.president.ac.id/xmlui/handle/123456789/17 Mechanical Engineering 2026-04-09T20:40:08Z http://repository.president.ac.id/xmlui/handle/123456789/13403 DESIGN OF PORTABLE HORIZONTAL LATHE MACHINE 100 TON Laksono, Hendro Dwi Dalam industri pembangkitan listrik, efisiensi dan kecepatan dalam perbaikan peralatan sangatlah penting untuk mengurangi downtime dan meminimalisir kerugian finansial. Salah satu permasalahan utama yang dihadapi adalah perbaikan rotor pada pembangkit listrik yang memerlukan proses transportasi ke workshop, yang dapat memakan waktu dan biaya tambahan. Untuk mengatasi tantangan ini, penelitian ini mengusulkan perancangan mesin bubut horizontal portabel dengan kapasitas 100 ton. Mesin ini memungkinkan perbaikan rotor dilakukan langsung di lokasi customers tanpa perlu membawanya ke workshop, sehingga mengurangi waktu pengerjaan secara signifikan. Dari segi perhitungan waktu, jika perbaikan dilakukan di workshop, proses ini memerlukan waktu total sekitar 21 hari, yang terdiri dari perbaikan (12 hari), transportasi (6 hari), dan packaging (3 hari). Sementara itu, jika perbaikan dilakukan langsung di lokasi, waktu yang dibutuhkan hanya sekitar 12 hari, tanpa perlu adanya waktu tambahan untuk transportasi dan packaging. Oleh karena itu, penerapan mesin bubut portabel ini dapat memberikan solusi ekonomis yang lebih efisien dalam industri jasa perbaikan di lokasi unit customers seperti pembangkit listrik, industri perolehan dan gas, manufaktur, semen, pertambangan dan beberapa sektor terkait pemeliharaan mesin berputar. Perancangan mesin bubut horizontal portabel ini mencakup berbagai aspek teknis, termasuk identifikasi kebutuhan, analisa pemilihan material dan hasil dari perancangan. Mesin ini memiliki kapasitas kerja maksimal hingga 100 ton dengan akurasi pemesinan 0,03 mm secara radial dan 0,02 mm secara aksial. Dimensi mesin dirancang agar dapat dimasukkan ke dalam dua kontainer berukuran 20 ft, sehingga menjadikannya mudah untuk dipindahkan dan digunakan dilokasi customers. Proses desain menggunakan perangkat lunak Computer Aided Design (CAD), sementara analisis struktural dilakukan berbasis metode elemen Finite Element Analysis (FEA) untuk memastikan pemilihan material yang dilakukan sudah sesuai dengan yang di inginkan. Dengan penerapan mesin bubut horizontal portabel ini, diharapkan perbaikan rotor dapat dilakukan lebih efisien, mengurangi waktu henti operasional, serta meminimalisir kerugian finansial 2025-01-01T00:00:00Z http://repository.president.ac.id/xmlui/handle/123456789/13402 DESIGN AND ANALYSIS OF A MODULAR BELT WINDER FOR BELT WIDTH ≤ 2400MM X Ø6 METERS WITH A CARRYING CAPACITY OF 50 TONS Febrianto, Pramudya Belt conveyors are material transportation systems widely used in the mining, power generation, and manufacturing industries due to their ability to move large quantities of material efficiently and continuously. This system has replaced conventional methods such as haul vehicles, thereby increasing productivity and reducing operational costs. One of the main challenges in operating belt conveyors is the installation and replacement process of the belts, especially for large-sized belts. This process requires specialized tools such as a belt winder, which functions to quickly, safely, and controllably wind and unwind the belt. This study aims to design and analyze a modular belt winder capable of winding and unwinding conveyor belts with widths up to 2400 mm, diameters up to 6 meters, and a maximum load capacity of 50 tons. The design process includes product benchmarking, selection of local materials, and dimension adjustments according to Indonesian land transportation regulations (Minister of Transportation Regulation No. 60 of 2019). A structured engineering design approach is applied through conceptual design, initial modeling, and mechanical analysis of key components such as shafts, bearings, gears, drive systems, and supporting structures. The design results show that the belt winder has dimensions in the operational configuration of 5,516 × 5,490 × 3,900 mm and in the transportation configuration of 5,841 × 2,400 × 2,990 mm. All components operate within safe stress limits, with a minimum safety factor of 2 for rotating elements and above 6 for the supporting structure. The torque required to wind a 50-ton load is 31.718,93 N·m, with a pump power of 33.18 kW at 1,272 rpm. 2025-01-01T00:00:00Z http://repository.president.ac.id/xmlui/handle/123456789/13401 REDESIGNING THE TEMPERATURE MEASUREMENT SYSTEM IN A STEAM- JACKETED MIXING TANK TO MINIMIZE THERMOCOUPLE SENSOR CALIBRATION FREQUENCY Ginting, Inra Christian This paper is to show that the current work suggests a modification of the temperature measurement system in a steam-jacketed mixing tank by redesigning and changing the position of the sensors for accuracy in temperature reading as well as lesser frequency in calibration. The main issue with the current configuration has been with K-type thermocouples measuring three simultaneous sources of heat: liquid contents inside the tank, condensate, and protective jacket heat. Inaccurate measurement and product failure have resulted from the liquid temperature not well controlled during boiling. Reconfigured to measure only liquid contents, PT100 sensors will replace K-type thermocouples (accuracy: 0.1–0.5°C). I tested the performance of the original K-type thermocouples and the modified PT100 sensors using a comparative test method using liquid as purified water. Six tests were conducted using clean, purified water to guarantee consistent results. I have tested the new PT100 sensors and the results show that they are more accurate (±0.3°C) than the old thermocouple (±2.5°C), almost removing measurement error and temperature-related product defects. With an 88% accuracy rate in liquid temperature readings, stable readings assist avoid product failure and lessen the need for calibration. To increase production efficiency and product quality, other relevant industries should implement system redesigns like to those in the pharmaceutical sector. 2025-01-01T00:00:00Z http://repository.president.ac.id/xmlui/handle/123456789/13400 EFFECTIVITY OF NICKEL-BORON PLATING USING ELECTROLESS METHOD TO REDUCE THE CORROSION RATE OF A36 CARBON STEEL Chandranita, Pingkan Kirana This study aims to analyse the effectivity of nickel-boron coating using the electroless method on A36 carbon steel’s corrosion rate. The analysis will be based on the result of the immersion test done on every specimen in alkaline, acidic, and salt environments. The alkaline environment will use potassium hydroxide (KOH) with a pH of 9 to 12. The acidic environment will use hydrochloric acid (HCl) on a pH of 3 to 6. Lastly, the salt environment will use sodium chloride (NaCl) in a concentration of 3%, 5%, 7%, and 10%. The result shows that electroless nickel-boron plating successfully reduces the corrosion rate of carbon steel by 29.9% in the alkaline environment, 14.6% in the acidic environment, and 17.8% in the salt environment. 2025-01-01T00:00:00Z