JURNAL MESIN TEKNOLOGI
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270 research outputs found
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Oxide Inclusions Removal on Microstructure Properties of As-Cast Cobalt-Based Alloys
Full text linkA cobalt-based metal alloying process was conducted with the addition of the non-metallic element boron (B) using vacuum arc remelting (VAR). The process employed a water-cooled copper mold within an argon atmosphere. This research aimed to investigate the resulting microstructure and surface hardness values of the alloy. The metal melting rate during the VAR process was carefully controlled to achieve the desired microstructure and minimize defects, ensuring the production of high-quality alloys post-solidification. The process effectively facilitated the removal of oxide inclusions through flotation during remelting. The resulting alloy exhibited a dendritic microstructure characterized by large grain sizes. The average hardness value obtained for the alloy was 27.53 HRC
Development of a Special Service Tool for Hydraulic Piston Maintenance on Excavator PC 210-10M0
Full text linkExcavators are essential machinery widely utilized in mining, construction, plantation, and other industries. The Komatsu PC210-10M0, a small-sized excavator model, performs critical operations such as material digging and transportation. However, during component overhauls, particularly for the boom cylinder, bucket, and arm, significant challenges arise due to the absence of suitable tools for efficiently removing and installing hydraulic cylinder pistons. The current reliance on generic tools such as screw wrench sets (L-keys) is suboptimal, leading to inefficiencies, increased risks of workplace accidents due to tool slippage, and longer processing times. This study addresses these limitations by employing the Seven Up++ method to develop a specialized service tool specifically designed for hydraulic cylinder piston maintenance. The methodology encompasses three critical phases: Analysis, Solution, and Results, ensuring a systematic and innovation-focused approach. The developed tool securely positions itself on the piston cylinder, utilizing two pins inserted into pre-existing holes on the piston surface. The results demonstrate significant improvements: maintenance processing time is reduced by up to 70%, operational safety is enhanced due to the tool's secure attachment, and labor requirements are halved, with manpower reduced from two operators to one. These findings highlight the tool's potential to optimize maintenance operations and improve overall efficiency in the use of Komatsu PC210-10M0 excavators
The Influence of Nozzle Injection Pressure on Seawater Evaporation Inside an Evaporator Tube
Full text linkIndonesia, the largest archipelagic country in the world, possesses a vast marine area. Despite being surrounded by the sea, many coastal communities in Indonesia lack access to clean water. Seawater distillation presents a viable solution to this scarcity. This process involves separating salt from seawater to produce fresh water. This study aims to analyze the effect of nozzle spray pressure on the evaporation process of seawater to optimize fresh water production. Experiments were conducted using a fogging nozzle with a diameter of 0.3 mm, varying the nozzle pressure at 40 psi, 70 psi, and 100 psi. The data were statistically analyzed to determine the impact of nozzle pressure on seawater evaporation. The results indicate that the highest evaporation occurred at a nozzle pressure of 40 psi, yielding 10 g of condensed seawater, whereas the lowest evaporation was observed at 100 psi, producing 4 g
Assembly of a 9 ton cold storage facility at Masian Grup and Ping Loka Building Sleman Regency Yogyakarta
Full text linkThis study examines the assembly process of cold storage for frozen food business with a capacity of 9 tons. The aim of this research is to design and assemble a cold storage with dimensions of 5 m in length, 2.7 m in width, and 2.7 m in height, capable of storing frozen food products at a temperature of -18°C. The components used for the cold storage machine include a semi-hermetic Bitzer compressor, a fin and tube HD type condenser, and a wongso evaporator. The total cost for purchasing materials and assembly services for the cold storage amounts to Rp 164,776,980, including an 11% value-added tax (VAT)
Design of a Web-based Cold Storage Temperature Monitor with Arduino Uno for Fish Quality Maintenance: Sensor-based Methodology and Innovative Contribution
Full text linkThe development of a web-based cold storage temperature and humidity monitoring device using Arduino Uno aims to monitor room conditions, particularly in cold storage spaces, through a website. This device utilizes DHT11 and DS18B20 sensors, along with the Wemos D1 Mini module, integrated with the Arduino Uno microcontroller. Arduino configuration is performed through an application to send commands to other components. The research was conducted at PT. Indu Manis Gresik, East Java. Data collection and testing were carried out at the specified location. The test results demonstrate the device's efficient operation, transmitting testing data to the associated website. The accuracy of the DS18B20 temperature sensor testing reached 98.8%, while the DS18B20 humidity sensor achieved 99.35%
Study of the Effect of Welding Current Variations on Joint Strength and Microstructure of Cracker Lontongan Chopper Machine
Full text linkWelded joints in machine frame construction are prone to failure due to changes in material properties caused by the influence of heat, as well as the possibility of defects in welded joints. This is especially crucial in constructions subjected to dynamic loads, where the weld joint is a determining factor in the toughness of the material. This study aims to evaluate the microstructure, hardness, and tensile strength by applying variations in welding current in the Shielded Metal Arc Welding (SMAW) process. The research method included an experimental approach and literature study with careful observation. The findings of this study include: 1) The welding current strength significantly affected the microstructure arrangement of each tested specimen. 2) An increase in welding current resulted in an increase in the number and density of perlite structures in the Heat-Affected Zone (HAZ). In addition, an increase in welding current also resulted in an increase in hardness and tensile strength values. The average tensile strength successively increased from 90 A, 100 A, to 110 A, namely 320.11 MPa; 345.33 Mpa; 368.6 Mpa. 3) The results of statistical tests using the F-test on the tensile and hardness tests showed values of 0.023 and 0.040, respectively, indicating a significant difference in the hardness testing process with the application of current strengths of 90 A, 100 A, and 110 A. This research contributes to an in-depth understanding of the effect of welding current strength on the mechanical properties of materials, with important implications for improving the reliability of welded joints in machine construction
Performance comparison of one cylinder combustion engine with variations of compression pressure & octane number gasoline
Full text linkNowadays, automobiles and motorcycles manufacturer produced more powerful and efficient engines. This engine usually has high compression pressure to achieve high performance and economic gasoline consumption. Unfortunately, only few people known that high compression engine requires high octane number gasoline. The aim of this research were to find out the differences of power & torsion output of one cylinder combustion engine which given several compression pressure variances using Pertamax & Pertamax racing gasoline. Dynamometer test has been carried out to find the performance difference of one cylinder combustion engine. The results shown that the highest compression pressure engine (11,8 Kg/cm2) using Pertamax racing gasoline (RON 100) produced highest power output at 7,8 KW with torsion output at 10 Nm. Meanwhile, the lowest compression pressure engine (10 Kg/cm2) using Pertamax gasoline (RON 92) produced lowest power output at 4,2 KW with torsion output at 3,8 Nm
Optimization of Tambourine Kecer Punching Machine with Two Axis Movement System using Trimmer Machine to Improve Efficiency and Product Quality
Full text linkIndonesian traditional arts, such as tambourine art, have become an inseparable part of cultural heritage. In Kaliwot Village Bungah Gresik, the process of making tambourines still relies on manual methods, especially at the stage of punching the kencer with a hand saw. As a result, the tambourine produced has a rough and uncomfortable surface. This research aims to improve the efficiency and quality of tambourine production through the design of a kecer punching machine using a trimmer machine. The experimental research involved designing, manufacturing, and testing the trimmer machine, focusing on the timing of tambourine kencer punching. The types of wood used include mango, jackfruit, and mahogany. The results included a drive engine power of 0.35 kW, a plan power of 0.45 kW, and variations in motor torque: mahogany 0.0197 Nm, jackfruit 0.0215 Nm, mango 0.0184 Nm. The average hollowing time ranges from 9.42 to 13.31 minutes, with a daily production capacity of 35-42 tambourine seeds, depending on the type of wood. Analysis of motor torque showed that higher motor revolutions increased torque during feeding, potentially affecting wood hardness. The conclusion of the study emphasizes that the use of a trimmer machine can increase the efficiency and production capacity of tambourines, making a positive contribution to the craftsmen in Kaliwot Village as well as the preservation of tambourine art as a whole
Pengaruh pendinginan fluida udara terhadap kinerja fotovoltaik dengan variasi laju aliran udara
Full text linkThis research aims to evaluate the influence of using air as a coolant on photovoltaic module's power output and electrical efficiency. Fossil energy, as the primary energy source today, has limited supply and presents challenges in meeting future energy demands. In an effort to address this issue, we conducted tests by implementing an air cooling system using a blower at the bottom of the photovoltaic module. The tests were conducted with varying air flow rates, and the results indicate that the use of air cooling can enhance the power output and efficiency of the photovoltaic module. The average power output increased by 31.66 Watts with an efficiency of 3.52%. However, when the air flow rate increased by 1.5 m/s, there was an average power decrease of 28.9 Watts and an efficiency decrease of 3.22%. These findings demonstrate that air velocity affects the temperature, power output, and efficiency of the photovoltaic module
The Influence of Water Temperature on Seawater Evaporation in the Desalination Process
Full text linkPopulation An increase in population in an area results in an increased demand for clean water. Although water is abundant, about 97% of the water on Earth is seawater, which cannot be consumed directly because it contains harmful substances. Desalination process is used to convert seawater into drinking water by utilizing heat and wind speed. This research explores temperatures of 30℃, 45℃, 60℃, and 70℃ with a wind speed of 2.6 m/s. Data was collected for each temperature variation for 2 hours with records every 15 minutes, aiming to evaluate the effectiveness of evaporation and condensation in the desalination process. The results showed that 70℃ resulted in the highest evaporation (800 grams), although with a condensation rate of 26.25%. Condensate measurements showed a pH of 7.2 and TDS meter readings ranged from 125 to 138 ppm