JURNAL MESIN TEKNOLOGI
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Pengaruh sudut twist drill terdahap kekasaran dan kebulatan pada proses pemesinan drilling
Full text linkCoolant and twist drill angle is one of the factors that affect the quality of the workpiece. Coolant selection and twist drill angle are useful for reducing hole roughness and increasing drill hole precision. In addition, the coolant must be easily degraded in the environment so that the environment is not polluted. An example of coconut oil is oil that can be degraded in the environment. This study aims to determine the effect of coconut oil (CO) and drill bit angle on the hole and hole precision obtained during the drilling process. In experimental testing, conventional drilling machines are used for test testing. the tests were carried out under various machining parameters, namely spindle rotation speed of 1100 rpm, drill bit angles of 130° and 135°. Based on these parameters, the spindle rotation speed of 1100 rpm and the drill bit angle of 135° is rougher than the drilling results for the spindle rotation speed of 1100 rpm and the drill bit angle of 130°. In addition, the roundness of the drilled holes for a spindle rotational speed of 1100 rpm and a drill bit angle of 130° is more precise than the spindle rotation speed of 1100 rpm and a drill bit angle of 135°
Digital human modeling (dhm) for computer-aided ergonomics analysis in the horticulture industry
Full text linkIn Indonesia, the production of water spinach increased by 9,24% from the last year, which was reasonable because water spinach was one of the most sought-after and popular types of vegetables. The farmers have exposure risk factors of work-related musculoskeletal disorders (MSDs) owing to poor watering of plant workstations using manual methods. This journal aims to explore the application of computer-aided ergonomic analysis and digital human modeling techniques in optimizing the workstations of farmers in water spinach plantations. This paper compares ergonomic scores for body posture farmers before and after improvement. Improvement was done by replacing the manual ball valve with motor operated valve (MOV), controlled (opens and closes) by farmers’ phones. Before and after improvement, body posture farmers are converted to digital human modeling and analyzed by CATIA and RULA analysis tools. The result of this paper comparing before and after improvement results in a percentage reduction in RULA Scores of 75% from a 4 to 1 value
Energy saving analysis using burner /thermal tank and heater electric in the marine fuel oil (mfo) treatment process
Full text linkEnergy savings in Diesel Power Plants (PLTD) have been carried out by comparing the Marine Fuel Oil (MFO) processing process when using a burner/thermal tank and an electric heater. Energy savings are analyzed in this study by calculating the comparison of operational costs, cost efficiency and processing time. The place of research was carried out in one of the Diesel Power Plants in Indonesia, with the object of research being an electric heater and a burner/thermal tank. The research method used quantitative methods in the form of literature study, observation, and field testing. The research was conducted by collecting data on temperature, humidity, and fuel consumption when testing the MFO treatment every 1 hour until the specified temperature was reached 94-96°C. Based on the research results, the processing of MFO using a burner/thermal tank is more efficient in terms of time at the beginning of processing, with a savings of 17.2% and in terms of operational costs more efficient 11.67%. However, after the process continued for 7 days, MFO processing using an electric heater was more efficient in terms of operating costs by 31.87%
Performance Analysis of Dual Fuel Diesel Generator with Variations in LPG Flow Rate and Air Hole Diameter
Full text linkResearch on dual fuel diesel engines has been the main focus, but research on the composition of LPG and air in the intake manifold is still limited. This study aims to analyze the performance of a dual fuel diesel generator set by varying the LPG flow rate and air hole diameter in the intake manifold. The research method applied is experimental with test variables in the form of gas flow rate (1 LPM, 2 LPM, and 3 LPM) and air hole diameter (19 mm, 21 mm, 23 mm, 25 mm, and 27 mm). These test variables significantly affect electrical power and SFC (Specific Fuel Consumption). Analysis was conducted using single factor Anova. The results showed that the addition of LPG gas with variations in flow rate resulted in an increase in power compared to the use of pure diesel, especially at high loads. A significant increase in power occurred at an orifice diameter of 27 mm at an LPG flow rate of 3 LPM, reaching 1548 Watts. The SFC shows that the addition of LPG substituted with diesel is more efficient and effective than using only diesel. The lowest SFC occurred in the variation with an LPG gas flow rate of 1 LPM, at an air hole diameter of 25 mm, which amounted to 0.002721 kg/kWh. In conclusion, this study illustrates the impact of variations in LPG flow rate and air outlet diameter on the performance of dual fuel diesel gensets. The implications of these findings can support the development of more efficient and environmentally friendly engine technology
Brilliability and fracture strength of float glass under static and dynamic loads due to radiation heat
Full text linkIn this research, steady state and thermal crack analysis was carried out on clear glass exposed to heat radiation with different thicknesses. The analysis process is carried out from the thickness of the glass and testing the temperature variation of the glass testing process to find out the maximum temperature limit of radiation exposure until the glass multiplies thermal crack with steady state analysis of the predetermined ideal heat time. The data collection method used in this study was through testing in an oven where data collection was based on the results of a thermal steady state analysis. The increase in temperature per minute from the first minute was 138.4 ⁰C to the 7th minute or the end was 179.3 °C, from the results research states that in the 7th minute the glass has experienced a crack or crack where the crack starts from the side of the glass which is insulated from radiant heat
Design of Low Subsonic Wind Tunnel with Open Return System for Testing Wind Turbines at Low Airspeeds
Full text linkThe The Republic of Indonesia is rich in potential for renewable energy, including abundant wind energy. This study aims to design a subsonic open return wind tunnel for testing wind turbines at low airspeeds. The testing focus includes the evaluation of blade efficiency, bearing performance, and other aspects. Testing at low airspeeds (<5 m/s) is highly relevant to the wind conditions in Indonesia. The design process utilizes Computer Aided Design (CAD), while data collection and analysis are conducted through Computer Aided Engineering (CAE) simulations and theoretical calculations. The wind tunnel comprises components such as contraction, honeycomb, test section, diffuser, and support structure. Airflow over the turbine blades can be observed using smoke visualization in the test section. This research is expected to provide practical contributions to the development of low-speed wind turbines in Indonesia
Effect of Preheat Temperature Variation with Cooling Media on Mechanical Properties in Welding SS400 Steel
Full text linkSS400 material is a type of low-carbon steel with a carbon content of 0.17%. It is recognized as low-carbon steel. SS400 steel is commonly employed in shipbuilding and general construction projects. This study recommends the utilization of SS400 steel in tank manufacturing through the Shielded Metal Arc Welding (SMAW) process. Before the SMAW welding process, specimens undergo a specific treatment involving preheating at temperatures of 100°C, 150°C, and 200°C. Subsequently, after preheating, specimens are welded, followed by immersion in a cooling medium, either well water or SAE 15W-40 oil. The preheating and cooling processes aim to enhance the mechanical properties of the material. Impact testing, tensile testing, and microstructure analysis were conducted to evaluate the effects of these treatments. The research results demonstrate a significant improvement in Impact energy, tensile strength, yield strength, modulus of elasticity, and strain in specimens subjected to preheating and cooling treatment. These findings indicate that the use of preheating and cooling can enhance the mechanical performance of SS400 material, providing positive benefits in construction applications that require increased strength and resilienc
Heat Transfer In Automatic Duck Egg Incubator Using A Light Bulb As The Heater
Full text linkThe egg incubator is an egg incubator equipped with a heater with a special construction so that the heat in the box is not wasted. This study aims to determine the heat transfer in an automatic egg incubator with incubator dimensions of 0.38 × 0.35 × 0.45 m. The research was conducted by collecting data directly to obtain heat transfer values in automatic egg incubators with a heat source from a light bulb. A digital thermometer was used to measure the temperature of the egg incubator. The incubator temperature was maintained at a maximum temperature of 39°C. Radiation heat transfer that occured in an egg incubator with a surface area of 0.92 m² which was coated with aluminum foil with a material emissivity value of 0.07 and an egg incubator temperature of 39°C (312 K) was 34.6 Watt. The conduction heat transfer that occured on the wall of the egg incubator with the thermal conductivity value of aluminum foil, namely k = 0.034 W/mK, was 34.78 Watt. The results of the study by setting the temperature of the incubator room to a maximum of 39oC obtained a hatching success rate with a hatchability of 75%
Material Optimization in the Design of Chuck Hard Jaw Type Zs Size 160 for Cost Savings in Purchasing Parts for Industrial Turning Machines
Full text linkIn the realm of turning machines, a critical component known as the jaw chuck or hard jaw serves as the clamping mechanism for workpieces during machining processes. PT. Atmi Mikael Fortuna (PT.AMF) frequently encounters challenges in replacing these hard jaws, as they rely on importing ZS-160 type hard jaws manufactured by RÖHM, an American product. This replacement process is time-consuming and incurs high costs. The objective of this study is to independently design and manufacture ZS-type hard jaws, with a specific emphasis on reducing costs and replacement time. The collaboration between Politeknik Industri ATMI and PT.AMF involves the design, fabrication, and modification of hard jaws. The modeling process utilizes 3D scanning and Coordinate Measuring Machine (CMM), generating a point cloud that is subsequently cleaned of noise and verified using 3D Solid Work Software. The ARL 3460 machine is employed to identify the most suitable material, resulting in material Nr. 1.6582 (AISI 4340). Trial experiments demonstrate the optimal performance of the manufactured hard jaws, and the independent production yields a significant 28% reduction in time and costs for PT.AMF
Comparative Analysis of Waterwheel Efficiency Using Nozzle and Open Canal on Waterway
Full text linkWater flow in irrigation is a means of obtaining electric power, which is commonly called microhydro. The waterwheel is the main component of the microhydro energy conversion process. The amount of energy converted by a waterwheel depends on the shape of its model, blade shape and the location of the installer. This study aimed to identify the characteristics of optimally efficient waterwheels. In addition to the energy of the place (i.e., the head), the influence of the weight of the water flowing into the blades of the waterwheel must be considered. This study also aimed to determine the effectiveness of mill performance by comparing waterways that use nozzles with those that use open canals. An experimental method was used to design a waterwheel system by testing the efficiency ratio between the nozzle line and the open canal. This test used the following variable water discharge rates: 12 m3/hr, 14 m3/hr, 16 m3/hr, 18 m3/hour and 20 m3/hr. Using the nozzle line with the largest discharge rate of 20 m3/hr, an rpm of 192.7 is produced with a torque of 0.7 Nm. The waterwheel produced 14.13 watts, with an efficiency of 64.75%. A line that used an open channel at the highest discharge rate of 20 m3/hr produced 61.7 rpm with 0.7 Nm of torque and 4.52 watts with an efficiency of 20.71%. The speed of water flow in the nozzle line was faster than in the open canal path, causing the tangential force on the waterwheel to be greater than on the open canal path. Based on these results, it was concluded that the path was the most efficient when using a nozzle