Mahros Darsin
Jember University, Indonesia, Mechanical Enginering, Faculty Member
- Universitas jember, Teknik Mesin, Faculty Memberadd
- I am an academic staff at Mechanical Engineering, University of Jember Indonesia. My PhD degree was gained from Auckl... moreI am an academic staff at Mechanical Engineering, University of Jember Indonesia. My PhD degree was gained from Auckland University of Technology, majoring in Mechanical Engineering. An MSc degree were previously achieved from University of Portsmouth majoring in Advanced Manufacturing Technology. previously a B.Eng degree was achieved from ITS Indonesia of Mechanical Engineering subject. My research interest are machining, modeling, manufacturing optimization and the related.edit
- Assoc Prof Tim Pasang, Prof Zhan Chen, Prof G.M Bedford, Dr Val Vitanov, Prof I Made Londen Batanedit
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3D printing is a technology that can print an object from a digital file namely computer-aided drawing (CAD), into a real physically object having volume and mass. Currently, some metal-plastic mixed filaments available in the market... more
3D printing is a technology that can print an object from a digital file namely computer-aided drawing (CAD), into a real physically object having volume and mass. Currently, some metal-plastic mixed filaments available in the market place as the fed for the FDM 3D printing, one of which is composed of steel and PLA, called as eSteel. Therefore, it needs to research the mechanical properties of their printed products. This research aims to explore the flexural strength printed products using eSteel. Experiments were design based on Taguchi orthogonal array L4 (2 3). Three control parameters its levels are: extruder temperature (220 o C, 225 o C), layer height (0.3 mm, 0.4 mm), and raster angle (0 o /90 o , 45 o /45 o) are. The specimens are in form of the bending test ASTM D790. Each combination replicated five times using 3D printing machine HE3D K200. S/N ratio analysis and Analysis of variance (ANOVA) revealed that the raster angle had the most important influence on the flexural strength of the product with a contribution of 43.22%, followed by layer height and extruder temperature with a contribution of 24.08% and 12.6%, respectively. S/N ratio analysis proofed that the combination of control parameters to the maximum flexural strength of 39.54 MPa when combining parameters of extruder temperature 220 o C, layer height 0.4 mm, and raster angle 0 o /90 o .
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Application of cutting fluids in machining can improve machinability but it may danger to the environment. An alternative to reduce this bad effect is by using minimum quantity lubrication (MQL). This study aims to determine the most... more
Application of cutting fluids in machining can improve machinability but it may danger to the environment. An alternative to reduce this bad effect is by using minimum quantity lubrication (MQL). This study aims to determine the most optimal parameters in the AISI 4340 steel turning machining process to produce the best surface roughness with MQL conditions. The design method used is the Taguchi orthogonal array L9 ). The combined parameters are depth of cut, cutting speed, method of giving cutting fluid and feed rate. Based on the mean response value, it can be concluded that to get the most optimal results of surface roughness, the parameters are depth of cut 1.8 mm, cutting speed 120.89 m/min, method of giving cutting fluid by MQL method and feed rate 0.122 mm/rev. While the percentage contribution of the feed rate has the largest percentage, namely 57,02% and the cutting fluid method 41,33%.
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Research Interests: Materials Science, Metallurgy, Taguchi Methods, Drilling, Alloy, and 3 moreCarbide, Drill, and Titanium alloy
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Titanium and its alloys are hard materials, wear resistant, high strength to weight ratio. Therefore this material become very promising, especially in aerospace application. However, its application restrict when face machining... more
Titanium and its alloys are hard materials, wear resistant, high strength to weight ratio. Therefore this material become very promising, especially in aerospace application. However, its application restrict when face machining processes. This material is very hard which is very difficult to manufacture by machining. Its low Youngs modulus tends to springy and creates vibration or chatter. Moreover, it has low heat dissipation rate that make the heat concentrate in the tool tip especially in the friction surface between tool and chip. Those phenomena result in very low tool life and low quality of machined surface, in term of surface roughness, surface integrity. This article describes some efforts to overcome those problems. Categorically, there are some groups of effort, i.e. varying machining parameters, modification the tool, treatment of the material, and different method of applying the coolant. It seems that using cryogenic cooling upon the tool is the most promising new technology to machine the titanium alloy.
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Multi-item time series prediction using autoregressive integrated moving average and long short term memory on perishable products
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Machinability is a measure of how easy a material to be machined. It can be assessed in some aspects: surface roughness and surface integrity of the machined parts, cutting speed, forces that work during machining or energy consumption,... more
Machinability is a measure of how easy a material to be machined. It can be assessed in some aspects: surface roughness and surface integrity of the machined parts, cutting speed, forces that work during machining or energy consumption, tool life, and chips formation. This article describes the machinability from tool deterioration perspective of titanium alloy 6246 by drilling with TiAlN PVD-coated carbide tools. Taguchi L18 was employed to design the experiments, with five parameters influenced the tool deterioration with mixed levels of parameters of 2 and 3. The tool deterioration was grouped into 3 categories: built-up edge (BUE), delamination, and chipping. Every drill bit was used for single drilling and then observed with SEM from flank and rake view. Wear was not found in this research, however, the tool delamination and tool chipping was evidenced, even if drilling depth was only 10 mm. Tool experienced built-up edge in the outer blade, inner blade and at the chisel. This BUE can be seen at both views, i.e. rake and flank sides. BUE is the most dominant deterioration and inevitably in drilling this alloy, regardless of the parameters applied. Tool delamination may occur during mechanism of peeling off the BUE. While chipping was related to higher feed rate, that may relate to high MRR. Data analysis using Minitab 19 shows that combination of drilling without cooling, 45 mm depth, cutting speed of 27 m/min and feed rate of 0.08 mm/min would result in the best performance of TiAlN tool for drilling Ti6246 heat treated 870oC then followed by water quenching.
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....................................................................................................................... ii Acknowledgements... more
....................................................................................................................... ii Acknowledgements ..................................................................................................... iv List of Publications ..................................................................................................... vi Table of
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Mobil listrik merupakan kendaraan yang digerakkan oleh motor listrik, motor listrik memperoleh daya dari listrik yang tersimpan pada baterai. Chassis merupakan komponen yang penting pada mobil listrik. Chassis merupakan bagian dari mobil... more
Mobil listrik merupakan kendaraan yang digerakkan oleh motor listrik, motor listrik memperoleh daya dari listrik yang tersimpan pada baterai. Chassis merupakan komponen yang penting pada mobil listrik. Chassis merupakan bagian dari mobil listrik yang berfungsi sebagai penopang sistem dalam mobil listrik, pada chassis terdapat tegangan maksimal dan minimal yang disebut tegangan prinsipal. Tegangan prinsipal ini menjadi referensi untuk menentukan keamanan dari chassis. Sehingga perlu mengetahui tegangan prinsipal pada chassis. Proses pengujian menggunakan dua driver yang masing – masing berat driver adalah 45 kg dan 56 kg. Pengujian dilakukan pada tiga titik yang berbeda pada chassis mobil listrik. Dari hasil pengujian tegangan prinsipal yang terjadi yaitu masing – masing σ1 = 3,3282 MPa dan σ2 = 1,5429 MPa pada driver 45 kg dan σ1 = 3,8233 MPa dan σ2 = 2,1123 MPa pada driver 56 kg. Tegangan prinsipal pada chassis masih dalam kondisi aman dikarenakan tidak melebihi tegangan lu...
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Multi-item time series prediction using autoregressive integrated moving average and long short term memory on perishable products
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3D printing technology based on the extrusion material method is rapid manufacturing and has complex accuracy, which supports industrial progress. The selection of printing material (filament) is essential in obtaining mechanical,... more
3D printing technology based on the extrusion material method is rapid manufacturing and has complex accuracy, which supports industrial progress. The selection of printing material (filament) is essential in obtaining mechanical, chemical and thermal properties. In this study, the use of ABS and PLA combination is an innovation in the selection of filaments to minimize environmental pollution and improve the mechanical properties of printed products. In addition, implementing print parameters in printed products can affect mechanical properties. In this study, the infill pattern parameter was used as a variable to increase the flexural strength value by performing a bending test on the ASTM D790. Eight types of infill patterns have been tested with the result that there is an increase in the flexural strength value (in per cent) using the infill pattern archimedean chords (20.72%), concentric (14.02%), cubic (11.66%), Hilbert curve and honeycomb (5.7%). There is a decrease in flexural strength value (in per cent) using the infill pattern gyroid (4.34%), rectilinear (18.57%) and octagram spiral (21.29%). The analysis of the shape of the fracture is supported in determining the flexural strength of 3D printed products.
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Composites are made of multiple materials that are combined to create new materials with better properties. The purpose of this study is to determine the effects of SiC and Cu weight fractions on hardness, tensile strength, microstructure... more
Composites are made of multiple materials that are combined to create new materials with better properties. The purpose of this study is to determine the effects of SiC and Cu weight fractions on hardness, tensile strength, microstructure and Scanning Electron Microscopy (SEM) of Al 6061 composites. The manufacturing method used for creating composites in this study was stir-casting. Each composite component and its functions are as follows: aluminum 6061 as the matrix, silicon carbide (SiC) as a reinforcement, and copper (Cu) functions to improve the characteristics of the composite. Variations were made by weight composition of SiC (1%, 3%, and 5%) and Cu (5% and 8%). Observations were carried out on their hardness, tensile strength, and microstructure; each of which using Rockwell hardness test B (ASTM E 18 standard), a multipurpose tensile testing machine, and SEM, respectively. The results of this study indicate that the addition of SiC and Cu affects the aluminum 6061 characteristics. The best result of the hardness test was shown at Al6061 + 5% SiC + 8% Cu (109.37 HRB). The best Ultimate Tensile Strength (UTS) test result was shown at Al6061 + 5% SiC + 8% Cu (211.8 MPa) with elongation number of 2.8%. There has been a significant reduction in grain size under micro observations that occurred very well but was still relatively not uniform. The result of several SEM observation phases formed by the combination of Al6061 and the addition of 5% SiC + 5% Cu and 8% Cu showed an observation phase of AlZnMgCu, α (Al) + AlZnMgCu, Al2Cu, and Al2CuMg.
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3D printing technology, also known as additive manufacturing, is one of the prototyping systems for creating 3-dimensional models (prototypes). One of the most frequently used techniques is FDM (Fused Deposition Modelling) due to its... more
3D printing technology, also known as additive manufacturing, is one of the prototyping systems for creating 3-dimensional models (prototypes). One of the most frequently used techniques is FDM (Fused Deposition Modelling) due to its simple working principle of melting the filament material and then extruding it. However, the price of filament used in 3D printing is still quite expensive, especially filaments with a mixture of metals. This study attempts to fabricate filament made of PLA and brass using a self-made extruder machine. The success criteria are determined by the precision of the filament and its strength. The accuracy of the printed filament was measured using a 0.01 mm micrometre, while strength was measured using the pull-out test. Three parameters were used: barrel temperature, material composition and roller speed, with two levels each. Taguchi L4(23) was used to design the experiments, followed by S/N ratio analysis and ANOVA. The results showed that on the dimensional accuracy, the influential parameters were temperature and roller speed, for the optimal parameter level at a temperature of 95oC, composition 10/30 g, and roller speed 3.02 mm/s. As for the single filament tensile test, the parameters that affect it are temperature and composition. For the optimal parameter level at a temperature of
100oC, the composition is 10/30 g, and the roller speed is 2.70 mm/s.
100oC, the composition is 10/30 g, and the roller speed is 2.70 mm/s.
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3D printing is a technology that can print an object from a digital file namely computer-aided drawing (CAD), into a real physically object having volume and mass. Currently, some metal-plastic mixed filaments available in the market... more
3D printing is a technology that can print an object from a digital file namely computer-aided drawing (CAD), into a real physically object having volume and mass. Currently, some metal-plastic mixed filaments available in the market place as the fed for the FDM 3D printing, one of which is composed of steel and PLA, called as eSteel. Therefore, it needs to research the mechanical properties of their printed products. This research aims to explore the flexural strength printed products using eSteel. Experiments were design based on Taguchi orthogonal array L4 (2 3). Three control parameters its levels are: extruder temperature (220 o C, 225 o C), layer height (0.3 mm, 0.4 mm), and raster angle (0 o /90 o , 45 o /45 o) are. The specimens are in form of the bending test ASTM D790. Each combination replicated five times using 3D printing machine HE3D K200. S/N ratio analysis and Analysis of variance (ANOVA) revealed that the raster angle had the most important influence on the flexural strength of the product with a contribution of 43.22%, followed by layer height and extruder temperature with a contribution of 24.08% and 12.6%, respectively. S/N ratio analysis proofed that the combination of control parameters to the maximum flexural strength of 39.54 MPa when combining parameters of extruder temperature 220 o C, layer height 0.4 mm, and raster angle 0 o /90 o .
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Multi-item time series prediction using autoregressive integrated moving average and long short term memory on perishable products
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3D printing is a process of making three-dimensional solid objects from a digital file process created by laying down successive layers of material until the object is created. Many filaments can be used in 3D printing, one of which is... more
3D printing is a process of making three-dimensional solid objects from a digital file process created by laying down successive layers of material until the object is created. Many filaments can be used in 3D printing, one of which is PETG (PolyEthylene Terephthalate Glycol). PETG is a modification of PET (PolyEthylene Terephthalate) with added glycol at a molecular level to offer different chemical properties that provide significant chemical resistance, durability, and excellent formability for manufacturing. This study aims to find the most optimal parameter of surface roughness of PETG with different parameters of nozzle temperature, infill geometry, layer height and fan speed. Taguchi L16 (44), with four levels for each parameter, was used to determine the effect of each parameter. Each experiment was repeated five times to minimize the occurrence of errors. Based on the result, the effect of each parameter is nozzle temperature at 4.9%, infill geometry at 5.9%, layer height a...
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3D printing technology or additive manufacturing is manufacturing by adding materials to objects until it is shaped as expected. This technique is easy and cheap for printing polymer-based materials in the form of filament. Recently, some... more
3D printing technology or additive manufacturing is manufacturing by adding materials to objects until it is shaped as expected. This technique is easy and cheap for printing polymer-based materials in the form of filament. Recently, some metal-containing filament has been introduced in the market, one of which is eSteel composed of 45% wt. steel and 55% wt. PLA. Due to its premature introduction, it is a minimal published paper discussing its mechanical properties and dimensional accuracy. This research aims to analyze the dimensional accuracy of 3D printed products of the fused deposition modeling (FDM) technique using eSteel filament. Taguchi method was used to design the experiments with orthogonal array L4 (23). There were three control parameters with two levels each, namely extruder temperature (220°C, 225°C), layer height (0.3 mm, 0.4 mm), and raster angle (0°/90°, 45°/45°). These parameters were selected based on initial trials. The specimens are in the form of an ASTM D790...
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Al-SiC is a composite composed of AA6061 as a matrix and SiC as a reinforcement particle. The variation of mass added will affect the mechanical properties of the composite because Al-SiC is hardenable, which means that its mechanical... more
Al-SiC is a composite composed of AA6061 as a matrix and SiC as a reinforcement particle. The variation of mass added will affect the mechanical properties of the composite because Al-SiC is hardenable, which means that its mechanical properties can be improved by adding the reinforcement component. However, an excessive portion of SiC leads to a decrease in mechanical properties. The purpose of this study was to find the optimal composition of the addition of SiC into the aluminium matrix to gain maximum tensile strength and hardness. The mass fraction variation that would be used in this composite was the addition of 6%, 8%, and 10% SiC with the addition of 1% Mg as a wetting agent. The mixing process used the stir casting method. The process of adding SiC and Mg was carried out by melting the aluminium while stirring it for a certain time before it went to the furnace. The ASTM E8/E8M standard was used for observing the tensile strength of the specimens. Machining was carried out...
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Efficiency and effectiveness are indispensable things in the production process. Accurate use of existing resources and the shorter cycle time of production are of particular concern to optimize the production process. This research aims... more
Efficiency and effectiveness are indispensable things in the production process. Accurate use of existing resources and the shorter cycle time of production are of particular concern to optimize the production process. This research aims to implement automation to a conventional blow molding. An advanced attempt was carried out to use the Internet of Things (IoT) to increase its efficiency while maintaining the quality of the products. The use of the nodeMCU microcontroller and the blynk application allows the operator to operate the machine without having to come into or having direct contact with the machine. The performance of automation and IoT were tested by examining the products using Taguchi design using quality criteria of nominal the best. The efficiency of the system was also considered by comparing the cycle production time. S/N ratio of Taguchi analysis showed that the optimum volume of the bottle would be achieved when applying the temperature, injection time, and hold...
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Molecular dynamics simulation using reactive force field (ReaxFF)potential was implemented to study the oxidation mechanism in aluminium particles with two different alumina shells. That is, without an oxide shell and with a 1 nm oxide... more
Molecular dynamics simulation using reactive force field (ReaxFF)potential was implemented to study the oxidation mechanism in aluminium particles with two different alumina shells. That is, without an oxide shell and with a 1 nm oxide shell. In particular, this research investigated the atomic diffusivity of the system on the oxide shell effect. The results showed that in the heating process, oxygen molecules were adsorbed on the surface of the shell and then diffused to the particle core as the heating temperature increased. The diffusivity of oxygen molecules in the aluminium core which causes the oxidation process to occur, shows that the particles without the oxide shell are faster than the particles with the oxide shell. Although after relaxation, there are similarities in having an oxide shell. However, the thickness is different. This shows that the coating on Al particles can inhibit the rate of oxidation. The thickness of the oxide shell also affects the rate of oxidation.
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Drillability is a term derived from machinability which is applied for drilling. This paper proposes another perspective of drilllability, i.e. form chips formation, a never observed previously for material of titanium alloy 6246. This... more
Drillability is a term derived from machinability which is applied for drilling. This paper proposes another perspective of drilllability, i.e. form chips formation, a never observed previously for material of titanium alloy 6246. This study will broaden the basic knowledge about machinability of this material, which up to this time is barely available. Some parameters that believed to be affecting the drillability were varied: cutting speed, feed rate, depth of drilling, cooling application and heat treatment to the material prior to drilling. The Taguchi method was used for designing the experiments and analysis of variance was carried out to find out the effect of each of parameters towards drillabilty. Degree of segmentation is used to quantify easiness of chips to break. Analysis with Minitab shows that above mentioned parameters affecting the degree of segmentation by 20 %,8.4 %, 3.2 %, 5.8 %, 29.0% respectively. Heat treatments is the most affecting the chips segmentation deg...
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Additive manufacturing (AM) has been trending topic in industrial revolution 4.0. One technique and the most widely used AM is fused deposition modeling (FDM), which uses a melted filament and deposited it layer by layer. The common... more
Additive manufacturing (AM) has been trending topic in industrial revolution 4.0. One technique and the most widely used AM is fused deposition modeling (FDM), which uses a melted filament and deposited it layer by layer. The common filaments used are made of PLA, PP, and ABS, which are available at the online market with variety of prices depend on the quality. It is an advantage if we can make these filaments. In filament manufacturing, the dimensional accuracy is one of the most important factors to comply with the existing 3D printers. The aim of this research is to fabricate a filament made of PP, then assessed the quality based on the accuaray of the targeted diameter of 1.75 mm. The manufacturing process used a self-made plastic extrusion machine. Variations were made on three variables with three levels each. There are (i) heater band temperature with a minimum and maximum range (150/170 oC, 155/175 oC and 160/180 oC), (ii) winding speed (13 mm/s, 16 mm/,s and 19 mm/s), and ...
Seiring kenaikan konsumsi energi minyak dan menurunnya cadangan minyak bumi, maka perlu beralih ke minyak nabati sebagai sumber bahan bakar terbarukan, salah satunya adalah dari biji nyamplung. Biji nyamplung banyak terdapat di desa... more
Seiring kenaikan konsumsi energi minyak dan menurunnya cadangan minyak bumi, maka perlu beralih ke minyak nabati sebagai sumber bahan bakar terbarukan, salah satunya adalah dari biji nyamplung. Biji nyamplung banyak terdapat di desa Kebondalem, Kecamatan Bangorejo, Kabupaten Banyuwangi. Pengabdian masyarakat ini bertujuan mengenalkan potensi minyak nyamplung ke masyarakat desa tersebut. Kegiatan pengabdian dilakukan oleh tim gabungan dosen dan mahasiswa jurusan Mesin, Fakultas Teknik, Universitas Jember. Kegiatan berupa pengenalan potensi biji nyamplung untuk alternative bahan bakar, dilanjutakn dengan peragaan pengepresan biji menjadi minyak. Di sela-sela kedua acara teresbut diselingi tanya jawab dan diskusi. Hasil dari pengabdian ini cukup membuka wawasan warga desa yang hadir akan potensi nyamplung yang selama ini terabaikan. Tokoh masyarakat dan karang taruna siap untuk menindaklanjuti kegiatan ini dengan rencana penanaman lahan hutan desa dengan nyamplung. Perlu arahan dan keg...
Al-SiC is a composite composed of AA6061 as a matrix and SiC as a reinforcement particle. The variation of mass added will affect the mechanical properties of the composite because Al-SiC is hardenable, which means that its mechanical... more
Al-SiC is a composite composed of AA6061 as a matrix and SiC as a reinforcement particle. The variation of mass added will affect the mechanical properties of the composite because Al-SiC is hardenable, which means that its mechanical properties can be improved by adding the reinforcement component. However, an excessive portion of SiC leads to a decrease in mechanical properties. The purpose of this study was to find the optimal composition of the addition of SiC into the aluminium matrix to gain maximum tensile strength and hardness. The mass fraction variation that would be used in this composite was the addition of 6%, 8%, and 10% SiC with the addition of 1% Mg as a wetting agent. The mixing process used the stir casting method. The process of adding SiC and Mg was carried out by melting the aluminium while stirring it for a certain time before it went to the furnace. The ASTM E8/E8M standard was used for observing the tensile strength of the specimens. Machining was carried out before testing. The specimens were also tested for hardness using the Rockwell hardness method. The result shows that the addition of SiC at the amount of 6%, 8%, and 10% SiC increased the ultimate tensile strength by154.10 MPa, 175.01 MPa, and 198.14 MPa, respectively. Similarly, the hardness also increased up to 30.1 HRF, 48.1 HRF, and 66 HRF, respectively. Microstructure observation also confirmed that a 10% SiC fraction results in less defect and good wettability. The addition of 10% SiC and 1% Mg resulted in maximum tensile strength and hardness and the best microstructure.
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Pengecatan adalah proses pelapisan yang diterapkan pada permukaan suatu benda. Tujuan dari pengecatan ada dua, yaitu protektif dan dekoratif. Dari segi protektif cat dapat dinilai dari ketebalan dan jika dari dekoratif cat dapat... more
Pengecatan adalah proses pelapisan yang diterapkan pada permukaan suatu benda. Tujuan dari pengecatan ada dua, yaitu protektif dan dekoratif. Dari segi protektif cat dapat dinilai dari ketebalan dan jika dari dekoratif cat dapat dilihat dari segi kekilapan. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh dari kombinasi parameter yang dapat menghasilkan ketebalan yang maksimum. Desain eksperimen yang digunakan adalah Response Surface Method (Box-Behnken design), 15 eksperimen dengan masing-masing 3 kali pengulangan. Kombinasi parameter dan level yang digunakan yaitu diameter nozzle (1.2mm, 1.3mm, dan 1.4mm), tekanan udara (2bar, 3bar, dan 4bar), dan suhu pengeringan (65oC, 70oC, 75oC). Metode pengecatan menggunakan spray painting dengan 3 kali pelapisan dengan jarak 15cm. Setelah melalui proses pengeringan spesimen diuji menggunakan alat ukur thickness gauge yang memiliki sepsifikasi rentang pengukuran 0-1250µm/0-50mil dengan akurasi±2.5...
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Aluminum and aluminum alloys have properties that are less well when coMPared to steel, such as specific heat and has a high conductivity. They are also easily oxidized and form an aluminum oxide Al 2 O 3 which have a high melting point.... more
Aluminum and aluminum alloys have properties that are less well when coMPared to steel, such as specific heat and has a high conductivity. They are also easily oxidized and form an aluminum oxide Al 2 O 3 which have a high melting point. Consequently, when they are welded the fusion between base and weld metal will be blocked. Moreover, if the cooling process is too fast it will form a smooth cavity ex-pouch of hydrogen. Friction stir welding ( FSW) is a challenging alternative for joining aluminum alloy. In FSW, process occur in the solid state (solid state joining). In this research, some attempts were carried out to find the best quality of welding, in term of mechanical properties and microstructure. Tool rotation speed was varied at 780, 980, 1120 rpm. Whereas, feed rate used was keep constantly at 15 mm/min. The material to be welded is a- 4.0 mm thick aluminum AA 1100 strips. Result showed that the highest strength obtained is 56.528 MPa at 1120 rpm and the lowest strength ob...
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Application of cutting fluids in machining can improve machinability but it may danger to the environment. An alternative to reduce this bad effect is by using minimum quantity lubrication (MQL). This study aims to determine the most... more
Application of cutting fluids in machining can improve machinability but it may danger to the environment. An alternative to reduce this bad effect is by using minimum quantity lubrication (MQL). This study aims to determine the most optimal parameters in the AISI 4340 steel turning machining process to produce the best surface roughness with MQL conditions. The design method used is the Taguchi orthogonal array L9 ). The combined parameters are depth of cut, cutting speed, method of giving cutting fluid and feed rate. Based on the mean response value, it can be concluded that to get the most optimal results of surface roughness, the parameters are depth of cut 1.8 mm, cutting speed 120.89 m/min, method of giving cutting fluid by MQL method and feed rate 0.122 mm/rev. While the percentage contribution of the feed rate has the largest percentage, namely 57,02% and the cutting fluid method 41,33%.
Using cutting fluids in machining with petroleum-based creates health hazards issues to the machining operator and environmental problems due to the waste. One effort to reduce it is by applying minimum quantity lubrication (MQL). This... more
Using cutting fluids in machining with petroleum-based creates health hazards issues to the machining operator and environmental problems due to the waste. One effort to reduce it is by applying minimum quantity lubrication (MQL). This research aims to develop an MQL system with an Arduino controlled based on the previous design. The main hardware was changed, i.e., pump, power supply, nozzle, sensor, and temperature setting changed from 70°C to 150°C. The fluid consumption was measured in machining with a depth of cut of 2.3 mm and 2.5 mm and cutting liquid composition of 3:7 and 7:3 (water to dromus cutting fluid). The calculation showed that cutting fluid consumption is mostly more than 1000 ml/h, or it has not achieved a maximum of 500 ml/h. However, compared to the previous design, it has reduced up to half of the former scenario. From the tool deterioration perspective, the depth of cut of more than 2.0 mm results in severe tool deterioration in the form of chipping. The highe...
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Seiring kenaikan konsumsi energi minyak dan menurunnya cadangan minyak bumi, maka perlu beralih ke minyak nabati sebagai sumber bahan bakar terbarukan, salah satunya adalah dari biji nyamplung. Biji nyamplung banyak terdapat di desa... more
Seiring kenaikan konsumsi energi minyak dan menurunnya cadangan minyak bumi, maka perlu beralih ke minyak nabati sebagai sumber bahan bakar terbarukan, salah satunya adalah dari biji nyamplung. Biji nyamplung banyak terdapat di desa Kebondalem, Kecamatan Bangorejo, Kabupaten Banyuwangi. Pengabdian masyarakat ini bertujuan mengenalkan potensi minyak nyamplung ke masyarakat desa tersebut. Kegiatan pengabdian dilakukan oleh tim gabungan dosen dan mahasiswa jurusan Mesin, Fakultas Teknik, Universitas Jember. Kegiatan berupa pengenalan potensi biji nyamplung untuk alternative bahan bakar, dilanjutakn dengan peragaan pengepresan biji menjadi minyak. Di sela-sela kedua acara teresbut diselingi tanya jawab dan diskusi. Hasil dari pengabdian ini cukup membuka wawasan warga desa yang hadir akan potensi nyamplung yang selama ini terabaikan. Tokoh masyarakat dan karang taruna siap untuk menindaklanjuti kegiatan ini dengan rencana penanaman lahan hutan desa dengan nyamplung. Perlu arahan dan keg...
In the previous study, frame tube design analysis is developed to provide a significant reduction in stress and deformation. This study aims to analyze the frame tube composite design. The design analysis by using FEM software is used to... more
In the previous study, frame tube design analysis is developed to provide a significant reduction in stress and deformation. This study aims to analyze the frame tube composite design. The design analysis by using FEM software is used to model frame tubes with shell elements. The layer angle orientation is set as design parameters. Material is carbon fiber composite (epoxy E-glass UD). Dimension thickness is 2 mm. Seat tube angle 74.5oand head tube angle 70.5o. Load is applied in static condition with weight loading on 80 Kg. Based on the simulation results, thesmallest deformation and stress values occur in the model with a layer orientation angle of [45o, 90o, 90o, 45o] with a deformation value of 0.099556 mm and a stress of 10.016 MPa.
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Pengecatan adalah proses pelapisan permukaan dengan pelapis berbentuk cair dengan tujuan untuk perlindungan dan keindahan. Untuk tujuan keindahan, salah satu tolak ukurnya adalah kekilapan yang dapat diukur dengan gloosimeter dalam satuan... more
Pengecatan adalah proses pelapisan permukaan dengan pelapis berbentuk cair dengan tujuan untuk perlindungan dan keindahan. Untuk tujuan keindahan, salah satu tolak ukurnya adalah kekilapan yang dapat diukur dengan gloosimeter dalam satuan gloss unit (GU). Tujuan dari penelitian ini adalah untuk memeroleh nilai GU optimum dengan memvariasi parameter yang berpengaruh. Eksperimen dirancang dengan metode respon permukaan (RSM) dengan desain Box-Behnken tiga faktor dan masing-masing faktor tiga level. Faktor dan level tersebut adalah tekanan (3 bar, 4 bar dan 5 bar), diameter nozzle (1.2 mm, 1.3 mm dan 1.4 mm) dan suhu pengeringan pada oven pasca penegecatan (55 o C, 60 o C dan 65 o C). Masing-masing kombinasi parameter diulang tiga kali. Mesin cat tipe semprot digunakan dalam eksperimen ini pada material St37. Pengolahan data dengan Minitab 18 menunjukkan bahwa ketiga faktor yang berpengaruh terhadap kekilapan secara urut adalah tekanan, diameter nozzle dan suhu pengeringan. Nilai kekil...
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This activity aims to help the small industry community who make cassava crackers who experience a lack of knowledge on production technology, market expansion and bookkeeping management. To solve the partner problem, it is necessary... more
This activity aims to help the small industry community who
make cassava crackers who experience a lack of knowledge on production
technology, market expansion and bookkeeping management. To solve the
partner problem, it is necessary to make a pressing machine, drying rack
and cassava cracker dough cutting machine whose structure can be made
easily and cheaply for the benefit of cassava cracker crafter and can be
operated simply. A pressing machine with a power source from a hydraulic
machine and a dough cutting machine with power from a 1/2 HP electric
motor, but has the ability to press, dry and cut cracker dough. In the
krupuk craftsman environment, the pressing and chopping processes of
cassava crackers are still done manually with a low / low capacity,
requiring a lot of energy, relatively long time and unhygienic. From this
activity it is targeted that: the manufacture of pressing machines and
cracker dough cutting machines can solve the main problems faced by the
group of cracker craftsmen in Tegalsari sub-district, Banyuwangi district.
The results from the press machine with a moisture content of less than
18% and the results from this cracker dough cutting machine produce a
uniform size with a thickness with a uniform size of 2-3 mm. Thus the
demand for the need for cassava crackers will continue to flow so that it
will increase people's income and will absorb new workers.
make cassava crackers who experience a lack of knowledge on production
technology, market expansion and bookkeeping management. To solve the
partner problem, it is necessary to make a pressing machine, drying rack
and cassava cracker dough cutting machine whose structure can be made
easily and cheaply for the benefit of cassava cracker crafter and can be
operated simply. A pressing machine with a power source from a hydraulic
machine and a dough cutting machine with power from a 1/2 HP electric
motor, but has the ability to press, dry and cut cracker dough. In the
krupuk craftsman environment, the pressing and chopping processes of
cassava crackers are still done manually with a low / low capacity,
requiring a lot of energy, relatively long time and unhygienic. From this
activity it is targeted that: the manufacture of pressing machines and
cracker dough cutting machines can solve the main problems faced by the
group of cracker craftsmen in Tegalsari sub-district, Banyuwangi district.
The results from the press machine with a moisture content of less than
18% and the results from this cracker dough cutting machine produce a
uniform size with a thickness with a uniform size of 2-3 mm. Thus the
demand for the need for cassava crackers will continue to flow so that it
will increase people's income and will absorb new workers.
Research Interests:
This article describes the chips formation during drilling of Ti-6246 titanium alloy using TiAlN coating carbide insert drill. At the early stage of drilling, the chips had a conical spiral shapes regardless the parameters used and heat... more
This article describes the chips formation during drilling of Ti-6246 titanium alloy using TiAlN coating carbide insert drill. At the early stage of drilling, the chips had a conical spiral shapes regardless the parameters used and heat treatment conditions. However, as the depth increases different types of chips were observed depending on the parameters used. Drilling with high feed rates, lower cutting speed and with coolant resulted in segmented-type. On the contrary, low feed rate and high cutting speed result in long-curly chips. Furthermore, when the depth of drilling was around 10 mm or deeper, a zigzag form of chips was observed regardless the machining parameters applied. Though the chips forms were different, cross sectional observation using optical microscopy and scanning electron microscopy shows that all the chips had a serrated type. These chips experienced microstructural elongation at the shear band area. Micro Vickers hardness tests showed that the hardness of the chips was higher compared to the hardness of the original material prior to drilling.
