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Contact Name
Nasrul Ilminnafik
Contact Email
jurnal.rotor@unej.ac.id
Phone
+628123290147
Journal Mail Official
jurnal.rotor@unej.ac.id
Editorial Address
Jl Kalimantan 37
Location
Kab. jember,
Jawa timur
INDONESIA
ROTOR: JURNAL ILMIAH TEKNIK MESIN
Published by Universitas Jember
ISSN : 1979018x     EISSN : 24600385     DOI : -
ROTOR merupakan jurnal yang diterbitkan oleh Jurusan Teknik Mesin Universitas Jember yang memuat artikel ilmiah dalam bidang Konversi Energi, Design/Perancangan, Teknik Produksi, Material serta bidang lain yang terkait dengan Teknik Mesin. Semua naskah yang diterima ROTOR diterbitkan secara global dalam bentuk elektronik. Hasil penelitian yang diterbitkan dalam jurnal ini diharapkan dapat menambah khasanah pengetahuan di bidang Teknik Mesin serta menjadikan sarana bagi para profesional baik dari dunia usaha, pendidikan, ataupun peneliti untuk menyebarluaskan perkembangan ilmu pengetahuan dan teknologi di bidang Teknik Mesin melalui publikasi hasil penelitian.
Articles 319 Documents
ANALISIS SIFAT MEKANIK DAN STRUKTUR MIKRO ALUMINIUM PADUAN Al-Mg-Si HASIL PENGELASAN FRICTION WELDING DENGAN VARIASI KECEPATAN PUTAR F.W., Setyawan; Dwilaksana, Dedi
ROTOR Vol 7, No 2 (2014)
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Abstract

All metals can be done, but welding on some metals, especially aluminum alloys with certain hard to do welding . Various ways and development has been carried out to obtain an alternative method which can connect the hard metal welded. Friction welding (friction welding) is one of the solutions to solve difficult problems connecting metal done with fusión welding (welding liquid). Greatly affect the temperature distribution of welding friction welding results, by varying the rotational speed of the obtained heat more evenly. So that welding can be achieved maximal results. From the results of the largest study of tensile strength at a speed of 1169 rpm is 18.67 MPa, while the tensile strength of the lowest rotational speed of 867 rpm is 16.38 MPa. For the highest hardness values contained in the base metal region (Zud) is 114.5 VHN. while the lowest violence occurred in the HAZ (ZPD) is 52.28 VHN. Keywords: friction welding, rotation speed, hardness, Al-Mg-Si
Analisis Kekuatan Tarik dan Tekan Cetakan Pasir akibat Variasi Ukuran Butir dan Kadar Pengikat Pasir Cetak Devianty, Sella; Syuhri, Ahmad; Arbiantara, Hari
ROTOR Vol 7, No 2 (2014)
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Abstract

Molding sand is one the most important thing in sand casting. The weak tensile strength and compressive strength of molding sand causes some defects, such as sand drop and sand inclusion. Therefore this research is done by varying grain size and percentage of binder in molding sand. The purpose of this research was to analyze the tensile strength and the compressive strength of sand mold due to variation of grain size and binder presentation. Each treatment will through tensile strength test and compressive strength test, then the data from the test will be analyzed by using ANOVAfor factorial experiments with SPSS 16.0 and a significance level of 5%. From the research and analysis conducted found that the tensile strength of the molding sand is influenced by the grain size and binder presentation, meanwhile the compressive strength is influenced by the binder presentation but is not affected by the grain size. The highest average value of the sand mold tensile strength is 0.912 N/mm2 and the highest average value of the sand mold compressive strength is 2.7567 N/mm2. Those values are achieved by the use of a mixture of GFN 40-50 AFS silica with a percentage binder as much as 1.5%. Keywords: Molding sand, grain size, binder
PENGARUH PENAMPANG LINTANG PIPA PEMANASAN BAHAN BAKAR DENGAN MEDIA RADIATOR TERHADAP UNJUK KERJA MESINTOYOTA KIJANG 5K Suwondo, Joko; Bunawi, Bunawi; Rubiono, Gatut
ROTOR Vol 7, No 2 (2014)
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Abstract

Fuel temperature has effect due to engine performance. This research is aimed to get the effect of cross section heating area with radiator heat due to performance of gasoline engine. The experiments are conduct in Toyota Kijang 5K gasoline engine. The radiator heat is use to raise the fuel temperature by 8 mm diameter copper pipe. The pipe is varied as round, oval and nearly flat. Fuel flow channel is place in the heat pipe with 900 mm of length which placed at upper tank of the radiator.  The engine rotation speed is varied as 750, 1250, 1750 and 2250 rpm. Unheated fuel is use as a control. The research result shows the agreement that fuel temperature has effect due to fuel consumption. The result also shows that oval pipe has the lowest fuel consumption.   Keywords: fuel temperature, copper pipe, fuel consumption, radiator’s upper tank
ANALISIS KEKERASAN, CACAT LAS, DAN STRUKTUR MIKRO PADA SAMBUNGAN T PADUAN ALUMINIUM 6061 T6511 HASIL GAS METAL ARC WELDING (GMAW) DENGAN VARIASI KUAT ARUS Yoedhawan, Ahmad Jukliv Pandu; Sumarji, Sumarji
ROTOR Vol 7, No 2 (2014)
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Abstract

AA 6061 T6511 is an aluminum alloy with composition Al 96,61 Wt %, Cr 0,04 Wt %, Cu 0,15 Wt %, Fe 0,7 Wt %, Mg 1,15 Wt %, Mn 0,15 Wt %, Si 0,8 Wt %, Ti 0,15 Wt %, and Zn 0,25 Wt %. Gas Metal Arc Welding (GMAW) is a welding process that the energy obtained from an electric arc. Arc welding to occur between the surface of the workpiece with the electrode wire coming out of the nozzle together with the protective gas. GMAW AA 6061 T6511 using filler metal ER 5356 with composition of 0,2% Mn, 0,25% Si, 0,4% Fe, 5,5% Mg, 0,2% Cr, 0,1% Cu, 0,2% Ti, 0,1% Zn, and 0,0003% Be. From a visual test known GMAW process with strong currents 120 amperes generates heat input of 0,504 kJ/mm, GMAW process with strong currents of 150 amperes generates heat input of 0,837 kJ/mm, and the GMAW process with strong currents of 180 amperes generates heat input of 1,168 kJ/mm. From inspection of defects on the surface was found that the results of GMAW are undersize weld, excessive convexity, excessive undercut, overlap, and incomplete fusion. From inspection of surface defects in GMAW welding of AA 6061 T6511 are spherical porosity and wormholes porosity. The area has the highest hardness in the heat affected zone is located at GMAW AA 6061 T6511 180 amperes is equal to 51,33 BHN, the lowest hardness of 24 BHN which is located on the base metal area on GMAW AA 6061 T6511 120 amperes, and microstructure observations show an increase in diameter the highest point on the AA 6061 T6511 from 61 μm after GMAW process 180 amperes becomes 21 μm. Keywords: AA 6061 T6511, Gas Metal Arc Welding, hardness, microstructure, weld defects.
ANALISA PENGENDALIAN PROSES PRODUKSI SNACK MENGGUNAKAN METODE STATISTICAL PROCESS CONTROL (SPC) Sidartawan, Robertus
ROTOR Vol 7, No 2 (2014)
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Abstract

Today the growth of home industries increase rapidly indeed it is very competitive. One of the strategies to gain competitive advantage is to continuously improve the quality of its products. This conditions have to be supported by the implementation of a quality control on the process in order to later be able to produce a product that has high competitiveness. The purpose of this study is to analyze the production process of snacks at home industry whether they are already under statistical control or not and analyze whether the production process meets the specified design or not. The data are used in this study are both secondary and primary data. Primary data was obtained through direct observation and interviews, while the secondary data obtained from the internet, literature, and journals. Here, we use Statistical Process Control as the analytical tool by making X and R control charts and process capability analysis. The results showed that the control of the production process snacks still not reliable production process. This is an indication that the process is in out of control or it is still experiencing irregularities. Process capability ratio, indicating that the process is said to be worth (not capable) and it must be improved. Process capability index, indicating that the accuracy of the process is less, which means that the process can still be improved. Keywords: Statistical Process Control, Control Chart, Process Capability   
¬¬ANALISIS PEMBOROSAN PEMBUATAN SELUBUNG ROLL MILL PADA STASIUN PENGECORAN PT BOMA BISMA INDRA (PERSERO) PASURUAN MELALUI IMPLEMENTASI CRITICAL PATH METHOD (CPM) Islamiyah, Faizatul; Djumhariyanto, Dwi
ROTOR Vol 7, No 2 (2014)
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Abstract

Critical Path Method is one of the network analysis methods are used to plan , schedule and monitor the project . Network consists of EET, LET, and  float . Critical activities are activities that dont have the free time ( float = 0 ) so there should not be delayed,  because it will affect the completion time  of project This study aims to analyze the critical path of the project of making roll mill sheaths , identify waste and its cause on critical activities , and make network s proposal to shorten the project completion time. Based on the research results, the highest score of waste iswaiting, this cause has22.43% score.This waste caused by the delay of material coming , waiting for the previous process, a limited quantity of machines and the operators is limited . After analysis using CPM method and create diagrams of network proposal,the result is production of 4 units roll mill which previously lasted 7 days can be shortened to 6 days with a critical path which must get special attention because if there is  delay in process it will affect to the other working processes which led to the delay in completion of the project. Keywords: Critical Path, EET, LET,
Pengaruh Variasi Holding Time dan Temperatur Paduan Polipropilena (PP) dengan Serat Sabut Kelapa Terhadap Kekuatan Tarik dan Bending Pada Proses Injection Molding A, Nurdin Akbar; Hermawan, Yuni
ROTOR Vol 7, No 2 (2014)
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Abstract

Utilization of composite materials as an alternative to metal materials in the expanding field of engineering. This is because the advantages possessed by Composite materials such as natural fibers into a lighter construction, corrosion resistance, and strength can be designed in accordance with the direction of loading. In this study, the authors make the specimen using coco fiber as a reinforcement of composite and polypropylene as a matrix with the holding time and temperature variations in the injection molding process. The purpose of this study to determine the tensile strength and bending as well as shape analysis and mikroskipis macroscopic fracture that occurs in the specimen by using a camera and microscope test equipment. Variations holding time is 7 seconds, 8 seconds, 9 seconds. Barrel temperature on the injection molding machine used is 180ºC, 190ºC, 200ºC and injection pressure of 7 bar. Of tensile and bending test results it can be concluded that there are significant variations of holding time and temperature on the mechanical properties of the composite strength values ​​were generated. In the holding time and temperature variations, occurring on average values ​​of tensile strength and bending at the highest temperature holding time is 9 seconds 190ºC is 11.42831 N/mm2. and a temperature holding time 8 seconds 180ºC ie 10,584 MPa. Keywords: holding time, temperature, injection molding, tensile strength, bending strength
PENGARUH PUTARAN SPINDEL, GERAK MAKAN DAN SUDUT MATA PAHAT TERHADAP GETARAN BENDA KERJA ALUMINIUM 6061 PADA PROSES DRILLING Hadiyoto, Agung Eko; Mulyadi, Santoso; Djumhariyanto, Dwi
ROTOR Vol 7, No 2 (2014)
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Abstract

Chatter in drilling process due to excitation, both from within and from outside the system but the resulting chatter effect is very dependent on the excitation frequency and the elements of the cheater system itself . This study aimed to determine the effect of spindle speed, feeding rate and tool angle in consideration of aspects of chatter in drilling process. In this experimental design experiments conducted using Drill Machine Model KMR Kao Ming-700DS. Spindle speed used is 136 rpm, 368 rpm and 681 rpm. Feeding used is 0.07 mm/rotation, 0.13 mm/rotation, 0.22 mm/rotation and use a variety of tool angle is 90˚, 100˚ and 118˚. Materials used for the experiment was aluminium 6061. chatter measurement results work material drilling process using a series of chatter test equipment with a number of fully testing is testing 27. Analysis of the data used is the linear regression. From the results of the testing results of the regression equation A = 103.371* (n)0.627* (f )0.581 * (2Kr)1.112 and R-square value 81.6 %. Spindle speed parameter, feed rate and tool angle jointly effect to the chatter of work material in drilling process. Keywords: Drilling, Chatter, Feeding, Spindle Speed
PENGARUH WAKTU AGING TERHADAP KEKERASAN DAN STRUKTUR MIKRO KOMPOSIT Al-Si-Mg/Al2O3 DENGAN METODE STIR CASTING Junus, Salahuddin; Zulfia, Anne; Melisa, Melisa; Mariani, Lilis
ROTOR Vol 7, No 2 (2014)
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Abstract

Aluminum composite needs proper aging period to achieve its optimum mechanical properties through  precipitation hardening process. In this research, alumina (Al2O3) particulate reinforced aluminum alloy 6061 composite which is fabricated by stir casting method, undergoes T6 treatment in 175°C for 2 hours, 4 hours, 6 hours, and 8 hours. Mechanical properties evaluations such as tensile testing, hardness testing,  and wear rate testing; also microstructure and SEM observation are conducted. Research shows that the  optimum  artificial aging period for the aluminum composite is 6 hours in 175°C. Wear rate decreases after T6 treatment  applied. Hardness  increases after T6 treatment applied with aging period of 4 and 6 hours. Tensile strength decreases compared to as-cast composite due  to  formation  of  void  at  interface  when T6 treatment conducted. Manufacturing factors will affect the mechanical properties of composite. Keywords: Aluminum composite, billet Al.6061, T6, aging period, stir casting
ANALISIS OIL MONITORING SEBAGAI BAGIAN PREDICTIVE MAINTENANCE UNTUK UJI KESIAPAN OPERASIONAL BIG DIGGER KOMATSU Taufiq, Ahmad; Finahari, Nurida; Fuhaid, Naif
ROTOR Vol 7, No 2 (2014)
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Abstract

The performances of the equipments are measured by overall equipment effectiveness (OEE). This parameter consists of availability, operation reliability and product quality. Predictive maintenance system focus on measuring the effectiveness and availability of the vehicles used in the production process. The maintenance system usually done its work by analysis the lubrication oil used in parts of the vehicles. The parameters that will be analyzed are commonly consist of two testing procedures. The first is identify the state of lubrication performance, and the second is measuring the viscosity values of oil samples. This study try to developt the further test for the oil samples in the form of analyze the metal concentration consisted in. This procedure is meant to show the rate of part wearing as the basic of concluding the PM process. The alternative method offer maintenance cost optimation by avoiding the sudden breakdown  and prolong the part lifetime. The study is taking two type Big Digger Machine as comparator. The results show that the common PM has conclusion to let the PC 2000 stay in the process meanwhile the PC 4000 facing the overhaul and replacing the spareparts. The metal inclusion testing procedure show that the PC 2000 oil samples have higher metal concentration. It means that the PC 2000 parts need replacement more than PC 4000. The PC 4000 just need the overhaul process. This finding approve that alternative PM give more accurate results than the common. Keywords: oil monitoring, predictive maintenance, metal inclusion testing, big digger engine

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