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Jurnal Nosel
Published by Universitas Sebelas Maret
ISSN : -     EISSN : -     DOI : -
Core Subject : Education, Engineering,
Education Mechanical Engineering
Arjuna Subject : -
Articles 14 Documents
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Search results for , issue "Vol 3, No 1 (2014): July" : 14 Documents clear
ANALISIS PRODUKTIVITAS DAN PERHITUNGAN WAKTU BAKU DI BAGIAN MACHINERY DENGAN MENGGUNAKAN METODE WORK SAMPLING DI UNIT MACHINERY AND TOOL PT.MEGA ANDALAN KALASAN Agustian, Devi
Jurnal Nosel Vol 3, No 1 (2014): July
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Abstract

The purpose of this research is to quantify the productivity and standard time achieved by the operator in the manufacture of objects produced in turning machine C6232B1, CNC Turning machine Doosan Puma GT2100, cutting machine at machinery division PT. Mega Andalan Kalasan by using work sampling method. This research is descriptive quantitative. Research by the work sampling method executable instantaneously at the times specified by the researcher visits. Data collection is carried out by observation, interviews, and direct observation with the operators work activity during productive or idle time.Based on data and results of research analysis gained: (1) Percentage of productivity from  turning machine operator, CNC machine operator, and cutting machine operator are 83.40%, 82.26%, 83.80%. (2) Standard time achieved by turning machine operator are Spindle Luar5,12 minutes, Slider Luar1,16 minutes, Mur Handle Pendorong6,68 minutes, Tutup Boom21,41 minutes, Ring Rangka Depan0,97 minutes, Bush Pipa Pengungkit2,27 minutes, Baut Gulungan Kabel4,97 minutes, As Pengunci1,25 minutes, Dudukan Head And Foot End 2,47 minutes, Alur Tiang Panci 11,42 minutes, Engsel Penompang Betis 2,54 minutes, Handle Ungkit Gasspring Pendek2,04 minutes, As Dudukan Panel3,26 minutes, Sambungan Motor Backraise 3,36 minutes, Mur Castor  6,53 minutes. Standard time achieved by cutting machine operator are Engsel Penompang Betis10,54 minutes, Mur Castor Ms6,56 minutes, Dudukan Motor Backraise6,84 minutes, Rumah Ulir22,39 minutes, Mur Castor Stainless9,56 minutes, Mur Pengungkit Kanan4,43 minutes, Mur Pengungkit Kiri5,09 minutes, Tutup Penompang Betis12,92 minutes, Rumah Tiang Betis11,89 minutes, Sock Pendorong8,14 minutes, Roda15,27 minutes, Slider Luar1,10 minutes, Ulir Pendorong Backrest3,36 minutes, Mur Pengangkat Chasis3,05 minutes. Standard time achieved by CNC machine operator are Porok Castor 8,21 minutes, Baud Engsel Kaki 4,22 minutes, Pin Pengunci 3,91 minutes, Pin Pengungkit 2,43 minutes, Pin Backreise 2,57 minutes, Engsel 7,36 minutes, Pin Roda 2,98 minutes, Pin Motor 2,99 minutes.The average from percentage of standard time differences every operators from turning machine operator, cutting machine operator, and CNC machine operator are 11.73%, 11.5%, and 11.75%. The average is not exceed than company standard tolerance 25%.
PENGARUH TEMPERATUR QUENCH TERHADAP LAJU KOROSI DAN STRUKTUR MIKRO HASIL PENGELASAN BAJA KEYLOS 50 Priatama, Arya Aji
Jurnal Nosel Vol 3, No 1 (2014): July
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Abstract

Medium carbon steels is a material commonly used in the industrial world, application of medium carbon steels often have problems that require welding to repair. Welding causes the corrosion resistance of a metal decreases, so that need for post- weld treated, one of the way with quenching. To get the quenching which has good corrosion resistance, need to know the media and the optimal temperature in the quenching process. In the process of quenching, cooling too quickly can cause the brittle nature of the increases thereby increasing the likelihood of cracking in the material which trigger corrosion. This study aims to: ( 1 ) determine the effect of temperature on the cooling medium flow rate of corrosion of steel welds keylos 50. ( 2 ) determine the effect of temperature on the cooling medium steel weld microstructure keylos 50. This research conducted in Inlastek Welding Institute for the welding process and DIII Mechanical Engineering Materials Laboratory UGM for corrosion testing process. The method used experimental method and the type of study is a quantitative study. The number of samples in this study were 4 pieces with 1 piece details without quenching and 3 samples experienced a variaton temperature of quenching media. Corrosion testing was conducted using a weight loss method  with 3 pieces for each variation, plus 3 pieces of samples of raw materials , so the total samples for corrosion testing there are 15 pieces. Data analysis techniques in this study is a quantitative descriptive analysis techniques. The results of research have showed that the optimum quench temperature influence on the corrosion rate is quenching temperature is 25-30 ° C it was 273.876 mpy corrosion rate decreased by 15.95% compared with the raw material and the worst quench temperature is 5-10 ° C is 389.943 mpy or an increase of 19.67% compared with the raw material. However, the highest level of corrosion rate occurs in welds without treatment or quenching is 397.518 mpy corrosion rate increased by 21.99% compared with the raw material. These results are due to the air cooling quickly so having a micro structure that is dominated by accicular ferrite and ferrite side plate in weld metal region, then bainite and martensite in the HAZ region, while the water media cooling more slowly because of the heat welding is being held back by the water in a bucket.
PENGARUH SUHU TEMPER TERHADAP STRUKTUR MIKRO, KEKERASAN, DAN KETAHANAN AUS BAJA KARBON HQ 709 Surahman, Surahman
Jurnal Nosel Vol 3, No 1 (2014): July
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Abstract

The use of carbon steel HQ 709 as gears, crank shaft, shaft, and engine components in addition to requiring hardness properties also require wear resistance and toughness properties. To get the properties of carbon steel with a combination of hardness, plasticity, ductility, strength, wear resistance, and stable crystalline structure necessary tempering process. Tempering is an attempt to reduce the residual stress of materials with a decrease hardness material. The purpose of the study were : to investigate how the effect of tempering temperature variations to changes in the carbon steel microstructure HQ 709, to investigate the effect of tempering temperature variation to changes in carbon steel hardness HQ 709, to investigate the effect of tempering temperature variation to changes in wear resistance of carbon steel HQ 709, to investigate the interaction between changes in the microstructure, hardness and wear resistance due to the tempering temperature variations. Research using experimental methods and techniques of data analysis using descriptive analysis is to directly observe and then experimental results and determine the results of the study concluded. Based on the results of the study concluded that: there is the effect of tempered temperature variations on the microstructure of steel HQ 709, there is the effect of tempered temperature variation of the hardness levels steel HQ 709. Based on the results of hardness testing, heat treatment specimens obtained average level of the highest hardness at 870 ° C quenched specimens with holding time is 30 minutes for 560.97 VHN and the lowest average hardness of the specimen tempering 650 ° C with a holding time of 30 min 287.4 VHN, there is the effect of tempered temperature variations on the wear resistance of steel HQ 709. Based on the results of testing the wear resistance, heat treatment specimens obtained an average rate of wear of the highest numbers of specimens tempered at 650 ° C with a holding time 30 min at 0.873 × 10-7 mm2/Kg and the average wear rate lowest in quenching the specimen 870 ° C with a holding time of 30 minutes 0.3 × 10-7 mm2/Kg, there is an interaction between changes in the microstructure, hardness, and wear resistance of steel 709 HQ. Such changes have a certain pattern of interaction or relationship.
KORELASI ANTARA KEMANDIRIAN BELAJAR DAN MINAT BERWIRASWASTA DENGAN HASIL BELAJAR PRAKTIK PENGELASAN PADA SISWA KELAS XI SMK MUHAMMADIYAH 3 NOGOSARI TAHUN PELAJARAN 2013/2014 Mustofa, Mustofa
Jurnal Nosel Vol 3, No 1 (2014): July
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Abstract

The objectives of research are (1) to find out whether or not there is a correlation between learning independency and welding practice achievement  at the second grade of SMK Muhammadiyah 3 Nogosari Boyolali, (2) to find out whether or not there is a correlation between entrepreneurship interest and welding practice achievement at the second grade of SMK Muhammadiyah 3 Nogosari Boyolali, (3) to find out whether or not there is a correlation between learning independency and entrepreneurship interest and with welding practice achievement  at the second grade of SMK Muhammadiyah 3 Nogosari Boyolali. The population of research was the second grade of SMK Muhammadiyah 3 Nogosari Boyolali consisting of 66 students. The sample was taken using Proportional Random Sampling. The sample size was determined using Krecjie table. The sample consisted of 56 students. Techniques of collecting data used were questionnaire and documentation. The results of research showed that: (1) there is a positive significant correlation between learning independency and welding practice achievement  at the second grade of SMK Muhammadiyah 3 Nogosari Boyolali,  with p = 0.00 < 0.05, (2) there is a positive significant correlation between entrepreneurship interest and welding practice achievement  at the second grade of SMK Muhammadiyah 3 Nogosari Boyolali, with p = 0.00 < 0.05, (3) there is a positive significant correlation between learning independency and entrepreneurship interest with and welding practice achievement  at the second grade of SMK Muhammadiyah 3 Nogosari Boyolali, with p = 0.00 < 0.05.
ANALISIS RISIKO BAHAYA DAN PERSEPSI MAHASISWA TERHADAP PENERAPAN K3 DI BENGKEL PEMESINAN PROGAM STUDI PENDIDIKAN TEKNIK MESIN JPTK FKIP UNIVERSITAS SEBELAS MARET SURAKARTA Khamdani, Ibnu
Jurnal Nosel Vol 3, No 1 (2014): July
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Abstract

The objectives of research are to investigate: (1) The application of Occupational Health and Safety (OHAS) at the Machinery Repair Shop of the Mechanical Engineering Education, Department of Technical and Vocational Education, Faculty of Teacher Training and Education, Sebelas Maret University. (2) The perceptions of students on the application of OHAS at the Machinery Repair Shop of the Mechanical Engineering Education, Department of Technical and Vocational Education, Faculty of Teacher Training and Education, Sebelas Maret University. (3) The risk of hazards at the Machinery Repair Shop of the Mechanical Engineering Education, Department of Technical and Vocational Education, Faculty of Teacher Training and Education, Sebelas Maret University. The research used the descriptive qualitative method. It was conducted at the Machinery Repair Shop of the Mechanical Engineering Education, Department of Technical and Vocational Education, Faculty of Teacher Training and Education, Sebelas Maret University. The samples of the research are PTM 2011 students as many as 27 who took the Advanced Machinery course. The data of the research were gathered through observation, questionnaire, in-depth interview, and documentation. The quistionnaire were validated by using the correlational test of product moment, and their reliability was tested by using the alpha formula. The validity of the data obtained through questionnaire was examined by using the data source triangulation and the data gathering method triangulation. They were then analyzed descriptively by using the interactive model of analysis claimed by Miles Huberman. The conclusion of research was: (1) The Application of OHAS  were good enough by well-equipped facilities,  however there?s a several lack include the administration of OHAS facilities, health box complexity and an absent-minded students whom not using an APD prepared on machinery repair shop. (2) The perception of students towards the application of OHAS for the components of attitude, knowledge, and action belongs to a high/good category whereas that for the components of the condition for the application of OHAS is classified into low/poor category. (3) The most dominant risk of hazards based on the Failure Mode and Effect Analysis (FMEA) includes noise disturbance, wound caused by metal particles, and breathing disorder caused by dusts.
UPAYA MENINGKATKAN HASIL BELAJAR SISTEM BAHAN BAKAR MENGGUNAKAN METODE DEMONSTRASI PADA SISWA KELAS XI TEKNIK SEPEDA MOTOR SMK MUHAMMADIYAH 1 SUKOHARJO TAHUN PELAJARAN 2011/2012 Saputra, Edwind Valentino
Jurnal Nosel Vol 3, No 1 (2014): July
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Abstract

The objectives of research are (1) This classroom action research conducted aims to improve student learning outcomes in the fuel system lesson in Class XI Motorcycle Engineering SMK Muhammadiyah 1 Sukoharjo. Subjects of the research amounting 29 are students of Class XI TSM-3 SMK Muhammadiyah 1 Sukoharjo Year2 011/2012. (2) The research uses alearning method demonstration, data validity is examined by using triangulation and member check. The class action research uses path of spiral model, it is conducted in 3 cycles. (3) Before the action cycle, preliminary data showed students are less active in teaching and learning activities. This is evident from the replay value is executed before the study, which is only 65.51 % of students who meet their repetitive KKM value of 29 students.This classroom action research to improve learning outcomes by using the method of demonstration has increased. It can be seen from the observations made in the affective, psychomotor and cognitive.In the first cycle increased to 68.96 %,75.86 % second cycle becomes, and the third cycle into 86.20 % of students who meet the KKM value of the number of 29 students.Conclusion the research is a demonstration of the application of learning methods can improve student learning outcomes in subjects Class XI fuel system TSM - 3 SMK Muhammadiyah 1 Sukoharjo.
PENGARUH TEMPERATUR QUENCHING TERHADAP KEKERASAN DAN KETANGGUHAN HASIL PENGELASAN BAJA KEYLOS 50 Rianto, Endro
Jurnal Nosel Vol 3, No 1 (2014): July
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Abstract

Tujuan penelitian ini adalah untuk mengetahui pengaruh temperatur quenching terhadap nilai kekerasan dan ketangguhan pada hasil pengelasan baja karbon sedang dengan pengelasan Shielded Metal Arc Welding (SMAW). Bahan yang digunakan adalah Keylos 50 yang merupakan baja karbon sedang. Sedangkan elektroda yang digunakan adalah baja karbon rendah yaitu E 7016. Setelah proses pengelasan kurang dari 5 detik setelah pengelasan benda didinginkan cepat dalam air dengan variasi temperatur 5? C- 10? C, 25? C- 30? C dan 70? C- 75? C. Kemudian hasil pengelasan diuji tingkat kekerasan dan ketangguhan.  Hasilnya menunjukkan bahwa pendingin air temperatur 5? C- 10? C merupakan yang paling ideal untuk proses quenching. Hal ini dikerenakan pada pendingin air 5? C- 10? C didapat kekerasan HAZ tertinggi yaitu 263,65 kg/ mm2 dan nilai ketangguhan impak tertinggi yaitu sebesar 1,597 Joule/mm2.
PENGARUH VARIASI JUMLAH SALURAN MASUK TERHADAP STRUKTUR MIKRO, KEKERASAN, DAN KETANGGUHAN PENGECORAN PULLEY PADUAN ALUMINIUM AL-SI MENGGUNAKAN CETAKAN PASIR Khoirrudin, Sinung
Jurnal Nosel Vol 3, No 1 (2014): July
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Abstract

Result of cast pulley which better and high quality for mainly manufacture industry absolutely needed, so that the process of casting a nice, efficient, and economical to increase the yield and reduce the waste production. Casting is formed of a material by means of a metal melt and pour into the cavity desire with what we want. The purposes of the research were (1) to investigate the effect of the variation ingate the micro structure as the results of pulley aluminum casting bean using sand molds, (2) to investigate effect of the variation ingate toward the hardness of the results of pulley aluminum casting using sand molds, (3) to investigate the effect of the variation ingate toward the impact strength in the result of pulley aluminum casting using sand molds. This research used experimental method that contains one free variable (variable of the number of channel entering) and three factors of bond variables (micro structure, hardness and strength impact). The object of the research was the result of pulley casting from aluminum ingot Al-1,15%Si, and 2,01%Zn. The data analysis of this research is using descriptive data analysis, which is explaining the result of the research graphically on the table, histogram and micro structure. As the input parameter in data analysis, covers: variation ingate (1 ingate, 2 ingate, 3 ingate) micro structure, hardness, and the strength impact. Based on the research, it can be concluded that micro structure in the pulley aluminum casting with 1 ingate indicate metric Al-Si that has rare granular distance. Si that grouped form would be created large silicon granules phase. Micro structure in the pulley aluminum casting with 2 ingate indicates close Al-Si metric and the Si granule size is smooth. Micro structure in the pulley aluminum casting with 3 ingate shows close Al-Si metric and the size of the Si granules are smooth and spread evenly. The highest hardness result of pulley aluminum is on pulley with 3 ingate, it is 71, 6 VHN, then pulley aluminum with 2 ingate is 63,4 VHN, and the lowest result of the hardness is on the pulley aluminum with 1 ingate, it is 51,4 VHN. The highest result of the strength impact is on the pulley casting with 1 ingate, it is 0,077 J/mm2, then pulley with 2 ingate; it is 0,058 J/mm2, and the lowest result of the strength impact is on the pulley casting with 3 ingate, it is 0,054 J/mm2.
STUDI KESESUAIAN ANTARA KURIKULUM SPEKTRUM 2008 SMK TEKNIK PEMESINAN DENGAN KEBUTUHAN KOMPETENSI DI BENGKEL PEMESINAN DI SURAKARTA Wahnuri, Wahyu
Jurnal Nosel Vol 3, No 1 (2014): July
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Abstract

The objective of this research was to determine the suitability between spectrum curriculum 2008 SMK machinery engineering and competency needed on production engineering workshop in Surakarta. This research belonging to evaluation research used descriptive qualitative research study. The result of this study are : (1) competency profile of production machine operators in production engineering workshop at Surakarta are varieties, from the results of the study can be concluded that the design of DKK and KK Mechanical Machining Skills Competency declared to represent the competencies needed to become a production machine operator. There are several additional competencies that are considered by the industry namely includes personal competence discipline, work ethic, work spirit, enthusiasm for learning, honest, never give up, responsibility, and competence in the field of machining itself. (2) Mapping the suitability of basic competence DKK and KK Competency of Technical Skills Machining with competence profile of production machine operators in production engineering workshop Surakarta declared appropriate. With namely details of DKK Competency Technical Skills Machining declared low of 40.10%, and KK Mechanical Machining Skills Competency declared quite high at 60.72%.
PENGARUH JUMLAH SALURAN MASUK TERHADAP KETANGGUHAN, KEKERASAN, DAN STRUKTUR MIKRO PADA PENGECORAN PULLEY DARI BESI COR DENGAN CETAKAN PASIR Amfrudin, Muhammad
Jurnal Nosel Vol 3, No 1 (2014): July
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Abstract

The objectives of this research are to investigate: (1) the effect of the number of inlets on the toughness in the pulley; (2) the effect of the number of inlets on the toughness in the casting of pulley from gray cast iron; (2) the effect of the number of inlets on the hardness in the casting of pulley from gray cast iron; and (3) the effect of the number of inlets on the micro structure in the casting of pulley from cast iron and sand mold. This research was conducted in the Engineering Material Laboratory of Diploma Program of Vocational School, Gadjah Mada University. Three types of number of inlet were used in the casting of pulley from gray cast iron, namely: one-inlet type, two-inlet type, and three-inlet type by using wheel (ring) gate in the casting inlet system. The parameter of input in the data analysis consisted of the tests on toughness, hardness, and micro structure. The data of this research were analyzed by using the descriptive data analysis in which the results of the experiment were observed directly and analyzed and then the conclusion of this research was drawn. The results of this research are as follows: (1) the toughness of pulley with one-inlet type is higher due to slow congealment in such a way that more ferrite is collected; (2) ferrite has soft and ductile characteristics; (3) the hardness of pulley with three-inlet type is 205.8 VHN which is higher than that of pulley with two-inlet type (201.8 VHN) and that of pulley with one-inlet type (196.8 VHN); (4) the hardness of pulley with three-inlet type is higher due to quicker congealment in such a way that the perlite formed is spread more evenly and the amount of graphite formed is getting smaller; (4) perlite has hard and brittle characteristics. The microstructure of pulley specimen in this research is hard and strong perlite matrix. The structure of graphite and ferrite in the pulley specimen with one-inlet type is greater in amount than that in the pulley specimen with two-inlet type and that in the pulley specimen with three-inlet type. On the basis of the results of the research, a conclusion is drawn that the value of toughness of pulley with one-inlet type is 0.055 J/mm2 which is greater than that of toughness of pulley with two-inlet type (0.053 J/mm2) and that of toughness of pulley with three-inlet type (0.052 J/mm2).

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