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PENGARUH MEDIA PENDINGIN (COOLANT) DAN GEOMETRI PAHAT POTONG TERHADAP TINGKAT KEKASARAN DAN MAKROSTRUKTUR PADA PEMBUBUTAN RATA MEMANJANG BAHAN BAJA EMS-45
JMEL : Journal of Mechanical Engineering Learning Vol 12 No 1 (2023): Journal of Mechanical Engineering Learning
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Negeri Semarang

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EMS-45 steel is a type of steel that can be categorized as medium grade steel, which is often applied in the field of industry in various fields of industry. Lathe is a process of forming a workpiece both metal and non metal by reducing the previous size to a specified size. The purpose of this study is to determine the effect of the use of cooling media and chisel geometry on the conventional process of welding and macro photo structure.The method used is the experimental method. Variations used are without cooling medium, 20w50 oil, pure dromus oil without mixture of water and water from faucet, while variation of chisel geometry ie chisel A: cutting angle 10 Â°, free corner 8 Â°, 12 Â° exhaust corner, chisel B: Cutting angle 12 Â°, free angle 9 Â°, 15 Â° exhaust angle, and chisel C: cutting angle 13 Â°, free angle 10 Â° and 20 Â° exhaust angle. After variation treatment on the lathe process, then tested the level of surface roughness and macro photo structure on each specimen. The analysis used is descriptive statistic.Test results yield roughness and macro structure values. The lowest roughness value was obtained in the 5th specimen by 3.18 Î¼m with the N7 roughness and the highest roughness obtained on the 11th specimen at 6.08 Î¼m with the N8 roughness. The macro picture of the structure is most visible on the 5th specimen and the most distant look is on the specimen 11. So it can be concluded that the maximum roughness level that can be obtained from the chime geometry tolerance rate is at its middle value and without using cooling medium.

RELEVANSI LATAR BELAKANG PENDIDIKAN DENGAN BIDANG USAHA WIRAUSAHAWAN (STUDI KASUS PADA USAHA BIDANG TEKNIK MESIN) DI KOTA SEMARANG
Journal of Mechanical Engineering Learning Vol 1 No 1 (2012): Journal of Mechanical Engineering Learning
Publisher : Journal of Mechanical Engineering Learning

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AbstrakTujuan penelitian ini untuk mengetahui ada tidaknya dan seberapa besar relevansi antara latar belakang pendidikan dengan bidang usaha wirausahawan (studi kasus pada usaha bidang teknik mesin) di Kota Semarang. Populasi dalam penelitian ini adalah 124 pengusaha bidang teknik mesin di Kota Semarang. Sampel dalam pe-nelitian ini adalah 43 pengusaha bidang teknik mesin. Analisis data menggunakan uji koefisien kontingensi atau uji chi2 dan deskriptif persentase. Hasil penelitian menunjukan ada relevansi yang tinggi antara latar belakang pendidikan dilihat dari jenis pendidikan formal dengan bidang usaha wirausahawan (studi kasus pada usa-ha bidang teknik mesin) di Kota Semarang.AbstractThe purpose of this study to determine whether or not and how much of the relevance of the educational background of the field of business entrepreneurs (business case studies in the field of mechanical engineering) in the city of Semarang. The population is 124 entrepre-neurs in mechanical engineering in the city of Semarang. The sample in this study was 43 entrepreneurs in mechanical engineering. The analysis using contingency coefficient test or chi2 test and descriptive percentage. The results showed a high relevancy between educational background in terms of the kind of formal education with the business entrepreneurs (business case study in the field of mechanical engineering) in the city of Semarang.

ANALISIS KOMPOSISI CAMPURAN AIR DENGAN LIMBAH KOTORAN SAPI DAN PELETAKAN POSISI DIGESTER TERHADAP TEKANAN GAS YANG DIHASILKAN
Journal of Mechanical Engineering Learning Vol 1 No 1 (2012): Journal of Mechanical Engineering Learning
Publisher : Journal of Mechanical Engineering Learning

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AbstrakTujuan penelitian ini untuk mengetahui pengaruh komposisi campuran kadar air dengan limbah kotoran sapi dan posisi digester terhadap tekanan tertinggi gas yang dihasilkan. Digester terbuat dari galon air mineral 19 liter kemudian diisi slurry sebanyak 9,5 liter. Pengukuran tekanan gas menggunakan manometer U terbuka. Waktu pengamatan dilakukan selama 10 hari. Produksi tekanan biogas paling tinggi pada digester yang diletakkan merebah yaitu 1,095 atm dengan perbandingan kom-posisi campuran air : kotoran = 60 : 40 dan paling rendah yaitu 1,043 atm dengan perbandingan komposisi campuran air : kotoran = 30 : 70. Produksi tekanan biogas paling tinggi pada digester yang diletakkan berdiri yaitu 1,065 atm dengan perband-ingan komposisi campuran air : kotoran = 60 : 40 dan paling rendah yaitu 1,033 atm dengan perbandingan komposisi campuran air : kotoran = 30 : 70. Selisih tekanan antara digester yang diletakkan merebah dengan berdiri rata-rata 0,021 atm. Ber-dasrkan hasil penelitian dapat disimpulkan bahwa komposisi campuran kadar air dengan limbah kotoran sapi yang tepat terhadap tekanan tertinggi gas yang dihasil-kan adalah komposisi campuran air : kotoran = 60 : 40 dan ada pengaruh peletakan posisi digester berdiri dan merebah terhadap tekanan gas yang dihasilkan, dimana yang merebah menghasilkan tekanan gas yang lebih tinggi.AbstractThe purpose of this study to determine the effect of the water content of the mixture composi-tion with cow manure digester and the position of the highest pressure gas produced. Digester made of gallons of mineral water 19 liter slurry is then filled as much as 9.5 liters. Measure-ment of gas pressure using a manometer U is open. When the observations were made for 10 days. Production of the high pressure biogas digester placed at 1.095 atm lay down the composition of the mixture in the ratio of water: dung = 60: 40 and the low at 1.043 atm with a mixture composition ratio of water: dung = 30: 70. Production of the high pressure biogas digester that is placed on a stand that is a ratio of 1.065 atm water mixtures: muck = 60: 40 and the low at 1.033 atm with a mixture composition ratio of water: dung = 30: 70. The difference in pressure between the digester is placed standing leaned average 0.021 atm. Berdasrkan The research concluded that the water content of the mixture composition with cow manure right to the highest pressure of the gas produced is the composition of a mixture of water: dung = 60: 40 and no effect of laying position digester up and leaned against the pressure of the gas produced, where a lie down produce a higher gas pressure.

PENERAPAN MEDIA FILM ANIMASI UNTUK MENINGKATKAN HASIL BELAJAR KOMPETENSI DASAR MENGGAMBAR PROYEKSI
Journal of Mechanical Engineering Learning Vol 2 No 1 (2013): Journal of Mechanical Engineering Learning
Publisher : Journal of Mechanical Engineering Learning

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abstrakTujuan penelitian eksperimen ini adalah untuk mengetahui adanya peningkatan hasil belajar setelah pembelajaran dengan menggunakan media film animasi. Populasi dalam penelitian ini adalah siswa kelas X SMK Negeri 3 Kendal Tahu pelajaran 2012/2013 program keahlian teknik kendaraan ringan. Sampel dalam penelitian ini adalah Kelas TKR 3 (sebagai kelas eksperimen) dan kelas TKR 2 (sebagai kelas kontrol). Pengumpulan data menggunakan metode tes, analisis data menggunakan statistik deskripsi dan uji t. Hasil analisis data menunjukkan bahwa, nilai rata-rata tes awal pada kelompok eksperimen 32,21. Setelah diberi perlakuan dengan media film animasi rata-rata hasil belajar kelompok eksperimen 74,41. Kelompok eksperimen mengalami peningkatan hasil belajar sebesar 42,20. Nilai rata-rata tes awal pada kelompok kontrol 32,79. Setelah diberi perlakuan tanpa menggunakan media film animasi, rata-rata hasil belajar kelompok kontrol 67,35. Kelompok kontrol mengalami peningkatan hasil belajar sebesar 34,56. Hasil uji-t menunjukkan ada peningkatan hasil belajar menggambar proyeksi setelah menggunakan media film animasi.abstractThe research objective of this experiment is to determine the improvement of learning outcomes after learning to use the medium of film animation. The population in this study was a class X student of SMK Negeri 3 lessons Kendal Year 2012/2013 light vehicle engineering program. The sample in this study was TKR Class 3 (the experimental class) and TKR grade 2 (as a control class). Data collection using the test methods, data analysis using statistical descriptions and t test. The results of data analysis showed that the average value of the initial test in the experimental group 32.21. Once treated with the medium of film animation averages the experimental group study 74.41. The experimental group increased learning outcomes for 42.20. The average value of the initial test in the control group 32.79. Having been treated without the use of the medium of film animation, the average yield learning control group 67.35. The control group had increased learning outcomes for 34.56. The results of the t-test showed no increase learning outcomes projected drawing after using the medium of film animation.

IMPLEMENTASI MODEL PEMBELAJARAN JOYFULL LEARNING BERBANTUAN MODUL SMART INTERAKTIF PADA KOMPETENSI DASAR MOTOR BAKAR
Journal of Mechanical Engineering Learning Vol 2 No 1 (2013): Journal of Mechanical Engineering Learning
Publisher : Journal of Mechanical Engineering Learning

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AbstrakPenelitian ini bertujuan untuk mengetahui : (1) hasil belajar kompetensi dasar motor bakar dengan model pembelajaran joyfull learning berbantuan modul smart interaktif apakah lebih baik dibandingkan pembelajaran konvensional.(2) adakah peningkatan hasil belajar kompetensi dasar motor bakar dengan model pembelajaran joyfull learning berbantuan modul smart interaktif. Setelah dilakukan penelitian, diperoleh hasil yang menunjukkan bahwa hasil post-test pada kedua kelompok tersebut mendapatkan hasil rata-rata hasil belajar sebagai berikut rata-rata kelas kontrol 72,39 dan kelas eksperimen mendapat nilai rata-rata 77,31. Setelah dilakukan uji t ternyata terbukti bahwa secara statistik hasil belajar kelas eksperimen lebih baik dibanding hasil belajar pada kelas kontrol. Selain itu berdasarkan uji gain yaitu g kelas kontrol 0,534 dan g kelas eksperimen 0,606, jadi dapat disimpulkan terdapat peningkatan hasil belajar kompetensi dasar motor bakar dengan implementasi model pembelajaran joyfull learning berbantuan modul smart interaktif.AbstractThe goal of the research was to identify : (1) learning result basic competencies combustion engine with joyfull learning model assisted smart interactive module is better than conventional learning.(2) is there an increase learning result result basic competencies combustion engine with joyfull learning model assisted smart interactive module . Having done the research, obtained results indicate that the posttest in both groups are getting the average learning result following control group average 72.39 and experiment group result an average of 77.31. After t test proved statistically that learning results experimental group are better thanlearning result in control group. Also based on the Gain test g of control group was 0.534 and g of experiment group was 0.606, so we can conclude there was an increase in learning result basic competencies combustion engine with the implementation of joyfull learning model with assisted smart interactive module.

PERBEDAAN HASIL BELAJAR K3 MENGGUNAKAN MODEL PEMBELAJARAN TSTS DAN NHT
Journal of Mechanical Engineering Learning Vol 2 No 1 (2013): Journal of Mechanical Engineering Learning
Publisher : Journal of Mechanical Engineering Learning

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AbstrakPenelitian eksperimen dengan rancangan penelitian post-test group design ini bertujuan untuk mengetahui mana yang lebih efektif antara model pembelajaran kooperatif tipe TSTS dengan NHT serta model ekspositori pada materi K3 siswa kelas X TMO SMK Negeri 4 Semarang Tahun Ajaran 2012 / 2013. Siswa kelas X TKR 1 sebanyak 36 siswa diberikan model pembelajaran tipe TSTS, kelas X TSM sebanyak 36 siswa diberikan model pembelajaran tipe NHT dan kelas X TKR 2 sebanyak 35 siswa sebagai kelas kontrol dengan model pembelajaran ekspositori. Analisis data menggunakan uji-F dan uji-t. Hasil penelitian menunjukkan bahwa terdapat perbedaan signifikan pada ketiga kelompok dan penerapan model pembelajaran kooperatif tipe TSTS dan NHT lebih efektif daripada model ekspositori, serta rata-rata hasil belajar siswa pada materi K3 pada model pembelajaran kooperatif tipe NHT lebih efektif daripada tipe TSTS.AbstractExperimental studies with post-test research design group design aims to find out which is more effective between cooperative learning type TSTS with NHT and expository of the material K3 class X TMO SMK Negeri 4 Semarang in Academic Year 2012/2013. Students of class X TKR 1 a total of 36 students are given learning model TSTS type, class X TSM many as 36 students are given learning model NHT type and class X TKR 2 as many as 35 students with a control class expository teaching model. Data analysis using F-test and t-test. The results showed that there were significant differences in all three groups and the implementation of cooperative learning model TSTS type and NHT more effective than expository models, and the average student learning outcomes in the material K3 on the model NHT type of cooperative learning is more effective than the type TSTS.

FAKTOR-FAKTOR KEMUNCULAN TECHNOPRENEUR PADA LULUSAN SMK TEKNOLOGI DI SEMARANG
Journal of Mechanical Engineering Learning Vol 2 No 1 (2013): Journal of Mechanical Engineering Learning
Publisher : Journal of Mechanical Engineering Learning

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AbstrakTujuan penelitian ini : (1) Mengetahui faktor-faktor dari aspek teknis dan mana-jerial yang mempengaruhi kemunculan technoprenueur pada lulusan siswa SMK teknologi di Semarang. (2) Mengetahui faktor-faktor dominan dari aspek teknis dan manajerial yang mempengaruhi kemunculan technoprenueur pada lulusan siswa SMK teknologi di Semarang. Penelitian ini merupakan penelitian deskriptif studi kasus dengan metode pengumpulan data dengan angket. Populasi penelitian ini adalah wirausahawan bidang studi teknik mesin se-Kota Semarang yang berjumlah 43. Sampel penelitian ini adalah: Wirausahawan bidang teknik mesin di Kota Sema-rang yang berasal dari lulusan SMK teknologi yang berjumlah 10 responden. Teknik analisis data yang digunakan dalam penelitian ini adalah deskriptif persentase. Has-il penelitian menunjukan: (1) Faktor-faktor yang berpengaruh munculnya wirausa-hawan di Kota Semarang dari aspek teknis dan manajerial mempunyai hasil yang sama yaitu berasal dari diri sendiri sebesar 70%, faktor keluarga sebesar 10%, faktor sekolah sebesar 20%. (2) Berdasarkan kesimpulan pertama, faktor yang dominan dari aspek teknis dan manajerial pada munculnya wirausahawan adalah diri sendiri sebesar 70%. Jika diperinci lagi dari faktor diri, yang dominan berasal dari minat/motivasi yang kuat.AbstractThe purpose of this study: (1) Determine the factors of the technical and managerial aspects that affect the appearance of the graduates of vocational school students technoprenueur tech-nology in Semarang. (2) Determine the dominant factors of the technical and managerial aspects that affect the appearance of the graduates of vocational students technoprenueur tech-nology in Semarang. This research is a descriptive case study with the questionnaire method of data collection. The study population is a field study mechanical engineering entrepreneur as the city of Semarang, amount 43. Samples of this study are: Entrepreneurs in mechanical engineering from 10 respondents of Semarang technology vocational school graduates. Data analysis technique used in this research is descriptive percentages. The results show: (1) The factors that influence the emergence of entrepreneurs in the city of Semarang on the technical and managerial aspects have the same result that is derived from theirselves by 70%, amount 10% of family factors, school factors by 20%. (2) Based on the first conclusion, the dominant factor of the technical and managerial aspects of the emergence of self-entrepreneurs is 70%. If itemized more of theirselves factor, which comes predominantly from interest or strong mo-tivation.

PENERAPAN MODEL PEMBELAJARAN EXPERIENTIAL LEARNING BERBANTUAN MODUL PADA KOMPETENSI MENGUNAKAN ALAT-ALAT UKUR (MEASURING TOOLS)
Journal of Mechanical Engineering Learning Vol 2 No 2 (2013): Journal of Mechanical Engineering Learning
Publisher : Journal of Mechanical Engineering Learning

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AbstrakPenelitian ini bertujuan untuk membandingkan hasil belajar mana yang lebih baik antara pembelajaran menggunakan model pembelajaran eksperiential learning berbantuan modul dengan model pembelajaran langsung pada kompetensi menggunakan alat-alat ukur (measuring tools) Kompetensi Keahlian Teknik Kendaraan Ringan. Metode penelitian menggunakan eksperimen dengan pre-test and post-test control group design. Populasi penelitian adalah siswa kelas X TKR SMK Negeri 3 Semarang tahun ajaran 2012/2013 yang berjumlah 3 kelas. Pengambilan sample menggunakan teknik cluster random sampling dan terbagi dalam 2 kelompok sampel, yaitu kelas X TKR-1 sebagai kelas ekperimen dan X TKR-3 sebagai kelas kontrol. Pengumpulan data menggunakan tes dan analisis data dengan teknik statistik komparatif. Hasil uji-t data post-test diperoleh thitung = 5,35, pada taraf signifkansi (α) 5% diperoleh ttabel = 2,00, karena t hitung > t tabel maka terdapat perbedaan signifikan antara kelas kontrol dan kelas eksperimen. Hasil penelitian ini menunjukan bahwa penerapan model pembelajaran experiential learning berbantuan modul lebih baik daripada model pembelajaran langsung pada kompetensi menggunakan alat-alat ukur (measuring tools).AbstractThis study aimed to compare the learning outcomes which one is better between learning using experiential learning model-assisted learning modules with direct instructional model on competency using measuring tools (measuring tools) Light Vehicle Engineering Skills Competency. Research using quasi-experimental methods. The study population was a student of class X TKR SMK Negeri 3 Semarang school year 2012/2013, amounting to 3 classes. Sampling using random cluster sampling technique and divided into 2 keompok samples, namely X TKR-1 as experimental class and X TKR-3 as a control class. Using test data collection and data analysis with comparative statistical techniques. Results of t-test from data post-test is obtained t = 5.35, on signifkansi level (α) of 5% is obtained t table = 2.00, because t > ttable then there is a significant difference between the control class and the experimental class. These results indicate that the application of experiential learning model assisted module is better than direct learning on competence using measuring tools.

STUDI KOMPARASI ANTARA MODEL PROBLEM BASED LEARNING DENGAN MODEL PEMBELAJARAN KONVENSIONAL TERHADAP HASIL BELAJAR MATA KULIAH PRAKTIK PEMESINAN
Journal of Mechanical Engineering Learning Vol 2 No 2 (2013): Journal of Mechanical Engineering Learning
Publisher : Journal of Mechanical Engineering Learning

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AbstrakPenelitian ini bertujuan untuk mengetahui hasil belajar mata kuliah praktik pemesinan yang menggunakan model pembelajaran konvensional dan menggunakan model PBL. Penelitian ini merupakan penelitian eksperimen dengan desain Pre test-Post test Control Group Design, menggunakan Check List dan lembar penilaian sebagai alat pengumpul data penelitian. Populasi penelitian adalah mahasiswa PTM Unnes 2011 terdiri dari 103 mahasiswa dan diambil 50 mahasiswa sebagai sampel. Hasil penelitian diperoleh rata-rata post-test kelas eksperimen adalah 70,92 atau meningkat sekitar 18.08 % dan rata-rata kelas kontrol adalah 66,02 atau meningkat sekitar 13,2%. Pada uji hipotesis diperoleh thitung= 2,362 (α = 5%) dan dk = (25+25-2) = 48 diperoleh t(0,95)(48) = 2,01. Karena thitung t (0,95)(48) maka H0 ditolak. Berdasarkan hasil penelitian dapat disimpulkan bahwa hasil belajar yang menggunakan Model Problem Based Learning menunjukan hasil yang lebih baik dibandingkan dengan pembelajaran yang menggunakan Model Pembelajaran Konvensional.AbstractThis research aims to find out the results of an engineering practice learning courses that use conventional learning model and use the model of PBL. This study is an experimental research design with pre-test post test control group design, use the Check List and assessment sheets as a tool for collecting research data. The population of the research was a student at Unnes PTM 2011 consists of 103 students and taken 50 students as a sample. The research results obtained average post-test test class is 70,92 or increased by approximately 18,08% and the average of the control class is 66,02 or an increased by approximately 13.2%. In the hypothesis test is obtained tarithmetic = 2,362 (α = 5%) and dk = (25+25-2) = 48 obtained t(0,95)(48) = 2,01. Because tarithmetic ≥ t (0,95)(48) then H0 rejected. Based on the result of the study can be concluded that the learning outcomes using Problem Based Learning Models showed better results compared with learning conventional use the model of learning.

IMPLEMENTASI PROBLEM BASED LEARNING UNTUK MENINGKATKAN HASIL BELAJAR SISWA PADA KOMPETENSI MENGUKUR DENGAN ALAT UKUR MEKANIK PRESISI
Journal of Mechanical Engineering Learning Vol 2 No 2 (2013): Journal of Mechanical Engineering Learning
Publisher : Journal of Mechanical Engineering Learning

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AbstrakPenelitian ini bertujuan untuk mengetahui apakah ada peningkatan hasil belajar siswa antara penggunaan model pembelajaran langsung dengan model Problem Based Learning. Penelitian ini menggunakan jenis penelitian eksperimen semu dengan pola Pretest-Posttest Control Group Design. Populasi penelitian adalah siswa kelas X jurusan pemesinan SMK Kristen Pedan yang menempuh kompetensi mengukur dengan alat ukur mekanik presisi pada semester genap 2012/2013 yang terdiri dari 3 kelas dengan jumlah 108 siswa. Penentuan sampel diambil dengan metode random, kemudian diperoleh 2 kelas, 1 kelas sebagai kelompok kontrol yang berjumlah 36 siswa dan 1 kelas sebagai kelompok eksperimen yang berjumlah 36 siswa. Kelompok kontrol akan diberikan model pembelajaran langsung, sedangkan kelompok eksperimen diberikan model Problem Based Learning. Berdasarkan hasil penelitian yang diperoleh, bahwa rata-rata hasil belajar kompetensi mengukur dengan alat ukur mekanik presisi pada kelompok kontrol yang semula 43,33 meningkat menjadi 67,08 atau terjadi peningkatan sebesar 23,75%. Sedangkan pada kelompok eksperimen rata-rata hasil belajar yang semula 43,61 meningkat menjadi 76,67, sehingga terjadi peningkatan sebesar 33,06%.AbstractThis study aims to determine whether there is an increase in student learning outcomes between the use of direct instructional model with a model of Problem Based Learning. This study uses a quasi-experimental study with a type of pattern pretest-posttest control group design. The study population was a tenth grade student majoring in SMK Kristen Pedan machining that taking competence measure with precision mechanical measuring devices in the second semester of 2012/2013 which consists of 3 classes by the number of 108 students. The samples taken by the random method, then gained 2 classes, 1 class as a control group numbering 36 students and one class as the experimental group, amounting to 36 students. The control group will be given a direct instructional model, while the experimental group was given the model of Problem Based Learning. Based on the results obtained, that the average competence measure learning outcomes with mechanical precision measuring tools in the control group increased to 43.33 originally 67.08 or an increase of 23.75%. Whereas the experimental group average learning outcomes which originally rose to 76,67 43,61, resulting in an increase of 33.06%.

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