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DESAIN PROFIL GIGI RODA GIGI LURUS DENGAN SISTEM KOORDINAT Sirod Hantoro; Tiwan Tiwan
Teknoin Vol. 11 No. 1 (2006)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v11i1.93

Design of tooth profile for the big gear enough usually unlike small gear. Process of tooth making is different. The small gear, its tooth making use the machinery process by cutter module, while for the big gear is making to the casting process. One of the method able to be applied in big design gear by using coordinate system. Intention of design of diametrical tooth profile with the coordinate systems is to fulfill the big gear ordering requirement. This method is very benefit to all designer in industry because can be easier in big tooth profile making, so that can fulfill the customer needs. Form the tooth profile for spur gear of coordinate systems with the pressure angle 20 is very good and have sturdy at root tooth. By that is suitable used for big force and low rotationKeywords : Tooth profile, cicloide, evolvente, coordinate systems

Diffusion Bonding Material Tungsten-Baja dengan Interlayer Ag-4% Cu Sirod Hantoro; Tiwan Tiwan
Teknoin Vol. 10 No. 1 (2005)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v10i1.694

The objective of this research is to study the implementation diffusion bonding process on tungsten and low carbon steel system with interlayer Ag-4% Cu, as well as investigate the influence of process parameters such as temperatur, initial pressure and heating time to the shear strength of the joint. Based on the result of shear test, initial pressure 48-144MPa has positive effect to the shear strength. Likewise by improving temperature of heating, it will improve the shear strength. The optimal shear strength is obtained at the temperature 9500C with maximal shear strength is 165 MPa and its bonding ratio 85%. The temperature 9500C and pressure of 144 MPa diffusion bonding has been successfully done with the heating time of 15 minute.Optical and stereomicroscopy on fracture surface after shear testing of the samples reveal tran granular fracture occur at the interlayer. Microstructure analysis at the interlayer reveals in variation microstructure as function of temperature, initial pressure, and heating time. The thickness of interlayer decrease with increasing the temperature, initial pressure and heating time. Other wise, the thickness of grain boundary and second phase area increase with the increasing the temperature, initial pressure and heating time. Based on the SEM/EDS examination, the element of Fe has the dominant distribution. There is accumulation of the element Fe on the limit area with tungsten. The distribution of the element of W, Ag and Fe increase with the increasing the heating time. Diffusivity of some atoms has been calculated based on SEM data at the interlayer. At 9500C, the diffusivity among the element of atom namely are D Ag to Fe= 0,00195 m2s-1, D Fe to Ag=0,02364 m2s-1, DAg to W=0,0061 m2s-1 , and DW to Ag= 0,025034 m2s-1.Keywords: Diffusion Bonding, material, Tungsten, steel, interlayer.

Kemampuan Mahasiswa dalam Memilih Material pada Pembuatan Karya Teknologi Tiwan Tiwan
Jurnal Pendidikan Teknologi dan Kejuruan Vol 22, No 1 (2014): (Mei)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

The objectivesof this study were to analyze the approaches applied by the studentstodetermine the type of materials, to examine the type of materials widely used by the students, and to assess the students’ accuracy in determining the type of materialsto produce technological works. This study was categorised into ex post facto study conducted at the Department of Mechanical Engineering Education, Faculty of Engineering, YSU. The samples were 139 students with39 units of machines. The data was obtained using documentation by examining the reports and the surveysof the developed technological works. The data was analysed descriptively. The results showed the students havethe ability to consider the criteria of materials selection based on materials science, including strength, usage, fabrication, availability and prices. The type of materials widely used is metal as follows: carbon steel, alloy steel, cast iron, stainlesssteel, aluminum and copper. The carbon steel is the most widely used material utilized by 62% of the students.There was36%of the components developed usinginaaccurately selected materials.

PENERAPAN PEMBELAJARAN SEMI RISET UNTUK MENINGKATKAN PEMAHAMAN MAHASISWA TENTANG SIFAT-SIFAT BAHAN TEKNIK PADA PEMBELAJARAN BAHAN TEKNIK DASAR Tiwan Tiwan; Arianto Leman S
Jurnal Pendidikan Teknologi dan Kejuruan Vol 21, No 3 (2013): (Mei)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

ABSTRACTThe purposes of the research are to review the application strategies of semi-research learning on the students’ understanding of the characteristics of engineering materials and to reveal the role of the students. Also, to determine whether there was any significant difference on the students’ understanding whowere taught by using semi-research learning compared to the conventional one. The research method was quasi-experimental model with parallel or equivalent group, the experimental group and the control group. Each group got pretest before and posttest after the treatment. The study was conducted in Mechanical Engineering Department, Faculty of Engineering, Yogyakarta State University from September till November 2012 among 160 students of the first semester in academic year of 2012-2013. This study was using cluster sampling method by taking one class as control group and one class for experimental group. Data analysis techniques were using descriptive analysis and T-Test. Semi-research learning for the understanding on the characteristics of engineering materials can be conducted through the students’ research assignment. The students were given chance to review based on the literature and to prove through their autonomous research. After they completed their research process, they were asked to have presentation while the lecturer role as the facilitator. Most of the students were glad with this strategy because it made them as active learner to search, explore, prove and utilize their review. This learning model demanded the students to be active, independent, serious, and able to work together, to solve problems based on facts as well as scientific evidence. Also, there was significant difference on the students’ understanding of the characteristics of engineering materials, who were taught by using semi-research compared to the conventional method with the score of mean difference of 10 from 0-70 scale. Similarly, there was a difference from the mean improvement of 10 points. Keywords: Semi-research,students’ understanding of nature of engineering materials

Pengembangan Media Pembelajaran pada Kompetensi Dasar Membaca Gambar Menerapkan Sistem Koordinat Berbasis Adobe Flash Rika Dewi Indriyani; Tiwan Tiwan; Dwi Rahdiyanta
Jurnal Dinamika Vokasional Teknik Mesin Vol. 2 No. 1 (2017): April
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v2i1.13500

This research aimed to design and assess the feasibility of Adobe Flash aided learning media for CNC Turning subject, specifically for the coordinate system topic. The research was a research and development study using the Four-D models of development. Four-D model consists of 4 steps, namely define, design, develop, and disseminate. The instrument being used on this research was closed questionnaires with 4 choices Likert scale. The questionnaires were validated by expert evaluation. Data were collected from the 32 respondents. Data, which were quantitative and qualitative, were analyzed using descriptive analysis technique. The result shows that the learning media meets the teachers' and students' needs and expectation. For the feasibility level, the contents expert gave an average score of 3.37 which can be categorized as "very good". The expert in media gave an average score of 3.45 which is in the "very good" category. The Teacher of the respective subject gave an average score of 3.38 and is categorized as "very good". Students respond well with a score of 3.47 were given, which can be categorized as "very good". Tujuan penelitian ini adalah merancang media pembelajaran berbantuan adobe flash untuk mata pelajaran CNC Turning dengan sistem koordinat. Penelitian ini merupakan penelitian pengembangan dengan model pengembangan Four-D Models yang terdiri dari 4 tahap yaitu define, design, develop, dan disseminate. Instrumen yang digunakan berupa angket dengan skala Likert 4 pilihan jawaban. Angket divalidasi oleh ahli evaluasi. Pengambilan data dilakukan kepada 32 responden. Data kualitatif dan kuantitatif yang diperoleh dianalisis menggunakan teknik analisis deskriptif. Hasil penelitian menunjukkan bahwa media pembelajaran yang dikembangkan telah disesuaikan dengan kebutuhan dan tuntutan dari guru dan siswa. Tingkat kelayakan media pembelajaran menurut ahli materi mendapatkan rerata nilai sebesar 3,37 dengan kategori "sangat baik". Hasil validasi ahli media memperoleh rerata nilai sebesar 3,45 dengan kategori "sangat baik". Hasil validasi guru pengampu memperoleh rerata nilai sebesar 3,38 dengan kategori "sangat baik". Berdasarkan penilaian respon siswa diperoleh rerata sebesar 3,47 dengan kategori "sangat baik".

Tungku Krusibel dengan Economizer untuk Praktik Pengecoran di Jurusan Pendidikan Teknik Mesin FT UNY Arianto Leman; Tiwan Tiwan; Mujiyono Mujiyono
Jurnal Dinamika Vokasional Teknik Mesin Vol. 2 No. 1 (2017): April
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v2i1.13496

This research was aimed at developing economizer on aluminum crucible furnace to improve the furnace's performance. The research implements a Research and Development method. The economizer effects was determined from the performance test. The furnace were being tested with and without economizer at the same process condition. The developed furnace exhaust have the same diameter with the gas burner inlet. The exhaust was extended and curved to serve as an economizer. Aluminum of 11.78 kg can be melted with the economizer effects in 60 minutes, and only required 2.6 kg of LPG, whereas without economizer it required 3.1 kg LPG in 80 minutes for the same amounts of Aluminum. Penelitian ini bertujuan menambahkan economizer pada tungku pelebur aluminium untuk memperbaiki performa tungku. Metode Research and Development diterapkan untuk pengembangan tungku. Efek penggunaan economizer ditentukan dari uji kinerja. Tungku diuji coba tanpa dan dengan economizer pada kondisi proses yang sama. Saluran buang pada tungku berdiameter sama dengan saluran masuk. Saluran dibuat memanjang dan berbelok berfungsi sebagai economizer. Aluminium 11,78 kg dapat dicairkan memakai economizer dalam 60 menit dan membutuhkan 2,6 kg gas LPG, sedang tanpa economizer membutuhkan 3,1 kg gas LPG dan waktu 80 menit.

Penerapan Perangkat Praktik Pengecoran Aluminium pada Mata Pelajaran Teknologi Mekanik Untuk Siswa SMK Tiyas Dwi Setiawan; Tiwan Tiwan; Arianto Leman
Jurnal Dinamika Vokasional Teknik Mesin Vol. 2 No. 1 (2017): April
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v2i1.13501

This article presents the application of aluminum casting foundry practice equipment in SMK N 1 Magelang and the evaluation of the learning achievement. The research methods being used was quasi-experiment with Pretest-Posttest Control Group Design. The population of this research was all of the 126 X grade students of Machining department. The sampling using the incidental sampling methods resulting in the choice of MC and MA class, each having 31 students as samples. MC class was selected as a control group and MA was class selected as the treatment group. Data collection was carried out using observation and test and then analyzed using Sign Test. The experiment resulted in 30 students of the treatment group passed the minimum mastery criteria (score 75), while for the control group it is only 10 students. The learning achievements of the treatment group in average was 82.78 which is higher than the control group with an average of 72.43. The increase in the average learning achievements for the treatment group is 37 % while for the control group is 25 %. Penelitian ini bertujuan untuk mengetahui perbedaan prestasi belajar siswa yang menggunakan perangkat praktik pengecoran aluminium pada mata pelajaran Teknologi Mekanik di SMK. Metode yang digunakan adalah kuasi eksperimen dengan Pretest Posttest Control Group Design. Populasi penelitian adalah seluruh siswa kelas X Teknik Pemesinan SMK Negeri 1 Magelang yang berjumlah 126 siswa. Kelas X MC dan X MA dengan masing-masing 31 siswa dipilih menjadi sampel dengan metode sampling insidental. Kelas X MC dipilih sebagai kelompok kontrol dan kelas X MA dipilih sebagai kelompok perlakuan. Data dikumpulkan dengan observasi dan tes, kemudian dianalisis menggunakan uji tanda. Setelah diberikan tindakan diketahui bahwa siswa yang mencapai KKM (75) pada kelompok perlakuan sebanyak 30 siswa, sedangkan pada kelompok kontrol hanya 10 siswa. Rata-rata prestasi belajar kelompok perlakuan adalah 82,78 sedangkan kelompok kontrol 72,43. Peningkatan rata-rata prestasi belajar kelompok perlakuan mencapai 37% sedangkan kelompok kontrol 25%.

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