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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.

ANALYSIS OF ELECTRONIC MATERIAL USE OF BASIC MATERIALS, IN EMS STEEL EDM PROCESS 45 REVIEWED FROM THE ASPECTS OF ELECTRODES OF MASS REDUCTION AND SURFACE DAMAGE Tiwan Tiwan
Jurnal Penelitian Saintek Vol 12, No 1: April 2007
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The aim pf this research is to analyze characteristic of Cu-based material that has been used as electrode in EDM process. The research variables are wearness off electrode, weightloss and roughness of specimens of EMS 45 steel.Experimental methode was used in this research, which consists of preparation process and EDM test, EDM process, characterization and testingprocess. Analysis was done based on characterization and testing process. Testing process comprises electrode wearness, weightloss and roughness of the specimen.The result show that wearness of brass electrode is higher than bronze electrode. However, bronze electrode gives rapid weight loss. At current of 45 A and pulse on time 3 s, weight loss of EMS 45 steel was1,8 timefaster using bronze electrode, but wearness of brass electrode was 18,67 times faster. Surface roughness of EMS 45 steel was smoother using bronze electrode. Weight loss of EMS 45 steel and electrode wearness affected by current andpulse on time. Nevertheles, surface roughness of EMS 45 influenced by current, but not bypulse on time.

Penerapan Modul Pembelajaran Bahan Teknik sebagai Upaya Peningkatan Proses Pembelajaran di Jurusan Pendidikan Teknik Mesin FT UNY Tiwan Tiwan
Jurnal Pendidikan Teknologi dan Kejuruan Vol 19, No 2 (2010): (Oktober)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Penelitian ini mengkaji penerapan modul pada pembelajaran Bahan Teknik Dasar, sebagai media belajar dalam upaya peningkatan proses pembelajaran di Jurusan Pendidikan Teknik Mesin FT UNY. Penelitian dilakukan dengan pendekatan penelitian research and development (RD). Tempat penelitian di Jurusan Pendidikan Teknik Mesin Universitas Negeri Yogyakarta. Waktu penelitian dimulai dari bulan Mei-November 2009. Responden penelitian adalah dosen pengampu Bahan Teknik Dasar dan mahasiswa angkatan 2009. Pengumpulan data dengan instrumen angket dan tes hasil belajar.Hasil penelitian menunjukkan bahwa Penulisan Modul Bahan Teknik Dasar dikembangkan dari kurikulum dan silabi mata kuliah Bahan Teknik Dasar yang memiliki struktur terdiri dari halaman sampul, pengantar, judul pokok bahasan, standar kompetensi, kompetensi dasar, tujuan pembelajaran, kegiatan belajar, kunci jawaban dan daftar pustaka. Penulisan modul merupakan proses penyusunan materi pembelajaran yang dikemas secara sistematis sehingga siap dipelajari untuk mencapai kompetensi atau sub kompetensi. Tahapan penulisan modul bahan teknik dasar meliputi analisis kebutuhan modul, penyusunan draft, uji coba, validasi, revisi dan produksi. Modul yang dibuat dapat diterima oleh dosen pengampu dan mahasiswa dalam kategori baik. Terdapat perbedaan pencapaian prestasi belajar antara kelompok yang diberi modul dengan kelompok yang tidak diberi modul. Kelompok mahasiswa yang diberi modul memiliki pencapaian prestasi yang lebih baik.

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.

PENINGKATAN PRESTASI BELAJAR MAHASISWA PADA MATA KOMPUTER PEMROGRAMAN MELALUI PEMANFAATAN RECORDING MACRO Tiwan Tiwan
Jurnal Pendidikan Teknologi dan Kejuruan Vol 21, No 1 (2012): (Mei)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

ABSTRACTThe learning process of computer programming course requires the skills of programming flow arrangementand programming logic. The reading materials, exercises, and classroom discussion have not met the learninggoals of this course. Therefore, an additional media needs to be implemented to improve the learning process. Theprogram of macro recording in Microsoft Office can facilitate the students to have exercises and material analysisautonomously beyond the classroom activities.This study belongs to action research. The participants were the sixth semester students of Civil Engineeringand Planning, Faculty of Engineering, Yogyakarta State University, who joined computer programming course for4 months. This research employed two cycles, which was started by planning, implementation observation andfinally, reflection.The result of the research showed that there was an improvement of the learning achievement from 2.8 into3.29 for computer programming course by utilizing macro recording facility of Microsoft product.Keywords: Recording Macro, Learning Process

Tool from Pack Carburized Low Carbon Steel Arianto Leman Soemawidagdo; Tiwan Tiwan; Mujiyono Mujiyono
Jurnal Penelitian Saintek Vol 19, No 2: Oktober 2014
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The research is aimed at developing alternative tool from pack carburized low carbon steel. The tools were made from low carbon steel of 111,67 VHN using cutting machine and then sharpened. Carburizing process was conducted at temperature vary of 800, 850 and 900 0C for 1, 2 and 3 hours and then quenched into water and oil. The tools were subsequently quenched after diffusion process. The tools was used to cut mild steel of Ø31,75 mm on EMCO Maximat V-13 lathe machine with cutting speed 25m/minutes, feeding 0,112mm/ rpm and depth of cut 1 mm. Tools that carburized at 850 0C for 3 hours dan quenched in water gives mean maximum hardness of 760,4 VHN and tool life up to 425 second. It shows that the tool is not economical developed for mass production.

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

Pengaruh Praktik Industri Terhadap Hard Skill Siswa SMK pada Program Keahlian Teknik Pemesinan Yudha Dwi Prasetyo; Tiwan Tiwan; Arianto Leman Soemowidagdo
Jurnal Dinamika Vokasional Teknik Mesin Vol. 3 No. 2 (2018): Oktober
Publisher : Department of Mechanical Engineering Education

The implementation of industrial practices is expected to improve skills, verbal abilities, and can provide creative ideas for students in developing skills that have been raised to create the right innovation. This research aims to determine the implementation of industrial attachment for the students of machining study program, and the influence of industrial attachment on the students' hard skill. This research used ex-post facto method with a quantitative approach. The subjects were class XII students of machining study program with a total sample of 98 students. Data were collected using questionnaire and documentation. Data were analyzed using Pearson's product moment correlation and simple regression analysis. Results show that the implementation of industrial attachment for students of machining study program is categorized as "˜high' (69,38% in average), and that there is as a positive and significant effect on the students' hard skill.Pelaksanaan praktik industri diharapkan mampu meningkatan keterampilan, kemampuan verbal, dan dapat memberikan ide-ide kreatif bagi siswa dalam mengembangkan keterampilan yang telah dimilikinya untuk membuat inovasi produk tepat guna. Penelitian ini bertujuan untuk mengetahui keterlaksanaan praktik industri siswa Teknik Pemesinan, dan pengaruh praktik industri terhadap hard skill siswa. Penelitian ini menggunakan metode ex-post facto dengan pendekatan kuantitatif. Subyek penelitian adalah siswa kelas XII program keahlian Teknik Pemesinan dengan jumlah sampel 98 siswa. Metode pengumpulan data dengan metode kuesioner dan dokumentasi. Teknik analisis data menggunakan teknik korelasi product moment dari Pearson dan dilakukan uji analisis regresi sederhana. Hasil penelitian menunjukkan bahwa keterlaksanaan praktik industri siswa teknik pemesinan rata-rata temasuk kedalam kategori tinggi 69,38%, dan praktik industri berpengaruh positif dan signifikan terhadap hard skill siswa. Hubungan yang diperoleh adalah semakin tinggi tingkat pelaksanaan praktik industri, maka semakin tinggi pula hard skill-nya dan bidang pekerjaan memiliki pengaruh tinggi terhadap nilai praktik industri siswa teknik pemesinan

Methods in Making Steel-Copper Sandwich Laminates Materials Arianto Leman Soemowidagdo; Tiwan Tiwan
Jurnal Dinamika Vokasional Teknik Mesin Vol. 4 No. 2 (2019): Oktober
Publisher : Department of Mechanical Engineering Education

This research is aimed at developing a method to make steel-copper sandwich laminate materials. The research focused on the method of developing the sandwich material. In a method I, the steel plate arrangement is heated up to austenite temperature and subsequently, a molten copper is poured into it. In method II, the steel plate arrangement is immersed into a molten copper in a temperature of 1200 °C. The result shows that in the method I, the diffusion on the interface layer of steel-copper sandwich laminate is unemployed because of an occurrence of oxidation on the steel surface. On the contrary, in method II the diffusion on the interface of steel-copper sandwich laminate is indicated by higher shear stress, which is 231.88 N/mm2. However, the immersing method needs to be improved to give better products, since cavities caused by trapped air still exist and are reducing the quality of the laminates.Penelitian ini ditujukan untuk mengembangkan metode pembuatan laminat baja-tembaga. Penelitian difokuskan pada metode pembuatan laminat. Pada metode I, susunan pelat baja dipanaskan hingga suhu austenit dan kemudian tembaga cair dituangkan. Metode II adalah merendam susunan pelat baja ke dalam tembaga cair bersuhu 1200 0C. Hasil penelitian menunjukkan bahwa pada metode I tidak terjadi difusi pada lapisan antarmuka laminat baja-tembaga karena permukaan baja mengalami oksidasi saat dipanaskan. Sebaliknya, metode II menunjukkan terjadi difusi pada antarmuka laminat baja-tembaga dengan tegangan geser tertinggi 231,88 N/mm2. Namun, metode II harus diperbaiki untuk memberikan produk yang lebih baik karena masih terdapat rongga akibat udara yang terjebak dan mengurangi kualitas laminat.

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