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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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (8198.929 KB) | DOI: 10.21831/jps.v12i1.5460

Abstract

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.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (230.762 KB) | DOI: 10.21831/dinamika.v3i2.21404

Abstract

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
Karakterisasi Grinding Balls Produksi CV Baja Ellips Arianto Leman; Tiwan Tiwan; Nurdjito Nurdjito
Jurnal Dinamika Vokasional Teknik Mesin Vol. 3 No. 1 (2018): April
Publisher : Department of Mechanical Engineering Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/dinamika.v3i1.19115

Abstract

This research is aimed to study the characteristics of cast grinding balls produced by CV Baja Ellips Ceper, Klaten. The samples were taken from three tapping. One group was quenched in water while the other was not. The studied characteristics comprised of chemical composition, microstructure, hardness and wear. The result shows that the grinding balls have the chemical composition of medium-strength cast iron. However, the microstructure shows cementite and pearlite that indicates the structure of a white cast iron. The hardness of quenched and unquenched grinding balls are 60 HRC and 57 HRC, respectively. The hardness is consistent from the edges to the middle of the grinding balls. The specific wear of quenched grinding balls and unquenched grinding balls is 3.32963 x 10-06 mm2/kg and 5.032 x 10-06 mm2/kg, respectivelyPenelitian ini bertujuan untuk mengetahui karakteristik grinding balls produksi CV Baja Ellips Ceper Klaten yang dibuat dengan menggunakan proses pengecoran. Sampel grinding balls diambil dari tiga kali tapping yang berbeda. Satu kelompok dicelup dingin dalam air dan yang tidak dicelup dingin. Karakterisasi yang dilakukan meliputi komposisi kimia, struktur mikro, kekerasan dan keausan. Hasil penelitian menunjukkan bahwa komposisi kimia dari bola penggiling termasuk dalam kelas besi tuang kekuatan sedang. Struktur mikro yang tampak adalah sementit dan perlit yang menunjukkan struktur besi tuang putih. Kekerasan grinding balls yang dicelup dingin adalah 60 HRC sedangkan yang tanpa dicelup dingin sebesar 57 HRC. Kekerasan grinding balls konsisten dari bagian tepi sampai bagian tengah. Keausan spesifik grinding balls yang dicelup dingin dan tanpa dicelup dingin berturut-turut 3,32963 x 10-06 mm2/kg dan 5,032 x 10-06 mm2/kg
RANCANG BANGUN MESIN PENGADUK ADONAN BAHAN DODOL BATANG DAN BUAH PEPAYA UNTUK MENINGKATKAN KAPASITAS PRODUKSI INDUSTRI KECIL DI PEDESAAN tiwan, Tiwan
INOTEKS: Jurnal Inovasi Ilmu Pengetahuan,Teknologi, dan Seni Vol 14, No 1 (2010)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (69.899 KB) | DOI: 10.21831/ino.v14i1.2280

Abstract

This  community  service  activity  of  appropriate  technology  based leading program aims to support solving the problem faced by small home industries   KUB   "DHARMA   MAKMUR"   in   the   stirring   process   of homogenizing delicacy dough substance of papaya stem and fruit. This stirring process is the beginning activity of the production process of the papaya stem and fruit delicacy. To solve the problem faced by the working partner, this appropriate technology based community service program focuses on the stirring machine construction  followed  by  the  training  activity  using  the  methods  of:  (1) designing the machine compromised to the working partner needs, (2) lecture of machine working principles, (2) demonstration of the machine operation training, (3) field practice to equip the skills for the members of the home industry of KUB "DHARMA MAKMUR". The product of this community service activity is the realization of a mixing machine unit to stir delicacy dough of papaya stem and fruit having the specifications of: (1) dimension of length x width x height=60x50x80 cm, and (2) electric motor of 0,5 HP. The machine operation technique and safety are conducted by turning the machine on until the normal speed of the stirring plate rotation and adjusting the stirring plate rotation speed considering the delicacy dough being mixed. The productivity of the machine produced by this appropriate technology based community service leading program can be eight to ten times quicker compared to working with manual equipments.
MESIN PENGANYAM KAWAT STRIMIN UNTUK INDUSTRI KECIL Tiwan, Tiwan; Hantoro, Sirad
INOTEKS: Jurnal Inovasi Ilmu Pengetahuan,Teknologi, dan Seni Vol 1, No 1 (1999)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ino.v1i1.5091

Abstract

Program  Vucer  ini bertujuan   untuk  mernbantu   industri  kecil  dalam  hal pengembangan    teknologi   pembuatan   anyaman sawat  strimin,  Yang menjadi   sasaran  dalam  program  ini adalah  para  pengusaha   industri  kecil  yang  bergerak  dalarn  bidang:<".'mbuatankawat  strimin. Upaya yang dapat  dilakukan  untuk menyelesaikan   permasalahan   yang dihadapi  industri  kecil yang bergerak  dalam usaha:<".'nganyamankawat  strimin  adalah  membantu   dalam  hal peningkatan   teknologinya.   Adapun  langkah-langkah    yang  dapat...  kukan  adalah:  pengkajian   mesin  penganyam   kawat,  perencanaan   mesin  penganyam   kawat  strimin,  pembuatan   gambar--: a,  penetapan   jadwal   kerja,   pelaksanaan    pembuatan    mesin.   assembling   mesin,   uji  cob a mesin,   evaluasi   hasil,  dan-    ~-empumaan. Adapun  spesifikasi   mesin  penganyam   kawat  strimin  yang  dibuat  adalah  sebagai  berikut:  panjang   J  000  mm,  lebar  400-    tinggi  J 050 mm, tinggi meja  800 mm. Penggerak  motor  listrik  1 phase.  P=]  PK, n = 1450 rpm. Transmisi:  Puley & belt,-_'::.Jcer,  roda  gigi,  kopling.  Dais  pembentuk   Pitch  60 dan Pitch  40.  Putaran  kerja  50 rpm,  panjang  Meja  anyam  2000 mm,- ~~. meja anyam 890 mm. Berdasarkan   dari hasil kegiatan  ini maka dapat disimpulkan  bahwa  kegiatan  ini sangat bermanfaat am usaha  pengembangan    industri  kecil.  Dari  hasil  uji coba  mesin  penganyam  kawat  yang  dibuat  sudah  dapat  beroperasi~   "-3..i  dengan  permintaan   industri  kecil,  danjika   dilihat  dari hasil kerjanya.  mesin ini lebih cepat  dan hasilnya  lebih baik.