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Majalah Forum Teknik UGM
Published by Universitas Gadjah Mada
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Engineering
Arjuna Subject : -
Articles 3 Documents
 1 
Search results for , issue "Vol 29, No 1 (2005)" : 3 Documents clear
Koefisien Perpindahan Massa pada Ekstraksi Aspal Buton dari Kabungka dan Bau-Bau dengan Pelarut n-Heksan Suryo Purwono; Bardi Murachman; Dyah Tri Yulianti; dan Suwati
Forum Teknik Vol 29, No 1 (2005)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Butonion  natural  asphalt  can be used for binder in road construction after its impurities were  removed  by  extraction  using  suitable  solvent.  Researches  on  extraction of Butonion asphalt  have been  done. However, most of them  are  explorative  research.This  experiment  tried  to find mass  transfer  coeficient for Butonion  asphalt  extraction.  The mass tronsfer  coefficient  will be  used  in  extraction  tower  design. In  this  experiment,  multi-stage  cross-cwrent  extraction  was  used  using  n-hexane  as  a solvent.  The number  of  stages was  seven.  Bitumen  obtained  was then  distilled to  separate  the  n-hexane. The operation  variables  were  :  size  of  solid,  rotation  and extTaction  time.The  relationship  of the  mass transfer  coefficient with other variables  can  be written  as:The  constant  values  of  Kabungka  asphalt  are  :  K=6.43558x10tt,  a=0.141569, b=0.2825804,  c =1.76857,  d=  -  1.381755,  e=t.636537x102 ;  those  of Bau-Bau  asphalt  are  : K=  6.3x  I0tt'a  = 0.0891,  b=  0.28258,  c=  L7699,  d = -1.3821Keywords  :  extraction,  mass transfer,  Butonion asphalt
Evaluasi terhadap Waktu Tunggu dan Jarak Berjalan Penumpang pada Perpindahan Moda di Stasiun Lempuyangan Yogyakarta Yuwono Wiarco; Siti Malkhamah
Forum Teknik Vol 29, No 1 (2005)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Lempuyangan Railway  Station is  located  in  Jogjakarta.  To  get  to  or  to  leave  the  station passengers  using  the  railway  services  take  other modes, such  as becak,  buses, taxis, and motorcycles (ojek). The  process of  mode  changing  is  very  importanl.  To  do so,  passengers  have to  walk  to  the  next  mode  stop  and  sometimes they  have to  wait for the  vehicle  arrival.  Research was undertaken  to investigate  the  performance  of  the  mode  changing  process,  in terms  of waiting  time and walking  distance,  based  on  site measurement  and  on what passengers perceived,  to  model the  relationship  between  the  performance  expected  and what  perceived  by the  passengers,  and to  evaluate  the  performance  using  standards set  by Directorate General of Land  Transport.  It  was found that  based  on both direct measurement  and  passengers perception,  the  performance  of  the changing  process  was  good.  There was a very good relationship between  what expected  and  what  perceived  by passengers.  The  waiting  time  and walking  distance  met  the  standards  required.Kata  kunci:  perpindahan  moda,  waktu  tunggu,  jarak  berjalan  kaki.
Pengembangan CNC Retrofit Milling untuk Meningkatkan Kemampuan Mesin Milling Manual Dalam Pemesinan Bentuk-bentuk Kompleks Muhammad Kusumawan Herliansyah
Forum Teknik Vol 29, No 1 (2005)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

In small-size mould manufacturing industry, milling process is an important element because this process consumes the longest produclion time. AIso, milling process needs great investments in tools. Most of the small-size mould manufacturing industries uses manual-milling machine for roughing process. Manual milling machine is used because of capacity limitation of the CNC milling machine and high investment of CNC machines.A prototype of low-cost CNC retrofit milling system is developed in this research, to enhance manual milling machine capabilities, in accuracy, speed, and process complexity. The advantage of the prototype results in reduced manufacturing cost and reduced lead time. This research also compare the capabilities of the prototype to others milling systems.The prototype results in accuracy of X axis and Y axis respectively 0.013 mm and 0.009 mm. This system is capable to set the feed rate of minimum 1 mm/min and maximum 250 mm/min, depending on the material being processed.Keywords: prototype, retrofit, CNC milling

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