If you register, you can do a lot more. And become an active part of our growing community. You'll have access to hidden forums, and enjoy the ability of replying and starting conversations.

outside admission

Discuție în 'Locomotive M.I.C.' creată de expansionlink, 7 Iun 2014.

  1. expansionlink

    expansionlink New Member

    Înscris:
    20 Iul 2011
    Mesaje:
    2
    Aprecieri primite:
    0
    Ocupație:
    Retired
    Locație:
    Margate. Kent. UK
    I have read, "With outside-admission valves the eccentric or return crank is set at 90 degrees in front of the crank." Can someone please explain to me where this 90 degree angle is, as I just cannot visualise it. Thanks Ian Technophobe!
     
    expansionlink, 7 Iun 2014
    #1
  2. John Webb

    John Webb Member

    Înscris:
    2 Mar 2010
    Mesaje:
    501
    Aprecieri primite:
    86
    Ocupație:
    Retired
    Locație:
    St Albans, Herts
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    It's the angle between the crankpin and the end of the return crank relative to the centre of the axle when the loco is moving forwards. There are several books, including "Handbook for Railway Steam Locomotive Enginemen" (BTC 1957, reprinted by Ian Allan 1977 onwards) with various diagrams which make this clear.
     
    John Webb, 7 Iun 2014
    #2
  3. Eightpot

    Eightpot Resident of Nat Pres Friend

    Înscris:
    10 Aug 2006
    Mesaje:
    8.340
    Aprecieri primite:
    2.506
    Sex:
    Masculin
    Ocupație:
    Engineer Emeritus
    Locație:
    Aylesbury
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Probably better to say that the return crank leads the main crankpin by around 90 degrees. The actual amount is dependant upon the individual layout of the valve gear.
     
    Eightpot, 21 Noi 2014
    #3
  4. huochemi

    huochemi Part of the furniture

    Înscris:
    6 Mai 2008
    Mesaje:
    2.995
    Aprecieri primite:
    1.515
    Sex:
    Masculin
    Locație:
    UK
    Heritage Railway Volunteer:
    No I do not currently volunteer
    huochemi, 22 Noi 2014
    #4
  5. Steve

    Steve Resident of Nat Pres Friend

    Înscris:
    7 Oct 2006
    Mesaje:
    12.729
    Aprecieri primite:
    11.847
    Ocupație:
    Gentleman of leisure, nowadays
    Locație:
    Near Leeds
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    does this help with understanding it?
     

    Fișiere atașate:

    Steve, 22 Noi 2014
    #5

Distribuie pagina asta