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Brighton Atlantic: 32424 Beachy Head

Discussion in 'Steam Traction' started by Maunsell man, Oct 20, 2009.

  1. Spamcan81

    Spamcan81 Nat Pres stalwart

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    How do you convert the frames of a 4-6-0 into a set for a 4-4-2?
     
  2. paulhitch

    paulhitch Guest

    Well Churchward did something like this for the GWR early on in his career but they were designed to be so convertible. The present instance seems most improbable!

    Paul H.
     
  3. Jimc

    Jimc Part of the furniture

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    "A combined sub-frame and strengthening plate carrying the rear 4ft 1 1/2in wheels and axle with outside bearings was fitted to the locomotive frames in place of the trailing coupled axle, but the main frames of the [GWR] 'Atlantics' retained cut-outs to accommodate a trailing coupled wheelset in case conversion should ever be required"

    http://www.thesaintproject.co.uk/Pages/AtlanticOption.html
     
  4. Jamessquared

    Jamessquared Nat Pres stalwart

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    Yes, though those locos were designed as such, sharing driving wheels etc. Rather more difficult to use the same frames when there is twelve inches difference in wheel diameter between an H2 and an S15!

    Tom
     
  5. Spamcan81

    Spamcan81 Nat Pres stalwart

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    Forgot about those but as you say they were designed to be convertible.
     
  6. osprey

    osprey Member

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    I served my engineering apprenticeship in the machine tool industry and this method was and still is used as a method of lubricating slides. I spent many hours bedding surfaces together and can still do it....if you don't get the highs and lows right you will get the surfaces "wringing" together like slip gauges.......
     
  7. Lplus

    Lplus Member

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    Presumably that was for similar metals, eg steel on steel, not whitemetal on steel?
     
  8. dan.lank

    dan.lank Member

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    Very interesting chaps... Seems like using the S15 for an Atlantic starter kit might have been a step too far!


    Sent from my iPhone using Tapatalk
     
  9. osprey

    osprey Member

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    Mostly cast iron to cast iron/steel. I have however scraped ali-bronze, phosphor-bronze and white metal to steel. And nowadays a material called Shamban, a low friction product. I have scraped steel to align linear bearings. I have never scraped steel to steel and would have thought steel to steel bearings would be of a rolling element type.
     
  10. jnc

    jnc Part of the furniture

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    Sorry, I didn't follow that. Any chance you could explain in a bit more detail for us less-educated types? :)

    Noel
     
  11. ilvaporista

    ilvaporista Part of the furniture

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    'Wringing' is the process by which two very highly finished surfaces seem to stick together. You can take two optically flat surfaces and 'wring' them together by which the bond is so strong that it is almost impossible to pull apart, the only way is to slide them out of contact. Often used in precision metrology with measuring 'slip' blocks which are used to build up a master of an accurately known dimension.
     
    MarkinDurham and ragl like this.
  12. dhic001

    dhic001 New Member

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    If my memory serves me correctly, the S15 was going to donate its bogie and some other frame parts to the Atlantic, the S15 being considered really a spare parts loco at the time. Fortunately that didn't occur, giving us the slim hope that 830 might be seen in steam again. S15 tender and bogie wheels are the right size for the Atlantic, see http://www.bluebell-railway.co.uk/bluebell/locos/atlantic/latest_10.html
    Daniel
     
  13. osprey

    osprey Member

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    Could'nt have put it better....
     
  14. dan.lank

    dan.lank Member

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    Aha! That explains a lot...


    Sent from my iPhone using Tapatalk
     
  15. 61624

    61624 Well-Known Member

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    I think there may have been thoughts of using the driving axleboxes as well.
     
  16. jnc

    jnc Part of the furniture

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    Thanks for the explanation. Does this happen with dry surfaces too? (I think I've seen it myself, with wet surfaces.)

    Noel
     
  17. marshall5

    marshall5 Well-Known Member

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    Yes if they are made of the same metal (except cast iron which contains graphite and acts as a lubricant) and the surfaces will 'pick up'. That's why we use, for instance, bronze or white-metalled crosshead slippers on steel slide bars. Ray.
     
  18. David-Haggar

    David-Haggar New Member

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    Just flicking through Youtube this afternoon and found this old colour archive footage of a Brighton Atlantic. Sadly not Beachy Head but Trevose Head and gives a tantalising vision of what we will see on the Bluebell in the not too distant future.

     
  19. David-Haggar

    David-Haggar New Member

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  20. steam_mad

    steam_mad Member

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    Not wishing to be a pain, but what livery is planned for her once finished? (I know, lest important part of the build but interested!).
     

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