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BR Standard class 6 No. 72010 'Hengist' and Clan Discussion Thread

Discussion in 'Steam Traction' started by Bulleid Pacific, Nov 23, 2009.

  1. class8mikado

    class8mikado Part of the furniture

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    In extremis there is always Germany, US or South Africa.
     
  2. huochemi

    huochemi Part of the furniture

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    Perhaps you can try these people? ;)
     
  3. ianh1

    ianh1 Member

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    We have tried a number of suppliers in the States without success. One British spring manufactured has proposed a 2 spring solution with an inner and outer spring. Initial calculations from the supplier look good and we are going to do our own load check calculations for confirmation
     
  4. Steve

    Steve Resident of Nat Pres Friend

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    If you want to end up with a square section spring you start off with a trapezoidal section rod. I don't think there is any difficulty in winding the spring, I believe it is the difficulty of getting hold of the section that is the problem, nowadays. It has been suggested to me that you could machine the section required out of square bar but that would be a costly operation. I presume that you have tried the Tested Spring Co. with no success?
     
  5. ianh1

    ianh1 Member

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    Steve. Thanks, thats interesting to know. You're probably right about getting hold of the right section material. Yes, we did approach the Tested Spring Co and they have provided the 2 spring alternative solution. We think this is probably the best solution and have worked up a design. I aim to put up a picture on the web site later on
     
  6. class8mikado

    class8mikado Part of the furniture

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    Do you have a link to the Upgraded web page Mr IanH. ?
     
  7. 'Clan' Hengist

    'Clan' Hengist New Member

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    Just use the usual link https://www.theclanproject.org/ It works every time for me...
     
  8. ianh1

    ianh1 Member

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    Thats the one. Ian
     
  9. 30854

    30854 Resident of Nat Pres

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    Will any eventual solution will be of potential interest to the owners of all BR 'Standards'?
     
  10. ianh1

    ianh1 Member

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    Yes, I would have thought so. if you go to the web site and follow Construction >> Build >>Front Bogie, you can see a drawing of the proposal.
     
    30854 likes this.
  11. huochemi

    huochemi Part of the furniture

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    Thanks Ian. What loco is the bogie shown at the Mid Hants from? It appears to have independent (suspension) springs.

    (may be of interest to others) There are some images of 70000's bogie showing the side control springs at http://fraserker.com/winson/britannia_pix/very_old_page_01.htm
     
  12. ianh1

    ianh1 Member

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    I don't know. I've been trying to find a good bogie photograph. Someone gave this to me and I wanted illustrate how the centre slide moves - it seemed to do the job
     
  13. huochemi

    huochemi Part of the furniture

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    I think it may be a Maunsell bogie. Other thoughts on the side control spring issue:

    1. Have you tried https://www.roehrs-springs.com/springs-products/compression-springs/flat-wire-compression-springs ?
    2. Perhaps consider machining from solid 6.25 inch diameter bar (drill a hole, fit a former (core) and then screw cut (or thread mill) through to the former) before hardening and tempering.
    3. Use a stack of Belleville washers.
     
  14. std tank

    std tank Part of the furniture

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    That is a very good and interesting find. Thanks for the info.
     
  15. ianh1

    ianh1 Member

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    Thanks, I've passed it on to our engineering group. Ian
     
  16. class8mikado

    class8mikado Part of the furniture

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    There is a good chance of a photo in ' Britannia, birth of a locomotive '. Will bring it along to the Open day if there is one.
     
  17. std tank

    std tank Part of the furniture

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    I have made an enquiry with Roehrs regarding the production of LMS/BR rectangular section pony truck side control springs. They got back to me fairly quickly. Their answer "We are not capable of producing a spring from such a massive wire profile".
     
  18. huochemi

    huochemi Part of the furniture

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    That's a pity. I found them by Googling images for "flat section helical spring".
     
  19. ianh1

    ianh1 Member

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    Yes, that was the reply we got. They responded very quickly.

    There isn't a good picture of the front bogie in the "Britannia" book. There is one of the trailing truck (or pony truck as Geoff likes to call it)
     
  20. ianh1

    ianh1 Member

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    huochemi - thanks for the post

    Item 1 has resulted in a "no can do" response from the supplier. They were very quick in responding
    Items 2 and 3 were run past our certification contact and were rejected.
     

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