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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. ianh1

    ianh1 Member

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    Yes. The trailing foot was manufactured before the CAD model. We have a full design for the trailing spring brackets and we have quotes. The only other missing part for frame assembly is a simple buffer beam angle support which got lost in all of the moves. This is straightforward to replace
     
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  2. ianh1

    ianh1 Member

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    We've got a bit of a lull at the moment as the 2 offending parts were returned to the subcontractor last week. We can't start frame alignment until those are fitted. The stretcher for the front firebox support and trailing truck pivot is fitted with a shield that (I guess) protects the pivot from ashes falling out of the ashpan. We noted that this had been made out of ordinary mild steel so we've had this replaced by a stainless version as we didn't think the former would last very long in a hostile environment. On the news page you will see that the bogie bolster cups are in stock. Our pattern makers are making good progress on the bogie stretcher pattern - we hope to have this for you to see at the September AGM.
     
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  3. ianh1

    ianh1 Member

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    A big milestone day yesterday as you will see on the web site news page - https://www.theclanproject.org/Clan_News.php. The frame alignment has been checked using a new laser tracking device. Essentially, the frames are in alignment but, like most projects, we have a couple of minor issues to sort out. The smokebox saddle isn't sitting quite correctly on the frames at the back right hand corner. John Hind from AST joined us for the day and he spotted one issue with a good old fashioned feeler gauge! In a couple of places the frames aren't sitting tightly on the cast steel stretchers. CTL Seal will be looking at these issues this week. The other bit of news is that all of the fitted bolts are now in stock which should allow bolting to start as soon as the frame issues are sorted.
     
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  4. class8mikado

    class8mikado Member

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    Might be able to do some painting soon...!
     
  5. ianh1

    ianh1 Member

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    Ashley has been painting the cab roof ventilators and a very nice job too. He's also given the smokebox a good coat of paint
     
  6. 30854

    30854 Part of the furniture

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    The Clan website nowadays really reflects a project that's developed serious momentum. Such a welcome turn around from those dark days before the current team took the reigns .... and as much as the photos, I'm loving the recent CAD renderings, which readily give an excellent idea of where things are 'at'.
     
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  7. ianh1

    ianh1 Member

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    Thanks for the feedback, it's much appreciated. At the AGM, we hope to have a PC and a large screen so that you can have a good look at the CAD models yourself. If you have any questions, let me know here
     
  8. class8mikado

    class8mikado Member

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    a few hundred more Ashleys and it would be finished in no time....!
     
  9. W.Williams

    W.Williams Well-Known Member

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    0B44958F-3EFB-4C10-A613-1B3C742B3F13.jpeg
    That’s the way to do it. Model coming along nicely.


    FA734599-C9E4-4AD3-82F4-3B03639ED77D.jpeg

    Look at those! They are more jewellery than bolt!

    The quality of the work being done here is clearly to a very high standard.
     
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  10. ianh1

    ianh1 Member

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    The bolts came from Generic Engineering in Rotherham. We had originally ordered the bolts from a different supplier but they let us down badly. We gave Generic an order for 653 Whitworth bolts in the first week of August and they produced these magnificent quality bolts in 5 weeks. As you say, the quality is first class.
     
  11. class8mikado

    class8mikado Member

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    Is it a resin dip ? to protect the threads...
     
  12. ianh1

    ianh1 Member

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    Mike Sedgley said it was a hot wax dip. Yes it protects the threads during transit handling and is pulled off before fitting
     
  13. northernsteam

    northernsteam New Member

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    Did you manage to get any recompense for their problem? The new ones look fantastic, seems a shame to have to turn them down to fit!
     
  14. ianh1

    ianh1 Member

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    CTL Seal are working on it. They do look too good to turn down, don't they? We are aiming to spend tomorrow sorting the bolts into bags or boxes to match Keith's 30 page bolting specification drawing
     
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  15. huochemi

    huochemi Well-Known Member Friend

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    When you say "turn down", do you mean they are not the right diameter
     
  16. ianh1

    ianh1 Member

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    They are non standard in that all of the shanks are .010"/.015" oversize as defined on our drawing. All of the bolt holes are currently 1/16" undersize. When installing the bolt

    1. The holes are drilled and reamed to the required size (3/4", 7/8", 1" and so on).
    2. A 0.1" by 45 degree chamfer is machined on the bolt head side of the hole to allow for the small radius under the bolt head
    3. The bolt is then turned to provide a drive (i.e. interference) fit
    4. The bolt is installed - probably with the assistance of a hammer
    5. A Philidas nut is installed (http://www.philidaslimited.co.uk/products/industrial-nut/)

    It's going to be a slow job as there are a lot of bolts to install
     
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  17. huochemi

    huochemi Well-Known Member Friend

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    Thanks, interesting, so presumably part of the thread is also turned down? It is going to require some care in chucking to get the bolts running true for turning. Is it usual to do it in two stages? It seems easier to make the bolt to the finished size in one operation.
     
  18. Sheff

    Sheff Well-Known Member

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    I assume it is just the shank that is turned down to fit and that the thread is already slightly below the minimum hole diameter?
     
  19. marshall5

    marshall5 Well-Known Member

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    Wouldn't it be easier to ream the hole to suit an already finish turned bolt?
    Ray.
     
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  20. northernsteam

    northernsteam New Member

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    Not wishing to pre-empt ianh1, the shanks are turned down to fit. The threads are already the required dia for a standard nut, ie 1.0" for shanks over 1.0" or 7/8" for shanks over 7/8" etc. No good having a thread bigger than the hole is it! Standard thread sizes are, in my experience, usually slightly below stated dia anyway, a few thou'. Busy doing a similar job on a Peckett industrial at SRM. To answer 'huochemi', the shank has to be very accurate and it can vary between holes, all depends on the reaming operation through several steel items. [ casting/frame/casting].
    I hope ianh1 agrees with this reply;)
     

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