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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. Bikermike

    Bikermike Well-Known Member

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    Looking good!
    Once the hind beam is on, is that the frames completed?
    Obviously a heck of a lot more to do, but it will be a good milestone.

    Presumably CTL Seal don't have any railway in their works - does that change how soon you aim to put it on wheels?
     
  2. ianh1

    ianh1 Member

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    Hi Bikermike

    Yes, that will be the frames complete

    The current work plan is

    1. Drill and ream the critical bolt holes that fasten the main frames/frame extensions/Firebox support stretcher and trailing feet (for frame keeps). It's all of the bolt holes in this photo around the reamer - 38 in total per side



    DSC_0007.jpg

    2. Measure all of the holes - some done yesterday

    3. Machine the bolts down to the size required for a heavy drive fit

    4. Install all bolts - torque to final setting

    5. Check dragbox is fitting with no gaps between frame extensions and dragbox.

    6. Hold meeting with our riveting contractor and CTL Seal to work out the best sequence of events to assemble the buffer beam and hind beam

    7. Drill and ream hind beam components

    8. Plug Weld Manganese steel liners to rubbing plates.

    9. Bolting/Riveting of buffer beam and hind beam. Order depends on 6 above

    10. Install brake hanger brackets

    11. Finalise fit of bogie pivot stretcher

    12. Inspection/check torque settings for all fasteners

    13. Paint with primer

    The motion brackets and slidebars can only go on as a temporary fit as they will need the cylinders to be in place before they can be final fitted

    We should be starting a trial assembly of the bogie frame next week

    "Presumably CTL Seal don't have any railway in their works - does that change how soon you aim to put it on wheels?" CTL Seal know that once we have anything with wheels, they need to go on rails and are working towards a solution

    Ian
     
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  3. Bikermike

    Bikermike Well-Known Member

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    Excellent stuff!
    Sheffield is the new Crewe!
     
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  4. ianh1

    ianh1 Member

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    The bogie spring cradle plates are being manufactured by Tyler Bros in Kirkby in Ashfield and are well into production. From the drawing you can see that it is not a flat plate

    Bogie Spring Cradle - 19518.jpg

    BR would have made these by stamping over formers. After a lot of thought and debate, it was decided to machine them from solid. Machining in one go would have set up a lot of stress and it would be unlikely if we had ended up with a flat plate. So the plates were manufacture din 2 operations. First machining to rough dimensions followed by a course of heat treatment to remove any stress. Then final machining to profile. The photo shows the plates nearing completion.

    Bogie Spring Cradle Plates.jpg

    Once machining is complete, we will need to fit the end distance pieces and the intermediate spring brackets that the ends of the inverted leaf spring will sit. The end distance pieces will hold a pivot pin that sits in a cup on top of the axleboxes. The central buckle of the leaf spring engages in a spring cup that needs to be welded onto the bottom of the "arms" of the bogie stretcher.
     
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  5. northernsteam

    northernsteam Member

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    Quite impressive when you see them in the raw metal. A comparatively small part of the whole thing but has thrown up its own challenges which are being overcome. Well done lads, look forward to seeing all the progress you have achieved over 2 years at the meeting/Open day on Saturday. Must remember to bring some plastic/folding stuff with me to leave with you. Every little helps, folks.
     
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  6. Bikermike

    Bikermike Well-Known Member

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  7. W.Williams

    W.Williams Well-Known Member

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    Makes sense to me. There are, I image, no existing dies for this, and by the time you machined some up, you'd have finished machining the component from solid.
     
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  8. LMS2968

    LMS2968 Part of the furniture

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    I'll grant that I'm not a metallurgist, but I would question the disruption of the grain by this method. If a flat plate is pressed to the contour, the grain bends with it and is continuous from end to end. Machining a thick plate down to size and contour means that the grain is discontinuous end to end, or am I missing something?
     
  9. osprey

    osprey Resident of Nat Pres

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    I would think consideration about the component and it's granular construction with regards to its application would be paramount
     
  10. class8mikado

    class8mikado Part of the furniture

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    I Would think that sort of consideration including modelling and FEA would have been done before the components got off their virtual drawing board... pernickety bunch.
     
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  11. northernsteam

    northernsteam Member

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    I seem to remember in my mechanical design days that it was common for parts to be machined in stages and then heat treated to varying degrees in order that the granular structure could re-orientate to form a laminar cohesion. My memory may be a bit obscure, it was some time ago!
    It was a bit like repeated striking of a metal bar laid in a certain direction would re-align the magnetic molecules, again, my memory may be obscure now. Modern engineering may have thrown those practices out the window!
     
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  12. W.Williams

    W.Williams Well-Known Member

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    Is this not where heat treatment is stepping in, to ensure homogeneous properties as far as possible?
     
  13. northernsteam

    northernsteam Member

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    Have just arrived home after this AGM and Open Day. I missed the AGM by being 10 minutes late, but did not miss the various presentations which followed.
    I hope that those members who were not able to attend will get a chance to see them because our Council of Management have grasped the nettle and set new goals for the project, just as we did 10 years ago when the project was saved.
    Very exciting and demanding, and every member needs to play a part to achieve our goal to see 'Hengist' steaming out of Sheffield in the next 10 years.
    I say no more, the C o M will provide the story as they are able no doubt.
     
  14. ianh1

    ianh1 Member

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    Yes, the machining of the spring cradle plates was a 2 step machining process from a solid block of steel. The original system of pressing was discounted as the cost of producing the formers would have been excessive for 4 plates. The first stage of machining was to produce the shape (white lines) to a broad outline with excess material for stage 2 machining. Stage 1 Machining.JPG
    The plates then went into heat treatment to sort out any stresses. After that the plates went into stage 2 machining to produce the final outline. All of this was discussed with our metallurgist at the design stage
     
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  15. northernsteam

    northernsteam Member

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    ..Thought you would have sussed it all out before you did anything!!
    These folk are careful, methodical and record everything they do on computer database.
    Sometimes it let's them down but most times it is not their error.
     
  16. 30854

    30854 Resident of Nat Pres

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    Stone the crows ..... they'd have got no further than clapping eyes on that trapezoidal spring section before throwing in the towel! ;)
     
  17. ianh1

    ianh1 Member

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    "trapezoidal spring section" - trapezoidal section steel bar before you start coiling it to form the spring. Then it becomes rectangular section. The bogie side control springs can be fitted at any time so we're in no hurry to find a solution.

    Tyler Bros have finished the bogie spring cradle plates and delivery to CTL Seal is being arranged. Looks like a good job

    IMG-20211019-WA0001.jpg

    Theres a video here



    Ian
     
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  18. northernsteam

    northernsteam Member

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    That looks a superb job, hope it passes inspection!!!!
     
  19. garth manor

    garth manor Well-Known Member

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    Great to see.
     
  20. W.Williams

    W.Williams Well-Known Member

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    These look cracking!
     

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