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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 New Member

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    No, all of these bolts are right hand (normal) threads. The original design of the main piston head and piston rod used a combination of a right hand thread nut and a left hand thread nut (LH with a smaller diameter) to lock the nuts onto the piston. This had problems as reported in Bill Harvey's book "60 Years in Steam" in which he says "Three cases of Piston Head L.H.' check nuts breaking off have occurred. (Later engines have LNE type head forged solid with rod)." The CLIP report recommends the latter design

    In addition to this locking arrangement, there are a few places where LH threads are used, for example on the Brake adjusting Pull Rods & Nuts
     
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  2. northernsteam

    northernsteam New Member

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    Yep, that's it! except in my day there were no programmers so that was the design from the engineer.
    O happy days:D
    Thanks to ianh for pointing out my error, I did know that, just forgot. This really can be a minefield of alternatives and ideas. Most of which have been used over the last several decades in 1 form or another, who said something about inventing a wheel? (never catch on :Resistanceisfutile:).
     
  3. std tank

    std tank Member

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    The fitting of LNER type piston heads/rods was an experiment carried out on Brits 70035-70044 . The units were fitted during 1952/3 and removed in 1957, with conventional heads and rods being refitted, as well as new front cylinder covers. 71000 was also fitted with the same design of piston heads/rods and forgotten about. Only now is it being fitted with conventional pistons, piston rods and front cylinder covers.
     
  4. class8mikado

    class8mikado Member

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  5. Hermod

    Hermod New Member

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    What was wrong with the LNER forged head scheme and do You have a picture or drawing?
     
  6. std tank

    std tank Member

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    Don't know why they were thrown out. The Duke people reckon there was excessive wear on the cylinder bores. Yes, there are drawings. By the way, the drawing for the piston and rod used in the experiment on the ten Brits shows a machined cast piston head butt welded on to a , presumably, forged and machined piston rod. Obviously, the entire piston and rod would be finish machined after welding.
     
  7. Steve

    Steve Part of the furniture Friend

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    They are an expensive option when you need to renew them, which is often necessary when you machine the cylinder bores.
     
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  8. ilvaporista

    ilvaporista Well-Known Member

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    Recently on a build thread of a 5" Flying Scotsman on the MECH forum there was a discussion and drawing of the integral forged head and piston rod, including the hollow rod. I have tried to find it but got bogged down reading so many other posts that I feel asleep. Maybe Julian jma1009 has a better memory and searching solution than me.
     
    Last edited: Oct 24, 2019
  9. class8mikado

    class8mikado Member

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    Which seems to happen a little too frequently with Standards.
    We await with interest how steps to improve matters on DoG progress. the thing with changing lots of small things to solve a problem is pinning the tail on the right one if the problem is solved,,,, ( Lubrication, slide bar anchoring, piston design...)
     
  10. ianh1

    ianh1 New Member

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    We had a good day out on the East Lancs Railway. Anthony Pilkington is the assembly shop supervisor at CTL Seal and he is responsible for the daya to day building of Hengist. We were very keen to get a footplate experience for Anthony so John Hind kindly set up a trip for Anthony. So yesterday morning we had a trip from Bury to Rawtenstall. On the return, Anthony travelled on the footplate from Rawtenstall to Ramsbottom; Keith Greenhow (our CAD modelling expert) travelled from Ramsbottom to Bury. Both wonderered why the loco didn't have any springs!

    In the afternoon we went round Bury works and had a very useful conversation with Dave Reynolds of the ELR. Dave was in the process of aligning a LMS Crab 2-6-0 and was able to pass on a lot of useful information about alignment of frames. Many thanks to John and Dave
     
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  11. ilvaporista

    ilvaporista Well-Known Member

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    Not sure if this works.
    http://redirect.viglink.com/?format...3_954eb64900_c.jpg" style="max-width: 100%;">
     
  12. Hermod

    Hermod New Member

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    Thank You for picture/drawing
    The thing was forged,stress relieved,machined,sent to foundry and got a bronce crown cast on as ring carrier and then machined to final size.
    No wonder that BR did not like this former LNER way.
    On the other hand mr Cox measured his own ability on superheat temperature.
    Mr Chapelon claimed that a sligth reduction in superheat temperature could be counteracted by a sligthly better boiler evaporation and cylinders would last longer with lower superheat.
     

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