If you register, you can do a lot more. And become an active part of our growing community. You'll have access to hidden forums, and enjoy the ability of replying and starting conversations.

82045 The way ahead?

Discussion in 'Steam Traction' started by Kinghambranch, May 24, 2008.

  1. gios

    gios Member

    Joined:
    Apr 20, 2012
    Messages:
    273
    Likes Received:
    781
    June Update: http://www.82045.org.uk/news/82045_news-jun22.html
     
  2. gios

    gios Member

    Joined:
    Apr 20, 2012
    Messages:
    273
    Likes Received:
    781
  3. gios

    gios Member

    Joined:
    Apr 20, 2012
    Messages:
    273
    Likes Received:
    781
  4. Robin

    Robin Well-Known Member Friend

    Joined:
    May 7, 2012
    Messages:
    1,283
    Likes Received:
    1,549
    Location:
    Stourbridge
    The July update included the following:

    "The lifting arms on the ends of the reversing shaft have been fitted. These are an interference fit with a key incorporated and the process involved lowering the ends of the shaft into a drum of liquid nitrogen to lower the temperature whilst the boss of the arms were heated to increase the size of the bore. The frozen ends of the shaft were then quickly lowered into the hot bore of the boss of the arms and the temperatures allowed time to normalise. Some calculations had been done in the days beforehand and in heating the boss of the arms the temperature was checked with a heat gun and the bore with pre-set calipers until it was declared satisfactory to lower the frozen end of the shaft into the arm. The operation was filmed and will no doubt appear in due course."

    The video is now on YouTube.

     
    ragl, 30854, ghost and 7 others like this.
  5. Jamessquared

    Jamessquared Nat Pres stalwart

    Joined:
    Mar 8, 2008
    Messages:
    23,911
    Likes Received:
    48,441
    Location:
    LBSC 215
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Thanks for that, interesting to see. One wonders how they did that in the 19th century when liquid N2 wasn't the industrial commodity it is now; presumably heating just one side and a bloody big press? (rather than simultaneous heating and cooling and a nice sliding fit).

    (Fun fact: back in my lab days, a favourite demo for prospective students on open days was to blow up a rubber glove, freeze it in liquid nitrogen and then smash it with a hammer. Having shown the effect of the stuff on organic materials, you'd then take a bit in a cup and poor it into the palm of your hand, which was perfectly safe provided you knew what you were doing - basically keep it moving, and the evaporating gas prevented the cold liquid actually coming into contact with your skin, so you got a drop of liquid floating on a cushion of gas and no frostbite. Don't try this at home kids, we were trained professionals ...)

    Tom
     
    Kje7812, Diamond Gaz, gios and 5 others like this.
  6. gios

    gios Member

    Joined:
    Apr 20, 2012
    Messages:
    273
    Likes Received:
    781
    Brilliant video.

    You lads don't look a day older than when you first became involved with 82045 and still display to all your undoubted skills. Well done all.
     
    30854 likes this.
  7. MellishR

    MellishR Resident of Nat Pres Friend

    Joined:
    Apr 16, 2009
    Messages:
    7,107
    Likes Received:
    4,364
    What is the rationale for having a circular shaft fitting into a circular hole rather than for instance square? And, given the circular shape, why have both an interference fit and a key? I realise this is "how it's done" but there ought to be an easier way.
     
  8. ghost

    ghost Part of the furniture

    Joined:
    May 29, 2006
    Messages:
    3,433
    Likes Received:
    3,805
    Gender:
    Male
    Location:
    N.Ireland
    Easier/cheaper to machine a round shaft and bore a round hole than machine a square hole and square shaft.
    I would think the pin is simply a backup.
     
    std tank and keith6233 like this.
  9. ghost

    ghost Part of the furniture

    Joined:
    May 29, 2006
    Messages:
    3,433
    Likes Received:
    3,805
    Gender:
    Male
    Location:
    N.Ireland
    Duplicate post
     
  10. 30854

    30854 Resident of Nat Pres

    Joined:
    Mar 8, 2017
    Messages:
    12,142
    Likes Received:
    11,447
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Brighton&Hove
    Heritage Railway Volunteer:
    No I do not currently volunteer
    I've seen old clips of tyres being fitted to drivers at both Crewe and Swindon and even on old B&W film, the phrase which came to mind was "bloody terrifying"! Effectively, they created their own mini volcano as a trip hazard (and then some) on the shop floor, in which to heat things to about the same temperature differential achieved by the extremes of liquid nitrogen and the torch. Those guys must've been complete experts with chain and gantry systems, as express loco drivers were deftly and rapidly moved to precisely where they were needed.

    There was a big deal made at Crewe in the 1930s of electrical heating elements being introduced .... a lot of very big ones (would that have been a Stanier innovation?). I'd have to reckon that sweating like glassblower's ar*e had nothing on working under those conditions.

    Really enjoyed that clip. Now the 2nd time I've seen the cryo technique in use (the first was part of Welsh Pony's restoration, already a few years back now).
     
    Gareth likes this.
  11. W.Williams

    W.Williams Well-Known Member

    Joined:
    Dec 20, 2015
    Messages:
    1,563
    Likes Received:
    1,410
    Occupation:
    Mechanical Engineer
    Location:
    Aberdeenshire
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Also, this shaft has to run on some sort of bearing, so it needs to be round for that too.

    The key is there to ensure alignment, but also, as you saw, to ensure that the parts get fitted together in line.

    This is nice work, methodical, checking the temps, and great to see PPE too, no chances being taken with safety.

    The temperature delta method is so good because its virtually damage free. Pressing a shaft through its interference is always going to lead to scoring, and in the worst case, misalignment.

    Will this loco ever go on tour? I would love to see it operate in Strathspey.
     
    Last edited: Sep 12, 2022
  12. 30854

    30854 Resident of Nat Pres

    Joined:
    Mar 8, 2017
    Messages:
    12,142
    Likes Received:
    11,447
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Brighton&Hove
    Heritage Railway Volunteer:
    No I do not currently volunteer
    I'd imagine there will be a pretty long queue for visits.
     
    Hampshire Unit likes this.
  13. Paul Grant

    Paul Grant Member

    Joined:
    Oct 6, 2010
    Messages:
    794
    Likes Received:
    568
    Location:
    Fife
    Heritage Railway Volunteer:
    No I do not currently volunteer
    Similarly, it would be an ideal locomotive if the Keith & Dufftown ever went into steam seriously. Now the the 3MT in its 2-6-0 form...
     
  14. Ploughman

    Ploughman Part of the furniture

    Joined:
    Apr 1, 2008
    Messages:
    5,599
    Likes Received:
    2,504
    Occupation:
    Ex a lot of things.
    Location:
    Near where the 3 Ridings meet
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    When I worked at BREL York.
    One of the jobs I covered on relief was Retyring of wheelsets.
    In our case the Gas Burners were in a shallow broad pit and could be kicked around to suit different tyre diameters.
    Stepping onto the heated tyre was expected as part of the job and the only additional safety gear was issued for this.
    Toetector Clogs with mini horseshoes nailed onto the underside. Still got my pair not used since then and lethal for skidding.
     
    hyboy and Hampshire Unit like this.
  15. ady

    ady Well-Known Member

    Joined:
    Jul 4, 2006
    Messages:
    2,265
    Likes Received:
    227
    Gender:
    Male
    Occupation:
    Post office
    Location:
    South
    Heritage Railway Volunteer:
    No I do not currently volunteer
    I'm hoping it visits Swanage as they used to work there. Briefly...
     
  16. 61624

    61624 Part of the furniture

    Joined:
    Sep 27, 2006
    Messages:
    4,708
    Likes Received:
    2,858
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Ditto the NYMR!
     
  17. Cartman

    Cartman Well-Known Member

    Joined:
    Dec 14, 2015
    Messages:
    1,795
    Likes Received:
    1,319
    Gender:
    Male
    Location:
    Cheshire
    Heritage Railway Volunteer:
    No I do not currently volunteer
    East Lancs? Four did, briefly, end up at Patricroft, which isn't that far away!
     
  18. 30854

    30854 Resident of Nat Pres

    Joined:
    Mar 8, 2017
    Messages:
    12,142
    Likes Received:
    11,447
    Gender:
    Male
    Occupation:
    Retired
    Location:
    Brighton&Hove
    Heritage Railway Volunteer:
    No I do not currently volunteer
    Yes, I know it's not going mainline any time soon .... but I'd dearly love to see it on another of the class's former stamping grounds, the Cambrian Coast. A chap can dream!
     
  19. Kje7812

    Kje7812 Well-Known Member

    Joined:
    Nov 25, 2010
    Messages:
    2,397
    Likes Received:
    781
    Location:
    Kidderminster/ Cardiff
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    In some ways not wearing gloves is better than wearing unsuitable gloves when using liquid nitrogen, as it won't get trapped between the glove and skin. Of course, proper cryogenic gloves are best but they are often quite cumbersome to use.
     
    Richard Roper and Jamessquared like this.
  20. Richard Roper

    Richard Roper Well-Known Member

    Joined:
    May 22, 2006
    Messages:
    1,284
    Likes Received:
    1,308
    Gender:
    Male
    Occupation:
    Librarian
    Location:
    Just up the road from 56E Sowerby Bridge
    Heritage Railway Volunteer:
    No I do not currently volunteer
    As part of my job, I have to do a Liquid Nitrogen fill once a week - Pressure dewars and onion dewars. The cryogenic gloves we have are leather, but sometimes the frost from handling the connections can soak into the fingers of the gloves. Not very comfortable, but certainly not -196 degrees... Filling onion dewars is the worst part, as the evolved gas forms a dense cloud, which on calm days hangs around and is very slow to disperse. When an onion dewar is full, there's a nice fountain of Liquid Nitrogen until the manifold valve is screwed shut. Had many splashes on the top of my head, it boils off straight away and isn't a problem. We now have hard hats for this, and also Face visors, as well as Lab coats and ear defenders.

    Richard.
     

Share This Page