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3 1/2" Jubilee

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Mike Gibbons03/12/2010 22:06:52
8 forum posts

I am just starting to build my first Loco', Martin Evans' 3 1/2" Jubilee, and I am having a few problems; because, although the detail drawings are excellent, there is no "General Assembly" drawing, so I am having some difficulty finding out where some of the parts go. At this stage the three 1/2" dia. frame stretchers.  But my main question is about the wheels. In his book Martin Evans gives precise details and dimensions for the coning of the tyre, the taper of the flanges and the various radi; but in his drawings of Jubilee there is no coning and the flanges are parallel. What is the normal practice for this scale ----- to cone or not to cone?
John Baguley04/12/2010 14:35:58
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517 forum posts
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Hi MIke,
 
there's some photos of a nearly complete chassis on the Station Road Steam website that might help you:
 
http://www.stationroadsteam.co.uk/stock%20pages/4344/pages/4344-e.htm
 
I can only see two stretchers on that though, one between the outside motion brackets and one at the top of the chassis over the front rear bogie wheel.
 
Can't give you an answer on coning - I always do it but whether it is really necessary on our tracks is open to debate! A lot of tracks are plain flat steel bar with a flat top so you could say that leaving the treads flat might give better adhesion, leaving the radius at the flange to do the centreing of the wheelset, rather than the coning.
 
You've chosen a good design there. One at our track, even though getting a bit ancient, still does sterling service at passenger hauling
 
John

Edited By John Baguley on 04/12/2010 14:37:59

Mike Gibbons04/12/2010 17:25:15
8 forum posts

  John,
 
            Thanks for the reply; I'll have a good look at that web site.
 
           As for the coning, I'll ponder on that a bit yet.
 
  Mike.

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