Gwr Track Chairs
- Thread starter 28ten
- Start date
Dog Star
Western Thunderer
Try these pages:-
http://basilicafields.wordpress.com...-for-gun-street-depot-circa-1880-1905-part-2/
http://basilicafields.wordpress.com...eat-western-permanent-way-in-victorian-times/
http://basilicafields.wordpress.com/2011/05/09/quirky-answers-gwr-pw-chairs/
I have another drawing somewhere... probably the chair for the 00 section rail.
Graham
28ten
Guv'nor
I knew I had seen them somewhere
the first link looks about right, are they your own drawings?
Dog Star
Western Thunderer
I knew I had seen them somewhere
The drawings are contained in the proceedings for a GWR Junior Engineering Society meeting which took place before 1900. I have a .pdf of the document.
How else can I help with your challenge?
regards, Graham
28ten
Guv'nor
This is working sketch, what looks like a simple object is actually quite complicated to model so at this point I am trying out various drawing planes, making extrusions and then removing parts. once I have worked out the methodology it will get more accurate.
Projecting image onto the workplane
at this stage I want to see how a 3d print turns out and the viability of making track. All being well it opens the possibility of accurate chairs for the crossings.
Projecting image onto the workplane
Once there is something I am near happy with Ill send you a drawing
at this stage I want to see how a 3d print turns out and the viability of making track. All being well it opens the possibility of accurate chairs for the crossings.
Dog Star
Western Thunderer
Once there is something I am near happy with Ill send you a drawing
Ah, now switch and crossings were not covered in the Engineering Society paper. On t'other hand, there are some drawings of GWR S&C work in the report of the International Railway Congress meeting in 1900 (held in Paris) so that might be useful material to send when you have the time to look at it (that is, when you are not too busy practicing on producing 7mm representations of London shops and houses).
28ten
Guv'nor
10 minutes this morning and I have worked the planes and cutouts. there are a lot of subtle fillets and curves to be calculated yet. Graham, I dont suppose you have anymore shots of the chair you posted on the Gun st depot page?
Moulded key in or key out?
Ian, yes any shots would be helpful
Moulded key in or key out?
Ian, yes any shots would be helpful
Steve Cook
Flying Squad
Key out...go on, raise the bar...
28ten
Guv'nor
Would it make track laying difficult to accurately gauge?Key out...go on, raise the bar...
Simon
Flying Squad
Probably, keys in gets my vote, but apart from the additional moulding complications you then need two moulds or at least the ability to have either "key right" or "key left" - it's a nightmare!
Separate keys is great for a small diorama though and one could make a jig to solvent on the keys before track assembly - but maybe not if they are resin - aagh.
Flat bottom light railways are one answer but no good for one's beloved hydraulics
Simon
In da shop, taking a breather from packing parcels and waiting for several overdue deliveries
Dog Star
Western Thunderer
The answer to your question might depend upon the answer to this question... how are you going to achieve the gauge of the track in a consistent manner?
If setting to gauge involves rails in chairs then I think that you want to have keys in the chairs. If you intend to follow prototype GWR practice and attach chairs to a sleeper before the sleeper is placed on the track bed then you could go with separate keys. I wonder of there is any WTer who might have had experience of the Rocket Precision method of track making, in 7mm, with separate keys?
Graham
Dog Star
Western Thunderer
Sorry to ask... which chair? One of the prototype chairs or one of the moulded chairs? Happy to send a moulded chair if you so wish for Len Newman has produced a representation of the chair in the GWR proceedings (now with C&L rather than in the Exactoscale range).
regards, Graham
28ten
Guv'nor
the one on the bottom of this page
http://basilicafields.wordpress.com...-for-gun-street-depot-circa-1880-1905-part-2/
there is a bit of disused line at the Bulmers loop I will have to go over there later in the week when the rain has stopped
Assuming the results are satisfactory I can play about with it
Dikitriki
Flying Squad
If you are doing a chopped off left and right, are you not making an (invalid) assumption that the keys are knocked all the way through........
Keys in. Anything else is a recipe for problem gauge setting. Besides which, there is no extra cost for left and right handed chair units if you are having them printed.
Richard
Keys in. Anything else is a recipe for problem gauge setting. Besides which, there is no extra cost for left and right handed chair units if you are having them printed.
Richard
Dog Star
Western Thunderer
Ahh, that one. I am not sure if I have any more photos of that chair, I shall look later today or tomorrow. The chair in the photo is not too far from you... when I took the photos the chair was on the approach to Norchard, just inside the gate and on the RHS.
regards, Graham
Steve Cook
Flying Squad
Undoubtedly
Is it worth the effort or grief - well, thats a personal viewpoint and needs to take into account the total scope of the project.Graham's answer concerning the method of track laying sums it up better than I could, and also raises the question of whether anyone has experience of the Rocket Precision track - I'd love to know too
Steve