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topic: 2791representing Irish light weight flat-bottomed chairs
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posted: 23 Nov 2015 19:48

from:

madscientist
 
 

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Common throughout the system in Ireland , till recently was the use of light weight flat-bottomed rail for less important sidings and MPDs etc

They were fixed to the sleeper by a flat chair and the rail was then secured using two chair screws ( one inside and one outside )

I include picture for reference:

2_240807_360000000.jpg2_240807_360000000.jpg 

Note that another similar common chair had a slightly more raised ( cast ) piece under the chair screw , as these ones look just like a flat plate

Is there anything in 4mm that could be used to represent this type of chair or its near equivalent

I was thinking of using code 55 for the rail as well


thanks

Dave
attachment.php?id=2176attachment.php?id=2176

posted: 23 Nov 2015 21:24

from:

wcampbell23
 
Hamilton, Scotland - United Kingdom

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Hi Dave

Perhaps not ideal for code 55 rail but Brassmasters does rail baseplates in etched brass intended for Peco codes 75, 80 or 82 rail.

Details at:

http://www.brassmasters.co.uk/track_details.htm

Regards.

Bill Campbell
Last edited on 23 Nov 2015 21:28 by wcampbell23
posted: 24 Nov 2015 00:51

from:

madscientist
 
 

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thanks

Yes I looked at those , The "spike" is more a US version , whereas the Irish /UK is a chair screw( bolt).

Maybe I can get a custom etch

posted: 24 Nov 2015 12:47

from:

Matt M.
 
Australia

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Hi Dave,

A custom etch is probably the only way other than cutting them out by hand.
All the US suppliers for HO or quarter scale make US style mainline types with
four or eight holes etched in them.

The plate may also be shaped with an inclined to throw the rail over to the required cant.
1 in 20 here in NSW.
Not necessary, nor easy to model in 4mm.
If laying the track using the rivet method you could slip half plates on either side
of the rail after soldering. You could use plastic or paper to represent them at that point.

I would suggest doing a trial section to see if any of this is worthwhile.
Even in 7mm the plates aren't that easy to see at normal viewing distances.
They are hard to spot in photographs of the prototype done at a normal viewing distances.

The screwspike you may be able to replicate with something from Grandt Line
but I have a feeling that you may require something smaller than they supply.
A Shapeways 3D print may work there.

With your version of a plate with "slightly more raised ( cast ) piece under the chair screw",
that is a plate with a shoulder. It can be a single shoulder or a double shoulder.
If single, the shoulder is usually located on the outside of the track. It is to help control
lateral movement and lets the screwspike only having to supply the clamping force.

Regards, Matt M.

posted: 24 Nov 2015 21:22

from:

madscientist
 
 

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Thanks. I have a better photo taken recently , still in the camera card , I'll upload it for info, tomorrow



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