Double track width and materail

Dinas Bryn said:
I have to set up a 2 track section, how wide of board do I need and what sort of materail would you use? Les
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For R3 and above the track centres are 18.5 cm, so I would triple this and use say 56 cm....
 
Just been out lLes. R1 to R2 centre to centre 7 3/4" (197 mm)
 
Looks like I wasn't too far out when I guessed at 7" centres then for NG.

:thumbup:
 
Philbahn said:
Just been out lLes. R1 to R2 centre to centre 7 3/4" (197 mm)
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On my layout, with R1/R2 curves and points, the track centres are 16.5 cm, so maybe a 50 cm board width would suffice....
 
I used 2X12 boards for my double track sections..........
 
Philbahn said:
Just been out lLes. R1 to R2 centre to centre 7 3/4" (197 mm)
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I think problems arise where there is a reverse curve as we found on Phil's layout today. Long and wide stock generally clears his catenary posts except at one point if some stock is reversed. Whereas stock with a long overhang will pass OK forwards, in reverse there is a tendency for the bogie to slew pushing a corner out and causing it to foul the post.
I had the same problem with a bridge abutment, it was well clear in one direction but got hit when approached from the opposite direction.
Trial and error needed or a wide track spacing.
 
Hi thanks for your commenrs, CME said a 12" plank would be enough so going on what you said Phil he is right? do they make a 12"board? he says they must to do it for soffet? I was doing so well until he came this lunch(joking ofcourse) Les
 
a Twelve inch plank is perfect but a soffet board? I would think it will warp like a pretzle outside, Thats why I used pressure treated 2in X12in Redwood. but if your indoors I dare say something thinner will suffice
 
minimans said:
a Twelve inch plank is perfect but a soffet board? I would think it will warp like a pretzle outside, Thats why I used pressure treated 2in X12in Redwood. but if your indoors I dare say something thinner will suffice
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The plastic composite soffit boards seem dimensionally stable.
I have had several offcuts outside and just propped against atree for over 5 years and they are as good as when they were delivered. I don't think they come cheap though.
 
Hi Keith, my Keith said timber but I have never heard of 12" timber in the UK, I have used shutting ply here but as he is in a wheelchair it is too big for him to cut and we wouldn't use that much, 2" thick redwood I wish, I would hve to take a morgage out for that timber Les
 
Les think I would prefere to go a bit wider . May be up to 14" just so the locos not on the edge.

Think the best solution is special plywood. They use it on wagon flooring. Just trying to think of the trade name. Don't even think of "normal" exterior ply. Todays ply is like blotting paper. Soaks up water and blows apart in a similar way to MDF when that gets wet. Itwould of coarse need a base or frame work to support it.

If you took the width up to 16" you could get 3 x 8ft rippings out of one sheet plus a bit of added safety if a loco derails
 
For mine, I used OSB (oriented strand board) that's often used in roofing, 19mm thick on a wood frame, then covered with roofing felt cap sheet. See my layout in "Problems on the T.V.B.L." on here.
 
i used marine grad ply on 3 inch fencing posts (round) banged into the ground with a post banger. The ply lasted more than 10 years outside without any real sign of deterioration. Its expensive but when I tried external grade for an extention it was delaminating within 2 years. Luckily we moved before it had to be replaced.

AC
 
Philbahn said:
Les think I would prefere to go a bit wider . May be up to 14" just so the locos not on the edge.

Think the best solution is special plywood. They use it on wagon flooring. Just trying to think of the trade name. Don't even think of "normal" exterior ply. Todays ply is like blotting paper. Soaks up water and blows apart in a similar way to MDF when that gets wet. Itwould of coarse need a base or frame work to support it.

If you took the width up to 16" you could get 3 x 8ft rippings out of one sheet plus a bit of added safety if a loco derails
Click to expand...

I think your talking about phenolitic ply. It uses a special phenolitic resin as glue. Pretty bomb proof it is.

Try this link. http://www.southern-timber.co.uk/gbu0-prodshow/ply_phenolic.html
 
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