2440x450 board.

Discussion of model railway baseboard design and construction
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THE CHIEF
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2440x450 board.

Postby THE CHIEF » Sun Mar 22, 2015 9:05 pm

I'm looking at building a board. 8ft in length and 18" wide as a one piece unit. Using 12mm ply braced with 2x1 would that be strong enough? Splitting it would be impractical due to track position.

b308
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Re: 2440x450 board.

Postby b308 » Sun Mar 22, 2015 9:14 pm

Strong enough?!!! Going overboard would be my view... 9mm ply sides and 6mm ply top would be fine with some 1"x1" bracing... Light and strong...

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THE CHIEF
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Re: 2440x450 board.

Postby THE CHIEF » Sun Mar 22, 2015 9:40 pm

Thought so. Its 6mm or 12mm I can get hold of. If 6mm will do as a top skin then I'll go for that with a 2x1 frame and bracing.

whynot
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Re: 2440x450 board.

Postby whynot » Mon Mar 23, 2015 9:20 am

What b308 says! In 12mm just the top would weigh near enough 20lbs.
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Emettman
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Re: 2440x450 board.

Postby Emettman » Mon Mar 23, 2015 3:29 pm

At 8' I'm pretty sure 2 x 1 bracing would not be rigid enough: it needs to be deeper, but if braced does not need to be anything like an inch thick.

If you have an eight-foot length of 2x1, try it between two trestles or other supports.

I think what you will need in wood is a couple of "spaced frame" girders from plywood to give adequate rigidity without impossible weight. About 4" deep, I should think.

Have a look at as discussion and some images here:
http://yourmodelrailway.net/view_topic.php?id=4842&forum_id=5&page=3
About a third of the way down is an image of the "spaced beam" concept, and near the bottom a picture of a different way of getting the rigidity, this time using triangular construction for the framing.

To get minimal weight with good rigidity and easy assembly my mad mind suggests using 2" insulation foam as the filler/spacer between the vertical plywood sides to form the girder, but that would involve making test pieces to see what the limits are, to avoid overkill.

Chris
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Last edited by Emettman on Mon Mar 23, 2015 6:32 pm, edited 1 time in total.
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THE CHIEF
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Re: 2440x450 board.

Postby THE CHIEF » Mon Mar 23, 2015 3:39 pm

I'm not sure I'd be able to cut that without a band saw. Would a jigsaw splinter the ply?

b308
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Re: 2440x450 board.

Postby b308 » Mon Mar 23, 2015 3:56 pm

I just get the woodyard to cut the wood to the right sizes, they tend to be more accurate then I am!

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alex3410
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Re: 2440x450 board.

Postby alex3410 » Mon Mar 23, 2015 3:59 pm

I used L girder constructionon my latest layout (build thread here) and have been really impressed with how well it supports the layout but more importantly how easy it was to get it all level (something i had trouble with on my old layout)

either way good luck with it :)


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