Subject:
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Re: Drawbridge help needed!
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Newsgroups:
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lugnet.build, lugnet.trains
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Date:
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Thu, 28 Mar 2002 00:37:47 GMT
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Viewed:
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421 times
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In lugnet.build, Pedro Silva writes:
> I am currently building a small drawbridge for my train using Technic
> elements, but I came across a difficulty which I was not expecting to be so
> problematic: the need of a "counter-weight".
> I did know I was *probably* gonna need one. And that there are ways to
> calculate its weight and placement. Only I was expecting the gears would
> hold... which they didn't.
>
> Has anyone made some bridges like this, that I can use as reference? Mainly
> for the *shape* to use.
Pedro,
Here's my version of a draw bridge. Its the first listing under "Bridges"
on my site.
http://www.easystreet.com/~kjmrr/
Its a Bascule bridge based on a real one I had a picture of in some train
magazine.
I got the counter balance to work fairly well. I could balance it such that
it took very little force to lift the span. However, at this balance point
the track wouldn't stay level - the end of the bridge would be a couple of
inches up off the landing points. It would take some amount of force to
hold the span DOWN in that situation. So I left it unbalanced enough that
it held itself firmly in place as a train was crossing.
I was planning to motorize it, but never got around to it. My theory was
that with a motor, I could balance it more closely and the tension provided
by the gear train would hold the bridge in either the open position or the
closed position, whichever way it was left. I never really tested that
theory, but I still think it had a good chance of working.
Be sure to let us know how it goes.
Kim
P.S. I followed up to the trains group too, since this is a train bridge
and it seemed appropriate.
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Message has 1 Reply:
 | | Re: Drawbridge help needed!
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| (...) Your bridge has definately a very impressive mechanism. It does look a little fragile, but I'm pretty sure it holds solid (it holds a train, right? :-). It is very complex, nonetheless. Isn't there any simpler (so to speak...) solution? One (...) (22 years ago, 28-Mar-02, to lugnet.build, lugnet.trains)
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Message is in Reply To:
| | Drawbridge help needed!
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| Hi all, I am currently building a small drawbridge for my train using Technic elements, but I came across a difficulty which I was not expecting to be so problematic: the need of a "counter-weight". I did know I was *probably* gonna need one. And (...) (22 years ago, 28-Mar-02, to lugnet.build, lugnet.trains, lugnet.loc.pt)
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