Subject:
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Re: Building Bridges
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Newsgroups:
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lugnet.trains
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Date:
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Sun, 28 Nov 1999 22:14:07 GMT
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Viewed:
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1290 times
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In lugnet.trains, James Powell writes:
>
> > The reason for the climb, btw, is that I needed to put machinery under
> > the track to support a lift-bridge that spans a hallway; the ledge is
> > 5', and when idle, the train needs to allow, say, 6'6" clearance. This
> > is simply too high to build a permanent bridge, so I've built a vertical
> > lift bridge to span the 28.75" gap that carries two parallel tracks.
>
> A lift bridge or a draw bridge?
Lift Bridge. I'm actually on my second version; the first was lifted by
long chain-link chains and powered from the top of the towers. It only
carried a single track, and the deck was quite light, and a little flimsy.
I ran into difficulty with the fleixibility - when the centre of the
bridge depressed (eg: when the engine got there) the tips of the bridge
would rise slightly - enough to derail the car that was passing over,
at high speeds.
The current edition is very stiff, carries two tracks, and uses a rack and
pinion system at each end to crawl up the towers.
>
> >
> > Another question - have people met with any trouble using a Mindstorms
> > unit to control their trains? I'm looking to use one to control the
> > lift bridge, and I thought I'd dual-purpose it. Consider that I might
> > be powering 2 trains over 4 power connectors and about 150 pieces of
> > track.
>
> Why would you use mindstorms to control the bridge except perhaps as a aproach
> sensor? It's easier to do that with manual blocks, than with electronics.
> Although, I suppose you could get it to work fine.
Largely because of the social situation - this layout is at work, and the
people there are more careless than I am. They're prone to run the train
too fast, or run it with the bridge up (!), etc. I want a fail-safe to
ensure the train doesn't go too fast, and that it only moves with the
bridge down. I've considered using an all-mechanical system, but I might
want to use the robotics features later, to handle automatic stops, etc.
> James P
Jeff Elliot
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Message has 1 Reply:
 | | Re: Building Bridges
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| (...) I'm using strings, and have problems with them not winding evenly. This then causes one side or another to be higher than the other. End to end isn't too bad, but I did not leave in any way to ajust a single string save much hassle at one (...) (25 years ago, 29-Nov-99, to lugnet.trains)
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Message is in Reply To:
| | Re: Building Bridges
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| (...) A lift bridge or a draw bridge? (...) Why would you use mindstorms to control the bridge except perhaps as a aproach sensor? It's easier to do that with manual blocks, than with electronics. Although, I suppose you could get it to work fine. (...) (25 years ago, 26-Nov-99, to lugnet.trains)
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