Subject:
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Re: Bridge Building Questions
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Newsgroups:
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lugnet.trains
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Date:
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Wed, 2 May 2001 00:51:16 GMT
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Viewed:
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2094 times
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In lugnet.trains, John Gerlach writes:
> In lugnet.trains, James Powell writes:
> > > i've been pondering building a draw bridge between two tables. i was
> > > wondering if anyone else has tried that. it would be easy for 4.5v but i
> > > imagine you would have to custom make some rails to get the electrical
> > > conncetion for 9v or 12v.
> >
> > Hmm...lift bridges that I know of:
> > Mine
> > Ben Fleskes
> > GMLTC(?)
>
> The GMLTC had a bascule bridge on our last layout:
> http://www.brickshelf.com/cgi-bin/gallery.cgi?i=11083
> (there is a vertical lift bridge behind it, but that one didn't work very
> well... :-( )
>
> I don't have a picture of the bascule in the 'up' position, but I can
> explain it pretty easily. Pivot point is on the bottom left, the right side
> drops down between two 1x2 roof 'apex' pieces that force it to center to
> line up with the next span. It leaves a 1 stud gap between the tracks, but
> the trains jump that easily.
>
> The bridge was very well balanced, with something like 17 2x2x6 weight
> elements in the counterweight. The bridge was moved by a micro-motor
> attached to gears that hooked up with the horizontal bar from the top of the
> truss. The motor and the gears are hidden behind the black & green
> locomotive. The strings bracing the truss run through black technic pegs.
> Yes, we're not "purists", it's non-LEGO string. (gasp!) But we tried to
> find some string that looks like the stuff you'd find in a pirate ship set.
> And without the string, the truss falls apart!
>
> We built power clips onto the span to power the trains across, you can just
> make them out on the left side. They hooked up to the main track power
> between the two bridges.
>
> Only problem was there was no automatic power cut-off, so if the person
> running the bridge and the person running the train didn't communicate,
> things got somewhat messy... <grin>
>
> JohnG, GMLTC
The counterweight should also create a great obstruction to protect from one
side.
Josh
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Message is in Reply To:
 | | Re: Bridge Building Questions
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| (...) The GMLTC had a bascule bridge on our last layout: (URL) is a vertical lift bridge behind it, but that one didn't work very well... :-( ) I don't have a picture of the bascule in the 'up' position, but I can explain it pretty easily. Pivot (...) (25 years ago, 1-May-01, to lugnet.trains)
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