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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Tue, 30 Nov 1999 19:22:43 GMT
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Reply-To:
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CMASI@CMASI.CHEM.TULANE.EDUnomorespam
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Viewed:
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1287 times
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Jeff Elliott wrote:
> In lugnet.trains, James Powell writes:
> >
> > >
> > > 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.
> >
> > 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 end...stupid, but it works for now, and I doubt I will change it until
>
> If you use the chain links, you don't get the offset problem. Drape them
> over a driving gear and let the tail ends hang free (ie: don't wind them up)
>
> That version of the bridge was powered from the centre of the connecting truss
> at the top, and I had to use a differential (barrel of it rotation-locked) to
> reverse the directions of the two drive axles so that both ends climb at
> the same time. A side-effect was that I build an adjustment wheel onto the
> side of the differential that could adjust the height of one end with
> regard to the other by rotating the differential barrel.
>
> Jeff Elliott
Jeff,
Thanks for the idea for adjusting the height of one side of the bridge. I have
been using crown gears to send power to both sides of my bridge. When the dogs
kick it over it is a pain to adjust. You locked the drive axels together using a
1 stud long connector? (Sorry, I do not know the technic term for that little
piece.
Chris
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Message is in Reply To:
 | | Re: Building Bridges
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| (...) If you use the chain links, you don't get the offset problem. Drape them over a driving gear and let the tail ends hang free (ie: don't wind them up) That version of the bridge was powered from the centre of the connecting truss at the top, (...) (25 years ago, 30-Nov-99, to lugnet.trains)
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