Subject:
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Re: Building a three-foot bridge
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Newsgroups:
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lugnet.trains, lugnet.znap
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Date:
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Fri, 24 Jan 2003 11:34:34 GMT
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Viewed:
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3548 times
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"Cary Clark" <cary@corp.nospamwebtv.net> wrote in message
news:H96p3M.I6q@lugnet.com...
> In lugnet.trains, Brian Kendig writes:
> > I want to build a bridge to cross a one-meter gap between two train
> > platforms. The bridge must hold two straight lengths of track, spaced
> > with one trackwidth between them (the distance there would be if you
> > snapped two cross-intersection track pieces together).
> ...
>
> Brian:
>
> I've built some ZNAP and Technic bridges of similar lengths but haven't • run
> into the twisting problem. Any chance you can post a picture of what you
> have? That would help a lot.
>
> Cary
Here are a couple of pictures of the ZNAP bridges Cary built along with one
I built.
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=50749
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=149776
Cary built the two bridges that cary the trains across the opening in the
NCLTC layout, I built the monorail bridge. When we set up for our first
GATS show one of Cary's bridges worked great and one didn't, it sagged a
bit. My monorail bridge was also structurally not sound. After we went
home that Friday night Cary made a second copy of the bridge design that
worked and I re-worked my bridge design completely. We have used all three
bridges at numerous shows since then without any problems.
While I have a tub of ZNAP, I didn't have enough of the parts that I would
have really liked to use so I had to be creative. For the bottom platform I
alternated triangle pieces such that two of them placed next to each other
formed a crude rectangle. I then joined these rectangles together with the
sides. At this point the bottom rectangles were not joined together with
each other so I used a seried of long ZNAP beams connected end to end on the
underside to create one long rib down the middle of the base. This turned
out well and it is very sturdy, the rib provides more than enough support.
You can't really see it in the picture but the rib follows the centerline of
the monorail track.
Mike
--
Mike Walsh - mike_walsh at mindspring.com
http://www.ncltc.cc - North Carolina LEGO Train Club
http://www.carolinatrainbuilders.com - Carolina Train Builders
http://www.bricklink.com/store.asp?p=mpw - CTB/Brick Depot
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Message is in Reply To:
 | | Re: Building a three-foot bridge
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| (...) ... Brian: I've built some ZNAP and Technic bridges of similar lengths but haven't run into the twisting problem. Any chance you can post a picture of what you have? That would help a lot. Cary (22 years ago, 23-Jan-03, to lugnet.trains, lugnet.znap)
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