Subject:
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Re: Drawbridge help needed!
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Newsgroups:
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lugnet.build
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Date:
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Thu, 28 Mar 2002 22:58:38 GMT
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Viewed:
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417 times
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In lugnet.build, Ross Crawford writes:
> In lugnet.build, Pedro Silva writes:
> > My earlier attempts with Pneumatic cylinders failed. The use of a motor now
> > seems the cleverest option... but if you know different, please hint me
> > about it. I am really trying hard to do this bridge, and display it in
> > PLUG's August meeting.
>
> You can get LEGO weight elements (9936) from Pitsco. Very handy. Also, the
> counterweight doesn't have to go below the bridge - you can use cables with a
> pulley system, or something like this bridge at Constitution dock
> http://www.adagiomarine.com/year2001/images_hobartdocks/F00012.html. I wish I
> had a better shot of this - the bridge is in the bottom right, the
> counterweight is the large concrete block at the top of it - traffic passes
> underneath this.
I thought of using old "D-size" batteries; I used 4 of them, but they were
not even close to enough. I'm thinking of placing them higher, and maybe
"covering" the track with them - but, like I said earlier, space may become
a problem. My dad suggested I might want to use 1kg flour/sugar/rice as a
test-weight... after all, they are widely available, and can fit any space! :-P
With cables/pulleys, do you mean something like the drawbridges in Castles?
If so, I'd need a tower to connect them, wouldn't I?
The Hobart bridge looks close to what I'm trying to do. Is the concrete
block firmly connected to the bridge itself (ie, no relative motion is
possible between the two), or differently?
Pedro
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Message has 1 Reply:
 | | Re: Drawbridge help needed!
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| (...) From the side it looks a bit like this: +---+ | | | | <- counterweight | | +---+---+ <- hinge | | \ | \ | ---...--- <- bridge deck The sloped bit on the left is actually 1/4 circle, with teeth (curved rack), which is used to move the bridge. (...) (23 years ago, 29-Mar-02, to lugnet.build)
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Message is in Reply To:
| | Re: Drawbridge help needed!
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| (...) You can get LEGO weight elements (9936) from Pitsco. Very handy. Also, the counterweight doesn't have to go below the bridge - you can use cables with a pulley system, or something like this bridge at Constitution dock (URL) I wish I had a (...) (23 years ago, 28-Mar-02, to lugnet.build)
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