 | | Drawbridge help needed!
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Hi all, I am currently building a small drawbridge for my train using Technic elements, but I came across a difficulty which I was not expecting to be so problematic: the need of a "counter-weight". I did know I was *probably* gonna need one. And (...) (23 years ago, 28-Mar-02, to lugnet.build, lugnet.trains, lugnet.loc.pt)
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| | Re: Drawbridge help needed!
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(...) Pedro, Here's my version of a draw bridge. Its the first listing under "Bridges" on my site. (URL) a Bascule bridge based on a real one I had a picture of in some train magazine. I got the counter balance to work fairly well. I could balance (...) (23 years ago, 28-Mar-02, to lugnet.build, lugnet.trains)
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| | Re: Drawbridge help needed!
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(...) Your bridge has definately a very impressive mechanism. It does look a little fragile, but I'm pretty sure it holds solid (it holds a train, right? :-). It is very complex, nonetheless. Isn't there any simpler (so to speak...) solution? One (...) (23 years ago, 28-Mar-02, to lugnet.build, lugnet.trains)
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| | 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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| | Re: Drawbridge help needed!
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(...) LEGO weights are great but can cost some bucks, $4.95 a pair (2K2 catalog) and that excludes shipping. (Save the money for Technic beams) Low cost alternative, and I've heard the train guys mention this, roll of pennies. Just make a container (...) (23 years ago, 28-Mar-02, to lugnet.build)
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| | Re: Drawbridge help needed!
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(...) Actually, its quite solid (or was - it is nolonger with us, may it rest in peace). Held two trains (its a double track bridge) quite easily, no problem. The counterbalance mechanism was quite study also. (...) Hmm... Well the space is mainly (...) (23 years ago, 28-Mar-02, to lugnet.build, lugnet.trains)
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| | Re: Drawbridge help needed!
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(...) The latter. I'm not sure if I can fit such a big structure behind the bridge, since it is possible that other structures may interfere with that placement of the counterbalance mechanism (namely, a possible crossing viaduct). I dunno, I must (...) (23 years ago, 28-Mar-02, to lugnet.build, lugnet.trains)
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| | Re: Drawbridge help needed!
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(...) 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 (...) (23 years ago, 28-Mar-02, to lugnet.build)
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| | 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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| | Re: Drawbridge help needed!
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(...) (You are so right, ASCII art is difficult to see in Lugnet with IE5!) I think I got the idea. Curiously, I'm designing a garage door that resembles this, but in a different position... :-) There is a problem with this design, though: how will (...) (23 years ago, 29-Mar-02, to lugnet.build)
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