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Chain: been there done that, it wasn't a pretty sight... Lego chain is not strong enough for the weight and forces a lifting mechnism will put on it. I tried chain on my lift bridge before eventually moving on the string. I bought over $120 worth of (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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In lugnet.technic, Christopher Masi writes: <snip> (...) The GMLTC tried that on our previous layout. We had a motor mounted in the span, geared down to technic 8-tooth gears on each corner. The gears would engage this piece: (URL) (1x20 gear rack) (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) In my view one of the simpler ways is to shaft connect the two motors if you can... You can hide it if you have the sort of lift bridge that has an upper connection between the two towers. It may not always work though. (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) That is a nice bridge, but I was chiming in to comment on syncronization... Has anyone tried using a single motor, and putting the motor in the span? I know it isn't prototypical, but if the motor was in the span, and the string/chain was (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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I just got through purchasing 4 rotation sensors for that very reason for my lift bridge ((URL) - in Creations). I will be adding the 4 rotation sensors and an additional rcx to my bridge sometime this year. Out of 32 motors, I could never get 2 (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) I hope my bridge design spreadsheet worked okay for you. Your trusses look good! Nice work. Very nice! (...) I've hit a similar problem in planning out a crane. I've contemplated using two separate winches to lift the main hoist, but just like (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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Very nice. We had a lift bridge in our last display as well, but it couldn't run very many times before the crawlers would de-synch. This is the best pictures of our new ones that I have: (URL) like it because it looks like Ross Neal is pushing the (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | The Jamocklaquat
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The Jamocklaquat - Technic Fig Scale Mecha - Fully Articulated Mindstorms Robot - 41 Motors - 1 VC - 12 RCX - 1 Scout - 2 Control Centers - 50 Inches Tall - More Pictures Soon - ;) (URL) (21 years ago, 29-Apr-03, to lugnet.build.mecha, lugnet.announce.moc, lugnet.technic, lugnet.robotics) !!
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| | Re: drawbridge
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(...) And they still get added. I think there are something faulty with the configuration of your news reader. It seems to add a lot of HTML or other code to translate some carachters. Best regards, /Tobbe (URL) SPAM when e-mailing) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) Regarding the bridge: How do you disconnect the rail when it's time to raise the bridge? That was a very odd way to raise it BTW, I've never seen that before (but then again I don't have a fetich towards bridges as of yet). And you have waaay (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: vht
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(...) :) (...) And a fireing gun! I can vouch for the 1:1 speed as well. My first tank used the same gear ratio and motors. (...) Mmmm... Destructive! Best regards, /Tobbe (URL) SPAM when e-mailing) (21 years ago, 29-Apr-03, to lugnet.technic)
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| | Re: Lego orrery (mechanical solar system)
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groovy good job i like the earth maybe you could try to use one of the lego clock hands mechanisms you know the coaxial mechanism to hide the moon gearing under the earth globe sorry i'm advicing but that is because your moc inspires me much br (...) (21 years ago, 29-Apr-03, to lugnet.technic)
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| | Re: Lego orrery (mechanical solar system)
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"Thomas Johnson" <aklego@mac.com> wrote in message news:HE2LDp.5xJ@lugnet.com... (...) I was going to try and write more, but I can't think of anything to say, other than this is really, really cool. :) Fantastic work! Iain (21 years ago, 28-Apr-03, to lugnet.technic)
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| | Re: Lego orrery (mechanical solar system)
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Tom, I never knew what that was called. Your model is wonderful. Thank you for sharing. Bob (...) (21 years ago, 28-Apr-03, to lugnet.technic)
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| | Lego orrery (mechanical solar system)
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Greeting all, I've been lurking here for years and finally decided that I'd built something worth sharing: (URL) orrery was made to demonstrate why daylight varries so much here in Alaska. The inclination of the earth's axis as well rotational (...) (21 years ago, 28-Apr-03, to lugnet.technic) !
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| | Re: drawbridge
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(...) yes thank you for fixing the link. some how some extra characters got added in to the link. i will be showing this at a talent show on may 10th. i just finished it yesterday. it was such a nice day outside and i don't really have a flat (...) (21 years ago, 28-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) or did you work from memory or? Did you have any challenges in keeping the two motors sychronized? That's been a bugaboo for others, that one side or the other raises a bit too fast and skews things. I think this is my fave shot: (URL) thanks (...) (21 years ago, 28-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) (21 years ago, 28-Apr-03, to lugnet.technic, lugnet.trains)
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| | drawbridge
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hi everyone, a friend asked me to build a drawbridge for a train display. so this is what i came up with: (URL) is loosely based on the Hawthorne Bridge in Portland Oregon: (URL) are 3 spans. each span is 96 studs long. the center section lift is (...) (21 years ago, 28-Apr-03, to lugnet.technic, lugnet.trains) !
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| | vht
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Greetings fellow builders! Here is the versatile heavy-duty tank! well.. what to do with ny time now that I have finished my exam-projects.. how about a little remote controlled tank to play with? (URL) course both tracks and cannon are (...) (21 years ago, 28-Apr-03, to lugnet.technic)
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