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(...) the length of the wire has nothing to do with the speed. the problem is that one motor, the first one on the line, is getting most of the power. the motor at 9v, 12v or 115v that doesn't mean thats the exact amount of power that it uses, it (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) I've thought of a simpler way of describing my system. Basically you have a rope stretched between two towers. If you pull the rope the span goes up, release it and the span goes down. The wire is connected to the lift span at both ends via (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) my description was not that good. here is how the diagonals are on my bridge: / | \ | \ | \ | \ | / | / | / | / | \ and the diagonals in the spreadsheet: / | \ | / | \ | / | \ | / | \ | / | \ (hope my ascii art turns out ok) so only 2 of the (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) I don't follow. It appears your diagonals go in both directions, mirrored about the center of the bridge: (URL) did you mean that your diagonals go from top right to bottom left (looking at the right-half of a span), and the diags on my (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) Ok, here's my idea for a solution for a vertically lifting bridge. All you need is one winch connected to one lifting line. You also need one control line(running off the same motor but geared down 2:1). The lifting line goes up the first (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: New 2003 Technic sets on S@H
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Have to take a new standing acording to what I said about the new Technic sets. I have bought one 8451 and one 8453, they actually have lots of details even if they are small size. They look very nice actually. But I still think they have to few (...) (21 years ago, 29-Apr-03, to lugnet.technic)
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| | Re: drawbridge
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(...) i'm using eudora to read and send to the news group. that is probably what my problem is. ¤º°`°º¤ø,¸¸,ø¤º°`°º¤...¤øø¤º°`°º¤ Bob Kojima ko@fial.com (URL) Incorporated Telecom Monitoring Solutions 4343 SW Corbett Ave Portland, OR 97201 (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) your spreadsheet is awesome. it worked great for calculating the length and heights. the only small problem was that the diagonal braces on my bridge all go in one direction, which your spreadsheet does not model. so your spreadsheet could (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) the rails on the lift span are not connected to the rest of the rails. there is a separate power connector run to the rails on the lift span. since the rails are not connected, there slopes on the sides to help keep the rails aligned when the (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) Thanks for the tip, I guess we'll cross that off our "to try" list! JohnG, GMLTC (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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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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