 | | Re: Lego orrery (mechanical solar system)
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"Thomas Johnson" <aklego@mac.com> wrote in message news:HE4DMA.1Eqy@lugnet.com... (...) cause i said something without any knowledge about the current state of the orrery i missed that the moon's orbit's not coaxial with the earth's one but as i (...) (21 years ago, 30-Apr-03, to lugnet.technic)
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| | Re: Vertical lift spans (was: Re: drawbridge
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(...) OK, this is similar, but first take a walk down to the local auto repair shop and see if you can look at a 'cats cradle' type auto hoist. Here is my description. It involves one string to lift one end of the span and another string, which is (...) (21 years ago, 30-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) I used a single motor, with all cables being passed above the top of the span to get to the far side (4 cables). One trick that I would do if I was building another one is to make the cable drums easier to adjust to one another, since they (...) (21 years ago, 30-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: New 2003 Technic sets on S@H
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(...) They do indeed have new pieces (to almost everyone). During my frenzied visit to the Toy Fair showroom, I spotted what I believed to be a new Technic piece (though I later found out that it's available in at least one Spybotics set). It's a (...) (21 years ago, 30-Apr-03, to lugnet.technic)
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| | Vertical lift spans (was: Re: drawbridge
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Not sure where to chime in, so I'll jump in here. Regarding the lifting of vertical lift spans: I've built many of these over the years and my latest version (yet to be published on the internet) takes advantage of an engineering survey done on one (...) (21 years ago, 30-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) I believe your are right Steven, if two identical motors were connected in an identical way they would run at the same speed provided they had identical loads. But nothing in this physical world is identical and that is why stepper motors and (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) Yes, roger that. I get it :-) I can easily write a sheet to do that. Actually, I have one! But it's geared towards an arched bridge with suspended deck. I'll get these sheets to the public soon! -TJ (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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(...) well since i was basing my theory of working with stereos and lights on my car, you have the uperhand...lol (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: drawbridge
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That might very well almost hold true (I am no expert) if your motors were hooked up like: [power]--------[moto...---[motor] (parallel circuit) But I have mine hooked up like: [motor]--------[powe...---[motor] (parallel circuits) I assume one motor (...) (21 years ago, 29-Apr-03, to lugnet.technic, lugnet.trains)
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| | Re: Lego orrery (mechanical solar system)
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(...) Apologies are not necessary--I agree that the moon mechanism is unsightly and I am looking for ways to clean it up for the nine planet version. Unfortunately (for orrery makers) the moon's orbit and earth's axis of rotation are not coaxial. (...) (21 years ago, 29-Apr-03, to lugnet.technic)
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| | Re: drawbridge
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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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