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I'm thinking of having the gears on the moveable structure itself connect to the pendulum...I'm not sure yet how much friction there will be, I may need to use a lot of lego on the structure to make it heavier. -- Paul Davidson, aka Tinman (...) (26 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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Hi (...) One of us is going daft and I suspect me. Which strange, thick white gear in the RIS??? Or is this in the 1.5 version?? Mike (26 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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If you want to vary the rate at which an object of constant weight moves, why not use a mechanism like an old postal scale. No, not the kind that shoots you when you look at it sideways... It involves a pendulum mounted so that when the object is at (...) (26 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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(...) I may very well be wrong, but I don't think this will give the desired effect. The friction inside the gear is quite high when there is no motion, which may be a problem when the mechanism is triggered. And what's more, I don't think it will (...) (26 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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(...) It wasn't me, 'twas Steve Bliss. (...) This sounds like a very interesting project indeed! You should report back if you succeed with this. You need to connect the weight of the base to the pendulum. How are you going to do that? You can have (...) (26 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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(...) That strange, thick, white gear in the RIS slips with drag that appears proportional to the rotation rate, so it's a dampener, which is what you want. Dave Paule (26 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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I see. I understand what you're saying. The main thing I'm looking for in this case, though, is a constant downward speed which does not accelerate. Your ideas are interesting though, I will probably incorporate them into future projects (a working (...) (26 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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(...) Not entirely true. Your thinking of the "what falls faster, a tonne of lead or a tonne of feathers" question (or - "what's heavier, a tonne of lead or a tonne of feathers") which is actually more complicated than it seems. The thing with a (...) (26 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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A counterweight doesn't change the speed at which something falls, does it? It may reduce the apparent weight of the main structure, but objects of different weights fall equally fast. -- Paul Davidson, aka Tinman www.theforce.net | Your Daily Dose (...) (26 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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(...) Counter-weight through a pulley or gear system? A lessening counter-weight (classic sand displacement)? Bruce (26 years ago, 30-Nov-99, to lugnet.technic, lugnet.adventurers)
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I've received some very good responses here. Jacob Andersen's worm gear idea is what I would do if I were to use a motor, but since gravity already provides energy for the system, a good engineering solution would not use an additional motor. Plus, (...) (26 years ago, 30-Nov-99, to lugnet.technic, lugnet.adventurers)
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(...) to (...) quantity (...) Amazon.com now has set 5909 available for $19.99. Better grab it soon, since I don't think they'll last. Kevin (26 years ago, 30-Nov-99, to lugnet.adventurers)
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Paul Davidson: [ Structure sinking into the ground at constant speed ] I would see if I could do something with some worm screws (LDraw part 4716), a micro motor (LDraw part 2986), and maybe some gear racks (LDraw part 3743). The worm screws will (...) (26 years ago, 30-Nov-99, to lugnet.technic, lugnet.adventurers)
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(...) You can use an pendulum clock to time the mechanism so that it sinks at a constant speed. No, I'm not kidding! Take a look at Leo Dorst's LEGO clock: (URL) only need the pendulum, escapement and cogwheel part. The idea would be to use the (...) (26 years ago, 30-Nov-99, to lugnet.technic, lugnet.adventurers)
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(...) Hmm. Use a pair of pulleys, one attached to the same axle as the gear being turned against the rack. The other pulley should be attached to the same frame as the first, so they move together as the building sinks. This second pulley should (...) (26 years ago, 30-Nov-99, to lugnet.technic, lugnet.adventurers)
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(...) Well, I know you don't want to use motors....but.... :) I just picked up a 3038 "Spider Slayer" set, and the motor therein is actually quite weak - put a wheel on the axle and it spins real easy. If you built your gear mechanism then hooked (...) (26 years ago, 30-Nov-99, to lugnet.technic, lugnet.adventurers)
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Hi, I'm considering an Adventurers-themed Lego project that involves a structure that, when triggered, can sink into the "ground" (as on The Mummy). My general idea is that at four locations (two on each of opposite sides), the part of the structure (...) (26 years ago, 30-Nov-99, to lugnet.technic, lugnet.adventurers)
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(...) Wow! I had plans for a WWI tank. Now I even has the instructions. Christian (26 years ago, 30-Nov-99, to lugnet.adventurers)
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James Howse <jehowse@yahoo.com> wrote in message news:FLwBsq.693@lugnet.com... (...) some (...) great (...) about 6 (...) start. You're right, I'd forgotten about that one. With a middle prop, it would be very much like the Temple of Doom plane. (...) (26 years ago, 28-Nov-99, to lugnet.adventurers)
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(...) Have a look at the new plane for next year. A large red/grey sea-plane about 6 studs, it's in the 2000 catalogue,top middle/right (URL) looks like it could go the distance. If not, it's a great place to start. James from Oz. P.S. as for th WWI (...) (26 years ago, 28-Nov-99, to lugnet.adventurers)
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