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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 (...) (25 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, (...) (25 years ago, 30-Nov-99, to lugnet.technic, lugnet.adventurers)
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| | Re: Any ideas on how to do this with Technic?
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(...) Counter-weight through a pulley or gear system? A lessening counter-weight (classic sand displacement)? Bruce (25 years ago, 30-Nov-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 (...) (25 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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| | Re: Any ideas on how to do this with Technic?
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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 (...) (25 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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| | Re: Any ideas on how to do this with Technic?
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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 (...) (25 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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| | Re: Any ideas on how to do this with Technic?
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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 (...) (25 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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| | Re: Any ideas on how to do this with Technic?
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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 (...) (25 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)
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| | Re: Any ideas on how to do this with Technic?
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(...) That's where the friction in the pulley comes into play. Your system will need to accelerate initially to attain some sort of velocity. The friction will eventually (and pretty quickly if you fine-tune it right) counter act the acceleration, (...) (25 years ago, 2-Dec-99, to lugnet.technic, lugnet.adventurers)
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