LEGO SYSTEM Adventurers : 558


Adventurers / 558	557 \| 559

Subject:	RE: Any ideas on how to do this with Technic?
Newsgroups:	lugnet.technic, lugnet.adventurers
Date:	Wed, 1 Dec 1999 17:05:31 GMT
Viewed:	17 times

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 one end of its travel, the pendulum hangs down. As the platform moves, the pendulum is lifted and the resisitance it provides is proportional to the sin (sine) of the change in angle. Try it yourself with a brick. Hold the brick and let your arm dangle. Now move your arm in an arc. The first few degrees are pretty easy, but as you move closer to 90 (horizontal) the "weight" - really the effort - to move your arm is larger. Does this help? Cheers, Ralph Hempel - P.Eng -------------------------------------------------------- Check out pbFORTH for LEGO Mindstorms at: <http://www.hempeldesigngroup.com/lego/pbFORTH> -------------------------------------------------------- Reply to: rhempel at bmts dot com --------------------------------------------------------

Message has 1 Reply:

		Re: Any ideas on how to do this with Technic?
That's a good solution as well. It might be harder to make the descent really slow, though, as is possible with a clock-style pendulum. -- Paul Davidson, aka Tinman www.theforce.net \| Your Daily Dose of Star Wars www.filmforce.net \| Your Daily (...) (25 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)

Message is in Reply To:

		Re: Any ideas on how to do this with Technic?
(...) 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 (...) (25 years ago, 1-Dec-99, to lugnet.technic, lugnet.adventurers)

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