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Subject:	Any ideas on how to do this with Technic?
Newsgroups:	lugnet.technic, lugnet.adventurers
Date:	Tue, 30 Nov 1999 07:40:00 GMT
Viewed:	1026 times

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 that must sink will have gears that can roll up and down along long, vertically-oriented toothed "racks" which are part of the stationary base (the ground). Without any further mechanical apparatus, this will plunge downward at whatever acceleration gravity exerts, coming to a final crash at the bottom. Is there any kind of gearing I can add (without using motors) that can slow this motion? I.e., is there a way to have the structure *slowly* sink rather than suddenly? I've thought about adding resistance through a rubber band that is pulled taught as the structure sinks, but I'm not convinced this will work well. Perhaps some kind of hydraulics system? -- Paul Davidson

Message has 5 Replies:

		Re: Any ideas on how to do this with Technic?
(...) 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 (...) (25 years ago, 30-Nov-99, to lugnet.technic, lugnet.adventurers)

		Re: Any ideas on how to do this with Technic?
(...) 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 (...) (25 years ago, 30-Nov-99, to lugnet.technic, lugnet.adventurers)

		Re: Any ideas on how to do this with Technic?
(...) 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)

		Re: Any ideas on how to do this with Technic?
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 (...) (25 years ago, 30-Nov-99, to lugnet.technic, lugnet.adventurers)

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

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