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In lugnet.adventurers, Paul Davidson wrote:
> 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?
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 *not* be able to turn. Put a rubber band around the two pulleys.
Instant friction.
You'll want to use non-LEGO rubber bands, because they will wear out, and those
LEGO pieces are too expensive to replace.
You may need several pairs of pulleys...
Steve
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