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In lugnet.technic, Paul Davidson writes:
> 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
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
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