[Lab] Model escalator...

[janick at bergeron.com]

Why bother reversing the escalators? If the figures will be stuck to the
stairs, they'll survive going all the way around. Build two escalators
using simple motors and keep driving them in the same direction. Use an
enclosure to hide the return path. If you must have a figurine upright
at all times, make a triangular belt so one is always upright at the
bottom of the "stairs" when the other disappears. 

On 2014-09-15 01:09, Adrian Jones wrote: 

> Anyone out there in 'makerland' got any ideas for me. 
> For an art project, my partner, Lise, needs me to build a pair of small
> model escalators that run against a projected backdrop. 
> Each escalator will have a small figurine, one ascending while the other
> descends.
> Rough estimates are that each elevator should be about 18-20" long with a
> 6-8" elevation. For each I've been thinking about using a stepper motor
> driving a loop of toothed belt. The belt has one or more small triangular
> balsa steps glued to it. The stepper will move in one direction (ascend),
> stop and then reverse direction (descend) to end up at the same point, while
> the other does the opposite. This cycle then repeats. 
> 
> /| /| /|
> / | / | / | <--> 
> ___==/==+==/==+==/==+===============___
> / / \
> | A | | B ||
> ___/ ___// 
> ==================================== 
> 
> Imagine pulley A elevated so that hypotenuse of triangur 'step' is
> horizontal... Get it?
> 
> Thoughts, suggestions... 
> 
> Many thanks, 
> 
> .... Adrian
> 
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