Now that's the solution I've been looking for.
Thank you.
Having the servo mounted on the sliding tray
is the way to eliminate the pulleys and such
associated problems.
I'm thinking to make the servo travel reach
its end before the tray reaches its limit to
avoid the need for stop switches.
With nyrods sliding over thick music
wire rods, there should be no flexing
or binding.
The whole setup should be very simple,
with very little to cause failure.
The only things I still need to consider
are how to handle unexpected events
like bad landings. The sliding weight
could cause a lot of damage. The
mountings and cables may need
considerable engineering to handle
the loads without themselves causing
further damage.
I'm running it through my mind, and
possibly the best solution is to make
a cushion to catch the weight, rather
than trying to restrain it with stronger
cables and mounts.
Jenny