One of my good tech friends has been keeping an eye out
for gearbox reductions and clutches etc after I described my
successful worm drive to him.
He gave this to me and said, "is this any good to you?"
It has a 30v DC motor with a drive clutch straight on the
back, driving a seriously well made, heavy duty brass gear
train. And a position feedback just prior to the output shaft.
With a few simple mods like:
Stepper in place of DC motor,
Rotary feedback pot swapped for optical encoders,
Output shaft driving a worm/worm gear,
...it could easily be the drive for a rather large GEM.
One man's junk... eh
Steve