> ...I hope this work description works for you...

Perfectly! Thanks, Doc.

Next question: why use a worm in the first place if it's so difficult to
get it right? A worm is an easy way to get a large reduction but a series
or regular gears will do the job, too.

Also, GEM manufacturers like to brag about how big their gears are. Why
does this matter?

Finally, why is it seemingly so hard to make good gears? From a software
point of view :-) a gear is just a silly hunk of metal with a funny shape
that ought to be easy enough to cut with CNC machine: set it up, pump out a
hundred pieces per hour. What am I missing?

--
Emerald Hills, CA USA http://nineplanets.org/

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