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Cupla reasons...
Not sure if it would be cheaper or simpler to use pulleys....
The 2 gears + hubs cost all of AUD$40, straight off the shelf,
and fit to the scope like a bought one.
I have seen DIY pulley systems, but they all involved
having to make the large pulley yourself -
With the gears - there is no tedious mucking about with belts which can stretch and flex, creating wobble in the scope.
the "dakota starry nights" solution that i blatantly copied
seemed to be the easiest for me....
it is in fact being controlled by 2 motor controllers & potentiometers - i might go to computer control one day - but for now its good enough
cheers,
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