Re: Geared Dobsonian question
Mel Bartels (mbartels@efn.org)
Mon, 6 Mar 95 14:16:57 PST
I have used roller bearings to reduce friction on my dobs
for years. For manual dobs, I let 2/3 of the contact pts
be roller bearings and the other contact pts the standard
formica/teflon. This cuts the friction down on very large
dobs to a more managable level.
For my computerized dobs, the 3rd point is a machined conical
shaft attached to a precision gear reducer. With the roller
reduction of ~40:1 and the gear reducer of ~60:1 giving a
total reduction of 2400:1, one can attach motors directly
to the gear reducer input shaft without need for further
gearing.