Re: [ATM] New minimalist single-pole 18" ultralight

["Mel Bartels" <mbartels@bbastrodesigns.com>]

> Only one bearing is required to provide the dob-like friction, and the
> other pivot point can be quite simple.  For scopes with a low center
> of gravity this saves the added complication of making another
> bearing, and provides a more stable and rigid attachment point for an
> altitude encoder.


I tried this with my 20 inch in 1996 and did not like the results.  The
single altitude bearing point on one side seem to set up a resonance between
mount and tube assembly.   I discarded it after a few months of
experimentation.  Perhaps my implementation was not the best.

See http://www.bbastrodesigns.com/20inch-3armsideview.jpg for the side with
the single bearing point altitude.  http://www.bbastrodesigns.com/95osp.jpg
shows the other side of the mount before I experimented with this design.

Mel Bartels


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