[ATM] ATM: Kinematics

["David Harbour" <scarab2@cox.net>]

To all-

One of our members, who requested some of those pictures I found of the
components of my large, one person transportable, fully latitude adjustable
fork equatorial mounting for optics up to 20" aperture, asked a question
about how the big, hollow, steel polar axle is carried in the bearings (the
picture showing the undercarriage and polar axle latitude rocker did not
show this well) and I directed him to the article, at the beginning of my
page about free bearings, to read the short introduction about how to carry
a big axle on five little bearings arranged kinematically. I directed him to
this bearing catalogue (bearings I gave away to all the list members who
needed them) where the little article about mounting a big axle on little
bearings kinematically was:

http://www.atmsite.org/contrib/Harbour/Brngz.html

But just in case that article didn't make the concepts clear, I prepared
another little note with some large pictures in it (three) that explains it
well, if any of you guys would like to see it (if the article above wasn't
clear enough). All pictures on that page will enlarge to full screen with a
regular mouse click.

Davey



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