Re: [ATM] Use of bearings in (static) mirror cells

[Mark Holm <mdholm@telerama.com>]

Certain combinations of materials do have velocity dependent friction. 
I strongly recommend an article in the October 2003 Sky and Telescope, 
pages 122-126, by Martin Lewis.  Martin performed measurements of 
sliding friction for several combinations of materials over a range of 
velocities.  His conclusions are too detailed to summarize briefly here. 
  If you are going to build a sliding bearing telescope (similar or 
identical to the "classical" Dobsonian design, you really should read 
this article.

If you can't get it at your public library, you can purchase it on line 
at S&T's web site.

-- 
Mark Holm
mdholm@telerama.com

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