Re: [ATM] Mirror Cells - Springs vs. Push/Pull

[Edwin Spector <ems@lucent.com>]

Jeff,

a decade back, I came up with my own solution to this question. I used a 
'differential screw' arrangement. Imagine a 6mm (1/4 inch) screw. Now reduce the 
diameter of half of it to 3mm (1/8 in). Then cut a 3mm thread on the thinner 
part. This screw passes through captive nuts in the fixed and movable parts of 
the mirror cell. The screw allows adjustment due to the difference in thread 
pitch. I used shake-proof nuts (with nylon inserts).

You could get a similar effect using a combination of left- and right-handed 
threads on the same screw.

Regards

Edwin
Bath, UK.
--------------

From: jeffmorgan@mindspring.com
<<
[...] I was wondering if there was any comments on using collimation pull bolts 
opposed by springs (which seems to be the predominate method) vs. using 
push/pull bolt pairs like refractor cells use.
 >>
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