Re: ATM Ball-and-Socket flotation for mirror cell

[don clement <donald_clement@yahoo.com>]

Hi Nick,

An alternative to using Teflon ball and socket could
be to use a solid machined compliant (flexural pivot)
universal joint. The compliant universal joint would
be simple to make: mill a solid shaft such that there
are two thin rectangular sections at right angles to
each other. Each thin rectangular section of the shaft
would constrain movement in one direction only. No
backlash and no creep from the Teflon as there are no
sliding parts. Also possible to turn a thin circular
section of the adjustment rod that would act as a
compliant flex pivot.

Don Clement
San Diego/Running Springs


> I've put up a web page showing a ball-and-socket
> design for the collimation 
> bolts on my mirror cell.  Originally it was built
> according to the 
> Kriege/Berry book but I had problems with the
> triangles lifting when I'd 
> turn a collimation bolt.
> 
> Here's the page:
> http://homepage.floodcity.net/users/nickz/


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