Re: ATM ALT bearing question

["Frank Ward" <thewards@mindspring.com>]

I  start with 100 paper and push down on the
bearing really hard with the paper attached to the
bearing by holding it there and pulling the bearing
around.....after everything is built and in place.  What
you are doing is preparing the teflon for your setup,
not a theoretical one. There will be minute changes
between the centers of each bearing depending on
your building accuracy.

For me it's like a "last item" and then I'm finished.

Frank Ward
Atlanta, GA
----- Original Message -----
From: Jim Miller <jim@jtmiller.com>
To: ATM <atm@shore.net>
Sent: Friday, August 03, 2001 10:51 PM
Subject: ATM ALT bearing question


>
> I'm designing the support for the ALT bearings on my DOB.  The separation
of
> the bearings is 70 degrees and the length of each of the four bearing
pieces
> of Teflon is 1.25" resulting in a nominal of load of 15psi as suggested by
> Kriege and Berry.
>
> The rocker diameter is 12" which results in a fairly shallow arc for the
> teflon.  I'm thinking about how to simply support this and am considering
> just making the supports flat (tangent to the rockers), gluing the teflon
to
> them and creating their mating radius by temporarily fixing a some 400
grit
> carbide paper to the rockers and wearing in the bearings to the proper
> radius.  Of course this would all be done prior to mounting the mirror!
>
> Thoughts, suggestions?
>
> tnx
> jtm
>
>