Re: [ATM] ?Glued Mirror Cell

["Jan and Rod Shea" <jnrshea@comcast.net>]

----- Original Message ----- 
From: "Thomas A Simmons" <tasimmons@raytheon.com>
To: <atm@atmlist.net>
Sent: Wednesday, September 15, 2004 7:33 AM
Subject: Re: [ATM] ?Glued Mirror Cell


>
>
>
>
> Hi Jan and Rod,
>
>  Richard told me NEVER to reveal his magic, but since you let the
> cat out of the bag, it was his patent and a few off list messages
> that inspired this cell. I didn't follow his recipe on the collimation
> bolt, as the off-the-shelf screw didn't require soldering and all that.
> Simplicity at it's finest!
>
>  You asked
>
> "Do I understand that you made the collimation bolt - bar
> pivot point by basically countersinking the mirror side of the hole
> through the bar, and RTV'ing the ? flathead machine screw into the
> hole by gluing the screwhead into the countersink?"
>
> Yep. I don't remember the screw type, but it was a 5/16 screw with a
> 3/4 inch or so flat top and perhaps a 135 degree champher underneath.
>
> You then wrote
> "Seems like you could back it up by putting a locknut on the
> underside of the bar spaced a little way back, and glued to the bar
> as well."
>
> Weeeellll, this is un-necessary. In sequence from the bar I have a flat
> washer, followed by a spring, another flat washer, the bottom of the
> mirror box, a nylon washer and then a wing nut. The spring came from
> MSC and is rated for ~30 lbs. The first springs I used were too soft,
> and allowed the mirror to shift somewhat. The nylon washer under the
> wingnut allows very smooth adjustments with low resistance.
>
> I believe you mentioned Tom Kracji's web page, which goes in debth into
> Richards patent and cell design. All I can tell you is that it works
> very well with this 25 pound mirror.  Maybe $5 in parts?
>
> Another tip. I believe Mark Holm is the author of "Cell Parts". I used
> this program to print out paper templates, thus simplifying the task
> of assuring the three bars were identical and the holes were properly
> positioned. (Ellen was mentioning something along this line the other day)
> With a little creativity, you can also set the Foucault reduction programs
> to print out a mask that will have the proper radii for the attachment
> points-set the mask opening to be VERY wide and VERY narrow.
>
> I'll try to pull the mirror out of the scope this weekend and snap a
> picture of the back of the mirror showing the cell.
>
> Tom
> Tucson, AZ
>
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> 


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