[ATM] RE: Second Thoughts on Mirror Support

[tkrajci at san.osd.mil (Tom Krajci)]

>From: "Steve Houlihan" <sho@surfnetUSA.com>

>...It seems to me that this design will put large bending
>forces into the mirror at each of the three support trees.  I have made
a
>sketch (exagerated a great deal, of course) of what I think may happen
to
>the mirror when the scope approaches the horizontal position if I glue
the
>mirror to my cell.  Scroll down past the pictures of the cell to see
the
>sketch.

>http://www.surfnetusa.com/sho/Astronomy/Telescope.html

How hard would it be to re-work the mirror cell so that the pivots are
closer to the mirror?  From what I can figure out...the closer the
pivots to the mirror's back, the better...if you are going to RTV the
cell to the mirror, and not use an edge support.

If you use an edge support, then I recommend you not RTV the mirror to
the cell.

No matter what route you choose I recommend you do the best you can to
avoid stiction in all moving components...pivots, edge support, etc.

I hope this helps.

Tom Krajci
Tashkent, Uzbekistan


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.512 / Virus Database: 309 - Release Date: 8/19/2003