From: Guy Brandenburg 
To:  tkrajci{at}san.osd.mil
CC:  atm{at}shore.net
Reply-To: Guy Brandenburg 


Only one more test:
What are the results when you re-aluminize a mirror that has RTV residue
here and there? Or will acetone get rid of all of it, really and truly? Guy
B

tkrajci{at}san.osd.mil wrote:
>>From: Chuck Dethloff 
>
>
>>One thing that I learned from my friends experience was that having three
>>mirror clips instead of only one (which I have traditionally done because
>>the other two seemed redundant) is what saved Howard's mirror from being
>>possibly broken. The OTA was laying flat on back upside down when I came
>>upon it. The mirror no longer supported in it's sling was rather now
>>supported by the upper bumper and tipped forward against the two mirror
>>retainer eye bolts attached to the lower two bumpers. Without that
>>redundancy his mirror would have undoubtedly fell forward in the box and
>>could have been scratched or possibly broken.
>
>
> Some folks are hard sold on the mirror clips and sling concept.  When will
> they let go of the idea?  When it's pried from their cold, dead
> fingers.  ;-)
>
> My sixteen inch mirror is RTV glued to a six point support.  No slings.
> No clips.
>
> In a manner of speaking it is held in place by six, adhesive, shock
> absorbing, high strength clips.  In my opinion that is far better than
> three mechanical edge clips that let the mirror rattle about, and perhaps
> present a chipping risk during rough transport and handling.
>
> I don't care what orientation my mirror box takes during shipment.  The
> mirror is bonded to the cell and won't fall out.
>
> When I first bonded the mirror to the cell, I tested it in stages.  At
> first I did some gentle tilting of the cell, then more tipping.  No
> problems.  Then I inverted the cell.  Again, no problems.  Then I put some
> weight on the back of the mirror while the cell was inverted.  Once again,
> no problems.  Then I grabbed the cell as if I were an olympic athlete
> preparing for the 'hammer throw'...and whirled the cell/mirror about.
> Still yet again, no problems.  (What other tests would folks like me to
> conduct?...short of damaging or destroying componenets)
>
> My telescope was shipped out to Tashkent...10,000 kilometers and three
> months.  It survived intact, and when I assembled it for the first
> time...collimation was only a little bit off.  Not too shabby.
>
> Can we please put the mirror clips and sling idea to rest?
>
> Tom Krajci
> Tashkent, Uzbekistan
>
>
>
>
>

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