Re: [ATM] The 15.5 inch Ultrathin, pro approach

[Colton Noble <clnoble@email.arizona.edu>]

Hello all,

Lot's of talk about ultra thin mirrors!  I have seen some ultra thin 
mirrors fabricated by first fabricating the mirror into a full thickness 
piece of glass.  After the correct figure is in the mirror, the back is 
generated down until the desired thickness of the mirror is reached.  
One example is the NGST demonstrator mirror.  It started it's life as a 
fullsize piece of zerodur, and ended up being about 2 (mm) thick.  Check 
it out for yourself....    http://unisci.com/stories/20014/1008013.htm 
Just my two cents worth.


Colton Noble
Tucson, Arizona



Ric Rokosz wrote:

>--- Vladimir Galogaza <vladimir.galogaza@zg.htnet.hr>
>wrote:
>
>  
>
>>As far as I remember they made ultra thin very big
>>mirror
>>by gluing glass to granite support to prevent
>>deformations during grinding and polishing.
>>    
>>
>
>The end mirror was 2 meter by 2mm thick.They did grind
>a base for the glass,then used pitch to secure the
>slumped blank onto it.This slumped piece was ground
>down to 2mm.To release the pitched glass from the base
>they made a huge holding tank filled with oil that was
>heated till the glass -which had "floats" attached to
>it -lifted from the base.
>
>The glass,in use,is supported by one heck of a complex
>wiffle tree/accuator system.
>
>  
>
>>But Mirror Lab is out of this world class operation
>>and atms can only salivate while watching.
>>    
>>
>
>Learn,learn again - they have the time and money.
>
>  
>
>>Making ultra thin with novel techniques  atm
>>imagination 
>>and on atm budget will be real something.
>>    
>>
>
>Minor miracle aswell....:)!
>
>Ric
>
>
>
>		
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