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

[Ric Rokosz <radicell2@yahoo.com>]

--- 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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