FW: ATM Thermal effects and a question

[bprewitt <bprewitt@neo.lrun.com>]

--- On Fri, 26 Sep 1997 07:57:34 -0400  G Hooper <sixppc@unix.asb.com> wrote:
 <snip>
>What happens is the material is altered at the molecular level and relieves
>98% to 99% of all internal stress. It works.
>
>    Has any one stress relieved  primarys?  What do you all think?
>
That's an interesting idea....
A guy I know has his dies for forging aircraft bolt heads cryogenically
treated. They last twice as long. It costs several hundred dollars, though.
And of course, this is tool steel, not glass.

For glass, I assume we're talking about treating a mirror blank before it is 
ground and figured, not after. 


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Bill Prewitt
Web page of CCD imaging, Telescope making, Fractal graphics, and Caving:
http://home.neo.lrun.com/imaging 
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