Re: [ATM] trepanning

[Ken Hunter <atm_ken_hunter@yahoo.com>]

Hey Jerry...

Before you send that secondary off to be coated, do
you have a small spherical mirror? If you do, you can
set up to test the sphere with a Focault test then put
the secondary in the path and test again (after
turning the mirror 90*... should still look like a
sphere if the secondary doesn't change the wavefront.

You can ecen use the central portion of an aluminized
parabolic mirror for the test if you don't have a
small sphere available. What you see without the
secondary should be the same thing you see with the
secondary flat in the path.

Ken Hunter


--- "Jerry B. Hillman" <JBHillman@ev1.net> wrote:
> Hi Jeff,
> I did, It chipped on the front.  Big chips.  Very
> minor chips on the back.
> .125" on the front. .015" on the back.
> Jerry
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/



	
		
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