RE: [ATM] repeatable mounting of thin mirror

["Peter" <peter@kitgear.com>]

Vladimir,

You and I have something in common. Check out my 16" f5.25 flex mirror
project and how I measured wedge to less than 0.001". I'm slowly working on
this project...

Just like you I'm making a spherical back mirror.

www.kitgear.com/atm

Peter

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net]On Behalf
Of Vladimir Galogaza
Sent: Tuesday, June 15, 2004 3:32 PM
To: atm list
Subject: Re: [ATM] repeatable mounting of thin mirror


Mel,

>It's trivial to remove wedge to 0.001 inch when doing so.

I am working on spherical back mirror 189mm dia, 10mm thin sphere for
flexing a la Alan Adler. Wedge is an important issue and Alan Flex program
calculates wedge tolerance. I have trouble to measure wedge reliably to that
tolerance because I am not sure which circular edge, front or back or both
deviate. By measuring edge thickness, theoretically I can have zero wedge,
that is equal thickness all around but it is possible that both edges go up
and
down simultaneously, though this is not very likely and I never observed
this
kind of situation
instead edge thickness varies more or less. From this measurement alone
I can not deduce actual wedge. I should have some  plane reference surface
to
measure from it but this I did not manage to do to required accuracy.
Was this problem addressed already by somebody.

Vladimir.






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