Re: [ATM] repeatable mounting of thin mirror

[Jarvis Krumbein <jkoptic@juno.com>]

Vladimir, if you have an edge thickness that is even all around and you
also have a good spherical surface on the concave side (easiest to
measure), then you truly do not have a wedge problem.  It's true that
wedge will not adversly affect a conventional mirror (flat blank) and it
is also true that wedge is critically important for a mirror that is to
be "flexed".  These are two completely different situations.

Jarvis Krumbein

On Tue, 15 Jun 2004 21:31:57 +0200 "Vladimir Galogaza"
<vladimir.galogaza@zg.htnet.hr> writes:
> 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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> ATM mailing list http://www.atmlist.net/
> 


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