Re: [ATM] Figuring with helpof interferometry

[Dale Eason <atmpob@yahoo.com>]

I think the other amazing thing is that about 2 waves
of astig was removed in 2 polishing sessions on the
fast 25 inch BVC mirror.  The first sessions actualy
doubled the error due to a technical math
misunderstanding.  The second removed most of all of
it based on the wear predictions derived from the
first session.

John reasoned that if the error doubled on the first
session then he should do the correction twice as long
as on the first.  The wear prediction spreadsheet he
used from James Mulherien told him where to work the
mirror based on the zernike output from the
interferometry analysis of OpenFringe.  The strokes
were manual on a machine turntable but done using an
arm to control the position of the lap. 

Dale

--- Stephen Koehler <s.c.koehler@gmail.com> wrote:

> Richard,
> 
> >  Sorry Vlad, but there's nothing new in that. Glad
> to see another
> >  amateur is going that way though. It's exactly
> what my (almost
> >  finished..) computerised polishing system does
> and what some of the
> >  big mirror labs have been doing for years.
> 
> What I think is interesting about this is that John,
> with no
> mathematical or programming expertise, was able to
> accomplish this
> using a home-built interferometer, free analysis
> software, free Excel
> spreadsheet to direct the machine figuring, and some
> outside help to
> put the pieces together.  This should be able to be
> repeated by other
> amateurs, given good enough instructions.
> 
> -- 
> Steve Koehler
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 



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