Re: [ATM] repeatable mounting of thin mirror

["Vladimir Galogaza" <vladimir.galogaza@zg.htnet.hr>]

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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