Re: [ATM] 48" ritchey cretians

["Khail Rosenberg" <mikhail.rosenberg@rosenbergtelescopes.com>]

A big fan of that web site... cause he did an RC... but he has no contact
info :(

I think that is a very good design for the tilt table.. I shall be using
that idea, or something very similar... if i can limit the amount of times i
lift the glass then i will be much happier..


Cheers!

On 1/19/08, David Weinshenker <daze39@earthlink.net> wrote:
>
> Khail Rosenberg wrote:
> > Hi Bob,
> >
> > I have an ambition to never use machines to make my mirrors, but i think
> > something for this size, i really will have no choice... I think i will
> make
> > a few machines, will help if i want to make something bigger and
> better..
>
> Interesting - as a novice to this whole optical fabrication thing,
> I am not familiar with the details of current practice in design
> and using of machines for working glass, so I may be talking through
> my hat here... but why is it your ambition to never use machines to
> make mirrors? I should think that (in principle at least) it should
> be possible to make a grinding/polishing machine that would give full
> control of the profile of the work and better blending of the surface
> figure than the normal hand methods (even for glass of more modest
> size)...
>
> > Any advice on machines to actually lift and put it on stands? I do
> > understand the concern of dropping the mirror, it will make a lot, a
> looooot
> > of work really out the window...
>
> I've seen pictures of a simple tilt table that was arranged so that
> a 32 inch mirror could be slid off the machine turntable and swung
> to near-vertical for testing. (See this link, about halfway down,)
>
>
> http://bi-staff.beckman.uiuc.edu/~melockwo/telescopes/holmes32/mirror32/mirror32.html
>
> -dave w
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