Re: [ATM] Maksutov Corrector Cell Design

[Ken Hunter <atm_ken_hunter@yahoo.com>]

Hmmm... Is it necessary to aligh a SPHERE?

I don't think so.

Ken Hunter

--- Dominic-Luc Webb <dlwebb@canit.se> wrote:

> 
> > I am designing the mechanical components for a
> Maksutov telescope in
> > particular I am working on the corrector cell.
> >
> > I am using Fillmore's booklet "Construction of a
> Maksutov Telescope" as
> > my primary reference; page 11 (Figure 15) he show
> a machined aluminum
> > cell. It appears based on the his diagram and text
> that the R2 surface
> > of the corrector rests directly on the aluminum
> cell.
> >
> > Is it safe to have a corrector resting directly on
> the aluminum? Is it
> > safer to have the cell rest on a "protective"
> gasket?
> 
> 
> Less trivial than some might think. As I am learning
> first hand
> with my homemade 12", the tolerances for these
> animals are rigid.
> I will definitely not have a direct aluminum glass
> contact on my
> corrector. I was planning on a mylar gasket or some
> such.
> 
> Regarding collimation, I found myself spending
> fantastic amounts of
> time trying to align all the optics and gave this up
> in favor of a
> fixed corrector. If it *REALLY* gets out of
> alignment, I will likely
> just add a mylar strip (or two) to correct it. I
> suppose you could
> have the ring for the corrector supported by a few
> threaded rods and use
> nuts to tilt the corrector as needed. If you go this
> route, you may wish
> to consider a fine thread, because your goal is
> precision alignment.
> >From the start you should be very close to perfect
> alignment and be
> adjusting within something like a degree or two of
> arc, not more.
> 
> Then again, you could end up spending a lot of time
> hassling over which
> surface is tilted relative which other surface, and
> like me, decide to
> fix the corrector permanently to remove one
> variable.
> 
> Dominic-Luc Webb
> 
> 
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> 



		
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