Re: [ATM] Grinding questions

[George Anderson <georgea@cam.org>]

The corrector plate is matched to the radius of curvature (and errors in
the surface) of the primary mirror as well as the spacing between the
primary and the corrector (not quite as critical).
Measure the difference in edge thickness between the two and correct for
that difference when you build your primary mirror cell.

George Anderson
Montreal Canada

Clear skies and good health

John Stephen wrote:
> 
> Would a difference in thickness affect the operation of the corrector plate
> (due to a change in distance) or would it be more of a problem for the
> travel of the focuser?  If I decide to ditch the plate glass and switch to
> Pyrex then perhaps I can find a good thickness match (the existing mirror is
> Pyrex).  My alternative is to just re-work the original mirror instead, but
> I'm afraid of screwing it up and not having a working scope anymore, so I've
> have been avoiding that option.
> 
> Thanks,
> - John
> ----- Original Message -----
> From: "Bill" <astronutski@yahoo.com>
> To: "ATM List" <atm@atmlist.net>
> Sent: Wednesday, October 06, 2004 6:58 AM
> Subject: Re: [ATM] Grinding questions
> 
> > One thing I would add as far as the focal length is concerned is
> > don't forget to factor in the mirror thickness compared to the
> > original.  I don't know what's in there but would assume it's thicker
> > than 3/4".
> > -Bill
> 
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