Re: [ATM] ritchey cretians

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

Interesting, blunt attacks Jerry...

I can not say agree with anything you said, but you are welcome to having
your opinion... I have made VERY many mirrors, and worked on the worlds most
advanced laser systems (Not telescopes).

many people here do this as a hobby not profession, my friend... If i could
get assistance with ONE scope great, if not then i have made multiple other
scopes/mirros/ optics that everyone is happy with...

thanks for the criticism, but it really serves no point since its not
constructive in any nature...

Cheers
Mikhail

On 1/20/08, Jerry <wa4guu@verizon.net> wrote:
>
> I would think that you would have all the answers to these many questions
> of
> design, manufacture and testing already if you think you are going to turn
> the optical industry on its head.
>
> If you haven't learned and solved the difficulties of designing, producing
> and testing large sophisticated optics, what makes you think that
> consumers
> are being taken to the cleaners by those presently making such optics? And
> what are you going to do differently that will cause you to win in the
> competitive marketplace?
>
> If anyone on this list knew those answers they would be doing it already
> themselves.
>
> Jerry
>
>
>
>
> -----Original Message-----
> From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf
> Of
> Khail Rosenberg
> Sent: Sunday, January 20, 2008 11:33 AM
> To: Bob May
> Cc: atm@atmlist.net
> Subject: Re: [ATM] ritchey cretians
>
> Rather suprised by that Bob.... no auto collimation?
>
> then what would you recommend? the benefit of collimating is that i plan
> on
> doing it more than one time...
>
> not too sure about the mirror design, i think for the sake of time, i am
> already pouring it and dont really want a cell... anything thats going to
> be
> 48" especially an RC is not going to be too mobile, and to house it, i
> would
> want to spend some money on for the controls.. making a lighter mirror
> will
> take a bunch of time, and also no one at my shop (including myself) has
> made
> this type of mold.... sadly..
>
> let me know your suggestions for testing though...
>
> On 1/19/08, Bob May <rmay@nethere.com> wrote:
> >
> > As is usual, when someting interesting comes along on the list,
> > everybody has a bunch of good ideas.
> > If you're going to be casting glass yourself, you might as well
> > do a cellular mold ala the 200" Hale mirror.  Bob Goff had a 32"
> > mirror blank from the company he had (Hextek) and it was light
> > enough that a single person could pick it up.  Those things
> > weren't cheap tho!  He did a fused proces in making the mirrors.
> > As to handling the glass, the first thing is to make up a good
> > strong band of steel with clips to hold the glass onto the band
> > and not allow it to sli9p.  From there you can do any kind of
> > attchment for lifting and otherwise moving it about.  I will note
> > that having a building with a ceiling high enough that you don't
> > have to tilt the glass off of the table in order to do the
> > testing o at the ROC will be a plus if you don't mind walking on
> > catwalks.  Otherwise, a tilting top for the grinder (you don't
> > need to support the last few inches of the glass on the table!)
> > will make testing easy.  Remember that you're looking at about a
> > half ton of glass for the mirror.
> > As to the flats, don't even try thin glass for them.  They will
> > flex way too much with something that thin.  I won't say that
> > autocollimation is out for a telescope of that size, but I'd
> > rather look at all of the other tests before even contemplating
> > such a test.  Even just finishing the telescope and pointing it
> > at a star for star testing will be easier!
> > Bob May
> > Due to the large volume of SPAM thaat I'm getting, add an open
> > square bracket to the subject line or my spam filter will reject
> > your post~
> > rmay at nethere.com
> > http: slash /nav.to slash bobmay
> > http: slash /bobmay dot astronomy.net
> > Replace the obvious words with the proper character.
> >
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