Re: [ATM] Ultra-Thin Edge Support Idea -RE:[atm_free]ULTRA-THIN30"mirror from Hong Kong

["A. Suijkerbuijk" <a.suykerbuyk@wxs.nl>]

Hi Cord,

Astatic mirror cells can also be calculated by PLOP, you have to state te 
relative forces of the support-rings.

Regards,
Adrie
----- Original Message ----- 
From: "Cord Scholz" <cord@astro-image.com>
To: "'Peter'" <peter@kitgear.com>; <atm@atmlist.net>
Sent: Saturday, January 28, 2006 4:07 PM
Subject: Re: [ATM] Ultra-Thin Edge Support Idea - 
RE:[atm_free]ULTRA-THIN30"mirror from Hong Kong


> Peter,
> the astatic cell is probably the best way to support the mirror but it's
> also the most complicated to design and fabricate. What we need is a tool
> similar to Plop which allows us to calculate astatic cells.
> Here is a nice picture of an astatic cell for a 47" mirror:
> http://www.aip.de/groups/activity/gallery/stella2factory/Stella2Spiegelzelle
> _011?full=1
> I'd build one for the equatorially mounted 24" I'm working on but I have 
> no
> clue how to calculate such a beast.
>
> For conical mirrors of moderate size the central support is very 
> promising.
> Many Cassegrains and RCs use this method, I don't see any reason why it
> shouldn't work for a Newt.
>
> Cord
>
>
>
> -----Original Message-----
> From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf 
> Of
> Peter
> Sent: Saturday, January 28, 2006 3:17 PM
> To: atm@atmlist.net
> Subject: Re: [ATM] Ultra-Thin Edge Support Idea - RE:
> [atm_free]ULTRA-THIN30"mirror from Hong Kong
>
> Hi,
>
> Lots of good discussion here! Thanks for that.
>
> We have a great number of really smart and experienced people on this list
> so let's break the paradigm that thick mirrors are they only way to go and
> come up with a way to adequately support ultra thin mirrors? Observatory
> mirrors have thickness ratios which are radical in comparison to the 30:1
> just discussed. Surely with all of the potential on this board we can come
> up with a means to support large thin mirrors to an accuracy of 1/4
> wavefront.
>
> - should be abandon lateral edge support and go with silicone attachment 
> of
> the mirror to the cell?
> - should we centrally support the mirror from the rear just like conicals 
> by
> gluing a rear support?
> - should we use astatic cells?
> - for super thin mirrors maybe we could built defection controls into the
> mirror support to improve image quality?
>
> I think it would be really cool if we as a group could identify the best
> approaches, perform experimental design on these ideas and examine the
> factors affecting success.
>
> The outcome of this work could set a new standard for amateur telescope
> making. This could be ground breaking work!
>
>
> Peter
>
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