Re: [ATM] Moulded Mirror comment by ANY telescope maker

["Bill Kelley" <flex@commspeed.net>]

Peter Chen's mirrors are made of carbon fiber composite and epoxy optical 
surface.
Bill

----- Original Message ----- 
From: "Guy Brandenburg" <gfbrandenburg@yahoo.com>
To: "Jerry Dove" <jldove1@cableone.net>; "Jean-Guy Moreau" 
<jgmoreau@cablevision.qc.ca>
Cc: <atm@atmlist.net>; "Russell Jocoy" <russjocoy@hotmail.com>
Sent: Friday, February 10, 2006 3:58 AM
Subject: Re: [ATM] Moulded Mirror comment by ANY telescope maker


> Peter Chen's mirrors were not made of glass, but fiberglass and resin. 
> The mandrel (form) was glass, IIRC. It was all quite tricky; even  getting 
> the release agent right took months of experimentation, he told  me. But 
> the effort was more or less successful, I think...
>
>   I'm not quite sure where his efforts are going right now.
>  Guy
>
> Jerry Dove <jldove1@cableone.net> wrote:  On Thu, 9 Feb 2006 
> 20:48:15 -0500, you wrote:
>
> I seem to remember a fellow by the name of Peter Chen ( at NASA) that was 
> working on some type of molded mirror.
> I also remember some pics he posted with his daughter holding up a VERY 
> thin ( maybe 3/8" ) by about 24" finished
> product and he claimed to be working on replicating it from a mold.
>
> Just food for thought.
>
> Jerry Dove
> Kuna, ID.
>
>>Sent: Thursday, February 09, 2006 7:39 PM
>>Subject: [ATM] Moulded Mirror comment by ANY telescope maker
>>
>>
>>>
>>>    To all,    The "moulded mirror" comment in any advertisment or 
>>> listing
>>> from any telescope maker is just mumbo jumbo saying that this glass disk 
>>> was
>>> not pregenerated from a machine.. This glass disk was moulded with the
>>> determined "f" curve onto the blank. Of course we all know how accurate 
>>> this
>>> curve needs to be..., well beyond any mould known to man.  I don"t care 
>>> if
>>> you mould it, generate it, sit on it, you will still have to grind it,
>>> polish it, and figure the surface. It is totally ridiculous to think 
>>> that
>>> any mould could come close to a surface that could reflect a wave length 
>>> of
>>> light close to what is needed to focus to your eye with any definition..
>>> Russ Jocoy
>
>
>
> Guy  Brandenburg
> Washington, DC
> My home page:
> http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
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>
> 


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