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

[Guy Brandenburg <gfbrandenburg@yahoo.com>]

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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