From: James P Crombie 
To: Frank Q , Atm List 
Reply-To: James P Crombie 


The .006" was with the 3.5" spherometer, if you calculate it out
it translate to about .048" across the 8" of the mirror.  So I
have another .002" to go for an f8

Frank Q wrote:

>Hi All
>
>An excellent effort.
>
>I have a question -- My recollections of grinding an 8" f/5 is that
>I could excavate much more than 0.006" in a few hours - does
>anybody else find this or is my memory rapidly failing?
>
>(I used 80 grit and a full sized plate glass tool)
>
>Cheers
>Frank Q
>
>----- Original Message -----
>From: "James P Crombie" 
>To: "Atm List" 
>Sent: Wednesday, July 23, 2003 3:38 PM
>Subject: ATM Mirror Grinder pictures
>
>
>
>
>>Hello all
>>I did another couple of hours with the mirror grinding machine and got
>>the sagita to .006"(this is with a 3.5" spherometer not
overall ) or a
>>ROC of  166" .   I thought I would start with something easy
like an 8"/f8
>>
>>http://www.jamescrombie.com/temp/closeupmirror1.jpg
>>http://www.jamescrombie.com/temp/wideview1.jpg
>>http://www.jamescrombie.com/temp/mirrorgrinder1.avi    (note 1.7mg)
>>http://www.jamescrombie.com/temp/mirrorgrinder2.gif     (same as above
>>but will open in browser window)
>>
>>--
>>--------------------------------------------------------------------------
>>
>>James P Crombie
>>
>>Summerside      Machinist
>>Prince Edward Island      Amateur Astronomer
>>Canada      3D Designer
>>
>>E-mail      jpcrombie{at}pei.eastlink.ca
>>Astronomy webpage      http://www.jamescrombie.com
>>Rhinoceros 3D webpage      http://www.jamescrombie.com/rhino/
>>Mirror Grinder page          http://www.jamescrombie.com/pics/
>>--------------------------------------------------------------------------
>>
>>
>>
>>
>
>
>
>

--
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James P Crombie

Summerside                   Machinist
Prince Edward Island         Amateur Astronomer
Canada                       3D Designer

E-mail                       jpcrombie{at}pei.eastlink.ca
Astronomy webpage            http://www.jamescrombie.com
Rhinoceros 3D webpage        http://www.jamescrombie.com/rhino/
Mirror Grinder page          http://www.jamescrombie.com/pics/
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