From: "Jeff Baldwin" 
To: "Thomas Janstrom" ,
        "atm" 
Reply-To: "Jeff Baldwin" 


If r is the radius of the mirror (half the diameter) and R is the radius of
curvature of the center zone ( twice the focal length), then the sagittal
volume, or the amount of material removed during the mirror making process
if no waist occurs, is pi*r^4/(4R).  I have a Word document proof if
interested.
JB


Jeff Baldwin
Stockton  CA
W121d20.96m N38d01.62m
bald{at}gotnet.net
http://bald.gotnet.net/
----- Original Message -----
From: "Thomas Janstrom" 
To: "atm" 
Sent: Saturday, January 18, 2003 5:21 AM Subject: ATM calculating the volumes


>
> How do I calculate the volume of a circular section of a sphere? Sort of
> like what we grind out when hogging. What I want to do is work out how big
a
> blank I can get from brick of C1 glass (see corning optical glass thread
for
> details) I'm planning on casting one of the curves into the blank so I
want
> to work out the volume of the, at this point convex side.
>
> Anyway thoughts and more importantly the formula to do this would be
great.
>
> TIA.
>
> Clear skies, Thomas
> http://www.tjanstrom.com
> "Don't make me set the laser printer to stun"
>
>
>

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