Re: ATM time estimate for polishing

[Aplanatic@aol.com]

Jim Warner wrote:

> I've just finished my grinding mechine. The table turns about 30rpm and the
>  overarm strokes 24 per minute. Mirror diameter is 4".  How long can I 
expect
>  to have to feed this thing??
>  Have a look at it.  www.teamvid.com/engineer/telescope

Hi Jim,

>From your web page it looks like you are attempting to reconstruct a C14.  
Does it still have an intact corrector plate?  If not you are in for some fun.

The Celestron optics have a spherical primary, a Schmidt corrector plate with 
a "power" of about 84% and a hyperbolic secondary.  If you need a little more 
information on how to make a corrector see:

http://member.aol.com/drowesmi/schmath2.html

Best of luck,
Dave.