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Re: [ATM] Newbie needs help getting to sphere...

Your tool may be too soft.  The only time I had problems reaching my sag
was because of that.

Ken Lowther

Graham McGuire wrote:

>I have been grinding with 80 SIC and 1/3 MOT to try to get t sphere... but 
>after twenty hours there is
>
>still a hole and I am 6" long on my FL. I started with a chordal and as 
>Richard Berrys book suggested and
>
>carried on with above after I reached 60"... after ten hours the sag of my 
>6" mirror is .041 (close to the
>
>.047 req'd for the f/8, 48" I am aiming for). Help! its driving me insane 
>that I still have a .75 " ledge
>
>around the mirror.
>
>Cheers,
>
>~Graham McGuire esq.~
>
>
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>  
>

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