From: "Russell Jocoy" 
To: jpcrombie{at}pei.eastlink.ca, atm{at}shore.net
Reply-To: "Russell Jocoy" 


>From: James P Crombie 
>Reply-To: James P Crombie 
>To: Atm List 
>Subject: ATM Mirror grinder-MOT or TOT
>Date: Sat, 26 Jul 2003 02:23:57 -0300
>
>
>I have progressed to 120 grit and have most of the pits from the 60grit.
>But the Sagitta is slowly getting deeper.  If I switch to TOT will this
>flatten the sagitta out a bit?  I am aiming for .012(on the spherometer)
>and I am currently at .0132".  This will give me a ROC of
116"  instead of
>the 128" I am looking for.
>
>Some new pictures up on the mirror grinder page below
>
>--
>--------------------------------------------------------------------------
>
>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/
>--------------------------------------------------------------------------
>
>
>("atm{at}shore.net")

      Put the tool on top and grind for afew revolutions, check the
progress, Grind for a few revolutions, and check your progress, If the
curve does not come up... Grind for a few revolutions, and check your
progress... Tool on top will bring the center up(In reality, you are
bringing the edge down to compensate for a deep center)..... Russ J.
("atm{at}shore.net")

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