From: "Russell Jocoy" 
To: bader{at}hydroblendinc.com, atm-digest{at}shore.net
Reply-To: "Russell Jocoy" 






>From: Byron Ader 
>Reply-To: Byron Ader 
>To: atm-digest{at}shore.net
>Subject: ATM Newbie with a 6" blank
>Date: Tue, 11 Mar 2003 08:30:50 -0700
>
>I have a simple question.  I spent last night rough grinding my 6" plate
>mirror to a target saggitta of 1.905mm thus an F/5 mirror. I am short of
>that goal at 1.702mm and the curve appears to be pretty close to the
>edge if not right there.  I have been reading a couple of sources and am
>curious if I should use a w stroke or a normal stroke to bring the curve
>down to my target and to conform the tool and mirror?  Bell's book
>describes using a w stroke and then using the normal stroke.  Another
>source indicates I should just use a normal stroke right after the
>chordal stroke.  Anyone have some advice?
>
>Nice to meet you all, TIA
>Byron Ader
>
>Cell Phone - (208) 550-0225
>Work Phone - (208) 467-7441 Ext. 223
>                      (208) 549-3494
>Email - bader{at}hydroblendinc.com 
>            byrona{at}hydroblendinc.com 
>
>
>
>
("atm{at}shore.net")


   Byron,  Go to the "W" stroke and get used to it. If you are
close to your
target F number, dig in and
grind. If you are out to the edge on shovel strokes, It is a possibility
that you are pushing too much
on the edges of your glass. If your center is close, within a piece of
paper or a thick hair, go for the
"W" stroke with the barrel dance. This will form your tool to the
curve. If the center is not deep enough,
Concentrate on the center , not the edges.  Don't get too deep. Your
process of going through the
different size grits will make your curve and deepen your curve.  I am sure
Bob or Mel will tell
you more experienced information, but  Don't push to hard on the edge!!!!
                                      Russ Jocoy
("atm{at}shore.net")

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