From: "Frank Ward" 
To: "Scott Berfield" 
Cc: 
Reply-To: "Frank Ward" 



Scott, you asked
>what is the best stroke to use to minimize
change to the figure?<

If I did not want to change the figure by polishing the existing surface
with black rouge I would wave my hands over the mirror and tool as they sat
on the disk, other than that you are going to have to obey the laws of
physics. Polishing is the "result" of changing the surface. I
don't know the diameter of your project and how hard it was for you to get
to where you are....but I often go hyperbolic or ellipsoidal on purpose and
from there to parabolic. You can too, and end up with a fine polish, fine
edge, and good figures in the teens. The best way to start is to go in one
direction with the mirror on top and then repeat with the mirror on the
bottom. Don't go too far in either direction and you will come close to
where you are.

Until they come up with something better, the surface we make in a glass
substrate will last for well over a hundred years, giving excitement and
pleasure to many people after we are finished. I think it's worth the time
to achieve the best surface possible. The surface I just
"finished" although not star tested yet, once had aluminum on it.
I just couldn't stand the quality of the view, around 1/4 wave with a
turned edge, so I began again.

My needs and desires and rewards are going to be different from yours, but
in my case returning to a sphere on a 12" takes less than three hours
work and re parabolizing from there takes three hours more. I think it
would be worth it to improve the surface polish by 50%.

Frank Ward
Atlanta, GA (still overcast and wet)


-----Original Message-----
From: owner-atm{at}shore.net [mailto:owner-atm{at}shore.net]On Behalf Of Scott
Berfield
Sent: Thursday, August 21, 2003 1:36 AM To: ATM{at}Shore.net
Subject: RE: ATM some questions/ideas



 Assuming yow are very close to final figure and want to give a last
smoothing pass with rouge, what is the best stroke to use to minimize
change to the figure?

-----Original Message-----
From: owner-atm{at}shore.net [mailto:owner-atm{at}shore.net] On Behalf Of
Russell Jocoy
Sent: Wednesday, August 20, 2003 8:57 PM To: bcjawsss24{at}verizon.net;
thewards{at}mindspring.com
Cc: ATM{at}Shore.net
Subject: RE: ATM some questions/ideas


>From: "Arthur" 
>To: , 
>CC: 
>Subject: RE: ATM some questions/ideas
>Date: Wed, 20 Aug 2003 17:27:19 -0400 (Eastern Daylight Time)
>
>Hi Frank,
>
>I been following your posts about micro facetting and like the methods
>you described. I think I will use them when get to that point with my
>mirror. I m curious, where can I purchase red or even black rouge?
>
>
>Arthur
>
("atm{at}shore.net")

   Arthur,    You can buy Red Rouge from Willmann-Bell. Although they do
not
list mirror grinding
or polishing products on their website you can call them at their toll free
number and get a catalouge that lists all kinds of stuff. I bought more red
rouge than I can use for about $15.00.
         Russ Jocoy
("atm{at}shore.net")

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