RE: [ATM] sleeks

["Jerry" <wa4guu@verizon.net>]

If they are sleeks they will polish out in 15 to 30 minutes of the "right
stuff". They most likely come from using to much rouge or what ever agent
you are using. Maybe the contact is not so good. Slowing down can help. You
want the lap to be working, not a slippery slime. If you use too much rouge
and/or stroke too fast the mirror rides up on a thicker film of water and
rouge allowing those larger particles to get between the surfaces. 

Watch those sleeks and make sure you remember the angle of light that shows
them best. Find that right mixture of water and rouge and stroke speed that
gives stead firm resistance. It won't take long to make them disappear when
you are doing it right.

Sleeks are really hard to see unless you have the light just right. Light
from a grazing angle, and if the glass is clear a black background helps. If
they are scratches they will take longer to get out but I would work at
polishing them out until I satisfied myself that it won't go away that way. 

If you didn't have them before the parabolizing work the cause will probably
be what I have suggested. But you may have had them and just now got the
light right to see them. And you wouldn't see them until the glass is well
polished. Sleeks are more likely to occur in parabolizing. You are more
likely to lose close contact then.
 

Jerry


-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
David Grennan
Sent: Tuesday, June 07, 2005 3:04 PM
To: atm@atmlist.net
Subject: [ATM] More Mirror Disasters!

Hi all,

Last evening while working at figuring my 8 inch f6.3 I managed to get
something between the lap and the mirror which resulted in lots of tiny
(almost imperceptable) scratches all over my mirror.  Even though I tried
scrupulously to clean up every single grain from previous operations.  Hence
my first question.  Would you guys tolerate these tiny scratches and just
move on, should I go back to fine grinding, or is there a chance I can
polish these scratches out.




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