From: "Richard F.L.R. Snashall" 
To: ATM ,  atm_free{at}yahoogroups.com
Reply-To: "Richard F.L.R. Snashall" 


I realize I'm stepping outside the lines here, so I should probably expect
some flaming; but here goes.  Being a beginner here, I needed more feedback
on fine grinding so I tried an experiment.

I used a SiC wheel on a Dremel to grind channels on my [Pyrex] tool on 15
mm centers.  I have stepped down in abrasive, using 3, 1, and 0.3 micron
alumina.  The lens surface is convex, so I then used a
"mini-maglite", holding it next to my head to examine the tool
instead.

The problem is that the surface looks ugly.  In the middle, there is a
section that is gray, even though I am able to mostly fill the tool with a
reflection. Mostly, though, this grayness seems to fall near the channels.

Am I just being impatient?  Should I give it a few more wets to see if the
grayness goes away?  Should I expect that the lens surface is just as bad
as the tool?

                Rick S.

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