From: J Killea 
To: atm{at}shore.net
Reply-To: J Killea 


After much time and consternation at 120 grit, with a persistent
out-of-contact edge, and Sharpie
tests that just don't seem to improve, I have found that my tool has three
tiles that are just too
high.  It's a relief to find what looks like the key problem.

For a telling visual, I have 3 pics at:
http://publish.attbi.com/wsb-cgi-bin/view.cgi/photos.html?wsbID=206007

Once again, I am looking for advice on the best course to take... My
thoughts include:

1)  Pour a new, full diameter Hydrostone tool fit to the existing blank,
and set new tiles.  This
is my own preference, but please advise on any risks you might know of
here. Would my low edge
perpetuate itself if grinding with a tool that matches the current
non-sphere? 2)  Grind the proud tiles down a bit.  I would probably overdo
the grinding just to make sure they
are out of the way, but then I would have even fewer tiles working on an
already fairly sparsely
populated tool.
3)  Go back to #80 and grind 1/3 COC until everything is in better contact.

Thanks for any guidance!!

*************************

FWIW, the history here is that I wore my tiles down to the nub when I
decided to slightly flatten
and regrind the curve (all with this tool) after finding that it was
already at F5 instead of F6
or higher.  So, I glued new tiles directly on top of the old and went at it
again on the newly
shallowed surface.  I placed the mirror on top of the tool and tiles while
the epoxy cured
overnight, but clearly 3 tiles were not squished down enough.





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