From: "Bill T." 
To: atm{at}shore.net
Reply-To: "Bill T." 



>What's so bad about leaving the dental stone unchanneled like this?
>Does it cause edge problems or produce scratches?

I've ground my most recent mirrors with Hydrostone flush with the tile
surface with no problems at all.  I feel confident about going to 5 microns
with these tools. The small amount of dissolved Hydrostone in the slurry
seems to have no grinding affect on the surface.  I've never had a edge
swipe, sleek, or scratch.  I see no reason to bevel or otherwise specially
treat the tile edges.

I like to make the tools so there is at least 6mm of plaster between the
outermost tile and the edge of the tool -- this prevents tile-edge swipes
when lifting the tool.  After the initial coarse grinding I put a mark at a
position where there is a particularly long, flat, flush run of plaster
between the tile and the edge.  When I remove the tool, I tilt it slightly
to pull this "safe" spot off last.

Bill T.



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