From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


I'd take one side, usually the concave side and start grinding. If you
don't feel you have enough dental stone, get some fine sand and you can put
about 20% by weight into that dental stone if needed but the stone will be
a bit weaker and less resistant to shattering.  It would be better that you
find some more dental stone and make a thicker tool. Thanks for the
commnets on using the method at my website.  Just remember that you are
done with the iron cap when you are about 80% of the depth and
approximately spherical in shape.
Dental stone/tile tools can start being used as soon as 1/2 hour after they are cast.
Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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