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


If you want a full hemisphere, the best way is to mold the glass first and
then fine grind from there.  Not being able to mold means that you need to
do a diamond cup grinder and make the general surface shape and go from
there.
The polisher would be best started with a set of polishing pads and finish
up with a pitch polisher at the end.  I'd probably not go past about 30deg.
for the polisher size on the hemisphere. Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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