Re: [ATM] mirror grinding

["Bob May" <bobmay@nethere.com>]

BEFORE you start with making another tile tool, grab a piece of iron (like a
3" pipe end cap) and dig the hole that you need in the two mirrors and then
cast the tile tool on one of them.  Try to get an approximately spherical
surface on the two pieces of glass and you won't have to make another tool.
I've broken tools apart after the grinding and polishing were done and have
found that over 3/4 of the tile thickness is still there after the mirror is
done.
You can't do a mirror from the flat with a tile tool unless the curvature is
very gentle.
Bob May
bobmay@nethere.com
http://nav.to/bobmay
http://bobmay.astronomy.net

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