RE: [ATM] mirror dd amage

["Richard Schwartz" <richas@earthlink.net>]

Keep in mind that if you have enough bevel, the BACK of the mirror acquires
a 45 degree sharp edge, and that must also be beveled.  And when you bevel
off the sharp edge on the back,you have a 45 degree sharp edge on the front
again.   After a few such cycles, you end up with a much smaller conical
mirror blank with zero aperture.

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
gregj888@comcast.net
Sent: Wednesday, June 08, 2005 12:44 PM
To: atm@atmlist.net
Subject: [ATM] mirror damage

The bevel shouldn't be much more course that the surface being ground.
Course stone is fine when course grinding but you need to dress with a fine
stone when lapping.  I use a diamond file, the dress with a medium to fine
stone...
Greg
----------------------------------------------
From: Ken Lowther <hermit@outofoptions.org>


I don't like a course stone because I have had small pieces break off 
during fine grinding and had to back up. 
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