Re: ATM mirror grinding mechanics ...?

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

Where you wear is where you wear the glass away.  The two disks are
seperated by the grit so they aren't in contact with each other.  This means
that when you press down on an area, the grit in that area will cause pits
more than in other areas where the grit may cause the glass to rise rather
than shatter.  If you don't allow one of the surfaces to become tilted with
relationship with the other, you can't cause any increase of breakage.  It
doesn't matter how much you grind on an edge, the rest of the surface will
stay the same as long as you get some grinding access to it with the tool.
The principal of many curve generators is that the tool is at an angle and
that cuts out the unnecessary glass as the tool is lowered onto the glass.
It doesn't matter whether the tool is a diamond impregnated tool or a metal
ring with loose grit, the results are the same.  Thimk about the various
conditions and you will see.
Bob May
http://nav.to/bobmay
bobmay@nethere.com