Re: [ATM] Turned Down Edge

["Rich Ball" <ShooterBall@hotmail.com>]

> > This IMHO is why TDE is such a big bugaboo. TUE is easy to fix. You put
the
> > lap on it and it comes down. TDE will not come down if you avoid the
edge.

> One can see this demonstrated in mirror making classes very nicely.  The
> mirrors with edges that lag in polishing almost always have a rolled edge.

> Mel Bartels

Please explain this to me.  It seems counter-intuitive.  My notion would be
that if the edge were not worked (ground or polished or figured) it would be
rolled up, not down. ???  How does avoiding the edge to anything at all to
it?
I'd have thought that to get rid of a TDE you'd work the whole surface of
the mirror except the edge, leaving the edge higher and eventually within
the proper figure.

Rich Ball
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