Re: [ATM] figuring 10 inch mirror

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

A rolled edge, as opposed to a real turned edge would tend to make that kind
of a result where things hardly budge in the error dept.  The truely turned
edge is more of a sudden change in the ROC and most, when looking at the
error, tend to ignore the actual turned edge and look at the area just
inside of it, mixing in a little of the TDE.
If he truely has a rolled edge then yes, the end result will hardly change
as the edge is still putting it's light into the area of the disk.
FWIW, I've seen TDE that was a good inch longer than the center of the
mirror and only 1/8" wide.  I made the guy work all of that off before he
started parabolizing.
Bob May
bobmay@nethere.com
http://nav.to/bobmay
http://bobmay.astronomy.net

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