Re: [ATM] Report from a professional optical shop near Baltimore

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

Dominic, remember taht pad materials don't change their ROC like
pitch does.  Putting pads right on an iron tool will insure that
the ROC of the surface is going to stay exactly where it is.
With pitch, I'd edpect that from the forces involved, the pitch
will indeed thin out at the edges as you are putting q lot of
force on thoes edges as you polish by hand.  I'd expect machine
polishing to be less abusive in this regard but you may still
have the problem if the pivot pin is any distance from the pitch
surface (the ball of the pin should be as close to the mirror
surface as is easily possible) as the push forces will cause the
edges to preferentially roll over and rid away from the edge of
the mirror.
Bob May
bobmay at nethere.com
http: slash /nav.to slash bobmay
http: slash /bobmay dot astronomy.net
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