Re: [ATM] Turned edge - back to fine grinding?

[Jim Burrows <burrjaw@earthlink.net>]

At 2004-06-23 22:20 -0700, Jonathan Bishop wrote:

>I am figuring an 8" F5 pyrex mirror, and I am afraid I have greated a very
>narrow (1/8 to 1/4") but severe turned edge on it. Tried several techniques
>to get rid of the turned edge, but after a few hours at it it has not
>improved.

In A.T.M. 3, p. 52, it says, "The kind of turned edge we wish to avoid at 
all cost, because of the virtual impossibility of eliminating it once it is 
present, is that which is very narrow, yet so severe that it can be seen by 
casual inspection without applying any means of testing."

Been there, got that.  If it's only 1/8", forget the ego, make the choice 
between blacking it out and reentering the long, dark tunnel of grind, 
polish, figure.

         -- Jim Burrows
         -- mailto://burrjaw@earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84)  

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