Re: [ATM] Refiguring cass mirror to newt

[Jim Burrows <burrjaw@earthlink.net>]

At 2007-07-29 16:44 -0500, Gord Tulloch wrote:

>I understand
>when people polish and figure perforated mirrors they keep the core and
>stick it in the hole with pitch. Any guidance on what I might do with this
>mirror where we don't have a core? Don't worry about it, or fill it with
>something else (dental stone?) so it doesn't mess up the lap?

I asked the same question of Bob Goff (RIP) and his answer was, 
"Don't worry about it."  I'd guess you'd want to worry a little - 
when pressing the lap, you don't want to end up with a bulge in the 
middle.  Maybe treat it as a Mel Bartels oversized lap or just make a 
hole in the lap to match the mirror's hole, then you've got a second 
edge - which will probably be in the secondary shadow.

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


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