ATM Persistent Turned Edge

[Anthony Stillman <atmer@flash.net>]

This is a little embarrassing, but it's fixed now so I'll share.

I've been struggling with a turned down edge for a while now.  The glass is
small, so after wasting too much time trying to remove it with rouge, I
returned to cerium.  I'd been figuring when it turned.  A couple hours
roughing it, left a nice sphere and about 2 mm of really nasty edge.  I
relented, pretended to accept my fate, made a new lap for black rouge, and
quantitated just how ever loving slow that stuff is.

With the figure going no where and some free time before leaving for the
mirror lab, I stripped the lap and ground out that effing edge with 9
micron.  I was heating pitch as I worked.  Six wets at 9 and four at 5 and
3, I poured, hot pressed, and headed out the door a half hour late.  We
were a little light on helpers last night.  This cut into glass removal.
But just now, I finished polishing out.  As I wrote, it's fixed.

So, how'd I turned it.  When I pressed for figuring, the pitched spread,
just a little bit, past the edge of the mirror.  Some of it chipped off
when I separated the glass and lap, but there was more.  So what do you do
when this happens?  Well duh, you take a razor to the lip and remove it.
All of it.  Yea, duh.  Anyway, while polishing off the lap's lip, I turned
the edge, badly.  Really badly.

What's the moral to this little story?  Do as I say, not as I do.  Which
goes for me too.

Anthony


Sum quid sum