Re: [ATM] Figuring question

[Jim Burrows <burrjaw@earthlink.net>]

At 2006-05-30 12:35 -0500, Mike Lockwood wrote:

>lance clarke wrote:
> > I'm at a bit of a loss how to proceed.  Figure XP tells me I have a low 
> zone
> > 1.5" from the edge, and the edge is also high compared the the rest of the
> > mirror. I've tried MOT w strokes, coc strokes, long and medium long (and
> > even short just to see what would happen), and TOT short strokes to bring
> > down the outside...always seems to give roughly the same result.  Is there
> > something I'm missing?  Should I blame the lap?
> > The mirror is a 12.5" F5.  I can post my test numbers if it helps.
>
>Yes, the test numbers (ROC, mask radii, zonal readings, moving- or
>fixed-source tester) would probably help.  Now for the standard questions:

I agree with Mike - test data would help.  One thing that the test data 
would tell the experts on this list that Mike didn't mention is how low is 
the low zone and how high is the edge.  It could be that all the different 
strokes and spell lengths might have cancelled each other out or just 
weren't enough if the deviations are really large.  In general, it's better 
to guess what specific action might work, do it for a measured length of 
time, test again and see if that spell did the job.  All the old pros kept 
a notebook with such data (spell's stroke and time, test readings and 
result) for progress and saved for the next mirror.

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

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