RE: [ATM] Tell me about scratches

["Michael Warne" <mwarne@network2000-hi.com>]

Sometimes it's rust, or a piece of calcium sediment in the tap water.
With my 10 inch,  I polished and figured over a period of many months,
and had no problems with scratches.  I didn't take any extraordinary
precautions, although I did keep everything covered with an upside down
bucket when storing.  I always left the mirror on the lap when storing.

Mike.

-----Original Message-----
From: Rich Ball [mailto:ShooterBall@hotmail.com] 
Sent: Monday, November 22, 2004 8:20 AM
To: ATM List
Subject: [ATM] Tell me about scratches


Alas, now three hours into polishing my 8" f4.5 Pyrex mirror I find a
couple scratches.  One is not deep enough to feel with a fingernail.
One is.  It's about 1/4" long.

It's all about pride I suppose. They won't damage the image.  But here's
the problem.  I'd go back to fine grinding and take them out.  I saved
the tool
and made new concrete pitch-lap base.   But how do I protect against
more
scratches?  I have taken what I thought to be reasonable care.

I'd like to hear from some glass pushers who manage to get through
polishing and figuring without these annoying and pride-damping
intrusions.  What do you do to guard against them?  Is it possible to
avoid them without access to an industrial clean room?

Rich Ball
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