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Article #3398

polishing, when is enough?

#3398
From: John Curtis
Date: Mon, 04 Jan 1993 18:26
28 lines
1308 bytes
Hi.

I'm dragged my 8" mirror out last night (long in the making).
Did about one hour of polishing using cerium oxide on a 
opthalmic polishing lap (polishing pads stuck to the original tool
per a S&T article.)

Things seem to be going well.  The only exception is a small 
scratch (this long: --- ) which I am choosing to ignore.

Total polishing time is just under 4 hours, and the mirror looks
reasonably bright, but not as bright as a wet mirror.

The claim is that this opthalmic lap will polish 2-3 times faster than 
a pitch lap.

When is enough?  Any hints?   I haven't used my Foucault apparatus on
this guy yet.  I did look at the surface at 30x using a Rat Shack
hand microscope and was shocked to see a pebbled surface.  This 
may be underneath the actual top surface of the glass.  The lap 
did start polishing the whole  surface immediately.

Please help me over my novice angst.

Ciao,

jcurtis at sequoia.com
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Path: arc1-ca.pugleaf.net!sparky!uunet!noc.near.net!seqp4!jcurtis
From: jcurtis@seqp4.sequoia.com (John Curtis)
Newsgroups: sci.astro
Subject: polishing, when is enough?
Summary: help
Keywords: ATM, mirror polishing
Message-ID: <1708@seqp4.sequoia.com>
Date: 4 Jan 93 18:26:57 GMT
Distribution: usa
Organization: Sequoia Systems Inc., Marlboro, Mass.
Lines: 30