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Article #3398polishing, when is enough?
From: John Curtis
Date: Mon, 04 Jan 1993 18:26
Date: Mon, 04 Jan 1993 18:26
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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