Re: [ATM] ATM: "Fortune favors the bold"

["Thomas Janstrom" <thomas@moiler.com>]

I've done this when figuring Cass secondaries where I needed to move a lot
of glass (at least in the context of figuring) quickly. I made a
sub-diameter pitch lap which I charged with 5micro AlOx. Once pressed and
broken in it works very fast and leaves a surface that you can do
interference testing on with out further polishing.

Cheers, Thomas.

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
David Harbour
Sent: Tuesday, 25 March 2008 10:37 PM
To: Guy Brandenburg; atm@atmlist.net
Subject: [ATM] ATM: "Fortune favors the bold"


To Guy, all:

Guy quoted an item in the catalogue:

The catalog description is as follows:
"Made of flexible foam, these pads are specifically engineered for
precision polishing of lenses, mirrors, and other glass and ceramic
surfaces. They're impregnated with cerium oxide for quick polishing.
Grain size is approx. 1 micron (0.001 mm). Pads are 0.050" thick and
have an adhesive backing. Color is brown."

Okay, if they are about one micron in diameter, why not try 2 micron 
aluminum oxide directly on the pitch? I have read where one can pre-polish 
on pitch with small abrasive, very fast. I have never tried it; I was 
tempted, but somehow never got around it. Why don't we find a less 
problematical way to cut down on fine polishing time than pads? Anyone game 
to try this proposal? I have a distinct memory of reading this by an 
authority in a BOOK on mirror making.

R-101 


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