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

["David Harbour" <stainless_steel@suddenlink.net>]

It is odd, Bob, how different people have different experiences with pads. I 
tried to polish a sixteen inch blank, already pre-polished; this was when 
the practice was new. The customer supplied the pads, the ones that were 
recommended in the original artuicle in S +T magazine article about same; 
this was when I had my well equipped optical shop with my wonderful, huge 
precision optical bench.

After hours of pushing, and recharging, and pushing, and recharging- I could 
see no increase in the polish. I was probably neglecting something; but 
there were no other atms in town to tell me what I might have been doing 
that was stupid (people here in "Needletown" tend to eschew physical 
exertion) (Enid, Oklahoma).

Wellness to you, Bob, and everyone else-

R-101

P.S. I was sure some newby might have been interested in my post about that 
big Corning sixteen inch blank, with its ultra fine, silky, scratch and 
gouge free fine grind (by me) that the guy said he would take 200 bucks for, 
tool and blank, but so far no one has shown any interest; I had a nearly 
complete mounting that would have carried it, but it disappeared.... (the 
mounting) see picture, second link.

http://www.atmsite.org/contrib/Harbour/Tool.html

http://www.atmsite.org/contrib/Harbour/Photos,%20med/ROLL2JPEG-11.JPG

Wellness to you, Bob, and all-

Davey



----- Original Message ----- 
From: "Bob May" <rmay@nethere.com>
To: <atm@atmlist.net>
Sent: Tuesday, March 25, 2008 9:50 PM
Subject: Re: [ATM] ATM: "Fortune favors the bold"


>I don't like the idea of putting an abrasive of AlO2 on pitch as
> it is then difficult to get it off for the final polishing.  I've
> used up to 12 micron grit on pads with good results but it does
> tke some time to get the grit out of even the pads so that CeO
> can be used for the polishing.
> Please note that the purpose of pads is to just shorten the time
> it takes to get the glass into the polished condition.  Dale
> Eason's photo of a surface is fairly typical of what is obtained
> and it takes only a short while to smooth that surface out to a
> nice smooth surface that one can be proud of.  Pads are intended
> to be used fast and furious as the eyeglass industry uses a lot
> of pressure on the pads to polish up the glass surface that they
> do.  So put your back into it and press down and move the glass
> fast, strokes per second rather than strokes per hour, and the
> surface will shine in short order.
> With pitch, you can change the ROC by a lot as you proceed with
> polishing (I had one guy move a 30"ROC by an inch on a 5"
> surface!) while pads will just evenly keep on cutting all of the
> surface to the same ROC all the way through the glass if you go
> that far.
> Bob May
>
> rmay at nethere.com
> http: slash /nav.to slash bobmay
> http: slash /bobmay dot astronomy.net
>
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


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