[ATM] Bartel on Polishing

[hermit]

If any of the folks from the mirror lab are still on the list, perhaps 
they can chime in here.  Short of some equipment to test mirror surfaces 
we can speculate for the next year.  I think I remember that when Bryan 
Greer had some surfaces tested for scratch/dig he paid some big bucks to 
have a fairly small surface area tested.  Key here is "Zambuto had wrote 
theorized".   The last word is key.  Polishing past the point of any 
real gain may be a safety margin he has come to feel comfortable with to 
assure quality.

Ken Lowther

Mitch wrote:
> -----Original Message-----
> From: atm-bounces at atmlist.net [mailto:atm-bounces at atmlist.net] On Behalf Of
> jeff newsom
> Sent: Sunday, December 17, 2006 1:19 AM
> To: atm at atmlist.net
> Subject: [ATM] Bartel on Polishing
>
>
> Nice reminder. Very good points not to be overlooked . One question. As you
> well know, Carl Zambuto recommends long hrs of polishing(12 hrs I believe
> for alot/most? of his optics.....) what are your thoughts on that?  when
> does the law of diminishing returns kick in? Is there data somewhere
> supporting extended polishing???
>
> Cheers---Jeff Newsom
>
> A letter someone posted on one of the groups that Zambuto had wrote
> theorized that you not only want to get all the pits out but the
> "sub-surface" micro fractures deeper within caused by grinding to get a
> "truly" polished surface.
>
> Mitch
>
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