Re: [ATM] polish time for 13 inch

["Anthony Anconetani" <Anthony.Anconetani@genband.com>]

Hi Mel,

How do you do your micro-faceting? And, do you regularly re-facet?

Thanks,

-Anthony 

> -----Original Message-----
> From: atm-bounces@atmlist.net 
> [mailto:atm-bounces@atmlist.net] On Behalf Of Mel Bartels
> Sent: Wednesday, July 18, 2007 12:33 AM
> To: atm@atmlist.net
> Subject: Re: [ATM] polish time for 13 inch
> 
> > Uh!!...sry...I should have asked this with previous post, 
> but how do 
> > you go about pressing an oversized lap???
> 
> The same way I do any lap.  I keep the mirror in constant 
> motion, so it's irrelevant if the lap is larger than the 
> mirror diameter, because some portion of the mirror overhangs 
> and some portion of the tool is exposed.
> 
> I never cold press - it's a waste of time.  For that matter, 
> I don't hot
> press either - that's not effective.   Warm the pitch's 
> surface only to the
> extent that a few strokes of the mirror with thick polishing 
> agent will bring the lap back into contact after last night's 
> figuring session.  Then if necessary 'freeze' the lap surface 
> by a dunk in cold water for a few moments.
> 
> I never channel, I always micro-facet, and let the lap fill 
> in.  It's OK if
> the lap's channels/facets close-up.   The pitch is still 
> flowing.  You can
> get some wonderfully smooth beautiful looking surfaces this way.
> 
> Mel Bartels
> 
> 
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