Re: [ATM] Polishing staining

[GARY FUCHS <gary@rcn.com>]

Mike,

Is there anything wrong with using a very dilute amount of liquid dish soap, and the rest as you describe? I stand the mirror up to dry and don't get spots but our water probably is on the hard side - but without particles or sediment as far as I can tell.

Thank you,
Gary Fuchs


---- Original message ----
>Date: Thu, 17 Jan 2008 10:40:12 -0600
>From: Mike Lockwood <melockwo@uiuc.edu>  
>Subject: Re: [ATM] Polishing staining  
>To: atm@atmlist.net
>
>Doug,
>
>I use the similar supplies, occasionally on plate, but usually on 
>Pyrex.  My guess is that the mirror is simply not getting cleaned 
>properly after polishing.
>
>I find that a mechanical process, i.e. wiping the mirror with the side 
>or palm of the hand, a paper towel, etc., is needed to completely 
>remove the residue left over from polishing.
>
>For a 6", I recommend a rinse of water, followed by a wiping with the 
>hand (covering all of the surface a couple of times), then repeat that 
>again.  To get it dry, I squeegee it off with my hand or a paper towel 
>until no water remains, and this prevents water spots, too.
>
>After the mirror is dry, you can use the heel or side of the hand to 
>feel around the surface.  Residue typically feels "sticky" as you 
>slide your hand across.  (A clean hand will not scratch the mirror, 
>just avoid playing in the sandbox before you do this.)
>
>I wonder how many mirrors have "roughness" simply because the mirror 
>maker didn't get them cleaned of residue after the last figuring step? 
>It's up to the optician to do this final cleaning - the coater can't 
>do it safely, and it isn't the coater's job.
>
>	Mike Lockwood
>
>Douglas Arion wrote:
>> I'm doing my bi-annual ATM class here...and having a
>> problem I've seen once before that seems to be
>> inexplicable: Polishing plate glass 6" blanks on Gugolz 64
>> using CeO from Salem, several of the students get a thin
>> filmy coating on their mirros which seems to be removable
>> with acetone and hard, and I mean hard, rubbing (we're
>> using surgical cotton), which does optically affect the
>> glass (which is then polished out with the next session).
>> Any ideas what's causing this? Was to eliminate it? Not
>> everyone gets it (I have fifteen mirror makers at the
>> moment), and no one who gets it sees it all the time, just
>> intermittently.
>
>_______________________________________________
>ATM mailing list http://www.atmlist.net/
_______________________________________________
ATM mailing list http://www.atmlist.net/