To: "Ken Hunter" 
Cc: "Gary McKenzie" ,
    ,
    "Bill T." 
From: "Don R Surles" 
Reply-To: "Don R Surles" 



The CeO we used in the Mid-Atlantic Mirror Making Seminar Feb 28-Mar 2 was
0.3-0.5 microns.   The results were highly polished mirrors and no sleeks
or scratches.

Don...






"Ken Hunter" {at}shore.net on 03/04/2003 05:49:11 PM

Please respond to "Ken Hunter" 

Sent by:    owner-atm{at}shore.net


To:    "Gary McKenzie" ,
, "Bill
       T." 
cc:
Subject:    Re: ATM CeO particle size



What wasn't mentioned yet is that the CeO imbeds itself into the pitch so
that only a small part of it's true size is exposed during polishing. It
can be used as-is for a very fine grinding abrasive also but the posibility
of scratches at this size grinding is usually considered too great. Unless
you have 1-2 micron filters on your water supply, it's risky!

Ken Hunter


----- Original Message -----
From: "Gary McKenzie" 
To: ; "Bill T." 
Sent: Tuesday, March 04, 2003 2:25 PM Subject: Re: ATM CeO particle size


>
> Hi Bill,
>
> thanks for the info, I had always "believed" CeO was smaller than 1
micron,
> which was why I was surprised to find the 2 micron size. I will use it
per
> your advice.
>
> cheers
> Gary
>
> ----- Original Message -----
> From: "Bill T." 
> To: 
> Sent: Tuesday, March 04, 2003 12:14 PM
> Subject: Re: ATM CeO particle size
>
>
> > Hello Gary,
> >
> > Most ceo's are around 1 or 2 microns.  Can't really compare them to
grits,
> > since ceo is much softer acting.  What you have is probably ok to
polish
> and
> > figure with.  The cutting effect of ceo has more to do with its
> > concentration on the mirror's surface, than with the particle size.
When
> > you get to figuring, try to keep the concentration as low as possible.
> >
> > I have made mirrors with stuff as coarse as the 3 micron "Big C"
> suspension
> > intended for polishing window glass, to 0.7 micron Regipol suspension.
> > Honestly, I don't see any difference whatsoever in the performance of
the
> > mirrors done with either.  All these mirrors responded to the
flashlight,
> > solar caustic, and lazer-dot tests exactly the same way.  Just finish
up
> > with low concentration, and you should be fine.
> >
> > Bill Tondreau
> >
> >
> >
> >
> >
> >
> >
> >
> > >From: "Gary McKenzie" 
> > >Reply-To: "Gary McKenzie" 
> > >To: 
> > >Subject: ATM CeO particle size
> > >Date: Tue, 4 Mar 2003 10:09:25 +1100
> > >
> > >
> > >HI just wondering if anyone new the particle size of CeO? I've come
> across
> > >some marked "grade 1660, 2 micron". I'd always
thought that it was
finer
> > >than that - since I usually grind down to 5 micron.
> > >
> > >Gary
> > >
> > >
> >
> >
> > _________________________________________________________________
> > Tired of spam? Get advanced junk mail protection with MSN 8.
> > http://join.msn.com/?page=features/junkmail
> >
>
>







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