Re: ATM [long] Getting the smoothest mirror (no dog biscuit)

[Larry Manuel <lmanuel@sprint.ca>]

Michael J. Coslo wrote:

> >My lap is encrusted with ceo.
>
>         Hmm, maybe it needs a decongestant.
>
> >Should I just add water until the ceo stops leaching off the lap?
>
>         The CeO on your lap is actually a good thing.
>
> >The lap seems to be sticking when the wet stars to dry up, I don't seem
> >to be getting good drag.

I had similar problems, and would occasionally scrape off about 1/2 a mm of the
lap surface, exposing fresher pitch, then hot press and achieve good, quick
polishing action.

I also experienced hours of machine work with a thick slurry of CeO, which did
not polish at all.  I might as well have had grease between the lap and work.
It's hard to describe how 'thin' to make the slurry.  A tablespoon of solids in
1/2 a cup of water - or even more water is workable.  A drop of detergent
helped me a lot, too.

>

There is a hard-to-define feeling when the lap begins to work, instead of just
drag across the glass.  I found warm pressing, and generous cool pressing
finally brought my lap into real contact, and then I realized it had been
skidding previously - not making 100% contact before.
Larry Manuel.
--


lmanuel@sprint.ca
Mississauga, Ont.