Re: ATM Dog biscuit

["Bob May" <bobmay@nethere.com>]

>From what I have seen, there's two reasons for the problem.  First is that
the CeO (according to some) has a chemical action with the glass on a very
fine level and this may get the problem started.  The second is that when
polishing fast, the glass will warm up and as it warms up, it presents
itself to polishing forces a lot more than the rest of the glass around it.
This then means that it gets shaved off and, unfortunately, cools itself off
and thus retreats from the surface of the lap allowing for another area to
become the primary support and thus heat up the new area.  This becomes an
oscillation of abraded areas and the only way is to slow down the polishing
by a drastic amount to get rid of the problem.  The other thing that can be
done is to use a polishing agent that works slower so that the heat from the
polishing is less.