Re: ATM chasing pits??

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

After 2 or 3 rounds of grinding pits out (they usually go in a single wet)
that show up, you are starting to chase pits around the mirror.
What is happening is that the grit is breaking off pieces of glass that are
larger than normal as the cracking process is somewhat random and, as a
result, there will be big pits and small pits.
When you start chasing pits, it is time to go to the next grit size and
grind out those large pits as well as get the general surface fined up
nicely.  Then you will have some finer pits to chase around the mirror.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net