ATM Grinding area cleanliness

["mlbrown@everstrive.com" <mlbrown@everstrive.com>]

Line the buckets with trash bags and just toss them away.  Grit can easily
embed itself in plastic buckets and become unwashable, only to come loose
later.

The same goes for your grinding area.  I use many layers of newspaper,
which I just lift up carefully and throw away.

I've found the most effective tool for cleaning grinding tools is a hose
with a fine focus nozzle.  I take the tool outside and blast away.

The largest mirror I've done was a 10" and I found I didn't need cleats for
grinding; wet newspaper has plenty enough holding force to keep the parts
from sliding around when grinding, so you can eliminate the cleats and the
potential contamination hazard.  I need cleats for polising, however, but
then you are past the contamination hazard if you wait until then to put
them on.

The worst is your fingernails and clothes.  So I always change clothes and
take a shower between grits, and use a fingernail brush.  I use a spray
bottle to keep things wet, and have found that grit migrates from my hands
to the bottle easily, so don't forget to wash that.  I also use a series of
towels to dry my hands, one for each grit.

If you are keeping your area wet, you shouldn't need the air filter, though
it is a good precaution.

=Matt


Original Message:
-----------------
From: c f quantemlp@hotmail.com
Date: Thu, 15 Jan 2004 19:05:30 +0000
To: bobmay@nethere.com, atm@shore.net
Subject: Re: ATM chasing pits??




Thanks to all that have replied to this.  I am a "newbie" when it comes to 
mirror grinding and a question or two or three are bound to come up.  I
have 
cleaned up the entire area, cautious in doing one grit a night, all
buckets, 
containers, and brushes then run through the dish washer while the grinding 
board I use (at the kitchen table, 18" x 18" board, with 3 cleats, non skid 
padding under the board) gets washed down, along with the table, chair and 
floor.  I am also grinding with a air filter system running on high trying 
to keep as much dust away as possible.

Again, thanks to all

Charles in wilmington,


>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
>
>
>

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