RE: ATM Grinding area cleanliness

["Scott Berfield" <sberfield@xbox.com>]

I subscribed to the "as long as it is lying on the ground it is safe"
school of thought. I tried - once into fine grinding - to avoid
disturbing anything in such a way as to raise grit into the air. When I
went from rough to fine, and from fine to polish, I put a new layer of
plastic right over the old one - debris, old grits and all. For my
turntable, I scrubbed it and put on a new coat of varnish when I
switched to fine and again when I went to polish. I made no attempt to
sweep or vacuum - grits on the floor can't hurt a mirror on a table
unless you do something to get them up there. Other than that I just
kept myself and my work apron clean.

I ended up dealing with one or two small scratches, but nothing major. 

It helped a lot that many people on this list reminded me - several
times - to worry less and grind more :)

-sb

-----Original Message-----
From: owner-atm@shore.net [mailto:owner-atm@shore.net] On Behalf Of
pbunn
Sent: Friday, January 16, 2004 1:16 PM
To: Bob May; atmlist
Subject: Re: ATM Grinding area cleanliness


I agree with Bob May - although I am not an experienced glass pusher
like Bob is.

You can worry yourself into problems.

Hanging plastic above the griding stand  and sweeping seems to me more
of a problem generator than a solution.  One popular  book highly
recommends hanging a plastic drop cloth from the ceiling.  I sure don't
do that and have not had problems on my three mirrors.

I have varnished my grinding stand with a single coat of polyurethane
slapped on after fine grinding to seal down any loose grit.

Use common sense and have fun,  in my experience, the more that you
think about what you are doing, the more chance that you have to fall
into a non- random process and screw things up.

Pat Bunn

----- Original Message -----
From: "Bob May" <bobmay@nethere.com>
To: "atmlist" <atm@shore.net>
Sent: Friday, January 16, 2004 12:56 PM
Subject: Re: ATM Grinding area cleanliness


>
> Cleanliness is a very interesting subject when talking about
glassworking.
> Twyman has a bit of info on the subject in his book that can be of
interest
> to many.  Basicly, he considered that grit sitting on a table to be
innocent
> unless somebody picks it up and deposits it on a glass surface.  Thus 
> you don't put your hands or other things on the table and carry them 
> over the surface you are grinding as this will allow the grit to be 
> carried up and over onto the surface.
> He also noted that fine scratches tended to go up when the floors were
well
> swept as the fine grits on the floor would be tossed into the air and,

> by Murphy's Law, the grit would land on the surface of the glass.  
> Same thing with heating vent systems blowing air all over the place.
> I consider that the rough grinding (down to 320 grit) is coarse 
> grinding
and
> just keep working along with the old grit without any problems.  When 
> the 320 grit is done, I then clean up and go onto the fine grits.  
> Instruction is given as to the process of not passing things over the 
> glass at this point as this could carry grit up and over the mirror 
> and thus allow the grit to fall on the surface of the mirror and make
a problem.
> Anything more that you do than this I more consider just being
supersafe.
> I'm not going to be taking a shower and fresh clothes every 2 hours 
> when going down through the grits tho.
> Bob May
> http://nav.to/bobmay
> bobmay@nethere.com
> NEW! http://bobmay.astronomy.net
>
>
>