Re: ATM Grinding area cleanliness

["pbunn" <pbunn@patbunn.com>]

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
>
>
>