From: "Russell Jocoy" 
To: bcjawsss24{at}verizon.net, atm{at}shore.net
Reply-To: "Russell Jocoy" 


>From: "Arthur" 
>Reply-To: "Arthur" 
>To: "atm{at}shore.net" 
>Subject: ATM Port hole glass
>Date: Tue, 1 Jul 2003 04:21:34 -0400 (Eastern Daylight Time)
>
>
>Hello,
>I have a 16.5 inch port hole, and is 1 inch thick. On one side, it says
>Heat Treated", do I take this to mean that it is stressed glass?. To get a
>quick response from everyone  " Can this be used as a mirror
blank"? If so,
>each side has a minor chip along the outer edge, the smaller of the two, is
>1.5 inches long, 1/16 deep and 3/16 wide (across the glass surface). The
>other is not much worse, just longer and slightly deeper. Can this be
>ground
>out?; the surface seems to be fairly flat using a metal carpenters measure.
>I would like to make a RFT, if I can use this thin glass.
>
>Thank you,
>
>Bill Morgan
>(alias.. Arthur)
>
>
>"At last I able to merge from the shadows that have bound me, and once
>again, I crave to see the light through the end of the tunnel."
>

("atm{at}shore.net")

Bill,

     I would suggest to do a polirization test to look for stress in the
blank. If  you have some old polerized sunglasses that you don't care about
, separate the two lenses.  With one fixed to your eye , look
through the glass with the other half on the other side of the glass.  Turn
the polirized lens on the opposite
side of the glass until it almost turns black. Now move across the glass
slowly in the same position,
if you see ghost clouds in areas or dark ring fringes then the glass is
tempered and useless.
    Check all areas, if you see ripples thats OK but any dark shadows mean a
no go for grinding...
            Don't worry about the chips on the outside, if your glass is OK
then put the biggest chip on the bottom and bevel the top side, it will
grind out enough not to matter...  good luck
                              Russ Jocoy
("atm{at}shore.net")

_________________________________________________________________
Tired of spam? Get advanced junk mail protection with MSN 8.
http://join.msn.com/?page=features/junkmail

--- BBBS/NT v4.01 Flag-4