Re: [ATM] Cutting Plate Glass & looking for strain..

[Guy Brandenburg <gfbrandenburg@yahoo.com>]

I lied. It's only 3/4 inch thick. And it was in the trash. We can cut 20 inch disks out of it. There is a huge bevel. I used two large sheets (10 in by 10 in, roughly) of polarized plastic sheeting that I got from SS or AmSiSurplus or some such place. No strain

Russell Jocoy <russjocoy@hotmail.com> wrote: 

Guy,  and all on the list,..... Most plate glass of a thickness more than 
1/2" is not tempered..
Not because it can't be,.. just because the cost is very expensive. Don't 
get me wrong there are always exceptions to this rule, and sometimes strain 
rear's it's ugly head.
   If you are worried about strain in the glass, take (or buy) some 
"polarized" sunglasses... Then buy another cheaper pair, or look for some in 
your old sets or at "Good will", you will know if they are polarized by 
turning the lenses in rotation to get a "black out" You will know this when 
you see it.
   Wear the polarized glasses, and place the other polarized lens behind the 
glass you are inspecting,
now move it across the back side of the glass and twist until you almost get 
to black...now move the back lens around and look for "dark matter" or "dark 
area's" If you see "shadows" the glass has too much strain to grind or work 
with.. A good test is one of the side windows on your auto..
Most of these are "tempered" glass, doing the test on this will give you a 
feel of what tempered glass looks like polarized. Most windshields are 
layered plate nowdays...
      I am very interested in where you found 1 inch thich plate glass?? I 
have been making circles out of 3/4" plate for 3 years.. I do have a 
system...... Russ Jocoy...I am willing to reveal my cutting process, and 
other's if you can tell me where you are getting 1" thick plate glass. 
(remember if you can cut the glass with a diamond blade, and it does'nt 
explode into a billion piece's, most likely it is not tempered)

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Guy Brandenburg, Washington, DC
My home page on astronomy, mathematics, education:
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or else 
http://tinyurl.com/r6fh2

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