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Tool Talk Discussion Forum

Glass cut .

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dr.sportster

01-16-2008 13:52:41




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Something weird I read in that military manual on glass got me to thinking.It said that if you score the glass and dont cut it right away the score fills back in.Then I remebered glass is a liquid not a solid and it made sense.An old window also gets thicker on the bottom.Ok ill shutup now[Im waitin for msc to deliver a silver &deming 17mm drill bit[]Have a nice day.




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Morty-Alberta

01-17-2008 08:55:22




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 Re: Glass cut . in reply to dr.sportster, 01-16-2008 13:52:41  
It won't fill in but it won't cut along it very well either, sometimes when you cut glass you get what is known as a 'hot cut' where it is sitting there crackling with little pieces of glass flaking off, you have to hurry up and snap it or it will crack all on its own wherever it feels like. Cutting old glass is difficult because the surface is full of tiny pits that can cause the force of snapping off in any direction. As to cutting underwater it works, I have cut new guage faces this way with 2mm (single diamond) you just kind of nibble it away, it isn't too neat but it gets the job done. Lubricating the cutter works well, I keep mine in a paint top with paper towel soaked with light oil all the time, also new cutters don't seem to work well so I make a bunch of cuts on scrap before using one- and dull ones don't work either so its a bit of a guessing game, and if you drop the cutter its toast!!

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Bus Driver

01-17-2008 07:03:50




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 Re: Glass cut . in reply to dr.sportster, 01-16-2008 13:52:41  
In classifying glass, it does not fit into the neat categories of most other materials. Physicists often describe glass as a "supercooled liquid". Google will offer more info.



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WaltMo

01-16-2008 18:00:21




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 Re: Glass cut . in reply to dr.sportster, 01-16-2008 13:52:41  
Glass is only liquid at high temperature(2000�)more or less. WaltMo



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TomH in PA

01-17-2008 18:40:02




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 Re: Glass cut . in reply to WaltMo, 01-16-2008 18:00:21  
Physicists have their own definitions for liquids and solids. Just because glass is stiff at room temperature doesn't mean it's a solid. It's still a liquid; just a really, really high viscosity liquid.



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Bud in WV

01-16-2008 16:53:08




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 Re: Glass cut . in reply to dr.sportster, 01-16-2008 13:52:41  
I used to do some stained glass work - years ago. It's true that the "score" remains on the surface but the break WON'T follow an "old" score completly. Naw, I don't know when a score is considered "old".... just make the break as soon as you've scored it.
Also, when you "cut" glass it's best to use a 50/50 mix of kerosene and WD-40 to "lube" the cutter wheel.



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Old Magnet

01-16-2008 16:11:10




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 Re: Glass cut . in reply to dr.sportster, 01-16-2008 13:52:41  
What it will do is get more brittle with age.
Trying to cut old glass is pretty iffy.



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dave guest

01-16-2008 16:10:29




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 Re: Glass cut . in reply to dr.sportster, 01-16-2008 13:52:41  
Old hardware store man used to tell me you could cut glass underwater with a pair of scissors. I told him, "show me". He never did. What could he have meant?



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Nolan (foxtrapper)

01-17-2008 02:51:43




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 Re: Glass cut . in reply to dave guest, 01-16-2008 16:10:29  
That you can cut it with scissors underwater. Btdt. Kinda interesting. Sheers or snips work better. The glass doesn't shatter, it flexes and cracks along the line of the scissors.

Been a long time since I did this. You should try it some time for a lark.



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RayP(MI)

01-16-2008 14:46:16




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 Re: Glass cut . in reply to dr.sportster, 01-16-2008 13:52:41  
Naw. Glass won't fill in scratches, scrapes, scoring.... They're there as long as the glass remains!



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