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Glass Tips & Tricks 

Newsletters from our past converted to fresh articles about stained glass.
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Fixing A Small Break In A Big Piece Of Glass
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Click Here For The YouTube Video of this article

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Here's the pattern for the piece of glass I need to replace. You can see it's got a very small chip in it, just a crack that went down and came right back up. I put foil on the broken glass and soldered over it. It looked fine until Jeanne cleaned the glass and then it stuck out like a sore thumb, there was no way to cover it up, so we have to replace it.

"The difference between a professional and an amateur is that a professional will fix their mistakes" -David Gomm



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I drew a line on the glass to show a method I considered, just placing foil on the curve of the red mark and making a false lead line. This would have been okay, but it would have diminished the look of the big panel. I did an article about that type of repair and you can view it by clicking here.


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I start by scoring the piece of glass many times, cutting it in strips about 1" wide. When I finish cutting in one direction, I go in the opposite direction. I make sure to get a score right into the corner so I can remove that glass easily. 


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I then need to slide the glass out so that I can break it loose. As I do so, I find that the end of the panel is wobbly, so I slide a stick under the panel to provide extra support.  The stick spans from the worktable to the saw table.


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I place a trash can below the window.

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Then I can begin breaking out the pieces of glass.

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When I get to where I tried to patch the break in the glass, it's pretty easy to see.

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I continue to break out the pieces of unwanted glass.

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Then I take a hot iron and melt the solder. I hold the foil, that was holding the old piece of glass in, gently and pull it as it's released.

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With the foil removed, I run the iron under the edge of the glass to get rid of any "icicles" that might catch as I slide the panel back onto the bench. 
 I remove the stick that has been holding the end of the panel while I support the panel and slide the stained glass onto the work table.


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The replacement piece of glass takes up a good portion of a full sheet. I trace it out and then score and break off the extra glass.

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I then cut it out like any normal piece of glass, using a hand cutter and our orange glass cutting oil.

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Then Jeanne grinds the rough edges off of the glass so she won't get cut.

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She then dries the glass off with a towel.

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And she foils the glass with 1/4" copper foil.

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She goes all around the piece, pinching and holding the foil in place.

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Then she uses a fid to burnish the foil tightly to the glass.

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I can now place two pieces of scrap glass onto the work table to hold the replacement piece to the correct height.

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I set it in place and check that the edge lines up with the other glass.

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Since the nails and pattern are removed, I use the stick I used earlier as a straight edge to insure that the glass is flat along the bottom of the panel.

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I apply flux to several spots along the replacement piece.

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And I solder the joints to hold the replacement piece in place.

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I then completely solder the repair in place. Later I'll turn the panel over and solder the backside.

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