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I've seen plenty of glass bottles cut into cups online and have been thinking that, as a college student, I needed some of these. I spent time looking at different methods of glass cutting and decided that they all had flaws in their procedures. So, I combined several of the methods together to get what I think is a lot better method of doing it. 

Excuse some of the blurry close up photos, the camera I used doesn't take good close ups. 

Step 1: Materials

The materials are pretty straight forward.

String
Scissors or a utility knife
Lighter
Denatured Alcohol
A bucket of cold water
Fine grit sand paper
Glass Cutter
Clamp
Scrap Wood
The glass bottles you wish to cut

Step 2: Scratching the Glass

As you can see in the picture, I used a clamp to clamp the glass cutter to a bunch of scrap wood pieces to the height I wanted to cut on the glass. Using plenty of pressure and keeping the bottom of the glass on the ground, I turned the glass against the cutter to create a scratch around the glass.

Step 3: Cutting the Glass

Once scratched, the glass must be cut. To do this, start by taking a string and tying it around the bottle at the height that the glass is scratched. I then found it best to cut off the extra hanging pieces as best as you can. You should then remove the string and submerge it into the alcohol. Then replace the string around the bottle along the scratch. At this point you will take the lighter and light the string. I found that once lit, it works well to rotate the bottle so the flames evenly around the glass. Once the flames are mostly extinguished, submerge the glass into the cold water bucket. You will hear the glass break, and you should be able to gently pull the glass apart. 

As you can see in the pictures, you may not always get the greatest glass break. It seems that this occurs at the knot and i'm still trying to figure out exactly what to do about that problem. For some reason, all of the Heineken bottles i tried didn't break very nicely and neither did a few of the corona glasses. The last picture broke because I tried a higher grit sand paper, and the glass had a small hairline fracture. This is why I recommend a fine grit sandpaper.

I started with 6 Corona bottles, 3 Heineken bottles, 2 Miller Lite bottles, 2 Absolut bottles, and a Black Velvet bottle. In the end I got 3 finished Corona glasses, 2 Absolut glasses, and a Black Velvet tumbler glass. The glasses I lost were due to trial and error and now that I have a good system down, I plan to make a bunch of other glasses, and shouldn't have such a high loss. 

Step 4: Sanding the Edges

You will now need to sand the sharp edges of the glasses. I read online that you should do it in a circular motion, though It didn't seem like it mattered to much for me. Some of the edges didn't break perfectly, so first I focused on these. Then I moved to the edges. These are the most important, due to the fact that you will be drinking from it. To sand the edges I just took the sand paper and went at it until the edges were no longer sharp to the touch. 

I would recommend using a glove when sanding, because you have to remember that you are sanding off glass shards. I would also recommend washing the glasses before use.

Step 5: Finished!

You now have some cut glasses with which you can enjoy your beverages. 
<p>Hey, awesome tutorial! For some easier and cleaner ways to cut glass quickly check out the guide we posted:</p><p><a href="http://www.upcycled.io/2016/10/12/3-neat-ways-cut-upcycle-old-glass-bottles/" rel="nofollow">http://www.upcycled.io/2016/10/12/3-neat-ways-cut-...</a></p>
<p>sounds like a good honest tutorial,I will definitely give this a try.thanks</p>
This is an awesome instructable.. I love recycling especially making things we would otherwise have to buy in the store. I've been reading up on this and heard that the beer bottles are tougher to cut evenly because the glass is thin and fragile. Can't wait to try I have tons of elastic hair bands :)
I'm going to give this a try tomorrow, does it work for square bottles?
I haven't tried square bottles, but I did do a southern comfort bottle, which isn't completely round and it worked fine.
I'm going to give this a try tomorrow, does it work for square bottles?
Very Cool <br>
great idea!! you can use any kind of flammable substance to help with cutting. you could find a gel and get rid of the string. Marines use C4 stuck to the side to heat the glass up, or bury it half way in sand and light diesel fuel around it. Either way the heat has to be uniform around the glass to have a clean break.
You should try a skinny hairband the ouchless kind have a continuous band and that might work in replacement of the string, eliminating the knot! Never tried it just a thought though.
I tried it out and It worked really well. I'm definitely going to have to do this when I get more bottles. Being that there is elastic in the band, I can just stretch it over, saving me the hassle of tying string onto the bottle every time. Thanks for the input.

About This Instructable

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Bio: I'm a college student who enjoys working on projects and living the college life.
More by ProRock:Cutting Glass Bottles Pallet Trunk Antler Coat Hanger 
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