Yeah, I can go to Target and buy a set of glasses, but it is pretty cool to be able to use/recycle bottles that in many cases go in the trash.
And of course, you can always take pride in the fact that you made them yourself!
WARNING: There is the possibility of injury from broken glass when performing the steps in this instructable. Proceed at your own risk!
Step 1: Get Your Bottle
You'll also notice that most wine bottles have a big "dimple" on the bottom called the "PUNT". It is OK on a bottle, but not so nice in a drinking glass. Some people like the punt and glasses made from these bottles are often referred to as "punt glasses".
I prefer the flat-bottomed bottles commonly used with certain types of white wines. If you only drink red, try Bordeaux bottles, they are often flat on the bottom.
Beware: the nicer the bottle, the worse the wine usually tastes!
Step 2: Cutting the Bottle (part 1)
Wear gloves and eye protection!
There are many tools and methods you can use to cut a bottle; the cutter I used is all metal and I like it better than some of the plastic-framed models sold at craft shops. However, any jig that allows you to make a consistent scoring line around the bottle should be good enough.
This tool uses the scoring method which "cuts" a line around the bottle. Glass of course has a crystal structure to it and can't really be cut at room temp but rather broken in a controlled manner.
Once you score the line at a predetermined size you then move on to the next step.
Step 3: Cutting the Bottle (part 2)
The first time I did it I was very tentative but now it usually takes me only about 5 mins to cut a bottle.
Be carefull, the cut edges are EXTREMELY SHARP!
*Note: I've also had success by heating the bottle in the oven for about 5 minutes at 225 F and pouring water over the score line. You'll need to ruin a few bottles to perfect your method.
Step 4: Finishing the Edges
Professionals who do this for a living will "flame roll" the edges of the glass making them shiny and smooth like a standard glass. Unfortunately that requires specialized tools and you'll want to carefully anneal the glasses afterwards to minimize the chances of cracking and breaking.
** You cannot simply take a propane blow torch and get the edge smooth! If you try it, it will simply crack the whole glass. If you really want to do that, you'll likely need a glass worker's torch (usually Oxygen/Propane).
Using a Dremel tool, I first rough up the sharp cut using a Silicon Carbide conical grinding tip. Oh yeah, wear a dust mask, you don't want to be breathing ground glass!
Roughly grind the inside and outside of the edges using the Dremel. I also placed a strip of aluminum tape around the rim of the glass so that my grinding comes out as even as possible.
Continue to smooth out the edge using drum sanding attachments: I used 80, 120 and 150 grit. I would have used finer grits but that is all that I could find for the Dremel.
After a while, you'll have a fairly smooth edge that although usable, it is still kind of rough. Time to sand by hand using 200 grit sandpaper or finer.
You can keep going with a finer and finer grit, but if you want to finish the glass sometime this year, you'll call it a day after 200 grit.
You can also use a wire wheel on the lip, you'll get a shiny silver edge on glass that actually looks pretty cool.
Step 5: DONE!
Or etch the glass with your sweeties' initials, making it a nice gift.
Of course, if you have a laser engraver, it is even easier and you can make some very intricate designs that way.