Step 6: Cutting the wine bottle
13. Place a drop of oil on the glass cutter wheel. There is no need to get fancy here and olive oil works fine for this project. Score your bottle with one nice even line by laying it in the jig, as pictured, and spinning it slowly. Listen for the slightly annoying nails-on-a-chalkboard scoring sound to know that you are applying enough pressure. Don't try to repeat the score or reverse your spin. Don't try to use all of your might on the score line. Those big muscles are totally unnecessary and too much pressure might cause little chips in the glass.
14. Bottles with labels, label goo, etchings, or printed glass will not cut as well. You want smooth, clean glass. A little hot water or "goo gone" helps to remove labels.
15. Heat your bottle with a candle or lighter along the score line. Now run the bottle under cold tap water at the line. Repeat a few times then try to gently pull the two halves of the bottle apart.
16. You now have a cup and a possible chandelier! Now don't cut yourself before you smooth out those edges.
17. Bonus tip: a dremel with a diamond bit works great to smooth the edge, then sand with sander bits and polish up if you like. I got a set of 20 diamond bits on amazon.com for $5. I have also hear its possible to just place your cup, top edge face down in a bowl of sand and twist in the sand. I haven't tried this.
18. Have fun and impress your friends!
FYI. This makes glasses of one length. But without any additional construction, you can flip the cutter to the outside of the jig to make your cups about 1" taller. In addition, if you have a different size cup in mind, just build your jig accordingly (using slightly wider board-stock).