Step 9: The finished piece!
So now comes the fun part...actually scoring and cutting the glass! First, set the backstop to a point where the center of the bottle is laying flat on all four rollers. Then, adjust the cutting head to determine where you want the bottle to snap and tighten the conduit hanger bolt to keep it from moving. Apply a moderate amount of pressure to keep it steady and carefully spin the bottle to get a nice even line (you'll know you're pressing hard enough when you see a solid white line appear and hear the scorer scratching against the glass) . One line should be enough...you don't want to create too many stress points on the glass.
Lastly, over a sink, SLOWLY pour boiling water over the line you made for about a minute (if you hear the glass start to crack a little, that's ok as long you don't see any large cracks forming perpendicular to the cut), and then run cold water over it. You may have to repeat this process a few times, but the difference in temperature should be enough to simply pop the bottle off where you scored it giving you a nice clean cut. If the edges are too sharp still, lay some wet/dry sandpaper on a flat surface, put a few drops of water on it, and rub the bottle in small circles over it. And that's it!
Stay tuned for the next instructable to see how this wine bottle lamp is made! Thank again for reading, hope you enjoyed!!