Forget glass cutters. This is sooo easy. Take a string and wrap it around the bottom of the bottle. Then take a small paint brush and "paint" the string with gasoline. Light the string and when it goes out, dunk the bottle in cold water. It will fracture on the string line. I use this method to make my "Hot caps" for the garden.
Score the bottle with a blade or scriber where you want to cut it.
Then fill it with hot water & allow the bottle to heat up a bit.
Then rub quickly around the score with a piece of ice.
9 times out of 10 it will break cleanly at the score.
As promised. This isn't all of them I did in one day. I still have more to do, probably this weekend.
Bought a cutter at Hobby Lobby. After scoring the glass I put the portion I wanted to keep in 200 degree water I had in a stock pot on the stove. After the glass heated sufficiently I put it in another stock pot of ice water. More often than not the glass would crack and may or may not break cleanly. Going back to the hot water would finish the job.
If the glass was thin or had bubbles in it it wouldn't break cleanly. Some were salvageable, some weren't.
Illinois slumdog #8
Never speak of pencil sharpeners.
If it is for some other purpose, my bad.
that petrol tip sounds pretty neat! I have tried to cut through a beer bottle once with my dremel tool with the standard cutting disk and it jsut broke the bottle and scared me a little. I will try that tip though, sounds interesting.
Hi every body, also there is an other simple method; pour the some engine oil (also you can apply the black engine oil which is used and not refined) inside the bottle, the surface of oil inside the bottle indicates the cutting edge and then make an iron shaft hot red on a flame then inserting the shaft inside the bottle and you will see the result.