How to Cut Glass Bottles

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Introduction: How to Cut Glass Bottles

I show 3 methods to cut glass bottles. One with a string, one with a glass cutter, and one with a homemade bottle cutter. After a few tries cutting the bottles it becomes pretty easy to do. You can make drinking glasses, lamps, vases, and many other things from the cut bottles.

Step 1: Method #1

The first method is with a string that is wrapped around the bottle then is soaked in a flammable liquid. The string is lit on fire while the bottle is being rotated, when the flame dies down the bottle is put into cold water. This causes the bottle to break where the rope was. Make sure you take all of the necessary safety precautions so you don’t get injured.

Step 2: Method #2

The second method is to use a glass cutter and hold it on an object you want the height of the bottle to be cut at. The glass cutter is held in place and the bottle is spun around giving it a level score line. The score line on the bottle is then held over a flame while the bottle is rotated. After the bottle has heated up an ice cube is rubbed around the score line. After a while the bottle breaks apart.

Step 3: Method #3

The third method uses a bottle cutter which can be bought or homemade. The bottle cutter holds the bottle in place while it is rotated around a glass cutter giving it an even score line. It can be adjusted depending on where you want the bottle to be cut at. The one I used was homemade. The same way is used to break the bottle apart that was used in the second method.

How I made the glass bottle cutter: (https://www.instructables.com/id/How-to-Make-a-Glass-Bottle-Cutter/)

Step 4: Watch the Video

(The video may not show up for mobile viewers)

https://youtu.be/_76j-UL3iZM

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    46 Discussions

    I accomplished cutting even bigger jugs quite nicely. It takes a bit of practice to get the feel of working with glass. It doesn't take a huge temperature change/shock to force the break at the score line. Good luck, well worth trying...

    http://www.madebybarb.com/2017/03/12/upcycle-your-bottles-into-cloches-domes/

    Instead of the ice/fire, why can't you just tap it like you would any other glass you cut?

    2 replies

    A glass item such as a bottle will break unevenly plate glass is a bit different it will essentially snap at the score line where as rounded glass sends the stress of the hit in all directions trust me found that out the hard way

    I am going to try a mix of two of the methods. If I use a glass cutter and some support in order to score a horizontal line around the cutting line, but THEN tie the string with oil around the bottle right on top of the scored line, the fire should do its job, but the break should be smoother, along the scored line.

    1 reply

    After 83 attempts and twelve stitches i can say with confidence it doesn't work unfortunately

    I need to cut some square bottles. Any suggestions or hints would be greatly appreciated.

    13 replies

    Try filling it with oil to the point you want the cut to be, then drop in a piece of metal heated red hot. I used a sawed off carriage bolt. Make sure it's on a level surface, put it in something to contain the oil, wear your PPE.

    Would it be possible to put a thin layer of oil on top of water instead? Just hold the red hot metal on the oil layer?

    Please don't try that. The heat into the water and oil could cause a volatile reaction. I played with oil and water mixture years back trying to anneal a piece of steal. It shot out droplets of hot oil all over the place. If you do attempt to use this process PLEASE be sure to have on a face shield, long sleves and gloves. Make sure to wear leather or wool or cotton. Synthetic materials will melt into you skin if the catch on fire.

    It should work with an inch or two of oil on the water. Maybe a thin layer would work. I think the trick would be to get the hot metal through the neck of the bottle and held at the right level. If you have a drill press, maybe you could use the chuck to lower it in vertically.

    I believe a diamond saw blade will cut glass. If I needed to cut a square bottle, I would try that. You could put one in a table saw or better a tile saw, and then cut the glass like you would a tile. Be sure to wear goggles, and gloves in case it breaks funny. If you don't have one, you can rent them from some Home depots

    You MUST have a water bath saw to cut glass with a power tool. A wet tile cutter saw is fine.

    This you may have to do by hand. I would practice the general principle on round bottles first. Then on a "rolling" table or with a jig cut straight lines on the four sides and connect them "free-hand". Repeat this scoring a couple of times. Use your most useless bottle first. IT WILL GO WRONG SOMETIMES! Above all, be safe. My word glass is sharp!

    I cut my bottles n jars using the string, acetone and cold/ice water method, maybe that would work the see on square i don't see why it would work, after you make your line around bottle, you dip the string in the acetone and wrap it around on the line wearing gloves make sure you push the string onto bottle well, and drop into the water it just breaks off really easily, worth a try :)

    What do you do to make your line around the bottle? Do you use a glass cutter? Thanks and I apologize for the simple questions - I know it's not a stupid question - there's no such thing as a "stupid" question. I just means that person doesn't get that part and wants to know. That's what I tell all the people who ask me computer questions and say they're sorry that they are asking stupid questions. Wow...got a little wordy there. I have a tendency to do that. :/

    The oil costs to much to make many cuts and it did not work for me at all anyway.

    If you're using the "blade and oil" method that's on youtube, I think that's a hoax. You'd need more thermal mass to get things hot. Used motor oil is free, and you can always reuse the oil.

    I suggest a water-cooled tile saw.

    Tried that. No matter how slowly & meticulously we tried, some glass just would not "cooperate"!! We used a relatively high-end water-cooled saw with a new abrasive wheel.