How to Cut Glass Bottles quick and clean

[@paracordwizard]

Very nicely done video. I would like to offer a couple of comments on your process. - You may find that placing a bottle on a turntable rotating at 45 RPM or even 30 RPM allows you to heat the score line very uniformly and helps prevent the build up of too much heat in any particular area. - "Dry Cracking" which is what I call your method can be very tricky. The heat from that 2400 Degree F torch tip at some point heats the bottle intensely and it only takes a few seconds to impart more energy into the bottle than is needed to cause the score line to separate. This is especially true of the thicker glass bottles. So sometimes that results in edges of the cut which are very rough or oddly shaped. The other problem I found on bottles whose vertical walls were not of uniform thickness around the circumference or the score line was that the score line would separate at the thinnest area and the crack would propagate around the bottle until it encounter a point that was to thick to break. As you apply more heat, instead of the thick glass separating, a vertical crack shoots up or down the bottle where the thin glass meets the thicker glass. My suggestion would be use a micro torch like the Bernzomatic 3 in 1 that comes with a Heat Blower attachment. The heat blower attachment when used correctly (heat for 10 secs then shut off the flame with the special button) will blow air out the tip at 350F. Have the bottle rotate on a turntable / record player and direct the heat blower tip right on the score line. After 2 mins (for a beer bottle) plunge the bottle into ice water and you will have a straight smooth perfect cut. I took that method one step further and substituted an adjustable temp range heat gun for the torch - so no fire, no gas. Heating at 350F also means you won't damage paper or plastic labels on the bottles where you want to keep them. I posted a video demonstarting the technique here: kzbin.info/www/bejne/h3aVaXWQhciLb6Mrel=0 Cheers, Murray

[@DialedInDIY]

Murray M Thanks for the feedback Murray. I have tried a few different ways to cut bottles (some were in your list) but this was the most simplified way that I have tried. Unfortunately, I have had the problem you mention with vertical cracks which is why I slowly draw the bottle toward the heat source which gradually heats the glass. I actually have the same heat gun you use in your video so I am going to give that a try. A while back I made a rotisserie-type device (similar to a convenience store hot dog cooker) to roll the bottles while heating. So, I will either try to re-make the "hot dog cooker" or see if I can find a turntable (maybe I will just make a turntable since I have several salvaged motors I can work with). Happy DIY to you sir!