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[Rockoteer]

Is this okay to do?  Put my glass jar in my 10" or 14" saw's vise and cut the bottom off.
tks in advance
Gary aka TOG aka Rockoteer aka 'Hey you'

[Ranger_Dave]

I would think you can. I cut obsidian all the time, it's just "glass." I use a regular class cutter though, the kind with the little carbide wheel. I made a jig to hold the cutter and then roll the bottle in it. I gave it away years ago or I would take some pictures.

I just did an internet search on "homemade bottle cutter" and it came up with pictures for at least 20 different variations.

Now, if you want to do something fun, take some string, put a few wraps around the bottle. Coat liberally with acetone (finger nail polish remover). Light. When the flames die down, dip in cold water. It will..... should..... break along the line just heated.

[Rockoteer]

I would think you can. I cut obsidian all the time, it's just "glass." I use a regular class cutter though, the kind with the little carbide wheel. I made a jig to hold the cutter and then roll the bottle in it. I gave it away years ago or I would take some pictures.

I just did an internet search on "homemade bottle cutter" and it came up with pictures for at least 20 different variations.

Now, if you want to do something fun, take some string, put a few wraps around the bottle. Coat liberally with acetone (finger nail polish remover). Light. When the flames die down, dip in cold water. It will..... should..... break along the line just heated.

Yes, I saw that also.  I noticed one video was using a wet tile saw with different blades mk303 and some others.  Some were special glass blades.  Those seemed to me to be my answer.
tks.

[Ranger_Dave]

A tile saw should handle a glass bottle easily.   I still like the fire method better. 

[Orrum]

Wear gloves, glass makes lil sharp things more than onsidian!

[Ranger_Dave]

I was just thinking that. A rough blade at a high speed might make a rough cut with lots of little chips. Maybe the water/oil would take care of that. Wear eye protection.

[irockhound]

A thin kerf blade is best for glass.  Since it is hollow and only a thin piece of glass compared to a chunk of obsidian it acts differently.  A wide kerf blade like a tile saw normally has will chew up the bottle and make so many chips it takes a lot of after grinding unless the blade has been changed to a non tile blade.  A 303 or similar continuous rim blade (not notched types) are best.