Cutting Glass Bottles with a Wet Tile Saw

I have seen a number of craft and interior design projects on ETSY that are using rings cut from recycled glass bottles. I tried it recently and my glass rings were not very even but it did work.

There is a step by step instruction at:

http://www.instructables.com/id/How-to-use-a-wet-tile-saw-to-cut-glass-bottles/