Made with inexpensive plumbing tools, polished with available materials.
Step 1: Aquiring materials
- Copper pipe. 3/4" pipe makes approximately a size 9 or 9.5 ring.
- Something to cut copper pipe. I use a pipe cutting tool, but a hacksaw would probably work.
- Something to remove sharp edges. Sandpaper, a file, or a dremel should work.
- Something to polish the ring. You could try several grades of very fine steel wool, or fine sandpaper, followed by a polishing cloth, or a dremel.
Step 2: Cut the ring
I cut two rings to 1/4" width and one to 3/4"
Step 3: Remove sharp edges
I tried 3 different bits on my dremel trying to find one that worked. In retrospect, a simple metal file might have worked better, especially as it can get difficult to hold a ring while grinding at it with a 20,000 RPM tool grinding at it fruitlessly. I ended up using a sanding band attachment, which took a good whack at it. A grinding stone was worthless, and a sanding disk was not up to this task.
Make sure to grind not only the inside, but also outside edges. One can still be cut by the part fo the ring away from the finger.