2 x 4 inch lumber scraps (2 x 2 inch or similar also works)
drill bit gauge
fine toothed scroll saw blades (varies with gauge of wire used, but something like 40 - 60 tpi should work - thinner kerf is better)
metal rod to use as a ring mandrel - I used 1/4 inch metal rod and 3/16 inch brass rod
non-ferrous metal for making rings - I used 17 ga. aluminum wire for electric horse fencing - $22 for 1/4 mile spool of wire.
drill press or hand drill
drill driver to help speed up coiling the wire
small wood dowels or skewers the same size as the coil mandrels.
Wire of your choice: Any non-ferrous (no iron or steel) wire should work, but test a small sample before you coil up tons of rings.
Standard SAFETY warning: be careful when using sharp tools and power tools.
Step 1: Wrapping the wire coils
There are many ways to get wire coils, you can find lots of ideas online. Here's a summary:
1. Hand wind wire around a rod of the desired size - you can use metal rods, metal hole punches, plastic pen barrels, knitting needles etc. Wood dowels and skeweres don't work that well because tightly wound wire can crush the wood and get stuck on the dowel.
2. Hand wind wire on a crank style mandrel - this is easier on your wrists.
3. Insert rod into the check of a and electric screw driver or drill. Wear gloves to protect your hands and guide wire onto the slowly spinning mandrel. Use scrap lumber with a hole drilled in one end to support one (or both) ends of the mandrel as it spins. My son has strong hands and loves to use the cordless drill driver to wrap coils - I like to hand wind coils.