I started with some aluminum cans
and cut the rim off the can
Then cut the side off the can creating a strip of metal
The stip inserts into the disc cutter and with a heavy blow from a brass hammer (orange hammer on side) the disc is created.
Here are disc created in different sizes using 2 colors of cns.
The strip created with the can the way it started
Several disc cut from the strip
Sometimes I get a little close to the edge and the strip gets stuck
This isn't the only shape I work with of course.
Here are some finished earrings.