This is a part for "CanBot", a can-crushing device we agreed to make as part of a sponsorship for the robotics team. It's a Geneva mechanism, which turns rotary motion into intermittent rotary motion, and I machined it in aluminum on my little CNC mill.
I'm pretty happy with the mill. It's really capable. I also got the 4th axis up and running around this time, although I haven't made anything with it yet.
Here's the device in action.