New user here with V27. I am working on a simple 2-1/2 D encoder wheel. I want to mill this from 1/4" stock and create a central hub with the encoder slotted disk milled down to .1" Here is what the part looks like superimposed in the stock:

Attachment 253512

What I'd like to do is a milling operation with a 1/4" end mill that removes the material outside of the larger central circle to create what would look like a boss in this first operation:

Attachment 253514

Ideally, I'd like to spiral in from the outside to remove all that waste material but any solution would be fine. I tried a few things but they all resulted in a "slot" cut around the central circle. I could draw concentric circles and mill each one of those but that's a brute force approach. Any suggestions?

cheers,
Michael