For an airgun project I had to make some small delrin washers.
The delrin was turned down to size and center drilled.
Then I drilled the ID to size.
I ground a thin (.032") parting tool that is not square at the front but tapered so as to generate less of a burr on the finished washer. I held it in the 1171 back toolpost.
The dowel pin captured the parted off washer as the parting tool is plunged into the work.