G02 or G03 With a cnc mill and a small woodriftkey cutter If you have a cnc mill a lot of the hard become simple With a manual mill start with the tool at the size of the bore and centered, X&Y each direction to get some clearance for the tool then set the cutter larger and repeat after about three times you can go to X0Y0 and advance the tool out a little each time and get a round grove The shorter the shank on the tool the better.
Or second op in a lathe .
Good Luck Kevin


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