Was going to do a tut on this pathing but I am having trouble with periodic crashes so decided to do a step by step pictorial instead.
Here are some videos followed by the pictorial.
Pathing the ring PART 1
Pathing the Ring PART2
Cutting the ring PART1
Cutting the ring PART2
Cutting the ring PART3
1: Setup huge wax block
2: Check X old fashioned way ;)
3: Run the roughing paths with a 3.17 EM
4: Cut the hole for Brant's arbor.
5: Start indexing path, this one includes all blockers in place and is low res at 0.05mm stepover.
6: Hide the side panel blocker and go in at 0.02 stepover
7: Cut the indexed taper ball areas at about 50 degrees
REPEAT 5-7 at A180
8: Use paint to check that detail is ok before removing from mill.
9:Rotary phase1 , full cut at low res 0.05mm Blockers back in place.
10: which will be followed by three index's at 290 - 0 - 70.
11: Time to decore that sucker
12: and get some sleep...