Zee,
What you need is an index head to go with your milling attachment. You will also need a sacraficial face plate....good news is you can make them yourself.
Does your milling attachment look like this?
http://www.littlemachineshop.com/products/product_view.php?ProductID=1681&category=1
If so you need an Atlas style indexer. I have the plans for that beast somewhere, I will dig them up and send them to you. Here's the idea/sketch
The Sacraficial faceplate is just that, sacraficial!...you will make it from a piece of 6" round aluminum. You can get that at Metal Express all cut to length. It has a 3/4" diameter spindle that can be a piece of TGP mild steel. You can get that from them also.
Here's the basic idea at a part routing.....
After blueing up with a good sharpy marker and carefully laying the stator out
1 through drill the plates and tap drill the faceplate. Mount the plates to the faceplate at the 4 corners and using the indexer, drill for the tap drill for the 6 bolts. Clearance drill the plates for the screw size, and then tap the holes in the faceplate. Put in the 6 bolts into the faceplate. You could just lay this job out and do it on the drill press. The chordal distance between the 6 holes is equal to the radius of the bolt circle. If you raise a burr between the plates after the drilling you will need to disassemble them and debur before you go on.
2. bore the 3" hole.....you can cut part way into the faceplate. Start with a drill and bore it out with a boring bar. I put a reduced diameter on the faceplate so that you could chuck it up easily in the 4 jaw......you can do it in a 3 jaw, but not as accurately.
You should get the 4 jaw anyways.
3. Set the faceplate and its spindle in the index block, and pick up on the bolt holes for angular location and center on the 3" bore..
4. Raise the milling attachment up by the width of the "tongue" and prepare to mill the slots to the mark out line. Mill the slots by indexing the faceplate.
5. Use the Bogstandard technique for turning round slugs to turn the OD. This of course after you take the corner bolts out.
CAN SOMEBODY dig that article up?
6. You will end up with the colored little triangles at the bottom of the slots. I would with the equipment you have just file them to the line carefully.. I think trying to do circular milling with this arrangelment is far to dangerous. It will get away from you.
To file this accurately, you will need to make a pair of filing guides. They are made in the lathe. When you get that far, I'll show you.
