Thanks for the responses, guys. It's not the part finish I'm worried about. If you look very closely at the round surface edge at the top of the part and the profile curve around the part, you'll see that there is a lip where the ball mill did the roughing but did not do a finish contour.
This is a ruled surface so it should be straight from boundry to boundry--ie: you should be able to lay a straight-edge across it with no deviation. In the photo, you can see a small cupped edge on both boundries. That's the problem.
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Greg |