no, what he does is form a part slowly with the Jog controls, and watches the part. Since as the part is formed, it is under the load it needs to be at to make the part as he wants it. I.e. if it needs more or less he turns the jog wheel more or less for that axis (upto 2 at once). He doesnt have to calculate deflection etc. since he is making the part then. So when the machine makes it, it moves to the same points he pushed it to, and thus will be under the same load for the same part. He claims that from part to part, the tolorance between them is +/- 0.0002".
To me that is amazing, I personally dont know sqaut about spinning or the science/skill behind it, I just did the control for the machine.
scott