[Grady Clay]

Chicken and egg dilemma.

I’ll speculate the taper attachment came loose from either the threaded end breaking off first or the nut just coming loose. During the “running loose” period, the bearing failed from the high vibration loads. When the bearing failed, the taper nose of the shaft completely failed.

Judging by the size of the components, I suspect the rotating mass must have been significant. Hopefully no one was injured.

Best,
Grady