Piney,
Where did you find that picture ? My guess from the castings behind that fella and the massive turn buckles that hold that fixture down and the gantry crane that setup was to true up those castings. It looks like he is truing up that wheel. Heck as big as it is even if it was only spinning at 50 rpm the surface speed would be outrageous fast.
**********Just Saying*******************************Gator*********************************
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