has anybody

StrokerScamp said

Yes, I have seen it on a crank grinder before. That's why you see machine shops store cranks either hanging in racks or standing upright on the floor. Brake rotors have been known to warp on the shelf if they are stored for long periods. Same kinda thing.

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When I worked for High Performance Parts Outlet we always hung are Crankshafts...I do the same or I leave them in the block,for storing purposes...
On the brake rotors. every time we replace customer brake rotors with new,we machine them first and you would be surprised how many are warped out of the box...