Here is the diagram.... Note: If the plate was the only object in the universe how could you claim it was spinning on it own axis?!.....oh the observer.....well then we must acknowledge the fact that we must consider other objects in our frame of reference/ universe to determine if any motion including rotation exist or not......the molecules in the plate do not rotate wrt each other....and the axis in which all molecules rotate around is the center of the plate ..there are no billions of billions of axis and rotations for each molecule they only have motion wrt the same thing the center of the plate has which is the observer. Thus the only axis of rotation is the Center molecule if you extend the axis beyond that it would encompass all those billions of molecules but it does not give them each their own individual axis upon which to rotate! there is only one axis whether you consider the axis as mathematical line ( having no dimensions) or as having the diameter of the plate itself the net effect is the same ..only one axis not billions!
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