Importance

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Abstract

A workpiece having a generally cylindrical outer surface centered on an axis is machined by first closing a pair of journal halves having generally semicylindrical inner surfaces of slightly greater diameter than the outer workpiece surface around the workpiece. Then a fluid is pumped under superatmospheric pressure into the space between the journal inner surface and the workpiece outer surface so as to support the workpiece in the journal halves on the liquid generally out of contact with the inner surfaces thereof. The thus supported workpiece is rotated about its axis and a finishing tool is engaged radially against it. The average radial distance between the journal inner surface and workpiece outer surface when the journal halves are closed on the workpiece is equal to more than the sum of the radial deviations of these surfaces from a perfect cylinder. The workpiece is rotated by axially engaging it between a pair of rotatable elements and rotating at least one of the elements.

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First Claim