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… the upper swash plate of an ultra-precise spindle on a circularity (roundness) measurement device typically has a 10%-15% spherical section providing a focal point above the plate's surface that serves as its functional primary datum while a pair of tensioned jack-screws provide adjustment for two of the unconstrained rotations while the third remains unconstrained... the air bearing spindle.The spherical portion of the part is inadequate for a datum, as any datum radius must have more than 180° to be used as a datum.