| 摘要 |
A workpiece (22) having a periphery is centered using a centering apparatus (20) having a workpiece spindle (24, 28) operable to rotate the workpiece (22) about a rotational axis (26), and a centering head (29). The centering head (29) includes a mount (30) movable in a movement direction lying in a plane (40) perpendicular to the rotational axis (26), and generally along a radial line (38) extending outwardly from the rotational axis (26). A swivel head (32) is pivotably supported on the mount (30) and is pivotable about a pivot axis (46) parallel to the rotational axis (26). The swivel head (32) has a pair of bearings (66) spaced apart along a direction lying generally perpendicular to the movement direction, with the bearing axis of each bearing (46) parallel to the rotational axis (26). A distance measuring device (34) is operable to measure the distance between the periphery of the workpiece (22) and a measurement location on the mount (30). The method includes mounting the workpiece (22) on the spindle (24, 28), positioning the centering head (29) at a location adjacent to the periphery (82) of the workpiece (22), rotating the spindle (24, 28) to rotate the workpiece (22), and measuring a runout curve using the distance measuring device (34). The centering head (29) is moved to contact the bearings (46) to the workpiece (22). The workpiece (22) is pushed with the bearings (46) in a direction and by an amount so as to reduce a constant term of the runout curve toward zero.
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