Spindle for centering a data disk

A centering device for centering a disk hub about a spindle comprising, a spindle extension member having mounting means for connection to the free end of a spindle about which a disk hub is to be mounted, the extension member having an interrupted circumferential slot with a U-shaped cross section, the open end of the U facing upwardly, and the slot defining at least one upright finger from the base of the U extending upwardly, the base of the U fixed integrally with the spindle extension member, said finger having a radially outwardly facing peripheral surface with a face portion at the upper tip of the finger extending radially outwardly further than the base for snug contact with the inside diameter of a disk hub, whereby said finger will be compressed radially inwardly by the face portion contacting the hub, centering the hub on the spindle.

A centering spindle for centering a disk hub comprising, a spindle made of a stiff material having an axis of rotation with a lower driven end for connection to a motor and an upward free end over which an annular disk hub is placed, with the inside diameter of the hub snugly fitting over the spindle, the free end of the spindle having a triangular cross section, with triangular apexes having face portions extending radially outwardly further than the spindle lower end and integral with the spindle, and shaped to nest in snug contact with the inside diameter of a disk hub, said triangular cross section having generally equal triangular sides, at least one of said face portions having means for radially compressing so that said hub is centered on said spindle.