Abstract: A cartridge or motor which includes a shaft with a thrust plate at one end; the counterplate which lies across the end of the shaft is welded to an extension of the sleeve in which the counterplate is fit.

Abstract: A hydrodynamic bearing having a shaft relatively rotatable with rest to a surrounding sleeve and having a thrust plate of or near one end thereof. The shaft and sleeve define a journal bearing extending substantially the full length of the two relatively rotating parts.

Abstract: A method of fabricating a spindle hub assembly (90) including precision machining critical surfaces of the hub components (60, 33) that mount onto a spindle shaft (30) and accurately locate the critical surfaces for positioning of bearing cones (35, 36) on the shaft in spaced relationship of bearing seats (34) on the hub (60, 33) to ensure stable rotation of the hub on the shaft.

Abstract: A bimetallic part is formed from metals or comprises metals with different thermal expansion coefficients. A first element defines the part and defines one surface of the bearing gap and has a first coefficient of expansion and a second element is wholly or partially inserted into and constrained within the first element and having a different coefficient of thermal expansion so that as the temperature changes, the stress created by the differential expansion of the two elements will cause the overall part to deform elastically as a function of temperature. This deformation will cause the gap, the elements being properly selected, to narrow as temperature rises (and viscosity falls) and to widen as temperature falls (and viscosity rises).