Abstract: A biasing tool with a main body portion, for biasing a disc relative to a central axis of rotation of a motor hub by steps for biasing the disc adjacent the motor hub. The biasing tool includes; a first and second biasing finger each having a protruding disc engagement region, each biasing finger extending from the main body portion, and an attachment aperture confined within the main body portion accommodating alignment of the biasing tool relative to the disc. The steps include selectively engaging the disc with a disc engagement region of the first or second biasing finger, and aligning a center of rotation of an annular servo track written on the disc with the central axis of rotation of the motor hub by biasing the disc adjacent the motor hub, which forms a common rotational axis for the motor hub and the annular servo track.

Abstract: A biasing tool with a main body portion, for biasing a disc relative to a central axis of rotation of a motor hub by steps for biasing the disc adjacent the motor hub. The biasing tool includes; a first and second biasing finger each having a protruding disc engagement region, each biasing finger extending from the main body portion, and an attachment aperture confined within the main body portion accommodating alignment of the biasing tool relative to the disc. The steps include selectively engaging the disc with a disc engagement region of the first or second biasing finger, and aligning a center of rotation of an annular servo track written on the disc with the central axis of rotation of the motor hub by biasing the disc adjacent the motor hub, which forms a common rotational axis for the motor hub and the annular servo track.

Abstract: A tolerance ring which provides a low consistent installation force profile as a rotatable member, such as a disc drive actuator, is installed onto a stationary member, such as a shaft extending along an axis. The tolerance ring has a substantially cylindrical base portion from which a plurality of spaced apart raised portions radially extend. Each raised portion has a contact surface with a substantially elliptical cross-sectional shape in a direction parallel to the axis and a pair of transition portions between the contact surface and the base portion. Each transition portion further has a continually radiused cross-sectional shape in a direction parallel to the axis so that, for each raised portion, a selected one of the elliptical cross-sectional shapes and the pair of radiused cross-sectional shapes is convex with respect to the axis and the remaining one of the elliptical cross-sectional shapes and the pair of radiused cross-sectional shapes is concave with respect to the axis.

Abstract: A tolerance ring is disclosed which provides increased hoop strength and resistance to deformation. The tolerance ring is placed on a stationary post so as to circumferentially extend about an outer surface of the post. An actuator assembly with an inner bored recess is thereafter placed onto the post so that the tolerance ring is compressed between the surface of the inner bored recess and the outer surface of the post, thereby maintaining a desired nominal position of the actuator assembly about the actuator pivot axis. The mechanical configuration of the tolerance ring includes a substantially cylindrical base portion from which at least one brace portion and a plurality of contact portions project. The brace portion preferably extends along the circumference of the base portion and preferably comprises either a circumferentially extending ridge or flange.