Spindle motor for reduced size disk drive and method of making s

Details Spindle motor for reduced size disk drive and method of making s Spindle motor for reduced size disk drive and method of making s

1990-06-28

1993-01-19

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

G11B 1702

Patent

active

051811480

ABSTRACT:
A spindle motor for two and one-half inch disks and three and one-half inch disks has a disk mounting surface with a horizontal tolerance of less than 30 micro inch to prevent warpage of a disk mounted thereon by pressure engagement. The disk mounting surface is machined to the requisite tolerance by mounting an assembled motor on a support surface of a rigid granite block table and spinning the rotor of the motor by an external drive. A cutting tool then machines the disk mounting surface.

REFERENCES:
patent: 4519010 (1985-05-01), Elsaesser
patent: 5031061 (1991-07-01), Hatch

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