Browse Prior Art Database

Disk Pack Balancing

IP.com Disclosure Number: IPCOM000035197D
Original Publication Date: 1989-Jun-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hatchett, MR: AUTHOR [+5]

Abstract

Disk file products currently achieve balancing in various ways, e.g., addition of self-adhesive lead weights, addition of tungsten carbide balls, removal of metal, addition of metal-filled epoxy. All of the above are performed on the spindle hub itself which is a small radius relative to the major out-of-balance force of the disks themselves.

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Disk Pack Balancing

Disk file products currently achieve balancing in various ways, e.g., addition of self-adhesive lead weights, addition of tungsten carbide balls, removal of metal, addition of metal-filled epoxy. All of the above are performed on the spindle hub itself which is a small radius relative to the major out-of-balance force of the disks themselves.

Because of space constraints, the need for even finer balancing at both ends of the pack, the need to minimize the type of materials used and low cost, the following method is used. In the method, the out-of- balance position is located using the normal balance measuring techniques which allows the mass and radius of the counterbalance required to be computed for a selected surface. A metered amount of viscous adhesive is applied to a disk non-active surface at the correct radius to give accurate counterbalancing. The adhesive is then locally cured.

After curing, the out of balance is again measured and balancing repeated if the desired accuracy has not been reached. If large out- of-balance forces are experienced, the adhesive can be loaded to increase the mass per volume ratio.

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