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Browse Prior Art Database

Aerosol Relubrication of Disk Files

IP.com Disclosure Number: IPCOM000037624D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Yeack Scranton, CE: AUTHOR [+2]

Abstract

Disk file failures are attributed to depletion of lubricant film thickness or deterioration of lubricant films during disk file operation. Two methods are described here for depositing lubricant films by introducing an aerosol of solvent droplets, e.g., Freon, with a small percentage of lubricant in a carrier gas, such as air, into the Head Disk Assembly (HDA).

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This is the abbreviated version, containing approximately 69% of the total text.

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Aerosol Relubrication of Disk Files

Disk file failures are attributed to depletion of lubricant film thickness or deterioration of lubricant films during disk file operation. Two methods are described here for depositing lubricant films by introducing an aerosol of solvent droplets, e.g., Freon, with a small percentage of lubricant in a carrier gas, such as air, into the Head Disk Assembly (HDA).

In method one, the file is stopped or rotated at a speed below the take-off speed of the head. A metered amount of solvent/lubricant mixture is nebulized into a fog and injected into the HDA. Through diffusion, convection and mixing, the fog is dispensed throughout the HDA in a time short compared to the settle- out time of the droplets on the disk surface. After a suitable waiting period, external air flow is used to evaporate the solvent leaving lubricant on the disk surface. Any tendency to dewet, which can cause a head crash, can be avoided by wiping the active disk surface with a slow spiral sweep of the head.

In method two the lubricant is introduced as an aerosol of droplets, smaller than the head flying height, while the file is running. Lubricant application can be continuous on in metered bursts. If a solvent is used to form fog droplets it will evaporate before reaching the disk surface. Air shear and head passage distribute the lubricant on the disk surface. Routinely randomly seeking each actuator ensures that every part of a disk surface has an occasional h...