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Browse Prior Art Database

Calibrated Asperity Disk

IP.com Disclosure Number: IPCOM000049946D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Broome, RW: AUTHOR

Abstract

A technique is provided to produce a bump or asperity of a known height on a magnetic recording disk for use in glide height testing. The technique involves drilling and tapping partially through a disk to produce a bump asperity on the opposite surface of the disk. The disk may or may not be coated with a magnetic recording material at the time the asperity is produced.

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Calibrated Asperity Disk

A technique is provided to produce a bump or asperity of a known height on a magnetic recording disk for use in glide height testing. The technique involves drilling and tapping partially through a disk to produce a bump asperity on the opposite surface of the disk. The disk may or may not be coated with a magnetic recording material at the time the asperity is produced.

In the first step, a tap drill is used to make a hole in the disk member. This opening is sized and finished with a much smaller drill so that the opening extends almost to the other surface of the disk. Then a special tap is inserted in the opening, and using an interference microscope to examine the surface, the special tap is rotated to cause the surface to bulge a predetermined amount to produce an asperity of the desired height. This is in contrast to prior techniques in which an asperity was produced and then its height was measured.

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