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Conditioning of Diamond Tool for Lathe Turning of Aluminum Disk Substrates

IP.com Disclosure Number: IPCOM000104551D
Original Publication Date: 1993-May-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Coburn, JW: AUTHOR [+5]

Abstract

Diamond tool bits are used to generate a high quality surface finish on aluminum alloy substrates used in several IBM disk products. A major problem has been encountered with new diamond tool bits in that they tend to "pull out" small intermetallic clusters creating small pits which eventually cause magnetic defects. It is necessary to "condition" the tool bit by turning as many as 20 disks before the pullout rate drops to an acceptable level. It would be very desirable to condition the tool bits prior to their use on the lathe to avoid the time/cost of the conditioning procedure.

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Conditioning of Diamond Tool for Lathe Turning of Aluminum Disk Substrates

      Diamond tool bits are used to generate a high quality surface
finish on aluminum alloy substrates used in several IBM disk
products.  A major problem has been encountered with new diamond tool
bits in that they tend to "pull out" small intermetallic clusters
creating small pits which eventually cause magnetic defects.  It is
necessary to "condition" the tool bit by turning as many as 20 disks
before the pullout rate drops to an acceptable level.  It would be
very desirable to condition the tool bits prior to their use on the
lathe to avoid the time/cost of the conditioning procedure.

      It has been discovered that exposing the tool bits to energetic
ion bombardment by mounting them on the cathode of an argon rf glow
discharge is an effective method of conditioning the diamond tool
bits.  The argon ion bombardment sputters away the sharp edge
sufficiently allowing the tool bit to be used in disk manufacture
immediately, totally eliminating the previously required break-in
procedure.