Abrading – Precision device or process - or with condition responsive... – Computer controlled
Patent
1996-07-01
1998-05-12
Rose, Robert A.
Abrading
Precision device or process - or with condition responsive...
Computer controlled
451 14, 451 57, 451272, 2960316, 2960312, B24B 3704
Patent
active
057497699
ABSTRACT:
A lapping method and device for lapping magnetic heads to provide an air bearing surface with improved surface quality including increased smoothness, reduced rolloff, and reduced recession. The lapping machine includes a lapping plate having a grinding surface, a linear motion mechanism for moving the ABS over the grinding surface in a first, linear direction, and a micro-advance mechanism for controllably advancing the workpiece over the grinding surface in a second direction that is preferably perpendicular. The lapping method comprises affixing the unfinished magnetic head proximate to the lapping plate and depositing an abrasive slurry on the grinding surface. An initial rough lapping stage is performed, including moving the grinding surface so that the workpiece is lapped to a first predetermined target specification. After washing, a conductive lubricant material is applied to the grinding surface, other lapping steps may be performed, and then a micro-advanced lapping stage is performed, including micro-advancing the magnetic head in the second direction while simultaneously linear lapping it in the first direction to provide a highly polished ABS.
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Church Mark A.
Desouches Alain Michel
International Business Machines - Corporation
Rose Robert A.
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