Row tool balance and bow correction apparatus

Details Row tool balance and bow correction apparatus Row tool balance and bow correction apparatus

1995-01-27

1997-04-15

Meislin, D. S.

Abrading

Precision device or process - or with condition responsive...

Computer controlled

2960309, B24B 4900

Patent

active

056203560

ABSTRACT:
A magnetic resistive head lapping system is disclosed herein which incorporates an automatic applied force lapping fixture for row tool balance and bow correction. The fixture is mounted over a rotatable lapping plate and is effective to present a row tool or slider bar with magnetic heads deposited thereon to the abrasive surface of the lapping plate in proper orientation during batch fabrication of the magnetic heads. The fixture includes a stationary assembly and a movable assembly on which the row tool and slider bar are carried. A pair of electromagnetic actuators on the stationary assembly correct for balance while three electromagnetic coils on the movable assembly correct for row tool bow. A closed loop control system employs multiplexed lapping signals derived from electrical lapping guides or resistors carried on the slider to calculate forces required to correct for row tool balance and bow which are then introduced to the electromagnetic actuators for adjusting the row tool bending moments and for moving the movable assembly in relation to the lapping plate.

REFERENCES:
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patent: 4689877 (1987-09-01), Church
patent: 4912883 (1990-04-01), Chang et al.
patent: 4914868 (1990-04-01), Church et al.
patent: 5095613 (1992-03-01), Hussinger et al.
patent: 5203119 (1993-04-01), Cole
patent: 5463805 (1995-11-01), Mowry et al.

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