Metal deforming – With use of control means energized in response to activator... – Sensing tool or tool-linked part
Patent
1996-05-31
1997-11-18
Larson, Lowell A.
Metal deforming
With use of control means energized in response to activator...
Sensing tool or tool-linked part
723421, 148510, B21D 712
Patent
active
056875975
ABSTRACT:
A system for adjusting the gram load of a suspension with a high degree of accuracy and repeatability includes a clamp, load-engaging member, actuator, laser and control system. The mounting region of a suspension to be adjusted is releasably received and clamped by the clamp. A load beam of the suspension is engaged and supported at adjust positions with respect to the clamp by the load beam-engaging member. The load beam-engaging member is driven and positioned by the actuator. IR light from the laser is directed to the spring region of the suspension by optical fibers. The control system includes a pre-adjust input terminal, memory and a controller. Information representative of a measured pre-adjust fly height gram load value of the suspension is received at the pre-adjust input terminal. Gram load adjust data representative of load beam adjust positions which will cause the suspension W have a desired post-adjust fly height gram load value after the load beam is stressed relieved is stored in the memory. The controller is coupled to the pre-adjust input terminal, actuator, laser and memory, and controls the system by: 1) accessing the memory as a function of the measured pre-adjust fly height gram load value to determine the load beat adjust position which will cause the suspension to have the desired fly height gram load value after the load beam is stressed relieved, 2) actuating the actuator and causing the load beam-engaging member to position the load beam at the adjust position, 3) actuating the laser to stress relieve the spring region of the load beam while the load beam is positioned at the adjust position, and 4) actuating the actuator and causing the load beam-engaging member to release the load beam after the load beam is stress relieved.
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Harrison et al., The Double Dimple Magnetic Recording Head Suspension and Its Effect on Fly Height Variability, Journal of Tribology, 94-Trib-39, pp. 1-5.
Hotaling, Measuring Flying Height in an Era of Near-Contact Recording, Data Storage, Mar. 1996, pp. 41-46.
Hutchinson Technology Incorporated
Larson Lowell A.
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