Electricity: measuring and testing – Magnetic – Magnetic test structure elements
Patent
1997-12-02
2000-07-25
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetic test structure elements
360 9901, 360 9907, 360 9801, 360 9807, G11B 1702, G11B 1708, G11B 1704
Patent
active
060940476
ABSTRACT:
An apparatus for balancing the spinstand of a magnetic head and disk testing system includes a base that rotationally supports a rotating spindle. The spindle supports a pack of disks and a slide moveable along guide rails of the spinstand. The slide, in turn, supports a stack of magnetic heads that is moveable in respect to the pack of disks. The spindle supports a balancing cap that has a plurality of threaded openings uniformly spaced in its peripheral surface. Imbalance is adjusted by threading screws into or out of the selected threaded openings. The value of imbalance is defined by vibration measurements; these measurements are performed by means of an accelerometer attached to the spindle housing, and of a rotary encoder that generates index pulse in a certain position of the spindle. In order to provide reliable measurements by means of the accelerometer, the spindle housing either can be fixed to test magnetic heads, or can be turned to a spring-loaded condition to increase sensitivity of the balancing procedure. Each time the disk pack is replaced, the system measures the amount of radial displacement of the screws in respective openings that is necessary to compensate the imbalance created by the new disk pack. The proposed balancing method includes manual or automated calibration procedure, automatic vibration measurements, and manual adjustment of the positions of screws in the balancing cap using the results of measurements.
REFERENCES:
patent: 5254946 (1993-10-01), Guzik
patent: 5382887 (1995-01-01), Guzik et al.
patent: 5537272 (1996-07-01), Kazmierczak et al.
Bokchtein Ilia M.
Guzik Nahum
Guzik Technical Enterprises
Snow Walter E.
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