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Method and apparatus for balancing rotating components of a spinstand of a magnetic head and disk tester
| Details |
Inventors: Guzik, Nahum; Bokchtein, Ilia M.;
Assignee: Guzik Technical Enterprises (San Jose, CA)
Primary Examiner: Snow; Walter E.
Assistant Examiner:
Attorney, Agent or Firm: Lappin & Kusmer LLP
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. |
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DETAILED DESCRIPTION The present invention is directed to a method and apparatus for balancing the spinstand of a magnetic head and disk testing system.
The apparatus comprises a disk support assembly which includes a spindle support coupled to a base member, a spindle which is rotatable with respect to said spindle support about an axis of rotation and a spindle driver for selectably driving the spindle to rotate about the axis of rotation.
The support assembly also includes a position indicator which generates a signal representative of the instantaneous angular position of the spindle with respect to the spindle support.
The apparatus further comprises at least one balancing assembly affixed to the spindle so that the balancing assembly is rotatable with the spindle about the axis of rotation.
Within the balancing assembly are a plurality of balancing weights, each weight being positioned along an associated radially directed path with respect to the axis of rotation.
The weights are adjustable along the paths so as to cancel the effects of an inherent imbalance in the spindle and disk pack assembly.
The apparatus also includes an accelerometer which generates a signal representative of radially directed acceleration of the spindle with respect to the base member, as a function of the angular position of said spindle about the axis of rotation.
The apparatus further includes a computational element which determines the spindle angular position corresponding to a maximum acceleration of said spindle, and calculates a set of compensating positions of the balancing weights so as to cancel the maximum acceleration.
In accordance with one preferred embodiment of the invention, the computational element averages the signal representative of acceleration at corresponding angular positions for at least two revolutions of said spindle.
In another embodiment, the invention includes a mechanism which automatically adjusts the balancing weights so as to conform to said compensating positions determined by the computation element
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