Sperry Corporation

Tsu F Chen

Edwin R Phillips

Juan M Gottschalk

A drilling monitor employs laser optics and an associated signal processing device to provide intelligent control capable of making the optimum decision to maintain hole quality and maximize drill life during the drilling of via holes in a circuit board. Twist angle, bending and temperature of the drill are monitored and the drill motor and/or the board is controlled accordingly in response to present data being compared to preprogrammed acceptable standardized data.

Drilling monitor

Apparatus is provided for imposing measurable wear on the surface of a magnetic recording disk and for determining the relationship of read/write characteristics due to such wear. A dynamic air bearing separates the interface between the disk surface and a slider head. The imposed wear changes the relationship between the head and disk and the changes provide measurable data for experimental evaluation of read/write slider flying dynamics.

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Dresher, PA, United States of America

Tsu F Chen