International Business Machines Corporation

Nicholas Frank Ciminello

David L Schmoke

Uldis Artis Ziemins

Ray A Reyes

Edward Sherwood

A method, system and test fixture for allowing testing and calibration of various operation parameters of an overhead traveling vehicle (hereinafter 'OTV') are disclosed. The invention implements a test fixture that includes a rotatable bearing set for rotatably engaging a wheel of the OTV such that the wheel can rotate but the OTV remains stationary. The bearing set is held in a raised position, similar to the operational position of the OTV, by a raised support. The test fixture may also include a reflective tape for use with an optical sensor(s) of the OTV. In this fashion, operation parameters of the OTV such as drive servomotor velocity, current gain, current offset, OTV travel profile, optical sensor op-amp gain, etc., can be tested and calibrated.

Overhead traveling vehicle testing and calibration

A reticle SMIF pod includes a dome having a plurality of latchkeys and a cassette having a plurality of primary engagement locations thereon into which the latchkeys are intended to engage when sealing the cassette to the dome. A plurality of secondary engagement locations are positioned in the cassette above the plurality of primary engagement locations to prevent the cassette from falling should the plurality of latchkeys fail to engage in the primary engagement locations.

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White Plains, NY, United States of America

Nicholas Frank Ciminello