Other

United Technologies Corporation

Christopher D Mize

John C Ziegert

Peter T Vercellone

William W Pirsig

A ball bar gage for obtaining the accuracy of numerical control machines and the like including telescoping means integrated with an interferometer and the method of measuring the distances between two locations including an initialization process that ascertains the absolute length of the distance being measured from the differential changes in length measured by the interferometer and a computer that calculates by a trilateration computation 2 or 3 dimensional coordinates by computing the measurements obtained by the ball bar gage. A laser beam or other light source are contemplated to energize the interferometer. Similar calculations are performed with the ball bar gage and computer over a number of spatial locations commensurate with determining the accuracy of the machine being evaluated.

Measurement instrument with interferometer and method

A buffer zone disposed between the TOBI (tangential on-board injector) discharge cavity and the forward rotor cavity of a gas turbine engine serves to maintain the TOBI air relatively pollutant free by judiciously controlling the flow to maintain the pressure of the buffer cavity below the adjacent cavities. The buffer cavity air and the forward rotor cavity air are bled to the dead rim area of the turbine rotor disk through tangentially oriented discharge ports formed in the circumferentially spaced plenums formed in the stator support. Plates on the bottom of some of the plenums block off the flow from the forward rotor cavity and buffer air from the buffer cavity flows through these closed of plenums to maintain the proper pressure relationship amongst the cavities.

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Palm Beach Gardens, FL, United States of America

Christopher D Mize