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specIAl GAGInG

turbIne coMpressor rotor spAcers turbIne noZZle dIApHrAGM
This inspection fixture checks gas turbine engine compressor rotor spacers for openInG GAGe
radial size and runout at five stages. This gage checks three critical dimensions in the nozzle.
It represents a specific Starrett special gage capability — the designing and This is an older and less complex design than the gage
building of large, ultra-precise fixture gages mounted on Starrett precision granite above, and it does not measure the radial height dimension.
surface plates which meet or exceed U.S. Federal Specification GGG-P-463C. Test Master segment
Special GaGinG

Gage on setting master

Inset: Rotor turns 360º on its axis to determine runout and radial deviation.

AerospAce
AREA FLOW GAGE
Area Flow Gages measure the minimum area openings of turbine engine nozzles. Area readings are in
.001 square inch resolution. It uses eight or more contacts that reach into the throat of the turbine nozzle
openings. The recorded measurements are transferred via hydraulic cylinders to a dial indicator. Using
mechanical linkage and hydraulics the algebraic area is transferred to the indicator or electronic probe at
the top of the gage. Openings of segments are matched and located opposite one another on the engine
circumference to provide a balanced air flow. These gages are custom designed for each stage of the
turbine and are critical to proper engine performance and operation.

A non-segmented nozzle

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