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Starrett Introduce Turbine Vanes Chordal Height Gage

Starrett has introduced the Chordal Height Gage (a.k.a. DO Gage) is designed to be used for measuring the opening heights of turbine vanes at specific locations to verify that an aircraft engine will get the correct air flow. The new Chordal Height Gage is part of the Starrett line of special area flow gages. Even with the availability of hundreds of standard precision tools and gages, sometimes measuring challenges are best solved with a specially designed gages, so the Starrett Special Gage Division designs and builds dimensional measuring instruments that provide guaranteed performance to meet customer specifications.

The size of the Chordal Height Gage is determined based on the specific application it will be used on. Despite the small footprint of the gage, it has three independent probes which are used to take measurements, including a free-floating central gage body which allows the middle probe to take accurate readings along the trailing edge, regardless of the variable contours which are often on these nozzles.

The gage is built in a ‘Lazy-L’ shape to enable linear readings to be taken perpendicular to the trailing edge of the blades, giving a dimension for the smallest opening that air can flow through. These features help contribute to the accuracy and repeatability of the Chordal Height Gage, which is within 0.0005 inch, although the indicator readouts are generally set to a 0.001 inch resolution per customer requirements.

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