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Metrology

Starrett Introduces Unique Chordal Height Gage for Aerospace Application

Allows for rapid in-process verification of parts

Published: Monday, June 13, 2022 - 12:01

(L.S. Starrett Co.: Athol, MA) -- L.S. Starrett Co., a leading global manufacturer of precision measuring tools and gages, metrology systems, and more, has introduced a custom designed and manufactured Chordal Height Gage (a.k.a. DO Gage) to be used for measuring the opening heights of turbine vanes at specific locations to verify that an aircraft engine will get proper airflow. 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 made gage. So, Starrett’s special gage division designs and builds dimensional measuring instruments that provide guaranteed performance to meet customer specifications.

“Generally, to take turbine area flow measurements, an operator must take the nozzle off the production line and bring it to an automated inspection machine, such as a CMM. However, the special Chordal Height Gage allows for rapid in-process verification of these parts, eliminating time lost on additional teardown and setup of machinery,” says Kyle Webber, Starrett special gage division engineer.

The size of the Chordal Height Gage is determined based on the specific application it will be used on. The new gage is no larger than a tissue box. Despite the small footprint of the gage, it has three independent probes to take measurements, including a free-floating central gage body that allows the middle probe to take accurate readings along the trailing edge, regardless of the variable contours often found on these nozzles.

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

For more information on Starrett Special Gages, email specialgage@starrett.com.

About The L.S. Starrett Co.

Founded in 1880 and headquartered in Athol, MA, L.S. Starrett Co. is a leading global manufacturer of precision measuring tools and gages, optical comparators and vision systems, and force and hardness testing solutions. Starrett also manufactures laser measurement systems, custom engineered granite solutions, custom gauging, band saw blades, power tool accessory saw blades, workshop tools, and jobsite tools. The company has six manufacturing locations in the United States, including facilities in Massachusetts, North Carolina, Georgia, Ohio, Minnesota, and California. Starrett also has three international manufacturing facilities, with plants in Brazil, Scotland, and China, and distribution centers and offices worldwide. The L.S. Starrett Co. is publicly traded on the NYSE, symbol SCX.

For more information, contact L.S. Starrett Co.; email general@starrett.com

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