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Publication Citation: DIAMETER AND FORM MEASUREMENT OF A MICRO-HOLE IN A FUEL INJECTOR NOZZLE WITH THE NIST FIBER PROBE

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Author(s): Balasubramanian Muralikrishnan; Jack A. Stone Jr; John R. Stoup;
Title: DIAMETER AND FORM MEASUREMENT OF A MICRO-HOLE IN A FUEL INJECTOR NOZZLE WITH THE NIST FIBER PROBE
Published: November 02, 2009
Abstract: We discuss the measurement of diameter and form of micro-holes with reverse tapers in a fuel injector nozzle using an ultra-low force contact fiber probe on a CMM. The fiber probe was designed and built at the National Institute of Standards and Technology (NIST) and has demonstrated extremely low uncertainties (under 100 nm, k = 2) on high-quality artifacts. We present diameter and form data, and detail an uncertainty budget for the diameter. The dominant terms in the uncertainty budget are related to the poor surface finish and form of the part. Our uncertainty budget indicates that the diameter of a suitably clean micro-hole in a fuel nozzle can be determined to an uncertainty of 196 nm (k = 2) with our probing technique.
Conference: Proceedings of the Annual Meeting of the American Society for Precision Engineering, Monterey CA 2009
Proceedings: American Society for Precision Engineering, Annual Meeting 2009
Pages: 4 pp.
Location: Monterey, CA
Dates: October 6-8, 2009
Keywords: Fiber probe, Fuel injector nozzle, Micro-hole metrology
Research Areas: Dimensional Metrology
PDF version: PDF Document Click here to retrieve PDF version of paper (182KB)