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Sensors 2017, 17(3), 652;

A Fast Measuring Method for the Inner Diameter of Coaxial Holes

State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
Author to whom correspondence should be addressed.
Academic Editors: Thierry Bosch, Aleksandar D. Rakić and Santiago Royo
Received: 16 January 2017 / Revised: 9 March 2017 / Accepted: 17 March 2017 / Published: 22 March 2017
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A new method for fast diameter measurement of coaxial holes is studied. The paper describes a multi-layer measuring rod that installs a single laser displacement sensor (LDS) on each layer. This method is easy to implement by rotating the measuring rod, and immune from detecting the measuring rod’s rotation angles, so all diameters of coaxial holes can be calculated by sensors’ values. While revolving, the changing angles of each sensor’s laser beams are approximately equal in the rod’s radial direction so that the over-determined nonlinear equations of multi-layer holes for fitting circles can be established. The mathematical model of the measuring rod is established, all parameters that affect the accuracy of measurement are analyzed and simulated. In the experiment, the validity of the method is verified, the inner diameter measuring precision of 28 μm is achieved by 20 μm linearity LDS. The measuring rod has advantages of convenient operation and easy manufacture, according to the actual diameters of coaxial holes, and also the varying number of holes, LDS’s mounting location can be adjusted for different parts. It is convenient for rapid diameter measurement in industrial use. View Full-Text
Keywords: inner diameter; coaxial holes; measuring rod; laser displacement sensor inner diameter; coaxial holes; measuring rod; laser displacement sensor

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Wang, L.; Yang, F.; Fu, L.; Wang, Z.; Yang, T.; Liu, C. A Fast Measuring Method for the Inner Diameter of Coaxial Holes. Sensors 2017, 17, 652.

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