Research on the inspection method of large-scale plane straightness

YANG Bi-bo, ZHAO Wen-hong,  ZHAO Rong, LOU Yi-bing
（MOE Key Laboratory of Mechanical Manufacture and Automation, Zhejiang University of Technology,
Hangzhou 310014, China）

Abstract: Aiming at the problem of large-scale plane straightness measurement, a method based on three-point method was proposed. On the basis of the method, the structural, parameters and the type of displacement sensor were determined, and MSP430F149 microcontroller which was used to capture pulse signal was chosen to complete the design of measuring instrument. To evaluating the straightness, least squares method principle was used to process those collected datas. The results indicate that the measuring instrument meets the requirements of straightness measurement accuracy of automated processing. And it provides a selection of measuring instruments for flat extrusion dies polishing automation technology.
Key words: large-scale; straightness; three-point method; MSP430F149; least squares method