Sample Size Analysis for the Measurement of Straightness

Abstract

Surface quality is important in manufacturing industries, especially in machine part manufacturing. Straightness precision and accuracy come into the limelight because it is also included in the surface quality category. Straightness measurement is a way to check unevenness in the surface and see how precisely straight a surface is. Evaluating straightness can depict tested product surfaces by collecting point clouds data. Collecting more point clouds data can represent the surface of the product precisely, but it consumed more time and cost. On the other hand, collecting a few point clouds data to measure cannot give enough information to represent product surface and the measurement will be not valid. The main goal of this paper is to verify how strong the sample size of measured points can affect the measured value, also search what sample size of data is enough to represent the property of the measured surface.