Surface roughness is the shape error of the microscopic surface of the part. Its size and shape characteristics have a great influence on the performance of mechanical parts. For many years, people are looking for more reasonable and faster measurement and evaluation methods. After the implementation of the new standard, most of them require the measurement of the R_0 value and increase the width requirement. In most units, the light-cutting microscope and the interference microscope are still playing an active role, and the light-cutting method is difficult to find the least-squares center line. I use the regression analysis method to calculate the center line and draw the contour curve to get a variety of Parameter value.
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