Two Methods of Measuring Surface Roughness

comparative method

It is used for on-site measurement in the workshop, and is often used for the measurement of medium or rough surfaces. The method is to compare the measured surface with a roughness sample marked with a certain value to determine the measured surface roughness value.

stylus

Surface roughness Use a diamond stylus with a radius of curvature of approximately 2 microns to slide slowly along the surface to be tested. The up and down displacement of the diamond stylus is converted into an electrical signal by an electrical length sensor.

After amplification, filtering and calculation, it is indicated by the display instrument. The surface roughness value can be obtained, and the Recorder can also record the profile curve of the measured section.

Generally, a measuring tool that can only display surface roughness values is called a surface roughness measuring instrument, and a measuring tool that can record a surface profile curve is called a surface roughness profiler.

These two measurement tools have electronic calculation circuits or electronic computers, which can automatically calculate the arithmetic mean deviation Ra of the contour, the microscopic roughness of the ten-point height Rz, the maximum height Ry of the contour and many other parameters, which have high measurement efficiency and are suitable for The surface roughness of Ra is measured at 0.025~6.3 microns.