I am a manufacturing engineering student. I had learnt how to measure the surface roughness of a surface few years ago. But recently, when I conduct an analysis on the surface roughness, I just realise that the surface roughness tester that I usually use can be used to measure only flat surface. When the surface roughness tester is used to measure the circular surface, it measures only the top point it can touch because it move horizontally.
I am wonder what kind of device can be used to measure the surface roughness of circular surface.
The ordinary tester you use can not measure roughness of spherical surfaces. You may need another tester. For example:
If you mean a circular surface and not spherical; you may place the tester such that it moves along the axis of the cylindrical body.
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