RA value, Surface Finish,
Surface roughness testing,
there are many different roughness parameters in use, but Ra is by far the most common, though this is often for historical reasons and not for particular merit, as the early roughness meters could only measure Ra. Other common parameters include Rz, Rq, and Rsk. Some parameters are used only in certain industries or within certain countries. is during Inspection of surface finishing. We check surface finishing with the help of RA meter.
As we get the RA value we compare it in chart to check Grit finish. What ever we want like 180 grit or 220 grit.
Mechanical engineering.
fabrication .
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