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Surface Roughness Testing - tesatool.com
Surface Roughness Testing Surface Roughness Testing J-1. Surface Roughness Testing Summary of Roughness Application of Roughness Parameters Commonly Used Comparison Specimens Arithmetical mean deviation of the For a long time, these specimens for Testing the profile Ra Surface finish quality have proven their value in (ISO 4287, DIN 4768) practical use. The arithmetical mean deviation of the profile They serve for touch and/or sight comparisons Ra is the mean value of the absolute value of with the Surface of the workpieces that are the profile departure y within the reference manufactured using the same method. length l. Condition is that materials have to be compa- rable. Max. profile valley depth Rmax The comparison of the Roughness of the work- (DIN 4768). piece Surface is not quantitatively expressed. The max. profile valley depth Rmax is the largest The extent to which the surfaces of both the of the existing single Roughness depths Zi in the specimen and the workpiece are matched is total measuring length lm.
RUGOTEST Roughness Comparison Specimens For touch and/or sight comparisons with the surface of workpieces J-3 –Sets of roughness comparison specimens
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