The Difference Between Ra and Rz - Production Machining
https://www.productionmachining.com/articles/the-difference-between-ra-and-rz
Apr 07, 2015 · Rz averages only the five highest peaks and the five deepest valleys — therefore, extremes have a much greater influence on the final value.” According to doctor blades manufacturer Swedev’s website, “Ra is the arithmetical average value of all absolute distances of the roughness profile from the center line within the measuring length.
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