Average Roughness Height Parameters Ra, Rq, "RMS"

Author:  Unknown
Source:  ABC, Vol 5/ No4, Fall 2000
Doc ID:  2000047
Year of Publication:  2000
Abstract:  
Editors Note: This article was passed on to us by Ronald Dickey. We couldn't trace the origins of the article - if you are the author or know who wrote it, please contact us. Ra = ARITHMETIC AVERAGE ROUGHNESS HEIGHT Ra is now the universally official symbol for the parameter that was formerly called AA in the United States and CLA in England. It's the one parameter that's standardized all over the world, and is specified and measured far more often than any other parameter. The "checkmark" symbol used on drawings to specify a surface texture control requirement is a Ra specification.