Basic Components & Elements of Surface Topography

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Ra, Rq Parameters • Roughness average R a is the arithmetic average of the absolute values of the roughness profile ordinates. • Root mean square (RMS) roughness R q is the root mean square average of the roughness profile ordinates. 800-875-4243
R q – Root Mean Roughness R q is more sensitive to peaks and valleys then R a , because the amplitudes are squared. Applications • Very similar to R a , which practically replaced it for general use. • Used to control very fine surfaces in scientific measurements and statistical evaluations. 800-875-4243
Page 1 and 2: Basic Components & Elements of Surf
Page 3 and 4: Surface Profile Measurement Lengths
Page 5 and 6: Recommended Cutoffs for Different S
Page 7 and 8: R a = AA = CLA R q = RMS On majorit
Page 9: R a - Roughness Average Advantages
Page 13 and 14: R z - Mean Peak-to-Valley Height R
Page 15 and 16: R p and R pm • R p , per ISO 4287
Page 17 and 18: Bearing Length Ratio t p (R mr ) 80
Page 19 and 20: Different Methods of t p (R mr ) BA
Page 21 and 22: Pc (RPc), Nr HSC (RHSC) Application
Page 23 and 24: Waviness Height - W t Sum of the la
Page 25 and 26: Corresponding Parameters in Paramet
Page 27 and 28: R z to R a Conversion • BS 1134/1
Page 29 and 30: Different Methods of Designating R

Basic Components & Elements of Surface Topography

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