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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Conversion of roughness

Hi, can you help me finding the conversion from absolute surface roughness (sand roughness)to Ra.

Best regards,

Christian Holt
- Frederiksberg, Denmark

Hello Christian!

Try a search of this site using "surface roughness" or "surface finish", to get to a number of letters wherein your question has already been asked, and occasionally answered.

Good luck!

Lee Gearhart
metallurgist - E. Aurora, New York

What does the word absolute mean. If you are talking about conversion of RA to RMS/Rq then I think I can help you. Rather, this is not an easy answer, because there is a variable here, that can be anywhere from 1.11 to 2.10:1. I suggest you take a look at an article at a website called www.qualitymag.com or www.predev.com/

AF Kenton
retired business owner - Hatboro, Pennsylvania

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