Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

Surface Roughness Conversions

I'm looking for a conversion table for surface roughness between Ra and Rz for common metal removal processes such as milling and turning. Any help would be greatly appreciated.

Joe Reames
- Charlotte, North Carolina
2000

Joe:

Go to this URL. I have found this site to be a good source for surface parameter info.

www.predev.com/smg/parameters.htm

Good Luck,

Bill Boatright
- Raleigh, North Carolina
2000

They are based on two different measuring criteria. So you can not convert one to the other like Ra to RMS. Ra is the average of all the peaks and valleys. Rz is the average of 5 of the highest peaks and 5 of the lowest valleys.

Todd Osmolski
- Charlotte, North Carolina, USA
2000

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: