finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

HomeFAQsBooksHelpWantedAdvertiseForum
topic 9267

Ra - roughness clarification


(2001)

Can someone explain exactly what is being measured in an Ra surface roughness spec. Is it an average of the peak to valley heights over the measured surface?

John Cianciolo
- Salem, New Hampshire, USA


(2001)

The Ra is an average of the peaks an valleys of a surface finish. The difference in the highest peak and lowest valley is commonly referred to as the Rmax.

Daryl Spindler
- Nashville, Tennessee


(2001)

John-

To add to Daryl's answer, I'd refer you to www.predev.com/smg/parameters.htm where there is a nice explanation of all those pesky lookalike surface roughness parameters.

Good luck!

lee gearhart
Lee Gearhart
metallurgist




This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.