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

-----

Metal surface finish

I am General Manager of Freedom Machining, Inc. located in Anderson SC.

We have a spec. on a print that requires 1.6 Ra , what is this value in RMS?

Jerry Linne
CNC Machine Shop - Anderson, South Carolina
2005

2005

Jerry,

Ra x 40 = RMS
1,6 x 40 = 64
so the value in RMS=64

Klaas de Boer
- Derustit, Holland

There is no precise conversion possible from Ra to RMS, since they are two entirely different measurements. However, assuming a pure sine wave shape, the conversion would be Ra x 1.1 = RMS. This is probably close enough for most purposes.

Jeffrey Holmes, CEF
Spartanburg, South Carolina
2005

(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: