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topic 38459

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



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
Jeffrey Holmes, CEF
      South Carolina

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