what's meaning of this sentence?

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today ,i saw this sentence"all plate edges shall be 500 R.M.S or less" this sentece appeared in plate preparation,i don't know what's meaning of it ,please interpret it thanks
Reply:In general, the R.M.S. is the root mean square.Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:It's a surface finish callout for the plate edges.
Reply:Googling it, turns up that it is a measure of surface roughness. Root-mean-square of the depth of the imperfections.This forum posting seems to know what's going on: http://www.engineersedge.com/wwwboard/posts/2754.htmlBe wary of The Numbers: Figures don't lie,. but liars can figure.Welders:2008 Lincoln 140 GMAW&FCAW2012 HF 165 'toy' GTAW&SMAW1970's Cobbled together O/A
Reply:Heres a surface gauge.http://www.mscdirect.com/product/details/06558019
Reply:thanks all
Reply:The STARRET brand is usually the best but I couldnt find them. The MSC surface gauge in the link above goes from 2 to 500. Your spec said less than 500 so the MSC RMS gauge should be fine for your 500 or less RMS call out.Last edited by Insaneride; 03-17-2016 at 10:52 AM.