[Mi...] Posted August 15, 2018 Share Posted August 15, 2018 Had an engineer ask me a question that I don't have an answer for. Ra surface finish requirements have always been (at least at this facility) 8, 16, 32, 64, 125, 250. Is there a standard for this or has the "scratch and sniff" standard comparator plates become a stone tablet? Link to comment Share on other sites More sharing options...
[An...] Posted August 15, 2018 Share Posted August 15, 2018 It doesn't seem to be a standard as there are several exceptions, so more or less a rule of thumb. I asked a few engineers here and none of them had a clear cut answer, most of them said they thought it was probably for conversion purposes. Others said someone probably looked in a handbook and saw it as a reference and it just kind of stuck. I was flipping through my Machinery's Handbook and all the ISO standards related to surface finish don't specify. I hope someone can shed some more light on this subject. Link to comment Share on other sites More sharing options...
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