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Japanese surface texture interpretation? 2

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Ceramicguy

Ceramicguy

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I have a Japanese drawing (I think) with a surface texture callout I don't understand. The symbol looks like a standard surface texture symbol allowing for material removal but has a alphanumeric code above the closed triangle of either 3S or 18S. Any ideas on a conversion to an Ra, Rz, Rt or similar? See the attachment for clarification of my description.

Bruce
 
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That is an old designation system from previous versions of JIS B 0601. It is indicating Rmax in micrometers.
 
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