TECHNICAL DATA Excerpts from JIS B 0031 SURFACE ROUGHNESS ...
Position of Auxiliary Symbols for Surface Symbols An auxiliary symbol indicating a surface roughness value, cut-off value or reference length, machining method, grain direction, surface undulation, etc. is placed around the surface symbol as shown in Fig. 1. Fig. 1 Positions of Auxiliary Symbols a: Ra value b: Machining method c: Cutoff value・Evaluation length c´: Reference length・Evaluat
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