![]() 1) Numerical relationship between shape tolerance and dimensional tolerance ![]() The simplest reference value: the dimensional tolerance is 3-4 times the roughness, which is the most economical. ![]() When the shape tolerance is less than 25% of the dimensional tolerance (super high relative geometric accuracy), Ra ≤ 0.15Tf (shape tolerance value). When the shape tolerance is 25% of the dimensional tolerance (high relative geometric accuracy), Ra≤0.012IT When the shape tolerance is 40% of the dimensional tolerance (higher relative geometric accuracy), Ra≤0.025IT When the shape tolerance is 60% of the dimensional tolerance (medium relative geometric accuracy), Ra≤0.05IT In general, it is determined by the following relationship: Relationship between dimensional tolerances, geometric tolerances, surface roughness
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