A bright shiny jet engine interior with a good surface texture tested with ASME B46.1-2019 requirements.
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ASME B46.1-2019: Surface Texture (Roughness, Waviness, Lay)

For living things and much of nature, imperfections are distinguished. With manufactured products, however, imperfections are less celebrated, as some can compromise performance. ASME B46.1-2019:…