roughness average (Ra)
[/ˈrʌfnəs ˈævərɪdʒ/ (R-A)]
noun
rugosidade média (Ra)
1. A standard measurement of surface roughness defined as the arithmetic mean of the absolute values of the profile heights over a measured length, expressed in micrometers (µm) or microinches (µin)
The Ra value of 0.8 µm indicates a relatively smooth machined surface suitable for precision applications.
O valor de Ra de 0,8 µm indica uma superfície usinada relativamente lisa adequada para aplicações de precisão.
2. A key parameter in surface finish specification used in engineering and manufacturing to ensure product quality and functionality
Engineers specified an Ra of 1.6 µm for the bearing surfaces to ensure proper lubrication and minimal wear.
Os engenheiros especificaram um Ra de 1,6 µm para as superfícies de rolamento a fim de garantir lubrificação adequada e desgaste mínimo.
3. The most commonly used roughness parameter in ISO 4287 and ASME B46.1 standards for surface texture measurement
Ra is preferred over other roughness parameters because it provides a single numerical representation of overall surface texture.
Ra é preferido em relação a outros parâmetros de rugosidade porque fornece uma representação numérica única da textura geral da superfície.
Roughness Average (Ra) is a universal technical term used in manufacturing, mechanical engineering, and quality control. It originated from international standardization efforts (ISO 4287) and is equally important in Brazilian, Portuguese, American, and global manufacturing industries. Understanding Ra specifications is essential for engineers and quality technicians working in precision manufacturing sectors such as automotive, aerospace, medical devices, and machinery production.
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