Description – Roughness is the measure of the finer surface irregularities in the surface texture (texture comprises roughness, waviness, and form), either along a profile (line) or across a surface.
Form is a long spatial wavelength, or the overall “shape” of the surface. Waviness is a shorter spatial wavelength, such as an undulation in the shape. Roughness is the shortest spatial wavelength of the surface irregularities.
These surface irregularities are results of the manufacturing process employed to create the surface.
Roughness is measured, using a numerical parameter, which is a description of the overall roughness of the surface.
Roughness average (Ra), sometimes previously known as arithmetic average (AA) or (CLA), both now deprecated,, is the rated as then the is a parameter, calculated as the arithmetic mean deviation of the surface valleys and peaks. Units used are typically in micrometers or microinches.
Reference
https://www.engineersedge.com/surface_finish.htm
https://en.wikipedia.org/wiki/Surface_roughness
ASME B46.1.2019
Required Parameters
- Roughness – {Ra, Rq (RMS), Rv, Rp, Rz}
Optional Parameters
- StartPointX – Start Point on the X-Axis distance from the reference
- EndPointX – End Point on the X-Axis distance from the reference
- StartPointY – Start Point on the Y-Axis distance from the reference (for areal roughness only)
- EndPointY – End Point on the Y-Axis distance from the reference (for areal roughness only)
- Evaluation Method – ({Ra, Rq (RMS), Rv, Rp, Rz})
- Resolution – x-y distance between points
- Reference – DIN, ISO, ASTM, ASME, or Federal G-Series Measurement Specifications [plain text]
Measured Value & Uncertainty
- Roughness (m)