5.1. Deviation from spherical form: the radial distance between the minimum external sphere and the maximum inner tangent concentric with the least squares ball.
Note: 1. Generally, the waviness is evaluated with the speed amplitude.
2. In fact, the waviness can be separated from the ideal surface by the analyzer (filter).
5.3. Surface roughness: the surface irregularity with a relatively smaller space, which normally includes the irregularity affected by the processing method and other factors.
Note: these irregularities are considered within a range of general definitions, such as the range of sampling length.
5.4. Surface defects: actual surface of a irregular body or group of irregular bodies caused unintentional or accidental during processing, storage, transshipment or using.