Effect of waviness and roughness components on transverse profiles of turned surfaces

This paper presents the authors method of simultaneous analysis of roughness and waviness irregularity components, with the aim of better defining the key qualities and characteristics.Periodical surface machining traces may be analyzed spectrally, with the irregularity’s peaks and troughs being used to define the wave’s amplitude.In this work the standard composition for filtering waviness and roughness components of a surface is utilised.The method of digitally measuring the irregularity frequency ranges for the purposes of their spectral analysis is first presented. These results are then used to match the frequency ranges with the main irregularity components.A cumulative amplitude spectrum comprising both irregularity components is proposed to establish the relative contributions of the two components in the frequency spectrum.Comparative assessment of the error contributions from the form, waviness and surface roughness components gives a more complete image of the analysed surface topography. This also enables simultaneous evaluation of these components in different frequency spectra of the surface’s geometrical structure.

► A new and novel proposal for the co-assessment of waviness and roughness.
► Wide-band spectral analysis of components of unfiltered profile.
► Amplitude distribution of profile by percent in bands of waviness and roughness.