Evaluation of Surface Roughness of Wood using Various Parameters
The surface roughness of wood is depend on
both wood cellular structures and processing,
and one parameter can not represent all the
characteristics of the wood surface. So,
we should choose suitable parameters for
the purpose of roughness evaluation.
The arithmetical mean deviation of the profiles
(Ra75) of wood specimen whose surfaces were processed
by four kinds of processing changed roughly
in accordance with the tactile roughness,
especially when Ra75 was measured at a larger cut-off (Fig.1).
The frequency power spectra of the profiles
had characteristic differences among the
wood species and machining processes, especially
in the wavelength range under 0.25mm (Fig.2).
On the other hand, there were some cases
where a couple of specimens of different
tactile roughness did not show any significant
differences either in Ra75 or in frequency spectra. It was suggested
that these differences in the tactile roughness
could be characterized by the skewness and
the kurtosis of the amplitude distribution
of the profile (Fig.3).
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