We proposed a new method of roughness evaluation of machined surface of hardwood regardless of its cellular structure, in which specified deep valleys were excluded from roughness profiles.
|Erasure of deep valleys from roughness profile|
Certain areas whch contain a valley deeper than the threshold and their adjacent data in roughness prifle were excluded from the calculation of roughness parameters and replaced by 0 (zero).
Roughness parameters were calculated from the areas which is NOT excluded.
|Relationship between surface roughness and grit number of coated abrasives|
|Wood surfaces of Japanese oak(Quercus mongolica var. grosseserrata) were sanded by coated abrasives from P80-P400
, and then one series of them were painted
with poly-urethane based paint and the other
Primary profiles were measured by stylus method and then roughness profiles were obtained by using the Gaussian desital filter with cut-off value 2.5mm.
Surface roughness of Ra, Ry, S, Sm were calculated from the roughness profiles.
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