Abstract
The microscopic gloss of turned surfaces is experimentally studied on nonperiodic turned scratches. The turned surface is illuminated along the cutting direction at the incident angle of 60° and observed with a microscope from right above the surface. Because the visual field of the microscope is dark, the same periodic turned streaks as the feed of lathe can not be found but only nonperiodic turned scratches are observed in the field. After taking the microscopic photographs of the nonperiodic turned scratches, the density distribution of the photographic films are recorded with a microphotometer. The mean distance between adjoining peaks p, the mean height of peaks h and the mean depth of valley bottoms l are obtained through the photographic density curve respectively. S= 250/p defines a visual power in which the distribution density of nonperiodic turned scratches is taken into account, while R=log(h/l) is a quantity relating to the size of the scratch. The microscopic gloss of a turned surface is expressed by a point on the S-R coordinate plane. In white iridescent surfaces, S is within the range from 9 500 to 14 000 and R is within the range from 0.025 to 0.060.
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