Fig. 1
From: Mid-spatial frequency error generation mechanisms and prevention strategies for the grinding process
(a) False-colour plot of a tactile surface measurement of a sample, ground on a grinding machine SPM 140, with tool rotation 2971 1/min and sample rotation 50 1/min, path distance 0.05 mm; (b) False-colour plot of a tactile surface measurement of a sample, ground on a grinding machine SPM 140, with tool rotation 2971 1/min and path speed 5000 mm/min, path distance 0.05 mm. The first four Zernike coefficients were subtracted from both measurements. Machines, tools and substrate were used as described in Experiments section