Table 1.

Variables of the sandpaper used in experiments

Type of sandpaper
VariablesP60P120P280*P400*P0*12 μm
Mean diameter (μm)26912552.2±2.035.0±1.518.3±1.012
Roughness Ra (μm)--8.4647.9995.9962.408
F/W from experiments3822261930.9
  • Values are means ± S.D. *N=10; roughness data obtained from supplier.

    F/W, force ratio (see Fig. 7).