Table 3.

Evolution of surface profiles and roughness Ra roughness of white and black granite as a function of grits (Vs = 2500 rpm; f = 1000 mm/min).

	White Granite	Black Granite
Grit 45	Ra = 6.460 µm	Ra = 5.089 µm
Grit 150	Ra = 3.100 µm	Ra = 2.885 µm
Grit 300	Ra = 1.999 µm	Ra = 2.705 µm
Grit 600	Ra = 0.414 µm	Ra = 0.522 µm
Grit 1500	Ra = 0.147 µm	Ra = 0.114 µm
Grit 3000	Ra = 0.076 µm	Ra = 0.096 µm