Abstract
Effect of contamination of tobacco to cutting fluid on surface roughness has been investigated in finish turning of P/M aluminum alloy and wrought pure aluminum. Tobacco deteriorates the surface finish, so that the experiential knowledge in machining work shops is confirmed. The harmfulness of tobacco appears clearer at good finishing conditions. The deterioration in surface roughness depends on concentration of some tobacco component (s) exuded into cutting fluid; surface roughness is not influenced below a threshold concentration and the deterioration in surface roughness shows saturation at high concentrations. The adverse effect of contamination of tobacco to cutting fluid on surface roughness can be recovered by removing the harmful tobacco component (s) from the fluid by active carbon.
