Abstract
The relation between the finishing grade of the metal surface and its friction was studied. The results obtained are:
(1) By Aluminum, copper and silver the surface friction decreases by increase of surface smoothness; the s_??_-called bearing materials as Al-Sn alloy, Cu-Pb alloy and cast iron do not take, a high finishing than the grade of the shaft.
(2) The friction curve of the silver surface is reverse to the curve of cast iron, (Fig. 1).
(3) Vertical sliding to the finishing direction is more comfortable than the parallel sliding in all metals and alloys.
(4) The surface preparation of copper, aluminium, silver and iron is not effec_??_ive, but is important on the ductile materials as bearing alloys.
