Change in micro slant edge profile and a lubrication characteristic of parallel sliders during running-in condition are investigated. Grooved ring on flat ring tests in various running-in conditions were conducted to evaluate the change in bearing profile, wear depth and frictional properties. It is found that the height of the micro slant edge increases with increasing in running-in time. In addition, a sliders with microgrooves(MG) parallel to a sliding direction is employed in order to investigate surface roughness effect. From the experimental results, it is found that the friction coefficient of the sliders with the MG decreases although higher slant edge can be generated rather than that of a slider with isotropic roughness.
