SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING Rotation Factor When the outer race rotates and the inner race is stationary(the reversal of common practice), the rated load may be increased by a factor of 1.2, since a ball rolls further per revolution on the outer race when the outer race rotates (the ball rotates in the same sense as the race) than on the inner race(where ball rotation is opposite to that of the race) and life is limited by ball revolutions Equivalent Dynamic Load a plain ball bearing is desi gned to take radial loads However. due to the curvature of the ball tracks in an axial plane of both inner and outer races, some axial load may be imposed on a radial ball bearing as well. Note that an axial load is taken by all balls, at least in theory, while a radial load is carried by less than half their numberSCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING Rotation Factor When the outer race rotates and the inner race is stationary (the reversal of common practice), the rated load may be increased by a factor of l.2, since a ball rolls further per revolution on the outer race when the outer race rotates (the ball rotates in the same sense as the race) than on the inner race (where ball rotation is opposite to that of the race), and life is limited by ball revolutions. Equivalent Dynamic Load A plain ball bearing is designed to take radial loads. However, due to the curvature of the ball tracks in an axial plane of both inner and outer races, some axial load may be imposed on a radial ball bearing as well. Note that an axial load is taken by all balls, at least in theory, while a radial load is carried by less than half their number