The figure is a schematic drawing of a countershaft that supports two V-belt pulleys. The countershaft runs at 1500 rev/min and the bearings are to have a life of 60kh at a combined reliability of 0.98. The belt tension on the loose side of pulley A is 15 percent of the tension on the tight side.

Select deep-groove bearings from Table 11€“2 for use at O and E, using an application factor ofunity.

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300 45° 0 400 150 250 dia. 300 dia. 50 N 270 N