A gear-reduction unit uses the countershaft depicted in the figure. Find the two bearing reactions. The bearings are to be angular-contact ball bearings, having a desired life of 50 kh when used at 300 rev/min. Use 1.2 for the application factor and a reliability goal for the bearing pair of 0.96.

Select the bearings from Table11€“2.

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16 14 25° 12 240 lbf 20° Gear 3, 24 dia. "С Gear 4, 12 dia.