In the following problems, it is assumed that the bearing has but one row of balls. A work...

In the following problems, it is assumed that the bearing has but one row of balls. A working year will be taken as 250 days.

If a 309 bearing is installed at the left reaction in Fig. 1, find the rating life at 8 hours per day. Speed is 450 rpm and the bearing is subjected to light shock. Inner rings are pressed on the shaft; outer rings have free fits.

Figure 1