1. Identical 200K series Timken ball bearings are to be used with the shaft below. There...

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1. Identical 200K series Timken ball bearings are to be used with the shaft below. There is no axial load on the shaft. The shaft rotates at 1300 rpm. Medium impact is expected, so an appropriate (middle of the recommended range) load application factor should be used. Good quality grease is used for lubrication, so a lubrication life application factor of 0.79 should be included. A reliability of 95.5% is required. What is the expected life of bearing A in (a) 10" revolutions and (b) hours? What is the expected life of bearing C in (c) 10% revolutions and (d) hours? (e) What is the expected life of bearing A in hours if a 300K bearing with the same bore is substituted for the original 200K bearing? F=25kN 70 mm 100 mm A 300 mm B Answers (a) LDA (rev) (b) LD,A (hours) (c) LD,c (rev) (d) LD,c (hours) (e) LD,A-300K (hours) 1. Identical 200K series Timken ball bearings are to be used with the shaft below. There is no axial load on the shaft. The shaft rotates at 1300 rpm. Medium impact is expected, so an appropriate (middle of the recommended range) load application factor should be used. Good quality grease is used for lubrication, so a lubrication life application factor of 0.79 should be included. A reliability of 95.5% is required. What is the expected life of bearing A in (a) 10" revolutions and (b) hours? What is the expected life of bearing C in (c) 10% revolutions and (d) hours? (e) What is the expected life of bearing A in hours if a 300K bearing with the same bore is substituted for the original 200K bearing? F=25kN 70 mm 100 mm A 300 mm B Answers (a) LDA (rev) (b) LD,A (hours) (c) LD,c (rev) (d) LD,c (hours) (e) LD,A-300K (hours)