Please help solve
Posted: Fri Jul 01, 2022 6:41 am
Please help solve
3. A gear-reduction unit uses the countershaft depicted in the figure below. NOTE: For this problem, use a maximum force of 240 lbf and a minimum force of 120 lbf. Also, use AISI 1080 HR Steel and a shaft diameter of 0.5 inches. Use Kr- 1.15 and K=1.3. The bearings are to be angular-contact ball bearings, having a desired life of 50 kh when used at 300 rev/mm. Use 1.2 for the application factor and a reliability goal for the bearing pair of 0.96. Select the bearings from data in your text. All dimensions in inches. a) Find the factor of safety for the shaft. b) Find the two bearing reactions, and select the bearings.
240 lbf 20° lolo Gear 3, 24 dia. 16 A 14 Gear 4, 12 dia. B 12 oo 25°
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240 lbf 20° lolo Gear 3, 24 dia. 16 A 14 Gear 4, 12 dia. B 12 oo 25°