3. A gear-reduction unit uses the countershaft depicted in the figure below. NOTE: For this problem, use a maximum force

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3 A Gear Reduction Unit Uses The Countershaft Depicted In The Figure Below Note For This Problem Use A Maximum Force 1 (38.99 KiB) Viewed 26 times

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 K₁ = 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 20⁰ Canr 2