Find the R ratio for this cyclic loading

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The shaft shown in the figure is machined from AISI 1030 CD steel. The shaft rotates at a constant RPM and is supported by roller bearings at A and B. The profile keyway at F has static stress concentration factor of Ktb = 2.312 for bending. The applied forces at gears C, D and F are in the same plane as the bearing reactions and remain constant. a) b) Clearly draw and label shear and bending diagrams for the shaft. Determine the factor of safety against bending fatigue only at location F (centerline of Gear F) assuming 50% reliability and state in words if the shaft will have infinite life based on this location. T 1.500 1.25 Ø- BEARING 1.160 A E 4.5 0.375 & GEAR C 500 lbf C -1.75 Ø 3.0 & GEAR F 300 lbf FV -0.75 2.5 BEARING -0.50 0.0312 R- B 2.5 3/8 x 3/8 PROFILE KEYWAY -0.375 GEAR D 1.5625 KEYWAY DETAIL AT "F" 450 lbf D 1/4 x 1/4 PROFILE KEYWAY -1.25 Ø

Need help on all questions. Please include all units, steps to the problem and information such as its direction or if it is in compression or tension. Thx.