The AB shaft shown in the figure rotates at 120 rpm and carries a torsional moment of T=1920 Nm. The scale circle diameters of the B and C chains are respectively; 160 mm and 240 mm.

a) Find the reaction forces of F, P, and the bearings by drawing the free-body diagram of the AD shaft.

b) Find the equivalent medium and amplitude stresses on the critical section of the shaft AD.

c) Shaft material is made of AISI 1144 steel (C_ut=646 MPa S_y=358 MPa) AD Dimensions are given for the spindle. All surfaces on the shaft are polished and rounding is given as r / d = 0.1 at all stages. Find the Safety Factor of AD spindle for infinite life at 99% reliability.

y 80 mm A B P KQ 65 mm 100 mm 250 mm C KQ55 F 120 mm- 350 mm D x Z P 160 mm a a 240 mm F