The shaft shown in Fig. 7-25a is supported by the collar at C, which is attached to the shaft and located on the right side of the bearing at B. Determine the largest value of P for the axial forces at E and F so that the bearing stress on the collar does not exceed an allowable stress of (\sigma _(b))_(allow )=75MPa and the average normal stress in the shaft does not exceed an allowable stress of (\sigma _(t))_(allow )=55MPa.