AT POINTS A AND B$,$ ARE LOCATED BEARINGS THAT SOMEHOW FIX THE SHAFT.

FIX THE SHAFT. AT POINT $($B$)$ AND $($C$)$ THERE ARE PULLEYS OF DIAMETERS $($DB$=16")$ AND $($DC$=12").$

THE OBSERVED FORCES ACT ON THE SURFACE OF THE PULLEYS AND REPRESENT THE BELT TENSIONS.

REPRESENT THE BELT TENSIONS. THE SHAFT WILL BE MADE IN A CAST IRON OF

ASTM STEEL GRADE $25$ USING A DESIGN FACTOR nd$=3\mathrm{.}0....$

WHAT DIAMETER SHOULD BE USED FOR THE shaft