a$)$ Draw a free$-$body diagram of the entire crankset and find the reactions at the ball bearings and the force from the

chain. $($Hint: find the chain force first from a cleverly chosen moment balance equation.$)$

b$)$ Find the maximum normal stress and shear stress at cross section $x-x($in the spindle just outside the ball bearing$)$ and

indicate the locations on the given cross$-$section view where they act.

c$)$ Find the maximum normal stress and shear stress at cross section X$-$X $($in the spindle just outside the ball bearing$)$ and

indicate the locations on the given cross$-$section view where they act.