PROBLEMS

$16-1$ The figure shows an internal rim$-$type brake having an inside rim diameter of $300$ mm and a dimension $R=125mm.$ The shoes have a face width of $40$ mm and are both actuated by a force of $2\mathrm{.}2$ kN $.$ The drum rotates clockwise. The mean coefficient of friction is $0\mathrm{.}28.$

$($a$)$ Find the maximum pressure and indicate the shoe on which it occurs.

$($b$)$ Estimate the braking torque effected by each shoe, and find the total braking torque.

$($c$)$ Estimate the resulting hinge$-$pin reactions.

$16-2$ For the brake in Problem $16-1,$ consider the pin and actuator locations to be the same. However, instead of $120,$ let the friction surface of the brake shoes be $90$ and centrally located. Find the maximum pressure and the total braking torque. Do $16-2$ please.