A band brake working on the back-stop principle is shown in Fig. 12.25(a). The width of friction lining perpendicular to the axis of the drum is 75 mm. In normal operating condition, the drum rotates in clockwise direction.
Calculate:
(i) the minimum value of coefficient of friction between the lining and the drum so that the brake acts as a back-stop brake.
(ii) If the normal pressure between the drum and the lining is to be limited to 0.3 N/mm², what could be the maximum braking torque?