K ING F AHD U NIVERSITY OF P ETROLEUM & M INERALS Mechanical Engineering Dept. Machine Design II: ME308 – Semester 132 Homework # 7 Assigned: April 27, 2014 Due: May 4, 2014 Problem 1:The figure shows two long shoes in an internal expanding heavy duty rim brake. The drum has a 460-mm diameter. Each hinge pin supports a single shoe. The shoe face width is 200 mm and the hinges are 445 mm from each other. The actuating force W, which is applied at 265 mm from the hinge, makes an angle of 20° with the horizontal plane.The actuating mechanism is arranged to give the same actuating force W. 1.Select a suitable braking material 2.Find the actuating force W. 3.Find the braking capacity of the full system.