Fig. 1 shows a speed reducer consisting of a two-stage, compound reverted gear train. All gears in the system are spur gears. a) Using a minimum factor of safety n = 1.2, determine the appropriate gears. For the chosen gears, show the values of number of teeth N, pitch diameter d, module m, pressure angle op, face width b, addendum a, dedendum bd, addendum circle diameter da, in a table. b) Design the shafts used in the gearbox and provide a gear layout by showing the dimensions. Project report: Your project report should include a cover page (with the title of the project and the course, your name(s), and date), description of the project, your calculations and assumptions (hand-writing is accepted for this section), and a conclusion. Table 1: Design requirements for the speed reducer Power to be delivered: 12 kW Input speed: 1500 rpm Output speed: 85-90 rev/min Usually low shock levels, occasional moderate shock Input and output shafts extend 100 mm outside gearbox x3 Maximum gearbox size: 350 mm x 350 mm base, 550 mm height Output shaft and input shaft in-line Gear life > 12 000 hours; infinite shaft life 2