Project for Design II - MENG 475 Design of the Spur Gear Train The spur gearbox is illustrated in Figure below. Analyze the design of each gearset using the AGMA method. Given: The geometry and properties of each element are known. A 0.5 hp 1725 rpm electric motor at 95% efficiency delivers 0.475 hp to the 85 mm diameter drum. The maximum capacity of the crane is P 3 kN. All gears have -20° pressure angle. Shafts 1 or 2, 3, and 4 are supported by 12, 19, and 25 mm bore flanged bearings, respectively. Cover Gear housing Gear 6 Flanged bearing 25 mm bore Gear 4 Output shaft 4 Flanged bearing 19 mm bore Shaft 3 Shalt 2 Gear 5 Gear 3- Gear 2 Gear 1 Input shaft 1 12 mm OD x6 mm ID hp. 1725 rpm Flanged bearing 12 mm bore Assumptions: 1. The pinions are grade (1 or 2) steel with a hardness of 180 Brinell tooth surface and nitrided through-hardened steel. Gears are through-hardened steel, with 140 Bhn steel. 2. All gears and pinions are precision enclosed; manufacturing quality number (8-10) 3. Loads are applied at highest point of single-tooth contact 4. Assume a pinion life of 10' cycles and a reliability of 0.90. The tooth profile is uncrowned-crowned. Module m(mm) Number of Teeth N Pitch Diameter d(mm) Face Width b(mm) Gear 1 (pinion) 1.3 15 20 14 Gear 2 1.3 60 80 14 Gear 3 (pinion) 1.6 18 30 20 Gear 4 1.6 72 120 20 Gear 5 (pinion) 2.5 15 37.5 32 Gear 6 2.5 60 150 32