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Central Distance= 4” Service Conditions: 11-16 Hrs per day, No shock, Grease LubricationDesign for 14-½ pressure angleProcedure: a.Calculate the Overload Service Factor = .1.1+.4= 1.5b.Calculate the required Horsepower= 2x1.5 = 3HPc.Calculate the speed ratio = Driver/driven= (600/300)= 2:1d.Select the pitch and the least number of teeth for the driver and driven gear from the center distance and gear ratio combinations i.6 pitch, 16 driver, 32 drivenii.12 pitch, 32 driver, 64 drivene.Select pitch for the driver. Assume driver gear is the smaller gear. 8 pitchf.Select HP and gear type for the Driver and Driven gear (Verify that the HP got from the tables is greater than the required HP) i.Driver = 9.52 HP, 9.37 HP Driveng.Select the required driver and driven gears
i.Driver: NSS816, Driven: NSS832Post-Lab Exercise 1.Name any two gears in which the axis of the driver and the driven shaft area.Mutually perpendiculari.Mitre gear and worm gear b.Paralleli.Helical gears and spur gears2.How does an idler inserted between driving and driven gears effect the speed ratio? a.It doesn’t affect the speed or gear ratio, only the direction3.Why do you think helical gears run greater than spur gears? a.Helical gears run greater than spur gears because of the way the teeth are angled and because of the way that its angled, the gears are able to engagemore making them run greater.4.What is the difference between herringbone and double helical gears? a.A double helical gear has a gap while a herringbone doesn’t5.Define the following. A) Root Diameter, B) Backlash, C) Tooth Profile a.Root Diameter is the diameter at the base of the tooth space b.Backlash is the amount of play between the meshing teeth of two mating gearsc.Tooth Profile is the curving line created external to the side of the base circle.