Assignment 5 bearing and gear A pair of mating gears have 20 full-depth teeth with a diametral pitch of 8. Both gear and pinion are made of steel heat-treated to 350 Bhn, and both have a face width of 1.0 in. The teeth are cut with a top-quality hobbing operation. The pinon has 20 teeth and rotates 1100 rpm. It is mounted out board on the shaft of an electric motor and drives a 40-tooth gear that is positioned inboard on an accurately mounted blower shaft. The design life corresponds to 5 years of 60 hours/week, 50 weeks/year operation. Using a reliability of 99% and a safety factor of 1.5, a) estimate the horse power that can be transmitted, based on bending fatigue. b) Estimate the horse power that can be transmitted, based on surface durability. Schematic and Given Data: 1100 rpm Pinion: Np=20 Gear: N=40 + + Material: Steel, heat treated to 350 Bhn Standard full depth teeth Accurate mounting P=8 -=20 b=1 in. Design life: 5 yrs, 60 hr/wk, 50 wk/yr operation Top quality hobbing operation for manufacturing