The output shaft of a 120 Watt electric motor has a 20°full-depth steel spur pinion with 20 teeth and a module of 2.5 mmdriving a 36-tooth gear attached to an air blower. The pinion speedis 100 rpm. Both the pinion and gear are manufactured from grade 2steel using hobs shaping cutters, have a 18mm wide face,through-hardened steel at 200 Brinell, and are aligned in servicesuch that kH = 1.6. For a service life of 108 cycles, a reliabilityof 99%, determine the bending fatigue stress and the associatedfactor of safety
