How to find the factor of safety at critical locations (gears, bearings, keys, shoulders, snap rings) on shaft having two gears mounted on it by using soderberg criteria? Gear diameter first gear 3.2 inch, second gear diameter 6", torque is 2300lbf-in, horse power 45, RPM 1200, gear ratio 2.4, Diametrical pitch 8, there are two snap rings to hold each gear means total 4 snap rings, two keys, two bearings at end, 2 shoulders to support bearings and 2 snap rings to support bearings, lets assume other values for diameters and distances in inches? Note: design the bearings, keys and gears so that factor of safety lies between 2-7?