Hi I have a new question. I need to calculate shaft strenght. the configuration is shaft with two self align bearings and a pulley in the midlle. Loads are radial 26 kN and torgue 200Nm the radial load have constant direction, the torgue change direction (spining is reversed) Now the question: is the shaft static loaded or i have to consider and calculate for fatigue failure ?? I am using Ivertor design calculator will do and FEA analysis. The main thing is i have to choose safety factor which is different for the two types of loading I hope it makes sense.