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## Main Question or Discussion Point

i have to design a double reduction gear drive using a spur gear pair.Input RPM is 730 and output RPM is 85.7. s The pinion teeth are 18 and the module is 3. The problem is that the input torque is 144Nm due to which i am getting a very high tangential velocity (Ft) which results in a higher values of bending stress both for pinion and gear and the values for my bending strength are comparatively lower to the bending stress so i am getting a factor of safety that is below 0. The steel i am using to calculate bending strength is AISI 1050 tensile strength 725 MPa.

Can anyone advise me what changes should i make to get a higher value of bending strength.

Can anyone advise me what changes should i make to get a higher value of bending strength.