Originally Posted by
dgrobe2112
i really hope this isnt an issue we all have to deal with.. seriously.. you would think that with a longer motor.. the bearings being farther apart.. that the load on the outer bearing would be more than if the shaft were shorter like in the pro4.
For a given side load generated at the pinion location of the motor shaft, the shorter the motor is, the more bearing load generated at both motor bearings. This is due to the moments that the side load produces along the length of the motor shaft, which requires a bearing load to counter act those moments.
The longer the motor is, the less the bearing load is on both bearings. For a given side load, as the motor increases in length, the bearing load on the bearing closest to the pinion will be equal to the side load, and the bearing load on the far bearing will be close to zero.
This assumes a steady side load is being applied and does not account for any dynamic effects.