Is Shaking & NoiseDuring KneadingNormal?

Yes, slight shaking and low humming noise are completely normal, as the motordrives the kneading blade.
If you experience severe shaking or loud, unusual noise, it's likely due to:
Uneven dough: A hard, dense dough from incorrect ingredient ratios putsextra strain on the motor.
Unstable placement: The machine is not sitting on a flat, level surface. 
Blade misinstallation: The kneading paddle is not locked into placeproperly.