:)Most of the people face the problem to export the animation from maya to Unreal.Here you can find the answer.Inthis video tutorial i have shown how to rig the robot then export the animation from maya to unreal.i also shown how to import the animation into Unreal. I Simply rig the Robot with Joints and i did not used any constraint or IK.
After Watch this tutorial you will learn the method of exporting the animation for maya and importing into unreal Engine.this is very simple technique but very useful. Click here for tutorial