I am looking for a decent easy to use but not limited 3D Mod program that can program to move.....

I am looking for a decent easy to use but not limited 3D Mod program that can program to move.. i.e. moving conveyor parts w/ shaker screens, that material moving into a pile and say a loader piking up said material.. If you or anyone else has any ideas on what I might be liiking for please email me a cmorris@horsehead.net Thank you for your time..