I created a model in Inventor 2011 and I animated the machine using the IPN file. Everytime I create the animation, for some reason the rotational tweak randomly increases it's radius. The part is suppose to rotate on the axis i picked and all the parts are centered on that axis. The radius is 0" but Inventor changes that radius to 15" all on its own. what causes this rotation to become so wide on it's own?