Hello VK, You've got some complex motions going on. Consequently, you need to have key framing that is a little more specialized. To create the motion, the object hotpoint needs to be completely at one end. After the 180 degree rotation takes place the hotpoint needs to be moved to the far end in order for the object to rotate around it.(I just manually rotated the object first one way, then the other using the shift key to constraining it to perfect rotations) The lines that you see highlighted in yellow need to have their Tweeners set to Discreet. Good Luck! Mark