I'll just cite a book by Dr. Michie Kaku. It's called [u]Physics of the Impossible[/u], in his book he has 3 impossibility classes, 1, 2 and 3. 1 being things we may have by the end of the century; 2 being things we may have in a few hundred years; and 3 being things that as we know it, violate the laws of physics and are, for now, literally impossible. A perpetual motion machine is a class 3 impossibility. Eventually, due to friction on the joint/rotation point, your machine will stop. How long it would take I don't know but it will eventually stop. Also what are you powering with it? One of the reasons for trying to make a perpetual motion machine is so you can endlessly power something. So once again, the energy transfer from your machine to whatever you are powering will eventually stop it. Energy will be lost in friction, and bc of the friction, heat as well.