Three parallel gears [img:c571663f6b]http://mw.concord.org/modeler1.3/mirror/mechanics/parallelgears.gif[/img:c571663f6b] [url]http://mw.concord.org/modeler1.3/mirror/mechanics/parallelgears.html[/url] Click the following link to launch the real model: [url]http://mw.concord.org/modeler1.3/mirror/mechanics/parallelgears.jnlp[/url]