We use a free (and very good) 3D gaming, CAD and animation software called "Blender", we use it as our CAD software because PTC crashes on us to much for some odd reason, plus we know Blender and Python scripting better and we normally animate out CAD drawings. If you download it, you can transfer your CAD files into it then animate it. One of our team members has put up a bunch of tutorials up on youtube, here's a link if you want to start learning how to use it.
http://www.youtube.com/user/qazwsx2541 I hope that helped.