in Inventor 2008, you will need to place a work point at the exact
center of gravity of your part. Later versions of Inventor allow you to
do this automatically.
Your best bet would be to go to:
http://cvaengineering.com/InventorAddIns.aspx Download iCOG
--
Dennis Jeffrey, Autodesk Inventor Certified Expert
Autodesk Manufacturing Implementation Certified Expert.
Instructor/Author/Sr. App Engr. Tel. (260) 399-6615
http://teknigroup.com