There was a pretty good paper published awhile back in the World Academy of Science, Engineering and Technology 18 2008. It described several different modeling methods.
Here's a link to the paper.
Are you using Inventor 10 or are you really using Inventor 2010?
This cylindrical cam tutorial (there is a Cylindrical Cam tool directly in later releases of Inventor) along with the previously posted link might get you started to a solution. Attach your file and cam specifications here if you get stuck.
This is a more general method that might be adaptable to your need rather than the built in tool in later releases.
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