@AlanRail posted:Two programs Coreldraw and Rhino. Skills in both are an outgrow of mechanical drafting that goes back to high school.
That answer my question! Sadly, I don't have any 3D CAD experience from anywhere. 
When I was working in Aerospace, many of our instruments had very intricate gear trains to drive multiple pointers. I marveled at how the mechanical guys would get all that stuff working. It made my electronic design and programming tasks look pretty mundane. 
