We started using 3-d design software about 3 years ago to help speed up the process of going from sketches and engineering to machine a little faster. I'am finnally starting to become effecient at it. This was a HUGE learning curve but it has started to pay off. Pencil and paper is no longer required. The drawing below is the assembly of the supercharger shaft. We now can generate a full set of blueprints from the parts sketches done in the computer and i know the assembly will work because I assembled it in the computer. The computer tells you when you have a dimension that won't line up. Technology sometimes works in my favor.