In that case you are better off with something like Autodesk Inventor: http://www.autodesk....nventor-professional
You can get it for free with non-commercial educational licence. Pick your country and either IT admin or mentor and you are good to go.
Besides being easy to use you'll also get the benefit of huge toolbox (be sure to check ANSI, ISO and DIN standards), and a suite in which you can make 3D model and then easily translate it into 2D technical drawing.
There are good 2D CAD packages, as I've mentioned before, but I haven't found really good, user friendly, and free 3D CAD package.
The problem with 3D CAD is that it is basically the same set of features regardless of what are you designing. All big 3D CAD software packages haven't really improved on that, but rather by adding new features, fancier GUIs, etc.