It might be worth looking at Fusion 360. Its free until you earn over £100K per annum from it. Its very powerful and whilst it doenst do 4th axis CAM yet, it is very powerful (for no money).

https://www.youtube.com/watch?v=o-GBpUZ3piY this is worth a look to show the very basics.

In this thread Ive just started, the drawings are renders from within Fusion 360. http://www.mycncuk.com/threads/9283-...4268#post74268