Thanks for all your great help...and being very informative. The thing is, my project doesnt revolve around the CAD drawing...i just need one to show possible changes that i could make to a design to improve manufacturing time, possibly arrangment (i.e. not having to rotate the subassembly parts to fit other parts - time waste), making similar parts the same (ive noticed that some of the hubs - typically shimano types, have multiple hubs with a few seperate arrangements where several washers and spacers have been use of different sizing....i would aim to try and make them of the same origin such that costs would be minimized in batch production. Also if one washer is bigger and i choose the smaller one...the machining time to produce the hub would be less. Another area possibly might be the thread of the hub axle....minimising that will have a direct affect on the machining time and thus cost of production.
So as you see the project doesnt aim to redesign a hub in reference to tolerances, point stress analysis and other force/material analysis to reproduce a much more efficient hub...but rather understand how to redesign the hub where at a manufacturing level it could be altered significantly to large scale production in the areas of costing, machining time, reduction in component parts, reduction in degrees of complexity - i.e. reduce number of complex components as these will require large machining times etc....
Thus i have no real desire to waste my time drawing up a whole CAD drawing when dimensioning and tolerancing arnt of the projects importance. Ive just realised on the shimano site that the exploded views for their hubs will be satisfactory. Ive noticed that some designs have already incorporated my design characteristics mentioned and thus i shall most probably be able to just show these designs and how the changes that have been "made" will advantageously affect the final manufacturing volumes.
Thanks a heap guys, you have been a great help!