I am a mechanical engineering graduate that's always had an aptitude for drafting. Experienced with AutoCAD I recently started working with PTC Creo (formerly Pro/E). I am adept at drafting in 2D, and while I do have some 3D experience, it does take a bit longer (that extra dimension slows things down just a bit). When working with a drafter it's best to be as detailed as possible. AutoCAD and PTC can make guesses about dimensions based on existing ones, but that's it.
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A basic service would be converting an existing, partial to fully dimensioned blueprint, drawing, or sketch, to an AutoCAD file. Once in AutoCAD it can be drawn to scale, areas can be calculated, and other changes can be made. This is the fastest service, naturally, as it requires very little thought. This is essentially what I did as a drafter for Canadian Fertilizers Ltd.
Advanced 2D services would be jobs such as mapping out land and dividing it evenly with build-able areas at certain distances from property lines and each lot of a minimum area and a road going through it. I had a task like this, it took a while.
Modelling complex shapes in 3D, while not impossible, does take a while. Complex shapes would be anything that is not a derivative of the basic shapes-triangles, squares, circles or combination thereof. A boat, for instance, is a complex shape.
AutoCAD is great for drawing floor plans, and I'm happy to do them. The challenge comes from researching building codes. It's easy enough to draft a 18' x 20' room with a door on one side, but drawing a 18' x 20' room with a door on one side, electrical outlets where they should be, appropriate air vents lighting, wiring, and a window might take a bit longer and require a bit of research.
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