Above is a screen-shot of my Rhino view-port (left) and grasshopper canvas (right). The blue geometry in the Rhino view-port is created by a sequence of operations which I defined in grasshopper (which is hidden from view here). As you can see by comparing the images above and below, when changes are made to the parameters they are reflected in the drawing in real time.

This allows for an extremely intuitive and responsive way to isolate design thinking. The beauty in this approach, called Parametric Design, is that once you have done the work to set up a definition, optimization is extremely efficient revision process

Above is the tool-path representation for bottom side of the top of the table. It has a chamfer that was swept around the perimeter, creating a surface.

Here is a representation of the part during the first tool path which is offered in MasterCAM by utilizing the simulate interface.

Typically it's fastest to remove bulk material in one tool path, then refine the surface with a finish pass which is shown above. This simulate interface isn't the best, but it does show an animated visualization of the machining process including any errors that may be present in the file such as tool collisions.

Above is the actual roughing pass. I think this is being cut with a 3/8 inch bit and a 3/16 inch step over

The finish pass reveals a much nicer surface. Next will be the contour pass to remove excess material and create the outline of the table top.

I turned these legs from 8/4 cherry on the lathe by hand.

Using a mark every 4 inches and noting the diameter I was able to make the legs all with the same taper.