Not to ignore the 'Botters, I posted these pics. on the Vectric forum and thought you folks might enjoy seeing them as well.
This is a bowl I did last month. I used Aspire and really "pushed the envelope" so to speak in several respects. The bowl is approximately 2.625" deep and from the base of the foot to the bowl rim is 3.25". The diameter is 15". The blank is maple face glued in 1.75" strips to create a butcher block blank. Normally, I would have turned this on my lathe but it only has a 12" dia. capacity and my wife wanted a 15" bowl. After some thought, I determined that it should be possible on my Shopbot.
It is machined from both sides. I carved the bowl top first and the last step was to drill two 1/4" holes in the blank on either side of the bowl (0,0 was the center of the blank). Then, I removed the blank from the table and, as the first step to carving the bowl bottom, drilled two 1/4" holes in the spoilboard in the exact same location. That way, I could put two 1/4 dowels in the top of the blank, flip it and line it up perfectly to begin carving the bottom. It's a little scary at first since I was carving blind but as long as my calculations were right, the bowl would be about 1/4" thick when finished. There are also "dog ears" on the blank for bolting the blank to the table.
It took approximately a dozen hours to carve.
Bill
P.S. - I'll post better pics. when I get home.