If it is then try this and report back the results.
For the mill:
I have a 3/4 inch thick aluminum plate that is 10 inches wide and 25 inches long that I cut on the table saw. I tried to get it as square as possible. Drilled holes are ok on this piece to use t-nuts and studs to clamp it, I only need it squared and with a milled finish all around the outside edge. With the workpiece centered on your mill table and using a 3/4 inch endmill, can you machine it to 9.250 x 24.250 plus or minus .020 in one set up.
For the lathe:
I have a piece of aluminum 3 inches in diameter and 30 inches in length. I'll make it easy on you, one end has a center in it. I want you to hold one end in the chuck and the other end with a live center in the tailstock. Now I want you to take a roughing cut from the tailstock end towards the chuck jaws in one setup. What would be the length of the cut. Can you cut all the way to the chuck jaws in one setup.