The vacuum cleaner creates suction by spinning a cast aluminum turbine. The aluminum turbine blades were relatively flat on top, so I decided to make this the centrifuge top. I cut some plywood into a disc with a hole it in to go around the motor output shaft. If the disc ever flew off in operation, someone could get seriously hurt, so I cut some scrap sheet steel into a large washer to go between the end nut of the motor output shaft and the plywood. Once everything was assembled, I tightened the nut until everything was snugly in place.
For being made from a vacuum cleaner, this centrifuge works surprisingly well. I have successfully separated oil from mayonnaise, although mustard does not separate. This centrifuge is extremely useful for settling precipitates out of solutions. If I mix copper sulfate and sodium carbonate solutions, I get clear sodium sulfate in solution and blue copper carbonate precipitate. By placing a sample of solution in the centrifuge, I can settle all the blue precipitate out and see the true color of the solution--it should be clear if I have used enough sodium carbonate. One thing this centrifuge can't do is enrich uranium, but if that's the only complaint, I would say it works pretty well!