Precision balancing air shafts that end up on the Boeing 787 is an art. The corrections are made in a milling machine using carbide end mills with very specific corner radii. The part is gripped on one end in an index head and is supported in a lathe steady rest to mill to precision requirements. These parts are extremely delicate and have fragile labyrinth seals that can be destroyed with a very light bump. The value of the shaft as you see here is over $10,000 USD.
A large 16,000 pound impeller for Providence Rhode Island Hurricane Barrier Pump Station is loaded into the 30,000 pound soft bearing balancing machine. This machine is particularly suited for precision balancing large rotors. It can measure unbalance at speeds as low as 80 rpm and as high as 5,000 rpm. The machine supports sit on a bed custom built at HI-TEK Balancing and the stations are Gisholt with our own self aligning bearing blocks designed in house. The balancing electronics are IRD 236. The combined weight of the arbor and rotor is 21,000 pounds.