The shaft system of ship is the most important part of the power plant, the qualities of shafting alignment have a vital role to ensure the long-term normal vessels. The bearings in ship stern shaft tube are special structure sliding bearings in complex stress states, working in extremely bad lubrication conditions. The bad shafting alignment from shipyard can cause ship stern shaft tube bad fever in the process of driving, bearings in tube damage and huge economic losses, affect the public praise of qualit...