so it should be controlled roundness.

Bearing tolerances choice and control: slide bearing rotation after pressure block is not a sense of flexibility. If significant rotation is not flexible, then the shaft size is too large, and decreased tolerance. Such as bearings pressed into the hand after the obvious "imperfections" in a certain sense the steering shaft, it may be too round shaft or shaft tolerance is not good. A good shaft and bearing tolerances in the control room,
Assembly to prevent foreign bodies: sliding bearings mounted rotor balancing is very susceptible to the iron homeostasis Before installing the bearings, so it is best to do balancing. Bearing in the conference room to put some oil or grease lubrication, but operators often difficult to control the amount of oil or grease the bearings if the plot to stay indoors, it's easy to rotate along the shaft inside the bearing. Bearing chamber is preferably not coated with oil or grease, such as non-coated control, not a conspiracy bearings, stay indoors.
Paint rust prevention: paint rust is featured in a sealed motor, a motor sounds good Roller bearing  but after a period of storage, the motor becomes a very unusual sound, remove the bearing severe rust. Many manufacturers will be considered the front bearing problems, now the main electrical plant has been aware of the problem of varnish. The main problem is that out of the insulating paint volatile acid at a certain temperature, humidity, corrosion and protection of metals, formation of corrosive substances, the channel bearings cause corrosion damage. The only problem now is to choose a good varnish, dry air for some time after assembly.
Sliding bearing life is the manufacture, assembly, use is closely related to every aspect must be made in order to make the best functioning of the state of the bearing, thus extending bearing life.
1, some enterprises in the production process of coating machine bearing no strict rules on cleaning rust rust and seal packaging requirements for the processing of the coating machine bearing parts and assembled the finished coating machine bearings rust treatment . If ferrule turnaround process turnaround time is too long, the outer cylindrical contact with corrosive liquids or gases.