ABSTRACT
The spindle that carries the rotor and the wharve must be borne on a machine's elements, that is, the bearings. Usually, the rotor's bearings are of the short type. The spindle is supported in its location by two ball bearings; one bearing location is near the backside of the rotor, while the other is fixed behind the wharves. The concept of the air bearing depends on the clearance between the rotor's spindle and the main gland that surrounds the spindle's bearings. The space between the spindle and the gland is filled with a special type of grease as a lubricant, which is paramount to minimizing friction, and it also plays the role of a cooler to a certain extent. The residual static unbalance in the rotor's body after manufacturing, plus the unbalance of the deposited trash and fibers on the collecting surface of the rotor, will lead to the creation of an inertia force when the rotor rotates.
