Ch 15

Bearings guide and position moving parts to reduce friction, vibration, and temperature.

• T

• F

Ball bearings may be integrally machined, one-piece sleeve, or split sleeve.

• T

• F

Babbitt metals are usually the best metals for friction-bearing loads.

• T

• F

More bearings fail because of poor installation practices than from malfunction during their useful life.

• T

• F

Press fit is a method of bearing installation where the diameter of the outer fixed ring is smaller than the diameter of the bearing housing and the ring can be pushed in by hand.

• T

• F

Bearings can be mounted be heating (expanding) or cooling (shrinking) the bearing, depending on the application.

• T

• F

Excessive and frequent lubrication can damage a motor.

• T

• F

Friction bearings never require lubrication.

• T

• F

Oil seals extend the life of a bearing by keeping the oil in the bearing and sealing out foreign matter.

• T

• F

Friction bearings must be harder than the shaft or journal.

• T

• F