| Have you ever wondered how cars and other motor | | | | Bearings which allow linear motions are called linear |
| vehicles run smoothly and quietly? As a child, I have | | | | bearings. These bearings allow motion in a straight line. |
| always been in awe of how these powerful machines | | | | An example of linear motion is the pulling and pushing |
| work. Later on, I understood that these machines run | | | | of a drawer. Rotary motions, on the other hand, |
| smoothly with the help of smaller machines called | | | | involve one direction rotation and oscillation, wherein the |
| bearings. Bearings are important to the machines we | | | | motion goes only through a part of a cycle, such as in |
| use everyday, for without them, we would need to | | | | the case of a wheel. Rotary bearings, therefore, allow |
| frequently replace broken machine parts due to the | | | | motions which are concentrated on a center, like a |
| wear and tear of friction.A bearing is a tool used to | | | | wheel on a shaft.Many applications use rotary bearings |
| reduce the friction that occurs in machines. Friction is a | | | | such as machine shafts, vehicle axles, and clock parts. |
| kind of force which opposes the movement of a | | | | The sleeve bearing, a simple cylinder which is inserted |
| surface in sliding or rolling motion over another surface | | | | between the wheel and its axle, is the most basic |
| with which it is in contact. Bearings bear the frictional | | | | rotary bearing. The roller bearing followed, wherein the |
| force which is set up by the moving surface of a | | | | sleeve is replaced by a number of cylindrical rollers, |
| machine part.Bearings are categorized according to | | | | each behaving as a single wheel.The operation of |
| how they operate and the motions that they allow. | | | | bearings includes six common principles. |
| The two common motions are linear and rotary. | | | | |