Bearings are supports for shafts that provide stability and allow for free and smooth rotation. There are two main types: sliding contact bearings, which have higher friction due to sliding contact between the shaft and bearing; and rolling contact bearings, which use rolling friction between balls or rollers and races, resulting in lower friction. Rolling contact bearings consist of an inner race, outer race, balls or rollers, and a cage or retainer.

1. Bearings and Seals
 Bearings are supports for shafts, providing stability, free and smooth rotation.
 Bearings are broadly classified into two categories: sliding contact bearings and
rolling contact bearings.

2. Sliding Contact Bearing
Sliding contact bearings are those in which the rotating shaft has a sliding contact
with the bearing and the friction is relatively high. Hence, these bearings
require more lubrication

3. Solid Journal Bearing

4. Bush Journal Bearing

5. Pedastal Bearing(Plummer Block)
This bearing is used for long shafts, requiring intermediate support, especially
when the shaft cannot be introduced in the bearing end-wise.

6. Bracket and Hanger Bearing
Brackets and hangers with bearings mounted, are used to support transmission or
line shafts.

7. Thrust Bearing
Thrust bearings are used to support shafts subjected to axial loads.

8. Collar Thrust Bearing
This is generally used for supporting a horizontal shaft under axial load.

9. Rolling Contact Bearing
The bearings, in which a rolling friction is present, are known as rolling contact
bearings. As rolling friction is very much less than sliding friction, rolling contact
bearings are called antifriction bearings.
The bearing consists of four parts: inner race, outer race, balls or rollers and a cage
or Retainer.

12. Assignment-8
Draw the following views of a plumber block, suitable for supporting a shaft of
diameter 50mm:
a) Half section view from the front, with left half in section
b) Sectional view from the side, and
c) View from above