# SPRING

## SPRING

A spring  is defined as an elastic machine element that deflects under the action of the load and returns to its original shape when the load is removed .It can take any shape and form depending upon the application .The important functions and application of the spring are as follow.

1. Springs  are used to absorb shocks and vibration vehicle suspension springs .railway buffer springs in elevators & vibration mounts for machinery .

2. Springs are used to store energy springs used in clocks ,toys , circuit breakers and starters ..

3. Springs are used to apply force & control motion.

### TYPES OF SPRING

1. Helical spring
(a) Compression spring
(b) Extension spring

#### SPRING MATERIAL

The selection of material for the spring wire depends upon following factors .

1. The load acting on the spring.

2. The range of stress through which the spring operates .

3. The limitations on mass & volume of spring.

4. The expected fatigue life .

#### SPRING SPECIFICATION

1. material = oil-hardened and tempered steel wire of grade -VW

2. wire diameter = 3.6mm

3. mean coil diameter = 18mm

4. free length = 125mm

5. total number of turns = 26

6. style of ends = square and ground