What is spring index and spring rate?

Spring Index in Compression Springs The spring index is the relationship between the mean diameter and wire diameter. The equation is shown below. This is a very important relationship to consider for manufacturing ease and cost control. As a general rule, the index should be above 3 and less than 20.

What is operating length in spring?

The operating length is the shortest dimension to which the spring is compressed in use. The shut height or solid length is the length of the spring when the spring is loaded such that the coils are actually touching.

What is block length in spring?

Lc (block length): Maximal length of a spring after total blocking. This parameter is shown in the picture on right. Tolerance for this parameter is (+-)15%(indicative). Ln (allowable length): The maximum permitted length of a spring after loading.

What happens if spring index is high?

When the spring index is high (C > 15), it results in large variation in the coil diameter. Such a spring is prone to buckling. A spring index from 4 to 12 is considered best from manufacturing considerations. Therefore, in practical applications, the spring index usually varies from 4 to 12.

How do you measure spring compression?

How to Measure a Compression Spring

  1. Measure the spring wire diameter, preferably to 3 decimal places for accuracy using calipers.
  2. Measure the outside diameter of the coils.
  3. Measure the length in its free condition (uncompressed).
  4. Count the number of coils.
  5. Note the winding direction of the coils.

What is compressed length of spring?

First, you calculate the wire length of one coil (cL) by multiplying the mean diameter by pi (3.14 or π). Then, to calculate the total compression spring wire length (tL), you must multiply the wire length of one coil (cL) by the total amount of coils (N). Coil Wire Length = Mean Diameter x Pi.

What are the 5 types of suspension spring?

Following are the five different types of Suspension springs used in automobile vehicles: Leaf springs. Coil spring….

  • 1.1 Semi-elliptical Springs.
  • 1.2 Quarter-elliptical Spring.
  • 1.3 Three quarter elliptical Spring.
  • 1.4 Transverse Spring.
  • 1.5 Full-elliptical Spring.

Which spring is used in clutch?

Coil clutch springs are compression springs which may be used in different types of clutches. Some are used in clutch dampers to control vibrations and sound. The compression springs are compressed by the radial vibrations of a drifting engine.

What does spring index tell you?

Spring index is the correlation between the mean diameter of a spring and the wire diameter of a spring. This proportion will determine the strength of the spring, the stress induced on the spring, and the manufacturability of the spring.