# Variable pitch spring calculations

• Malaps
In summary, the conversation discusses the calculation of the current spring constant for a variable pitch spring under compression. The stiffness of the spring increases as some of its coils become inactive, causing the spring constant to change. The speaker is looking for an equation to determine the new spring value after it is compressed by a certain distance. They also mention a resource for optimization design and calculation of variable stiffness coil springs for vehicles.
Malaps
Hi,
does anyone know how to calculate the current spring constant of a variable pitch spring when under compression. Since some of its coils get inactive when compressed the stiffness is increasing and consequently “k” is changing as well, is there an equation I can use to calculate the new spring value after the spring is compressed by a distance x?

## 1. What is a variable pitch spring?

A variable pitch spring is a type of spring that has varying spacing between its coils. This design allows for a more gradual change in force as the spring is compressed or extended, making it useful for applications where a constant force is needed.

## 2. How are variable pitch springs calculated?

Variable pitch springs are calculated using a mathematical formula that takes into account the desired force, deflection, and material properties of the spring. This formula, known as Hooke's law, can be used to determine the appropriate wire diameter and number of coils for the spring.

## 3. What factors affect the calculation of a variable pitch spring?

The calculation of a variable pitch spring is affected by several factors, including the desired force, deflection, material properties of the spring, and the space constraints of the application. Other factors such as the type of loading (compression or tension) and the type of ends (closed or open) also play a role in the calculation.

## 4. How accurate are variable pitch spring calculations?

The accuracy of variable pitch spring calculations depends on the accuracy of the input parameters and the assumptions made in the calculation. Generally, the more precise the input data and the more realistic the assumptions, the more accurate the calculation will be.

## 5. Can variable pitch springs be customized for specific applications?

Yes, variable pitch springs can be customized for specific applications by adjusting the input parameters and making appropriate design changes. This allows for the creation of springs that are tailored to meet the specific needs and requirements of a particular application.

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