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Designing a Constant Force Spring: A Comprehensive Guide

source:Qianye Precision time:2023-10-21


Constant force springs are mechanical devices that provide a constant amount of force throughout their deflection or extension range. They offer numerous advantages in various applications, including automotive, aerospace, medical devices, and more. This comprehensive guide will provide you with a step-by-step process for designing a constant force spring.

Step 1: Determine the Required Force

The first step in designing a constant force spring is to determine the required force. This will depend on the specific application and the load that needs to be moved or controlled. Consider factors such as weight, distance, and any additional forces or frictions in the system. The required force will help you determine the appropriate dimensions and materials for your spring.

Step 2: Select the Material

Choosing the right material is crucial for the performance and longevity of your constant force spring. Common materials used for constant force springs include stainless steel, carbon steel, and alloys. Consider factors such as corrosion resistance, temperature resistance, and strength requirements when selecting the material. It is also important to ensure that the material has suitable spring properties, such as high elasticity and good fatigue resistance.

Step 3: Calculate the Dimensions

Once you have determined the required force and selected the material, you can proceed to calculate the dimensions of your constant force spring. Several parameters need to be considered, including the width, thickness, and length of the spring. These dimensions will affect the spring’s force output, deflection range, and overall performance. Consult spring design handbooks or use spring design software to calculate the necessary dimensions based on your requirements.

Step 4: Determine the Coiling Method

Constant force springs can be manufactured using different coiling methods, including power winding, clock winding, and strip winding. The choice of coiling method depends on factors such as the spring’s dimensions, material, and production capabilities. Power winding is commonly used for larger springs, while clock winding is suitable for smaller springs with tighter tolerances. Strip winding offers flexibility in producing springs of various shapes and sizes.



Step 5: Design the Attachment Ends

The attachment ends of a constant force spring are crucial for connecting the spring to other components in the system. The design of the attachment ends will depend on the specific application requirements, such as the need for hooks, eyelets, or mounting brackets. Ensure that the attachment ends are strong and secure enough to withstand the forces and movements during operation.

Step 6: Perform Testing and Validation

After designing the constant force spring, it is essential to perform testing and validation to ensure its performance meets the requirements. Conduct load testing to verify the spring’s force output and deflection characteristics. Additionally, test the spring for durability and fatigue resistance by subjecting it to repeated load cycles. Make any necessary adjustments or improvements based on the test results.


Designing a constant force spring requires careful consideration of several factors, including the required force, material selection, dimensions, coiling method, and attachment ends. By following the step-by-step process outlined in this guide, you can design a constant force spring that meets the specific requirements of your application. Remember to test and validate the spring to ensure its performance and durability before integrating it into your system.

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